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Milou fait un régime
 Guava - Lombok
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@thierryleriche

                       Thierry Leriche-Dessirier
                     Consultant JEE freelance
                     Professeur de Génie Logiciel à l’ESIEA
                     Rédacteur pour Programmez
                     Rédacteur pour Developpez.com
icauda.com
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 Milou est trop lourd (intro)
Agenda

      Lombok (et Lombok-pg) en action

      Tour d’horizon de Guava
Milou est trop lourd (et doit faire un régime)



       I am Milou
5
DOG
      public class Dog {
       private   Integer        id ;
       private   String         name ;
       private   String         fullName ;
       private   SexeEnum       sex ;
       private   Date           birthday ;
       private   String         race ;
       private   Boolean        lof ;
       private   Double         weight ;
       private   Double         size ;
       private   List<String>   colors ;
       ...
   Constructeurs
                  Getters / setters
                  toString ()
                  equals ()
                  hashCode ()
                  compareTo ()


   id
   name
   fullName
   sex
   birthday
   race
   lof
   weight
   size
   Colors
   Constructeurs
                              Getters / setters
                              toString ()
                              equals ()
                              hashCode ()
                              compareTo ()


   id
   name       clic clic
   fullName    démo
   sex
   birthday
   race
   lof
   weight
   size
   Colors
public class Dog
       implements Comparable<Dog> {

 ...

 @Override
 public int compareTo(Dog other) {
   int result = 0;

     result = name.compareTo(other.name);
     if (result != 0) {
       return result;
     }

     ...
 }



             Code très limite… NPE ?...
    Constructeurs
                   Getters / setters
                   toString ()
                   equals ()
                   hashCode ()
                   compareTo ()




                   10 attributs          210 lignes
   id
   name
   fullName
   sex
   birthday
   race
   lof
   weight
   size
   Colors
10 attributs
Java   210 lignes de code
Va chercher Guava 
                                   toString ()
                                   equals ()
                                   hashCode ()
                                   compareTo ()




                      Commons  FAQ 1-2
Base


       Objects
Java 5
     public String toString() {
       return "Dog [id=" + id
         + ", name=" + name
         + ", fullName=" + fullName
                                                                    5
         + ", sex=" + sex
         + ", birthday=" + birthday
         + ", race=" + race
         + ", lof=" + lof
         + ", weight=" + weight
         + ", size=" + size
         + ", colors=" + colors + "]";
     }
                                         Simple, efficace et bien pourri 




             toString ()
Java 5
     public String toString() {
       StringBuilder sb = new StringBuilder();
         sb.append(Dog.class.getSimpleName())
           .append("[id=").append(id)
                                                               5
           .append(", name=").append(name)
           .append(", fullName=").append(fullName)
           ...
           .append(", colors=").append(colors);
         return sb.toString();
     }
                                              Mieux mais sans plus 




               toString ()
Guava
    public String toString() {
      return Objects.toStringHelper(this)
               .add("id", id)
               .add("name", name)
                                            G
               .add("fullName", fullName)
               ...
               .add("colors", colors)
               .toString();
    }
                                            Builder




            toString ()
birthday, fullname, name, race et sex
Java 5
     public boolean equals(Object obj) {
       if (this == obj) return true;
       if (obj == null) return false;
       if (getClass() != obj.getClass()) return false;
                                                                         5
         Dog other = (Dog) obj;
         if (birthday == null) {
           if (other.birthday != null) return false;
         } else if (!birthday.equals(other.birthday)) return false;
         if (fullName == null) {
           if (other.fullName != null) return false;
         ...
         } else if (!race.equals(other.race)) return false;
         if (sex != other.sex) return false;
         return true;
     }

                                                          Carrément illisible 


                equals ()
birthday, fullname, name, race et sex
Guava
    public boolean equals(Object obj) {
      if (!(obj instanceof Dog)) return false;
        Dog other = (Dog) obj;
                                                                  G
        return Objects.equal(birthday, other.birthday)
               && Objects.equal(fullname, other.fullname)
               && Objects.equal(name, other.name)
               && Objects.equal(race, other.race)
               && sex == other.sex;
    }




              equals ()
birthday, fullname, name, race et sex
Java 5
     public int hashCode() {
       final int prime = 31;
       int result = 1;
         result = prime * result
                                                                         5
             + ((birthday == null) ? 0 : birthday.hashCode());
         result = prime * result
             + ((fullName == null) ? 0 : fullName.hashCode());
         result = prime * result
             + ((name == null) ? 0 : name.hashCode());
         result = prime * result
             + ((race == null) ? 0 : race.hashCode());
         result = prime * result
             + ((sex == null) ? 0 : sex.hashCode());
         return result;
     }




                hashCode ()
birthday, fullname, name, race et sex
Guava
    public int hashCode() {



    }
        return Objects.hashCode(birthday, fullName,
                                name, race, sex);
                                                                  G



              hasCode()
name, fullname, birthday, weight, size, race et sex
Java 5
     public int compareTo(Dog other) {
       int result = 0;
         result = name.compareTo(other.name);
         if (result != 0) {
                                                                             5
           return result;
         }
         result = fullname.compareTo(other.fullname);
         if (result != 0) {
           return result;
         }
         ...
     }




                compareTo ()
name.compareTo(other.name)



                 Vsother.name.compareTo(name)




 compareTo ()
name, fullname, birthday, weight, size, race et sex
Guava
    public int compareTo(Dog other) {
      return ComparisonChain.start()
               .compare(name, other.name)
               .compare(fullName, other.fullName)
               .compare(birthday, other.birthday)
                                                                          G
               .compare(weight, other.weight)
               .compare(size, other.size)
               .compare(race, other.race)
               .compare(sex, other.sex)
               .result();
    }




               compareTo ()
Lombok




     en action
Régime


         Annotations de base
Régime    @NoArgsConstructor /
           @RequiredArgsConstructor /
           @AllArgsConstructor  constructeurs
          @Getter / @Setter
          @ToString
          @EqualsAndHashCode
          @Data  @Getter + @Setter + @ToString +
                      @EqualsAndHashCode + @RequiredArgsConstructor
Régime                @NoArgsConstructor /
                       @RequiredArgsConstructor /
                       @AllArgsConstructor
                      @Getter / @Setter
                      @ToString
                      @EqualsAndHashCode
                      @Data
         clic clic
          démo
10 attributs
  Java   210 lignes de code
Lombok   12 lignes + 2-3 @ + compareTo()
Factory
      @RequiredArgsConstructor(staticName = "of")
      public class Dog {
          private Integer id;
          @NonNull private String name; 
                                                         L
          private String fullName;
          @NonNull private SexeEnum sex; 
          private Date birthday;
          ...
                                                    name, sex
      Dog dog = Dog.of("Milou", MALE);
Factory
      @RequiredArgsConstructor(staticName = "of")
      public class Dog {
          private Integer id;
          @NonNull private String name; 
                                                                 L
          private String fullName;
          @NonNull private SexeEnum sex; 
          private Date birthday;
          ...
                                                            name, sex
      Dog dog = Dog.of("Milou", MALE);

      private Dog(@NonNull final String name,
                  @NonNull final SexeEnum sex) {
        if (name == null) throw new NullPointerException("name");
        if (sex == null) throw new NullPointerException("sex");
          this.name = name;
          this.sex = sex;
      }
      public static Dog of(@NonNull final String name,
                           @NonNull final SexeEnum sex) {
        return new Dog(name, sex);
      }
Trucs pratiques


                  Se simplifier la vie
Pratique      @Cleanup
              @Synchronized
              @SneakyThrows
              @Log
              @Delegate

            val
Ressources
         public void lireJava6(String from) {
           InputStream in = null;
           try {
             in = new FileInputStream(from);
             byte[] b = new byte[10000];
                                                5
             while (true) {
               int r = in.read(b);
               if (r == -1)
                  break;
                 ...
             }
           } catch (Exception e) {
             ...
           } finally {
             if (in != null) {
               try {
                  in.close();
               } catch (Exception e) {
                  ...
               }
             }
           ...
Ressources
         public void lire(String from) throws IOException {
             @Cleanup
             InputStream in = new FileInputStream(from);
             byte[] b = new byte[10000];
                                                              L
             while (true) {
               int r = in.read(b);
               if (r == -1)
                 break;
                 ...
             }
         }
Délombok


           Revenir sans la lib
java -jar lombok.jar delombok src -d src-delomboked

Délombok
       <properties>
         <lombok.sourceDirectory>
           ${project.basedir}/src/main/java
         </lombok.sourceDirectory>
       ...
                                                XML
       <build>
         <groupId>org.projectlombok</groupId>
         <artifactId>maven-lombok-plugin</artifactId>
         <executions>
           <execution>
             <phase>generate-sources</phase>
           </execution>
         </executions>
         ...




                    mvn lombok:delombok
Délombok
       @Data
       public class Dog {
                                 5
                                                                        5
         private Integer id;
                                  public class Dog {
         private String name;
                                    private Integer id;
         private String fullName;
                                    private String name;
         private SexeEnum sex;
                                    private String fullName;
         private Date birthday;
                                    ...
         private String race;
                                    private List<String> colors;
         private Boolean lof;
         private Double weight;     public DogLombok() {
         private Double size;       }
         private List<String> colors;
                                    @java.lang.Override
       }
                                    @java.lang.SuppressWarnings("all")
                                    public boolean equals(final java.lang.Obje
                                      if (o == this) return true;
                        mvn           if (o == null) return false;
                  lombok:delombok     if (o.getClass() != this.getClass()) ret
                                      final Dog other = (Dog)o;
                                      if (this.getId() == null ? other.getId()
                                      ...
                                   @java.lang.Override
                                   @java.lang.SuppressWarnings("all")
                                   public int hashCode() {
                                     final int PRIME = 31;
                                     int result = 1;
                                     result = result * PRIME + (this.getId()
Lombok-pg


      Annotations supplémentaires
Annotations Pg
                    @Action                        @Builder
                    @Function                      @LazyGetter
                    @EnumId                        @FluentSetter
                    @Rethrow / @Rethrows           @Predicate
                    @Singleton
                    @AutoGenMethodStub
                    @BoundPropertySupport / @BoundSetter
                    @DoPrivileged
                    @ExtensionMethod
                    @ListenerSupport
                    @WriteLock / @ReadLock
                    @Await / @Signal / @AwaitBeforeAndSignalAfter
                    @Sanitize.Normalize / .With
                    @SwingInvokeLater / @SwingInvokeAndWait
                    @Validate.NotEmpty / .NotNull / .With
                    @VisibleForTesting
Fluent
     @FluentSetter
     @Getter
     public class Dog {
         private Integer id ;
                                                 L
         private String name ;
         private String fullName ;
         ...


     DogLombok dog = new DogLombok();
         dog.name("Milou").sex(MALE);



         println( dog.getName());   //  Milou
         println( dog.getSex());    //  MALE
Builder
      @Builder
      @Getter
      public class Dog {
          private Integer id ;
                                                              L
          private String name ;
          private String fullName ;
          ...


      Dog dog = Dog.dog().name("Milou").sex(MALE).build();


          println( dog.getName());   //  Milou
          println( dog.getSex());    //  MALE
extension
        @ExtensionMethod({ Dog.class, MyDogExtensionClass.class })
        public class DogWithExtension {
            public void foo() {
              Dog milou = new Dog("Milou", 12.5, ...);
                                                                                                     L
              boolean isTooFat = milou.isTooFat();
            }
        }
        class MyDogExtensionClass {
            public static boolean isTooFat(final Dog dog) {
              double imc = dog.getWeight() / pow(dog.getSize(), 2);
              return 25 < imc;
            }
        }




              Avec paramètres  FAQ 9
               http://blog.developpez.com/todaystip/p11165/dev/java/extensionmethod-de-lombok-pg/
Lombok or not Lombok ?


              Avantages et inconvénients
Pro / Cons
                Byte code modifié 
                Version en 0.x
                Documentation des prog ?
                Magique ?



                Compacité
                Lecture simplifiée
                Code normée
                Délombok (pour essayer)
Guava




    tour d’horizon
Factory Methods


              Les choses que j’aime
< new Vs static factories >

Java 5
     List<Integer> primeNumbers = new ArrayList<Integer>();
     Set<String> colors = new TreeSet<String>();
                                                              5
     Map<String, Integer> ages = new HashMap<String, Integer>();
< new Vs static factories >

Java 5  List<Integer> primeNumbers = new ArrayList<Integer>();
        Set<String> colors = new TreeSet<String>();
        Map<String, Integer> ages = new HashMap<String, Integer>();
                                                                              5

                                                                         5
dur dur ?




            Map<String, List<String>> trucs =
                new HashMap<String, List<String>>();
            Map<? extends Person, Map<String, List<String>>> trucs =
                new TreeMap<? extends Person, Map<String, List<String>>>();

            Map<? extends Wrapper<String, Sex, Person>, Map<String,
            List<Set<Adress<String, Integer, Country>>>>> trucs = ...
< new Vs static factories >

Java 5
     List<Integer> primeNumbers = new ArrayList<Integer>();
     Set<String> colors = new TreeSet<String>();
     Map<String, Integer> ages = new HashMap<String, Integer>();
                                                                                5
                                                                                7
Java 7


     List<Integer> primeNumbers = new ArrayList<>();
     Set<String> colors = new TreeSet<>();
     Map<String, Integer> ages = new HashMap<>();
                                                          Qui utilise Java 7 en prod ?
< new Vs static factories >

Java 5
     List<Integer> primeNumbers = new ArrayList<Integer>();
     Set<String> colors = new TreeSet<String>();
     Map<String, Integer> ages = new HashMap<String, Integer>();
                                                                                  5
                                                                                  7
Java 7


     List<Integer> primeNumbers = new ArrayList<>();
     Set<String> colors = new TreeSet<>();
     Map<String, Integer> ages = new HashMap<>();
                                                              Qui utilise Java 7 en prod ?



                                                                                  G
Guava




         List<Integer> primeNumbers = newArrayList();
         Set<String> colors = newTreeSet();
         Map<String, Integer> ages = newHashMap();
                                                                        Dès maintenant !
< new Vs static factories >

Java 5
     List<Integer> primeNumbers = new ArrayList<Integer>();
     Set<String> colors = new TreeSet<String>();
     Map<String, Integer> ages = new HashMap<String, Integer>();
                                                                                   5
                                                                                   7
Java 7


     List<Integer> primeNumbers = new ArrayList<>();
     Set<String> colors = new TreeSet<>();
     Map<String, Integer> ages = new HashMap<>();
                                                               Qui utilise Java 7 en prod ?



                                                                                   G
Guava




         List<Integer> primeNumbers = newArrayList();
         Set<String> colors = newTreeSet();
         Map<String, Integer> ages = newHashMap();
                                                                         Dès maintenant !
                  Lombok




                       var primeNumbers = new ArrayList<Integer>();
                       -> primeNumbers.size();
                          ...
                                                                                  L
< new Vs static factories >




                                                                             G
List of dogs   List<Dog> dogs = newArrayList(
                 new Dog("Milou", 12.5, MALE, ...),
                new Dog("Rintintin", 45.0, MALE, ...),
                new Dog("Volt", 10.3, MALE, ...),
                new Dog("Lassie", 45.0, FEMALE, ...),
                new Dog("Pluto", 22.0, MALE, ...),
                new Dog("Medor", 35.6, MALE, ...));



                                                                [Milou,
                                                                Rintintin,
                                                                Volt,
                                                                Lassie,
                                                                Pluto,
                                                                Medor]
Immutables


        Pour que ça ne change pas
immutable
Quand ?
immutable
                 Quand ?           mutable



On se demande souvent si une liste doit être immutable mais
c’est prendre le problème dans le mauvais sens. La plupart du
temps, ce qu’il faut vraiment se demander, c’est si la liste a
besoin d’être mutable.
< unmodifiables Vs immutables >

Java 5
     Set<Integer> temp =
        new LinkedHashSet<Integer>(Arrays.asList(1, 2, 3, 5, 7));
     Set<Integer> primes = Collections.unmodifiableSet(temp);
< unmodifiables Vs immutables >

Java 5
     Set<Integer> temp =
        new LinkedHashSet<Integer>(Arrays.asList(1, 2, 3, 5, 7));
     Set<Integer> primes = Collections.unmodifiableSet(temp);




                                                                 G
Guava




         Set<Integer> primes = ImmutableSet.of(1, 2, 3, 5, 7);
< unmodifiables Vs immutables >

Of
 ImmutableSet.of(E
 ImmutableSet.of(E
 ImmutableSet.of(E
 ImmutableSet.of(E
 ImmutableSet.of(E
                                e1)
                                e1,
                                e1,
                                e1,
                                e1,
                                       E
                                       E
                                       E
                                       E
                                           e2)
                                           e2,
                                           e2,
                                           e2,
                                                 E
                                                 E
                                                 E
                                                     e3)
                                                     e3, E e4)
                                                     e3, E e4, E e5)
                                                                                         G
 ImmutableSet.of(E              e1,    E   e2,   E   e3, E e4, E e5, E e6, E...)
                                                                            Ne prend pas de null
Of




     ImmutableSet.of()

                                                                                           Vide




          Map et List  FAQ 4

           http://blog.developpez.com/guava/p10589/collection/title-212/
< Copie de défense >
Java 5   public class Dog {
          private String name;
          ...
          private List<String> colors;
                                                               5
          public Dog(String name, List<String> colors) {
            this.name = name;
            ...
            this.colors = Collections.unmodifiableList(
                             new ArrayList<String>(colors));
          }
          public List<String> getColors() {
            return colors;
          }
< Copie de défense >
Guava   public class Dog {
         private String name;
         ...
         private ImmutableList<String> colors;
                                                           G
         public Dog(String name, List<String> colors) {
           this.name = name;
           ...
           this.colors = ImmutableList.copyOf(colors);
         }
         public ImmutableList<String> getColors() {
           return colors;
         }




                             Message clair
Collections en plus


              Multimap, Bipap, Multiset
< Multi Map >

Java 5
     Map<String, List<String>> dogFavoriteColors =
       new HashMap<String, List<String>>();
                                                             5
     }
       milouColors = new ArrayList<String>();
       dogFavoriteColors.put("Milou",milouColors);
                                                             5
     List<String> milouColors = dogFavoriteColors.get("Milou");
     if(milouColors == null) {



     milouColors.add("Vert");
< Multi Map >

Java 5
     Map<String, List<String>> dogFavoriteColors =
       new HashMap<String, List<String>>();
                                                             5
     }
       milouColors = new ArrayList<String>();
       dogFavoriteColors.put("Milou",milouColors);
                                                             5
     List<String> milouColors = dogFavoriteColors.get("Milou");
     if(milouColors == null) {



     milouColors.add("Vert");




                                                            G
Guava




         Multimap<String, String> dogFavoriteColors =
           HashMultimap.create();
         dogFvoriteColors2.put("Milou", "Jaune");
         dogFavoriteColors2.put("Milou", "Rouge");
< Bi Map >



                                                                             G
Guava
    BiMap<String, Dog> tatouages = HashBiMap.create();
    tatouages.put("ABC123", new Dog("Milou") );
    tatouages.put("MBD324", new Dog("Volt") );
    tatouages.put("JFT672", new Dog("Lassie") );

    println( tatouages );
                                                 {ABC123=Milou,
                                                 MBD324=Volt,

         ABC123=Milou
    println( tatouages.inverse() );
         Une map bijective
                                                 JFT672=Lassie}

                                                 {Milou=ABC123,

         MDB324=Volt
                                                 Volt=MBD324,
                                                 Lassie=JFT672}



         JFT672=Lassie
         Il est possible de changer la valeur associée à une clé mais pas
         d'avoir deux clés avec la même valeur (IllegalArgumentException).
< Multi Set >


Guava
                                                              G
        Multiset<Integer> ages = HashMultiset.create();
        ages.add(2);
        ages.add(3);
        ages.add(7);
        ages.add(11);
        ages.add(3);
        ages.add(5);
        println( ages );
                                       [2, 3 x 2, 5, 7, 11]


        println( ages.count(3) )

                                       2
Base


Préconditions, joiner, splitter, optional
   toString ()
   equals ()
   hashCode ()
   compareTo ()
< Preconditions >


DOG
      public class Dog {
       private Integer
       private String
       private String
                           id ;
                           name ;
                           fullName ;
                                                         5
       ...

       public Dog(String name, String fullName, ...) {
         if(name == null) {
           throw new NPE("Le nom bla bla");
         }
         if(fullName == null) {
           throw new NPE("bla bla");
         }
         ...
           this.name = name;
           this.fullName = fullName;
           ...
       }
< Preconditions >


DOG                                                           G
      import static com.google.common.base.Preconditions.*;

      public class Dog {
        private Integer        id ;
        private String         name ;
        private String         fullName ;
        ...

        public Dog(String name, String fullName, ...) {
            this.name = checkNotNull(name, "bla bla");
            this.fullName = checkNotNull(fullName, "bla bla");
            ...
        }




         checkNotNull()  NPE
         checkArgument()  IAE
         checkState()     ISE
Joiner
     String names = Joiner.on(", ")
       .join(newArrayList("Lassie", "Volt", "Milou"));

                                           "Lassie, Volt, Milou"
                                                                           G
                                                                   Java classique
          List<String> dogNames = newArrayList("Lassie", "Volt", "Milou");
          StringBuilder sb = new StringBuilder();
          boolean first = true;
          for (String name : dogNames) {
            if(name != null || name.trim().isEmpty()) {
              continue;
            }
            if (!first) {
              sb.append(", ");
            }
              sb.append(name);
              first = false;
          }
          String names = sb.toString();
Joiner
     String names = Joiner.on(", ")
       .join(newArrayList("Lassie", "Volt", "Milou"));

                                        "Lassie, Volt, Milou"
                                                                G
         String names = Joiner.on(", ")
           .join(newArrayList("Lassie", "Volt", null, "Milou"));

                                         NPE 
Joiner
     String names = Joiner.on(", ")
       .join(newArrayList("Lassie", "Volt", "Milou"));

                                        "Lassie, Volt, Milou"
                                                                G
         String names = Joiner.on(", ")
           .join(newArrayList("Lassie", "Volt", null, "Milou"));

                                         NPE 
     String names = Joiner.on(", ")
       .skipNulls()
       .join(newArrayList("Lassie", "Volt", null, "Milou"));

                                        "Lassie, Volt, Milou"
                                                                G
Joiner
     String names = Joiner.on(", ")
       .join(newArrayList("Lassie", "Volt", "Milou"));

                                                            "Lassie, Volt, Milou"
                                                                                               G
         String names = Joiner.on(", ")
           .join(newArrayList("Lassie", "Volt", null, "Milou"));

                                                             NPE 
     String names = Joiner.on(", ")
       .skipNulls()
       .join(newArrayList("Lassie", "Volt", null, "Milou"));

                                                            "Lassie, Volt, Milou"
                                                                                               G
                                                                                               G
     String names = Joiner.on(", ")
       .useForNull("Anonymous"))
       .join(newArrayList("Lassie", "Volt", null, "Milou"));

                                                            "Lassie, Volt, Anonymous, Milou"


              http://blog.developpez.com/guava/p11054/base/joiner-pour-assembler-des-items/
Splitter
       Iterable<String> dogNames =
         Splitter.on(",")                         [ "Lassie",
                 .split("Lassie, Volt, Milou");     "Volt",
                                                    "Milou" ]
Splitter
       Iterable<String> dogNames =
         Splitter.on(",")                              [ "Lassie",
                 .split("Lassie, Volt, Milou");          "Volt",
                                                         "Milou" ]
           Iterable<String> dogNames =
             Splitter.on(",")                        [ "Lassie",
                     .split("Lassie, Volt, ,Milou"); "Volt",
                                                        " ",
                                                        "Milou" ]
Splitter
       Iterable<String> dogNames =
         Splitter.on(",")                              [ "Lassie",
                 .split("Lassie, Volt, Milou");          "Volt",
                                                         "Milou" ]
           Iterable<String> dogNames =
             Splitter.on(",")                        [ "Lassie",
                     .split("Lassie, Volt, ,Milou"); "Volt",
                                                        " ",
                                                        "Milou" ]
       Iterable<String> dogNames =
         Splitter.on(",")                        [ "Lassie",
                 .trimResults()                    "Volt",
                 .split("Lassie, Volt, ,Milou"); "",
                                                        "Milou" ]
Splitter
       Iterable<String> dogNames =
         Splitter.on(",")                                                       [ "Lassie",
                 .split("Lassie, Volt, Milou");                                   "Volt",
                                                                                  "Milou" ]
           Iterable<String> dogNames =
             Splitter.on(",")                        [ "Lassie",
                     .split("Lassie, Volt, ,Milou"); "Volt",
                                                                                  " ",
                                                                                  "Milou" ]
       Iterable<String> dogNames =
         Splitter.on(",")                        [ "Lassie",
                 .trimResults()                    "Volt",
                 .split("Lassie, Volt, ,Milou"); "",
                                                                                  "Milou" ]
       Iterable<String> dogNames =
         Splitter.on(",")
                 .trimResults()
                 .omitEmptyStrings()             [ "Lassie",
                 .split("Lassie, Volt, ,Milou"); "Volt",
                                                                                  "Milou" ]
                                                                                                       G
                http://blog.developpez.com/guava/p11045/annotation/splitter-pour-separer-des-items/
Wrapper Optional <T>

Optional
           Dog dog = new Dog("Milou", ...);
           Optional<Dog> opt = Optional.of(dog);
           assertTrue( opt.isPresent() );
           assertEquals( "Milou", opt.get().getName() );
Wrapper Optional <T>

Optional
           Dog dog = new Dog("Milou", ...);
           Optional<Dog> opt = Optional.of(dog);
           assertTrue( opt.isPresent() );
           assertEquals( "Milou", opt.get().getName() );


           Optional<Dog> opt = Optional.absent();
           assertFalse( opt.isPresent() );
           opt.get();  ISE
Wrapper Optional <T>

Optional
           Dog dog = new Dog("Milou", ...);
           Optional<Dog> opt = Optional.of(dog);
           assertTrue( opt.isPresent() );
           assertEquals( "Milou", opt.get().getName() );


           Optional<Dog> opt = Optional.absent();
           assertFalse( opt.isPresent() );
           opt.get();  ISE


           Dog dog = null;
           Optional<Dog> opt = Optional.of(dog);  NPE
           Optional<Dog> opt = Optional.fromNullable(dog);
Wrapper Optional <T>

Optional
           Dog dog = new Dog("Milou", ...);
           Optional<Dog> opt = Optional.of(dog);
           assertTrue( opt.isPresent() );
           assertEquals( "Milou", opt.get().getName() );


           Optional<Dog> opt = Optional.absent();
           assertFalse( opt.isPresent() );
           opt.get();  ISE


           Dog dog = null;
           Optional<Dog> opt = Optional.of(dog);  NPE
           Optional<Dog> opt = Optional.fromNullable(dog);


           Dog dog = null;
           Optional<Dog> opt = Optional.fromNullable(dog);
           Dog dog2 = opt.or( new Dog("noname", ...) );
           assertEquals( "noname", dog2.getName() );

                http://blog.developpez.com/guava/p11163/base/le-wrapper-optional-de-guava/
Functional Programming


                         todo
Super chien




Dog
Super Chien
              public class SuperChien implements SuperHero {
               private
               private
               private
                         String
                         double
                         Set<String>
                                          surnom ;
                                          poids ;
                                          couleursCostume ;
                                                                                  5
               private   Set<String>      pouvoirs ;
               ...

                                   Les héros peuvent avoir plusieurs costumes donc je
                                n’utilise pas un ImmutableSet. Idem pour les pouvoirs
                                               dont la liste augmente avec l’expérience.
< Transformation >

Transformation
             List<SuperChien> superChiens =
               Lists.transform(dogs,

                 @Override
                               new Function<Dog, SuperChien>() {

                 public SuperChien apply(Dog dog) {
                                                                             G
                   SuperChien chien = new SuperChien();
                       chien.setSurnom("Super " + dog.getName());
                       chien.setPoids(dog.getWeight());
                       chien.setCouleursCostume(newHashSet(dog.getColors()))
                       chien.setPouvoirs(newHashSet("Code en Java", "Vole"))
                       ...
                       return chien;
                   }
             });
                                                               [Super Milou,
                                                               Super Rintintin,
                                                               Super Volt,
                                                               Super Lassie,
                                                               Super Pluto,
                                                               Super Medor]
< Transformation >

Transformation
                                                                         G
             List<SuperChien> superChiens =
               Lists.transform(dogs, new Function<Dog, SuperChien>() {
                 @Override
                 public SuperChien apply(Dog dog) {
                   SuperChien chien = new SuperChien();
                   ...
                   return chien;
                 }
             });

                           Vue (lazy)
                           size / isEmpty dispo 
                           Pas pour traitements répétés   FAQ 3


             List<SuperChien> chiens = newArrayList(Lists.transform(...


             ImmutableList<SuperChien> chiens =
                          ImmutableList.copyOf(Lists.transform(...
< Filtre >

Filtre
     Predicate<Dog> malePredicate =
       new Predicate<Dog>() {
         public boolean apply(Dog dog) {

         }
           return dog.getSex() == MALE;
                                                             G
       }


     Iterable<Dog> maleDogs =
       Iterables.filter(dogs, malePredicate);
                                                [Milou,
                                                Rintintin,
                                                             G
                                                Volt,
                                                Pluto,
                                                Medor]
< Filtre >

Filtre
     Predicate<Dog> malePredicate =
       new Predicate<Dog>() {
         public boolean apply(Dog dog) {

         }
           return dog.getSex() == MALE;
                                                [Milou,
                                                             G
       }                                        Rintintin,
                                                Volt,
     Iterable<Dog> maleDogs =
       Iterables.filter(dogs, malePredicate);
                                                Pluto,
                                                Medor]       G
     Dog firstMaleDog =
       Iterables.find(dogs, malePredicate);
                                                Milou        G
< Filtre >

Filtre
     Predicate<Dog> malePredicate =
       new Predicate<Dog>() {
         public boolean apply(Dog dog) {

         }
           return dog.getSex() == MALE;
                                                [Milou,
                                                              G
       }                                        Rintintin,
                                                Volt,
     Iterable<Dog> maleDogs =
       Iterables.filter(dogs, malePredicate);
                                                Pluto,
                                                Medor]        G
     Dog firstMaleDog =
       Iterables.find(dogs, malePredicate);
                                                Milou         G
     Dog firstMaleDog =
       Iterables.find(femaleDogs, malePredicate, DEFAULT_DOG );

                                                Default dog
G
Seconde liste   List<Dog> dogs2 = newArrayList(
                  new Dog("Rintintin", 45.0, MALE, ...),
                 new Dog("Pluto", 22.0, MALE, ...),
                 new Dog("Lulu", 35.6, MALE, ...));




                      [Rintintin,         [Milou,
                      Pluto,              Rintintin,
                      Lulu]               Volt,
                      Liste 2 : dogs2     Lassie,
                                          Pluto,
                                          Medor]
                                          Liste 1 : dogs
< Fluent or not fluent ? >

Pas fluent
         Predicate<Dog> malePredicate =
           new Predicate<Dog>() {
             public boolean apply(Dog dog) {
               return dog.getSex() == MALE;
             }};
                                                                      G
         Function<FullDog, String> nameFunction =
           new Function<FullDog, String>() {
             public String apply(FullDog dog) {
               return dog.getName();
             }};
                                                                      G
                                                                      G
         Iterable<FullDog> maleDogs =
           Iterables.filter(dogs, malePredicate);
         Iterable<String> maleNames =
           Iterables.transform(maleDogs, nameFunction);
                                                              [Milou,
                                                              Rintintin,
                                                              Volt,
                                                              Pluto,
                                                              Medor]
< Fluent or not fluent ? >

Pas fluent
         Iterable<FullDog> maleDogs =
           Iterables.filter(dogs, malePredicate);
         Iterable<String> maleNames =
           Iterables.transform(maleDogs, nameFunction);
                                                                                                G
                                                                                                G
Fluent



         List<String> maleNames2 =
           FluentIterable.from(dogs)
             .filter(malePredicate)
             .transform(nameFunction)
             .toImmutableList();
                                                                                             Guava 12.0



                                                                                        [Milou,
                                                                                        Rintintin,
                                                                                        Volt,
                                                                                        Pluto,
              http://blog.developpez.com/guava/p11092/annotation/fluentiterable-sur-   Medor]
             mon-chien-guava/
Cache


        todo
< Memoization >

Web Service
          public class DogService {
              @Inject
              private PetShopWebService service;
              public Integer getNumberDogsSoldYesterday() {
                                                              5
                return service.checkSales( "dog" );
              }
< Memoization >

Web Service
           public class DogService {
               @Inject
               private PetShopWebService service;
               public Integer getNumberDogsSoldYesterday() {
                                                                        5
                 return service.checkSales( "dog" );
               }




                                                                        5
Cache manuel




               private Integer nbOfDogsSold;
               public Integer getNumberDogsSoldYesterday() {
                 if (nbOfDogsSold == null) {
                   nbOfDogsSold = service.checkSales( "dog" );
                 }
                 return nbOfDogsSold;
               }
                                                           Double check null…
< Memoization >

Guava
    public class DogService {
        @Inject
        private PetShopWebService service;
        private Supplier<Integer> nbOfDogsSoldSupplier =
                                                           G
          Suppliers.memoize(
            new Supplier<Integer>() {
              public Integer get() {
                return service.checkSales( "dog" );
              }
            });
        public Integer getNumberDogsSoldYesterday() {
          return nbOfDogsSoldSupplier.get();
        }
< Memoization >

Guava
    public class DogService {
        @Inject
        private PetShopWebService service;
        private Supplier<Integer> nbOfDogsSoldSupplier =
                                                           G
          Suppliers.memoizeWithExpiration(
            new Supplier<Integer>() {
              public Integer get() {
                return service.checkSales( "dog" );
              }
            }, 1, TimeUnit.DAYS );
        public Integer getNumberDogsSoldYesterday() {
          return nbOfDogsSoldSupplier.get();
        }
< Cache >

Web Service
          public class DogService {
              @Inject
              private PetShopWebService service;
              private Map<String, Dog> dogMap = Maps.newHashMap();
                                                                        5
              public Integer getDog(String name) {
                Dog dog = dogMap.get(name);
                if(dog == null) {
                  dog = service.getAnimal( "dog", name ); // type-name
                  dogMap.put( name, dog );
                }
                return dog;
              }
                                                       Quid du timeout ? Max ?
< Cache >

Guava
    public class DogService {
        @Inject
        private PetShopWebService service;
        private LoadingCache<String, Dog> dogCache =
                                                            G
          CacheBuilder.newBuilder()
                      .maximumSize(2000)
                      .expireAfterWrite(30, TimeUnit.MINUTES)
                      .build(new CacheLoader<String, Dog>() {
            public Dog load(String key) {
              return service.getAnimal( "dog", key );
            }
          });
        public Integer getDog(String name) {
          return dogCache.get( name ); // + try-catch
        }
Hash


       Fantôme
Hash
   HashFunction hf = Hashing.md5();
   HashCode hc = hf.newHasher()
                   .putInt(123)
                   .putString("Milou")
                                         G
                   .hash();
   byte[] bytes = hc.asBytes();

          md5
          Murmur3 128 bits
          Murmur3 32 bits
          Sha1
          Sha256
          Sha512
          goodFastHash
< Is in list ? >

Préparation
           int NB_OF_DOGS = 100000;
           List<Dog> dogs = newArrayList();
           Random rand = new Random();
           for (int i = 0; i < NB_OF_DOGS; i++) {
                                                                    5
             Dog dog = new Dog();
             dog.setName("abc" + rand.nextInt(999));
             ...
             dogs.add(dog);
           }




                                                                    5
contains




           final Dog milou = new Dog();
           milou.setName("Milou");
           ...
           boolean isInList = dogs.contains(milou);
                                                         false (14 ms)

           dogs.add(milou);
           boolean isInList = dogs.contains(milou);
                                                         true (14 ms)
< Is in list ? >

Bloom filter
           Funnel<Dog> dogFunnel = new Funnel<Dog>() {
             public void funnel(Dogdog, PrimitiveSink sink) {
               sink.putString(dog.getName())
                   .putString(dog.getFullName())
                   .putString(dog.getRace());
                                                                                                G
             }};
           BloomFilter<Dog> bloom =
             BloomFilter.create(dogFunnel, NB_OF_DOGS, 0.01);
           for (int i = 0; i < NB_OF_DOGS; i++) {
             ...
             bloom.put(dog);

           boolean isInList = bloom.mightContain(milou);
                                                                                      false (0 ms)
           bloom.put(milou);
           boolean isInList = bloom.mightContain(milou);
               Guava 13
                                                                                      true (0 ms)


                http://blog.developpez.com/guava/p11149/collection/bloom-filter-de-guava-13/
Guava or not Guava ?


             Avantages et inconvénients
Pro / Cons
              Ne pas en abuser…



              Utile
              Bonnes pratiques
LIENS
        @thierryleriche
Guava
 http://code.google.com/p/guava-libraries



Lombok
 http://projectlombok.org

Lombok-pg
 https://github.com/peichhorn/lombok-pg
ICAUDA
 http://icauda.com
 http://icauda.com/articles.html           (articles)
 http://icauda.com/cours.html              (slides)


Blog Guava
 http://blog.developpez.com/guava

« Simplifier le code de vos beans Java à l'aide
de Commons Lang, Guava et Lombok »
 http://thierry-leriche-dessirier.developpez.com/tutoriels/
     java/simplifier-code-guava-lombok      (article)
MERCI
1. Guava Vs Commons



FAQ / Bonus
              2. Régime façon Apache
              3. Fonctionnal prog Vs boucle for
              4. Créer des Maps
              5. Charsets
              6. Converter Spring
              7. Orderings
              8. Licences
              9. Extension avec valeurs
              10. Chrono
              11. CharMatcher
              12. Impl
              13. And, or, in…
              14. Partition, limit
Guava Vs Commons ?




    http://tinyurl.com/guava-vs-apache




1
Régime : la méthode Commons ?

                                                            L
toString   public String toString() {
               return new ToStringBuilder(this)
                            .append("id", id)
                            .append("name", name)
                            .append("fullName", fullName)
                            ...
                            .append("colors", colors)
                            .toString();
           }




2
Régime : la méthode Commons ?

                                                              L
equals   public boolean equals(Object obj) {
           if (this == obj) return true;
           if (obj == null) return false;
           if (!(obj instanceof Dog)) return false;
             Dog other = (Dog) obj;
             return new EqualsBuilder()
                          .append(birthday, other.birthday)
                          .append(fullname, other.fullname)
                          .append(name, other.name)
                          .append(race, other.race)
                          .append(sex, other.sex)
                          .isEquals();
         }


2
Régime : la méthode Commons ?

                                                     L
hashCode   public int hashCode() {
               return new HashCodeBuilder(17, 37)
                            .append(birthday)
                            .append(fullname)
                            .append(name)
                            .append(race)
                            .append(sex)
                            .toHashCode();
           }




2
Régime : la méthode Commons ?

                                                                 L
compareTo   public int compareTo(Dog other) {
                return new CompareToBuilder()
                             .append(name, other.name)
                             .append(fullname, other.fullname)
                             .append(birthday, other.birthday)
                             ...
                             .append(sex, other.sex)
                             .toComparison();
            }




2
Fonctionnal prog Vs boucle for : quand ?
Transformation
             List<SuperChien> superChiens = newArrayList(
               Lists.transform(dogs, new Function<Dog, SuperChien>() {
                 @Override
                 public SuperChien apply(Dog dog) {
                   SuperChien chien = new SuperChien();
                   ...


             }));
                 }
                   return chien;

                                                                                     G
                                           Vs
                      List<SuperChien> superChiens = newArrayList();


 3                    for(Dog dog : dogs) {
                        SuperChien chien = new SuperChien();


                      }
                        ...
                        superChiens.add(chien);
                                                                                     G
                 http://code.google.com/p/guava-libraries/wiki/FunctionalExplained
Créer des Maps
          public static final ImmutableMap<String, Integer>
of
            AGES = ImmutableMap.of("Milou", 32,


                                                          G
                              "Volt", 7,
                              "Pluto", 37,
                              "Lassie", 17);

          public static final ImmutableMap<String, Integer>
Builder




            AGES = new ImmutableMap.Builder<String, Integer>()
                    .put("Milou", 32)
                    .put("Volt", 7)
                    .put("Pluto", 37)
                    .put("Lassie", 17)


4
                    .put("Medor", 5)
                    .put("Croquette", 8)


                                                          G
                    .put("Loulou", 2)
                    ...
                    .build();
Charsets
Java 5   String name = "Milou";
         try {
           byte[] bytes = name.getBytes("UTF-8");
         } catch (UnsupportedEncodingException e) {
                                                                  5
           throw new AssertionError(e);
         }
                                   Ca n’arrive jamais cette exception 



                                                                G
Guava




         String name = "Milou";
         byte[] bytes = name.getBytes(Charsets.UTF_8);



5
Converter Spring

                                                            G
    import org.springframework...Converter;
    @Component("dogToChienConverter")
    public class DogToChienConverter
                     implements Converter<List<Dog>,
                                          List<SuperChien>> {
      public List<SuperChien> convert(List<Dog> dogs) {
        List<SuperChien> chiens = newArrayList(transform(dogs,
          new Function<Dog, SuperChien>() {
            public SuperChien apply(Dog dog) {
              ...
              return chien;
            }
        }));
        return chiens;


6     }
                                                 Lazy or not lazy ?
Orderings




7
Licences

     Lombok :      MIT License
     Lombok-pg :   MIT License

     Guava :       Apache License 2.0

     Commons :     Apache License 2.0




8
Extension avec valeurs

                                                                    L
@ExtensionMethod({ Object.class, MyOtherClass.class })
public class DogWithExtension {
    public void foo() {
      String s1 = "toto";
      s1.print();                     //  toto
        String s2 = null;
        s2.print();                   //  null
    }
}
class MyOtherClass {
  public static <T> void print(final T value) {
    System.out.println(value);
  }


9
}




        On peut mettre autre chose qu’un "Object", par exemple un
        "Arrays" , un "Dog" , etc.
Extension avec valeurs
    @ExtensionMethod({ Object.class, MyOtherClass.class })
    public class DogWithExtension {
        public void foo() {
          String s1 = "toto";
                                                                 L
          s1.print();           //  toto
            String s2 = null;
            s2.print();         //  null
            s2.print("vide");   //  vide
        }
    }
    class MyOtherClass {
      public static <T> void print(final T value) {
        System.out.println(value);



9
      }

        public static void print(String value, String other) {
          if (value == null || value.isEmpty()) {
            System.out.println(other);
          } else {
            System.out.println(value);
          }
< Chrono >
           long start = new Date().getTime();


 Guava Java 5
           foo(); // traitement long (ou pas)
           long end = new Date().getTime();
                                                                                    5
           long duration = end - start; // 11 ms



           Stopwatch sw = new Stopwatch();
           sw.start();
           foo();
           sw.stop();
                                                                                    G
           long duration = sw.elapsedMillis(); // 11 ms




10
           long nano = sw.elapsedTime(NANOSECONDS); // 11179739 ns
           long micro = sw.elapsedTime(MICROSECONDS); // 11179 us
           long millis = sw.elapsedTime(MILLISECONDS); // 11 ms




            http://blog.developpez.com/guava/p11160/base/le-stop-watch-de-guava/
CharMatcher




11
Impl
 public class Dog implements Comparable<Dog> {
  private Integer id ;
  private String name ;
  private String fullName ;
                                                            5
  ...
  @Override
  public int compareTo(Dog dog) {
    return ...;
  }

                                     implements List ? aie aie aie


12
Impl
 @AutoGenMethodStub
 public class Dog implements Comparable<Dog> {
  private Integer id ;
  private String name ;
                                                 L
  private String fullName ;
  ...




12
And, or, in…
And, or, in...
                                                                                                          G
                 import static com.google.common.base.Predicates.and;
                 import static com.google.common.base.Predicates.in;

                 boolean isRintintinInBoth =
                   and( in(dogs), in(dogs2) )
                     .apply(new Dog("Rintintin"));
                                                                                                  true



                                                                                                          G
                 import static com.google.common.base.Predicates.or;

                 boolean isTintinInOne =
                   or( in(dogs), in(dogs2) )
                     .apply(new Dog("Tintin");
                                                                                                  false


13                                            [Milou,
                                              Rintintin,
                                                                  Liste 2 : dogs2
                             Liste 1 : dogs




                                              Volt,
                                              Lassie,                               [Rintintin,
                                              Pluto,                                Pluto,
                                              Medor]                                Lulu]
Partition, limit
Partition   List<List<FullDog>> partition =
              Lists.partition(dogs, 4);

                                [Milou,           [Pluto,
                                                               G
                                Rintintin,        Medor]
                                Volt,
                                Lassie]



                                                               G
Limit




            List<FullDog> first4Dogs =
              newArrayList(Iterables.limit(dogs, 4));

                                                  [Milou,

14                                                Rintintin,
                                                  Volt,
                                                  Lassie]
Slides en préparation
I/O


      todo
< I/O >




Ressources
         public void lireJava6(String from) {
           InputStream in = null;
           try {
             in = new FileInputStream(from);
             byte[] b = new byte[10000];
                                                5
             while (true) {
               int r = in.read(b);
               if (r == -1)
                  break;
                 ...
             }
           } catch (Exception e) {
             ...
           } finally {
             if (in != null) {
               try {
                  in.close();
               } catch (Exception e) {
                  ...
               }
             }
           ...
< I/O >




Java 7
     public void lireJava7(String from) {
       try(InputStream in = new FileInputStream(from)) {
         ...
         while (true) {
           ...
                                                           7
         }
       }
     }
< I/O >




Guava
    Todo

                     G
Concurrent / future


                      todo
Todo

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201209 Lombok & Guava

  • 1. Milou fait un régime Guava - Lombok
  • 3. @thierryleriche Thierry Leriche-Dessirier  Consultant JEE freelance  Professeur de Génie Logiciel à l’ESIEA  Rédacteur pour Programmez  Rédacteur pour Developpez.com icauda.com
  • 4. Cours Forums FAQ News Interviews Critiques Articles / tutoriels Agendas Magazine
  • 5. 13 OOO OOO pages vues par mois 5 500 000 visites par mois 2 500 000 visites uniques par mois 5 000 messages forum par jour
  • 6.  Milou est trop lourd (intro) Agenda  Lombok (et Lombok-pg) en action  Tour d’horizon de Guava
  • 7. Milou est trop lourd (et doit faire un régime) I am Milou
  • 8. 5 DOG public class Dog { private Integer id ; private String name ; private String fullName ; private SexeEnum sex ; private Date birthday ; private String race ; private Boolean lof ; private Double weight ; private Double size ; private List<String> colors ; ...
  • 9. Constructeurs  Getters / setters  toString ()  equals ()  hashCode ()  compareTo ()  id  name  fullName  sex  birthday  race  lof  weight  size  Colors
  • 10. Constructeurs  Getters / setters  toString ()  equals ()  hashCode ()  compareTo ()  id  name clic clic  fullName démo  sex  birthday  race  lof  weight  size  Colors
  • 11. public class Dog implements Comparable<Dog> { ... @Override public int compareTo(Dog other) { int result = 0; result = name.compareTo(other.name); if (result != 0) { return result; } ... } Code très limite… NPE ?...
  • 12. Constructeurs  Getters / setters  toString ()  equals ()  hashCode ()  compareTo () 10 attributs  210 lignes  id  name  fullName  sex  birthday  race  lof  weight  size  Colors
  • 13. 10 attributs Java 210 lignes de code
  • 14. Va chercher Guava   toString ()  equals ()  hashCode ()  compareTo () Commons  FAQ 1-2
  • 15. Base Objects
  • 16. Java 5 public String toString() { return "Dog [id=" + id + ", name=" + name + ", fullName=" + fullName 5 + ", sex=" + sex + ", birthday=" + birthday + ", race=" + race + ", lof=" + lof + ", weight=" + weight + ", size=" + size + ", colors=" + colors + "]"; } Simple, efficace et bien pourri   toString ()
  • 17. Java 5 public String toString() { StringBuilder sb = new StringBuilder(); sb.append(Dog.class.getSimpleName()) .append("[id=").append(id) 5 .append(", name=").append(name) .append(", fullName=").append(fullName) ... .append(", colors=").append(colors); return sb.toString(); } Mieux mais sans plus   toString ()
  • 18. Guava public String toString() { return Objects.toStringHelper(this) .add("id", id) .add("name", name) G .add("fullName", fullName) ... .add("colors", colors) .toString(); } Builder  toString ()
  • 19. birthday, fullname, name, race et sex Java 5 public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; 5 Dog other = (Dog) obj; if (birthday == null) { if (other.birthday != null) return false; } else if (!birthday.equals(other.birthday)) return false; if (fullName == null) { if (other.fullName != null) return false; ... } else if (!race.equals(other.race)) return false; if (sex != other.sex) return false; return true; } Carrément illisible   equals ()
  • 20. birthday, fullname, name, race et sex Guava public boolean equals(Object obj) { if (!(obj instanceof Dog)) return false; Dog other = (Dog) obj; G return Objects.equal(birthday, other.birthday) && Objects.equal(fullname, other.fullname) && Objects.equal(name, other.name) && Objects.equal(race, other.race) && sex == other.sex; }  equals ()
  • 21. birthday, fullname, name, race et sex Java 5 public int hashCode() { final int prime = 31; int result = 1; result = prime * result 5 + ((birthday == null) ? 0 : birthday.hashCode()); result = prime * result + ((fullName == null) ? 0 : fullName.hashCode()); result = prime * result + ((name == null) ? 0 : name.hashCode()); result = prime * result + ((race == null) ? 0 : race.hashCode()); result = prime * result + ((sex == null) ? 0 : sex.hashCode()); return result; }  hashCode ()
  • 22. birthday, fullname, name, race et sex Guava public int hashCode() { } return Objects.hashCode(birthday, fullName, name, race, sex); G  hasCode()
  • 23. name, fullname, birthday, weight, size, race et sex Java 5 public int compareTo(Dog other) { int result = 0; result = name.compareTo(other.name); if (result != 0) { 5 return result; } result = fullname.compareTo(other.fullname); if (result != 0) { return result; } ... }  compareTo ()
  • 24. name.compareTo(other.name) Vsother.name.compareTo(name)  compareTo ()
  • 25. name, fullname, birthday, weight, size, race et sex Guava public int compareTo(Dog other) { return ComparisonChain.start() .compare(name, other.name) .compare(fullName, other.fullName) .compare(birthday, other.birthday) G .compare(weight, other.weight) .compare(size, other.size) .compare(race, other.race) .compare(sex, other.sex) .result(); }  compareTo ()
  • 26. Lombok en action
  • 27. Régime Annotations de base
  • 28. Régime  @NoArgsConstructor / @RequiredArgsConstructor / @AllArgsConstructor  constructeurs  @Getter / @Setter  @ToString  @EqualsAndHashCode  @Data  @Getter + @Setter + @ToString + @EqualsAndHashCode + @RequiredArgsConstructor
  • 29. Régime  @NoArgsConstructor / @RequiredArgsConstructor / @AllArgsConstructor  @Getter / @Setter  @ToString  @EqualsAndHashCode  @Data clic clic démo
  • 30. 10 attributs Java 210 lignes de code Lombok 12 lignes + 2-3 @ + compareTo()
  • 31. Factory @RequiredArgsConstructor(staticName = "of") public class Dog { private Integer id; @NonNull private String name;  L private String fullName; @NonNull private SexeEnum sex;  private Date birthday; ... name, sex  Dog dog = Dog.of("Milou", MALE);
  • 32. Factory @RequiredArgsConstructor(staticName = "of") public class Dog { private Integer id; @NonNull private String name;  L private String fullName; @NonNull private SexeEnum sex;  private Date birthday; ... name, sex  Dog dog = Dog.of("Milou", MALE); private Dog(@NonNull final String name, @NonNull final SexeEnum sex) { if (name == null) throw new NullPointerException("name"); if (sex == null) throw new NullPointerException("sex"); this.name = name; this.sex = sex; } public static Dog of(@NonNull final String name, @NonNull final SexeEnum sex) { return new Dog(name, sex); }
  • 33. Trucs pratiques Se simplifier la vie
  • 34. Pratique  @Cleanup  @Synchronized  @SneakyThrows  @Log  @Delegate  val
  • 35. Ressources public void lireJava6(String from) { InputStream in = null; try { in = new FileInputStream(from); byte[] b = new byte[10000]; 5 while (true) { int r = in.read(b); if (r == -1) break; ... } } catch (Exception e) { ... } finally { if (in != null) { try { in.close(); } catch (Exception e) { ... } } ...
  • 36. Ressources public void lire(String from) throws IOException { @Cleanup InputStream in = new FileInputStream(from); byte[] b = new byte[10000]; L while (true) { int r = in.read(b); if (r == -1) break; ... } }
  • 37. Délombok Revenir sans la lib
  • 38. java -jar lombok.jar delombok src -d src-delomboked Délombok <properties> <lombok.sourceDirectory> ${project.basedir}/src/main/java </lombok.sourceDirectory> ... XML <build> <groupId>org.projectlombok</groupId> <artifactId>maven-lombok-plugin</artifactId> <executions> <execution> <phase>generate-sources</phase> </execution> </executions> ... mvn lombok:delombok
  • 39. Délombok @Data public class Dog { 5 5 private Integer id; public class Dog { private String name; private Integer id; private String fullName; private String name; private SexeEnum sex; private String fullName; private Date birthday; ... private String race; private List<String> colors; private Boolean lof; private Double weight; public DogLombok() { private Double size; } private List<String> colors; @java.lang.Override } @java.lang.SuppressWarnings("all") public boolean equals(final java.lang.Obje if (o == this) return true; mvn if (o == null) return false; lombok:delombok if (o.getClass() != this.getClass()) ret final Dog other = (Dog)o; if (this.getId() == null ? other.getId() ... @java.lang.Override @java.lang.SuppressWarnings("all") public int hashCode() { final int PRIME = 31; int result = 1; result = result * PRIME + (this.getId()
  • 40. Lombok-pg Annotations supplémentaires
  • 41. Annotations Pg  @Action  @Builder  @Function  @LazyGetter  @EnumId  @FluentSetter  @Rethrow / @Rethrows  @Predicate  @Singleton  @AutoGenMethodStub  @BoundPropertySupport / @BoundSetter  @DoPrivileged  @ExtensionMethod  @ListenerSupport  @WriteLock / @ReadLock  @Await / @Signal / @AwaitBeforeAndSignalAfter  @Sanitize.Normalize / .With  @SwingInvokeLater / @SwingInvokeAndWait  @Validate.NotEmpty / .NotNull / .With  @VisibleForTesting
  • 42. Fluent @FluentSetter @Getter public class Dog { private Integer id ; L private String name ; private String fullName ; ...  DogLombok dog = new DogLombok(); dog.name("Milou").sex(MALE); println( dog.getName()); //  Milou println( dog.getSex()); //  MALE
  • 43. Builder @Builder @Getter public class Dog { private Integer id ; L private String name ; private String fullName ; ...  Dog dog = Dog.dog().name("Milou").sex(MALE).build(); println( dog.getName()); //  Milou println( dog.getSex()); //  MALE
  • 44. extension @ExtensionMethod({ Dog.class, MyDogExtensionClass.class }) public class DogWithExtension { public void foo() { Dog milou = new Dog("Milou", 12.5, ...); L boolean isTooFat = milou.isTooFat(); } } class MyDogExtensionClass { public static boolean isTooFat(final Dog dog) { double imc = dog.getWeight() / pow(dog.getSize(), 2); return 25 < imc; } } Avec paramètres  FAQ 9  http://blog.developpez.com/todaystip/p11165/dev/java/extensionmethod-de-lombok-pg/
  • 45. Lombok or not Lombok ? Avantages et inconvénients
  • 46. Pro / Cons  Byte code modifié   Version en 0.x  Documentation des prog ?  Magique ?  Compacité  Lecture simplifiée  Code normée  Délombok (pour essayer)
  • 47. Guava tour d’horizon
  • 48. Factory Methods Les choses que j’aime
  • 49. < new Vs static factories > Java 5 List<Integer> primeNumbers = new ArrayList<Integer>(); Set<String> colors = new TreeSet<String>(); 5 Map<String, Integer> ages = new HashMap<String, Integer>();
  • 50. < new Vs static factories > Java 5 List<Integer> primeNumbers = new ArrayList<Integer>(); Set<String> colors = new TreeSet<String>(); Map<String, Integer> ages = new HashMap<String, Integer>(); 5 5 dur dur ? Map<String, List<String>> trucs = new HashMap<String, List<String>>(); Map<? extends Person, Map<String, List<String>>> trucs = new TreeMap<? extends Person, Map<String, List<String>>>(); Map<? extends Wrapper<String, Sex, Person>, Map<String, List<Set<Adress<String, Integer, Country>>>>> trucs = ...
  • 51. < new Vs static factories > Java 5 List<Integer> primeNumbers = new ArrayList<Integer>(); Set<String> colors = new TreeSet<String>(); Map<String, Integer> ages = new HashMap<String, Integer>(); 5 7 Java 7 List<Integer> primeNumbers = new ArrayList<>(); Set<String> colors = new TreeSet<>(); Map<String, Integer> ages = new HashMap<>(); Qui utilise Java 7 en prod ?
  • 52. < new Vs static factories > Java 5 List<Integer> primeNumbers = new ArrayList<Integer>(); Set<String> colors = new TreeSet<String>(); Map<String, Integer> ages = new HashMap<String, Integer>(); 5 7 Java 7 List<Integer> primeNumbers = new ArrayList<>(); Set<String> colors = new TreeSet<>(); Map<String, Integer> ages = new HashMap<>(); Qui utilise Java 7 en prod ? G Guava List<Integer> primeNumbers = newArrayList(); Set<String> colors = newTreeSet(); Map<String, Integer> ages = newHashMap(); Dès maintenant !
  • 53. < new Vs static factories > Java 5 List<Integer> primeNumbers = new ArrayList<Integer>(); Set<String> colors = new TreeSet<String>(); Map<String, Integer> ages = new HashMap<String, Integer>(); 5 7 Java 7 List<Integer> primeNumbers = new ArrayList<>(); Set<String> colors = new TreeSet<>(); Map<String, Integer> ages = new HashMap<>(); Qui utilise Java 7 en prod ? G Guava List<Integer> primeNumbers = newArrayList(); Set<String> colors = newTreeSet(); Map<String, Integer> ages = newHashMap(); Dès maintenant ! Lombok var primeNumbers = new ArrayList<Integer>(); -> primeNumbers.size(); ... L
  • 54. < new Vs static factories > G List of dogs List<Dog> dogs = newArrayList( new Dog("Milou", 12.5, MALE, ...), new Dog("Rintintin", 45.0, MALE, ...), new Dog("Volt", 10.3, MALE, ...), new Dog("Lassie", 45.0, FEMALE, ...), new Dog("Pluto", 22.0, MALE, ...), new Dog("Medor", 35.6, MALE, ...)); [Milou, Rintintin, Volt, Lassie, Pluto, Medor]
  • 55. Immutables Pour que ça ne change pas
  • 57. immutable Quand ? mutable On se demande souvent si une liste doit être immutable mais c’est prendre le problème dans le mauvais sens. La plupart du temps, ce qu’il faut vraiment se demander, c’est si la liste a besoin d’être mutable.
  • 58. < unmodifiables Vs immutables > Java 5 Set<Integer> temp = new LinkedHashSet<Integer>(Arrays.asList(1, 2, 3, 5, 7)); Set<Integer> primes = Collections.unmodifiableSet(temp);
  • 59. < unmodifiables Vs immutables > Java 5 Set<Integer> temp = new LinkedHashSet<Integer>(Arrays.asList(1, 2, 3, 5, 7)); Set<Integer> primes = Collections.unmodifiableSet(temp); G Guava Set<Integer> primes = ImmutableSet.of(1, 2, 3, 5, 7);
  • 60. < unmodifiables Vs immutables > Of ImmutableSet.of(E ImmutableSet.of(E ImmutableSet.of(E ImmutableSet.of(E ImmutableSet.of(E e1) e1, e1, e1, e1, E E E E e2) e2, e2, e2, E E E e3) e3, E e4) e3, E e4, E e5) G ImmutableSet.of(E e1, E e2, E e3, E e4, E e5, E e6, E...) Ne prend pas de null Of ImmutableSet.of() Vide Map et List  FAQ 4  http://blog.developpez.com/guava/p10589/collection/title-212/
  • 61. < Copie de défense > Java 5 public class Dog { private String name; ... private List<String> colors; 5 public Dog(String name, List<String> colors) { this.name = name; ... this.colors = Collections.unmodifiableList( new ArrayList<String>(colors)); } public List<String> getColors() { return colors; }
  • 62. < Copie de défense > Guava public class Dog { private String name; ... private ImmutableList<String> colors; G public Dog(String name, List<String> colors) { this.name = name; ... this.colors = ImmutableList.copyOf(colors); } public ImmutableList<String> getColors() { return colors; } Message clair
  • 63. Collections en plus Multimap, Bipap, Multiset
  • 64. < Multi Map > Java 5 Map<String, List<String>> dogFavoriteColors = new HashMap<String, List<String>>(); 5 } milouColors = new ArrayList<String>(); dogFavoriteColors.put("Milou",milouColors); 5 List<String> milouColors = dogFavoriteColors.get("Milou"); if(milouColors == null) { milouColors.add("Vert");
  • 65. < Multi Map > Java 5 Map<String, List<String>> dogFavoriteColors = new HashMap<String, List<String>>(); 5 } milouColors = new ArrayList<String>(); dogFavoriteColors.put("Milou",milouColors); 5 List<String> milouColors = dogFavoriteColors.get("Milou"); if(milouColors == null) { milouColors.add("Vert"); G Guava Multimap<String, String> dogFavoriteColors = HashMultimap.create(); dogFvoriteColors2.put("Milou", "Jaune"); dogFavoriteColors2.put("Milou", "Rouge");
  • 66. < Bi Map > G Guava BiMap<String, Dog> tatouages = HashBiMap.create(); tatouages.put("ABC123", new Dog("Milou") ); tatouages.put("MBD324", new Dog("Volt") ); tatouages.put("JFT672", new Dog("Lassie") ); println( tatouages ); {ABC123=Milou, MBD324=Volt, ABC123=Milou println( tatouages.inverse() ); Une map bijective JFT672=Lassie} {Milou=ABC123, MDB324=Volt Volt=MBD324, Lassie=JFT672} JFT672=Lassie Il est possible de changer la valeur associée à une clé mais pas d'avoir deux clés avec la même valeur (IllegalArgumentException).
  • 67. < Multi Set > Guava G Multiset<Integer> ages = HashMultiset.create(); ages.add(2); ages.add(3); ages.add(7); ages.add(11); ages.add(3); ages.add(5); println( ages ); [2, 3 x 2, 5, 7, 11] println( ages.count(3) ) 2
  • 69. toString ()  equals ()  hashCode ()  compareTo ()
  • 70. < Preconditions > DOG public class Dog { private Integer private String private String id ; name ; fullName ; 5 ... public Dog(String name, String fullName, ...) { if(name == null) { throw new NPE("Le nom bla bla"); } if(fullName == null) { throw new NPE("bla bla"); } ... this.name = name; this.fullName = fullName; ... }
  • 71. < Preconditions > DOG G import static com.google.common.base.Preconditions.*; public class Dog { private Integer id ; private String name ; private String fullName ; ... public Dog(String name, String fullName, ...) { this.name = checkNotNull(name, "bla bla"); this.fullName = checkNotNull(fullName, "bla bla"); ... } checkNotNull()  NPE checkArgument()  IAE checkState()  ISE
  • 72. Joiner String names = Joiner.on(", ") .join(newArrayList("Lassie", "Volt", "Milou")); "Lassie, Volt, Milou" G Java classique List<String> dogNames = newArrayList("Lassie", "Volt", "Milou"); StringBuilder sb = new StringBuilder(); boolean first = true; for (String name : dogNames) { if(name != null || name.trim().isEmpty()) { continue; } if (!first) { sb.append(", "); } sb.append(name); first = false; } String names = sb.toString();
  • 73. Joiner String names = Joiner.on(", ") .join(newArrayList("Lassie", "Volt", "Milou")); "Lassie, Volt, Milou" G String names = Joiner.on(", ") .join(newArrayList("Lassie", "Volt", null, "Milou"));  NPE 
  • 74. Joiner String names = Joiner.on(", ") .join(newArrayList("Lassie", "Volt", "Milou")); "Lassie, Volt, Milou" G String names = Joiner.on(", ") .join(newArrayList("Lassie", "Volt", null, "Milou"));  NPE  String names = Joiner.on(", ") .skipNulls() .join(newArrayList("Lassie", "Volt", null, "Milou")); "Lassie, Volt, Milou" G
  • 75. Joiner String names = Joiner.on(", ") .join(newArrayList("Lassie", "Volt", "Milou")); "Lassie, Volt, Milou" G String names = Joiner.on(", ") .join(newArrayList("Lassie", "Volt", null, "Milou"));  NPE  String names = Joiner.on(", ") .skipNulls() .join(newArrayList("Lassie", "Volt", null, "Milou")); "Lassie, Volt, Milou" G G String names = Joiner.on(", ") .useForNull("Anonymous")) .join(newArrayList("Lassie", "Volt", null, "Milou")); "Lassie, Volt, Anonymous, Milou"  http://blog.developpez.com/guava/p11054/base/joiner-pour-assembler-des-items/
  • 76. Splitter Iterable<String> dogNames = Splitter.on(",") [ "Lassie", .split("Lassie, Volt, Milou"); "Volt", "Milou" ]
  • 77. Splitter Iterable<String> dogNames = Splitter.on(",") [ "Lassie", .split("Lassie, Volt, Milou"); "Volt", "Milou" ] Iterable<String> dogNames = Splitter.on(",") [ "Lassie", .split("Lassie, Volt, ,Milou"); "Volt", " ", "Milou" ]
  • 78. Splitter Iterable<String> dogNames = Splitter.on(",") [ "Lassie", .split("Lassie, Volt, Milou"); "Volt", "Milou" ] Iterable<String> dogNames = Splitter.on(",") [ "Lassie", .split("Lassie, Volt, ,Milou"); "Volt", " ", "Milou" ] Iterable<String> dogNames = Splitter.on(",") [ "Lassie", .trimResults() "Volt", .split("Lassie, Volt, ,Milou"); "", "Milou" ]
  • 79. Splitter Iterable<String> dogNames = Splitter.on(",") [ "Lassie", .split("Lassie, Volt, Milou"); "Volt", "Milou" ] Iterable<String> dogNames = Splitter.on(",") [ "Lassie", .split("Lassie, Volt, ,Milou"); "Volt", " ", "Milou" ] Iterable<String> dogNames = Splitter.on(",") [ "Lassie", .trimResults() "Volt", .split("Lassie, Volt, ,Milou"); "", "Milou" ] Iterable<String> dogNames = Splitter.on(",") .trimResults() .omitEmptyStrings() [ "Lassie", .split("Lassie, Volt, ,Milou"); "Volt", "Milou" ] G  http://blog.developpez.com/guava/p11045/annotation/splitter-pour-separer-des-items/
  • 80. Wrapper Optional <T> Optional Dog dog = new Dog("Milou", ...); Optional<Dog> opt = Optional.of(dog); assertTrue( opt.isPresent() ); assertEquals( "Milou", opt.get().getName() );
  • 81. Wrapper Optional <T> Optional Dog dog = new Dog("Milou", ...); Optional<Dog> opt = Optional.of(dog); assertTrue( opt.isPresent() ); assertEquals( "Milou", opt.get().getName() ); Optional<Dog> opt = Optional.absent(); assertFalse( opt.isPresent() ); opt.get();  ISE
  • 82. Wrapper Optional <T> Optional Dog dog = new Dog("Milou", ...); Optional<Dog> opt = Optional.of(dog); assertTrue( opt.isPresent() ); assertEquals( "Milou", opt.get().getName() ); Optional<Dog> opt = Optional.absent(); assertFalse( opt.isPresent() ); opt.get();  ISE Dog dog = null; Optional<Dog> opt = Optional.of(dog);  NPE Optional<Dog> opt = Optional.fromNullable(dog);
  • 83. Wrapper Optional <T> Optional Dog dog = new Dog("Milou", ...); Optional<Dog> opt = Optional.of(dog); assertTrue( opt.isPresent() ); assertEquals( "Milou", opt.get().getName() ); Optional<Dog> opt = Optional.absent(); assertFalse( opt.isPresent() ); opt.get();  ISE Dog dog = null; Optional<Dog> opt = Optional.of(dog);  NPE Optional<Dog> opt = Optional.fromNullable(dog); Dog dog = null; Optional<Dog> opt = Optional.fromNullable(dog); Dog dog2 = opt.or( new Dog("noname", ...) ); assertEquals( "noname", dog2.getName() );  http://blog.developpez.com/guava/p11163/base/le-wrapper-optional-de-guava/
  • 86. Super Chien public class SuperChien implements SuperHero { private private private String double Set<String> surnom ; poids ; couleursCostume ; 5 private Set<String> pouvoirs ; ... Les héros peuvent avoir plusieurs costumes donc je n’utilise pas un ImmutableSet. Idem pour les pouvoirs dont la liste augmente avec l’expérience.
  • 87. < Transformation > Transformation List<SuperChien> superChiens = Lists.transform(dogs, @Override new Function<Dog, SuperChien>() { public SuperChien apply(Dog dog) { G SuperChien chien = new SuperChien(); chien.setSurnom("Super " + dog.getName()); chien.setPoids(dog.getWeight()); chien.setCouleursCostume(newHashSet(dog.getColors())) chien.setPouvoirs(newHashSet("Code en Java", "Vole")) ... return chien; } }); [Super Milou, Super Rintintin, Super Volt, Super Lassie, Super Pluto, Super Medor]
  • 88. < Transformation > Transformation G List<SuperChien> superChiens = Lists.transform(dogs, new Function<Dog, SuperChien>() { @Override public SuperChien apply(Dog dog) { SuperChien chien = new SuperChien(); ... return chien; } });  Vue (lazy)  size / isEmpty dispo   Pas pour traitements répétés   FAQ 3 List<SuperChien> chiens = newArrayList(Lists.transform(... ImmutableList<SuperChien> chiens = ImmutableList.copyOf(Lists.transform(...
  • 89. < Filtre > Filtre Predicate<Dog> malePredicate = new Predicate<Dog>() { public boolean apply(Dog dog) { } return dog.getSex() == MALE; G } Iterable<Dog> maleDogs = Iterables.filter(dogs, malePredicate); [Milou, Rintintin, G Volt, Pluto, Medor]
  • 90. < Filtre > Filtre Predicate<Dog> malePredicate = new Predicate<Dog>() { public boolean apply(Dog dog) { } return dog.getSex() == MALE; [Milou, G } Rintintin, Volt, Iterable<Dog> maleDogs = Iterables.filter(dogs, malePredicate); Pluto, Medor] G Dog firstMaleDog = Iterables.find(dogs, malePredicate); Milou G
  • 91. < Filtre > Filtre Predicate<Dog> malePredicate = new Predicate<Dog>() { public boolean apply(Dog dog) { } return dog.getSex() == MALE; [Milou, G } Rintintin, Volt, Iterable<Dog> maleDogs = Iterables.filter(dogs, malePredicate); Pluto, Medor] G Dog firstMaleDog = Iterables.find(dogs, malePredicate); Milou G Dog firstMaleDog = Iterables.find(femaleDogs, malePredicate, DEFAULT_DOG ); Default dog
  • 92. G Seconde liste List<Dog> dogs2 = newArrayList( new Dog("Rintintin", 45.0, MALE, ...), new Dog("Pluto", 22.0, MALE, ...), new Dog("Lulu", 35.6, MALE, ...)); [Rintintin, [Milou, Pluto, Rintintin, Lulu] Volt, Liste 2 : dogs2 Lassie, Pluto, Medor] Liste 1 : dogs
  • 93. < Fluent or not fluent ? > Pas fluent Predicate<Dog> malePredicate = new Predicate<Dog>() { public boolean apply(Dog dog) { return dog.getSex() == MALE; }}; G Function<FullDog, String> nameFunction = new Function<FullDog, String>() { public String apply(FullDog dog) { return dog.getName(); }}; G G Iterable<FullDog> maleDogs = Iterables.filter(dogs, malePredicate); Iterable<String> maleNames = Iterables.transform(maleDogs, nameFunction); [Milou, Rintintin, Volt, Pluto, Medor]
  • 94. < Fluent or not fluent ? > Pas fluent Iterable<FullDog> maleDogs = Iterables.filter(dogs, malePredicate); Iterable<String> maleNames = Iterables.transform(maleDogs, nameFunction); G G Fluent List<String> maleNames2 = FluentIterable.from(dogs) .filter(malePredicate) .transform(nameFunction) .toImmutableList(); Guava 12.0 [Milou, Rintintin, Volt, Pluto,  http://blog.developpez.com/guava/p11092/annotation/fluentiterable-sur- Medor] mon-chien-guava/
  • 95. Cache todo
  • 96. < Memoization > Web Service public class DogService { @Inject private PetShopWebService service; public Integer getNumberDogsSoldYesterday() { 5 return service.checkSales( "dog" ); }
  • 97. < Memoization > Web Service public class DogService { @Inject private PetShopWebService service; public Integer getNumberDogsSoldYesterday() { 5 return service.checkSales( "dog" ); } 5 Cache manuel private Integer nbOfDogsSold; public Integer getNumberDogsSoldYesterday() { if (nbOfDogsSold == null) { nbOfDogsSold = service.checkSales( "dog" ); } return nbOfDogsSold; } Double check null…
  • 98. < Memoization > Guava public class DogService { @Inject private PetShopWebService service; private Supplier<Integer> nbOfDogsSoldSupplier = G Suppliers.memoize( new Supplier<Integer>() { public Integer get() { return service.checkSales( "dog" ); } }); public Integer getNumberDogsSoldYesterday() { return nbOfDogsSoldSupplier.get(); }
  • 99. < Memoization > Guava public class DogService { @Inject private PetShopWebService service; private Supplier<Integer> nbOfDogsSoldSupplier = G Suppliers.memoizeWithExpiration( new Supplier<Integer>() { public Integer get() { return service.checkSales( "dog" ); } }, 1, TimeUnit.DAYS ); public Integer getNumberDogsSoldYesterday() { return nbOfDogsSoldSupplier.get(); }
  • 100. < Cache > Web Service public class DogService { @Inject private PetShopWebService service; private Map<String, Dog> dogMap = Maps.newHashMap(); 5 public Integer getDog(String name) { Dog dog = dogMap.get(name); if(dog == null) { dog = service.getAnimal( "dog", name ); // type-name dogMap.put( name, dog ); } return dog; } Quid du timeout ? Max ?
  • 101. < Cache > Guava public class DogService { @Inject private PetShopWebService service; private LoadingCache<String, Dog> dogCache = G CacheBuilder.newBuilder() .maximumSize(2000) .expireAfterWrite(30, TimeUnit.MINUTES) .build(new CacheLoader<String, Dog>() { public Dog load(String key) { return service.getAnimal( "dog", key ); } }); public Integer getDog(String name) { return dogCache.get( name ); // + try-catch }
  • 102. Hash Fantôme
  • 103. Hash HashFunction hf = Hashing.md5(); HashCode hc = hf.newHasher() .putInt(123) .putString("Milou") G .hash(); byte[] bytes = hc.asBytes();  md5  Murmur3 128 bits  Murmur3 32 bits  Sha1  Sha256  Sha512  goodFastHash
  • 104. < Is in list ? > Préparation int NB_OF_DOGS = 100000; List<Dog> dogs = newArrayList(); Random rand = new Random(); for (int i = 0; i < NB_OF_DOGS; i++) { 5 Dog dog = new Dog(); dog.setName("abc" + rand.nextInt(999)); ... dogs.add(dog); } 5 contains final Dog milou = new Dog(); milou.setName("Milou"); ... boolean isInList = dogs.contains(milou); false (14 ms) dogs.add(milou); boolean isInList = dogs.contains(milou); true (14 ms)
  • 105. < Is in list ? > Bloom filter Funnel<Dog> dogFunnel = new Funnel<Dog>() { public void funnel(Dogdog, PrimitiveSink sink) { sink.putString(dog.getName()) .putString(dog.getFullName()) .putString(dog.getRace()); G }}; BloomFilter<Dog> bloom = BloomFilter.create(dogFunnel, NB_OF_DOGS, 0.01); for (int i = 0; i < NB_OF_DOGS; i++) { ... bloom.put(dog); boolean isInList = bloom.mightContain(milou); false (0 ms) bloom.put(milou); boolean isInList = bloom.mightContain(milou); Guava 13 true (0 ms)  http://blog.developpez.com/guava/p11149/collection/bloom-filter-de-guava-13/
  • 106. Guava or not Guava ? Avantages et inconvénients
  • 107. Pro / Cons  Ne pas en abuser…  Utile  Bonnes pratiques
  • 108. LIENS @thierryleriche
  • 110. ICAUDA  http://icauda.com  http://icauda.com/articles.html (articles)  http://icauda.com/cours.html (slides) Blog Guava  http://blog.developpez.com/guava « Simplifier le code de vos beans Java à l'aide de Commons Lang, Guava et Lombok »  http://thierry-leriche-dessirier.developpez.com/tutoriels/ java/simplifier-code-guava-lombok (article)
  • 111. MERCI
  • 112. 1. Guava Vs Commons FAQ / Bonus 2. Régime façon Apache 3. Fonctionnal prog Vs boucle for 4. Créer des Maps 5. Charsets 6. Converter Spring 7. Orderings 8. Licences 9. Extension avec valeurs 10. Chrono 11. CharMatcher 12. Impl 13. And, or, in… 14. Partition, limit
  • 113. Guava Vs Commons ? http://tinyurl.com/guava-vs-apache 1
  • 114. Régime : la méthode Commons ? L toString public String toString() { return new ToStringBuilder(this) .append("id", id) .append("name", name) .append("fullName", fullName) ... .append("colors", colors) .toString(); } 2
  • 115. Régime : la méthode Commons ? L equals public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (!(obj instanceof Dog)) return false; Dog other = (Dog) obj; return new EqualsBuilder() .append(birthday, other.birthday) .append(fullname, other.fullname) .append(name, other.name) .append(race, other.race) .append(sex, other.sex) .isEquals(); } 2
  • 116. Régime : la méthode Commons ? L hashCode public int hashCode() { return new HashCodeBuilder(17, 37) .append(birthday) .append(fullname) .append(name) .append(race) .append(sex) .toHashCode(); } 2
  • 117. Régime : la méthode Commons ? L compareTo public int compareTo(Dog other) { return new CompareToBuilder() .append(name, other.name) .append(fullname, other.fullname) .append(birthday, other.birthday) ... .append(sex, other.sex) .toComparison(); } 2
  • 118. Fonctionnal prog Vs boucle for : quand ? Transformation List<SuperChien> superChiens = newArrayList( Lists.transform(dogs, new Function<Dog, SuperChien>() { @Override public SuperChien apply(Dog dog) { SuperChien chien = new SuperChien(); ... })); } return chien; G Vs List<SuperChien> superChiens = newArrayList(); 3 for(Dog dog : dogs) { SuperChien chien = new SuperChien(); } ... superChiens.add(chien); G http://code.google.com/p/guava-libraries/wiki/FunctionalExplained
  • 119. Créer des Maps public static final ImmutableMap<String, Integer> of AGES = ImmutableMap.of("Milou", 32, G "Volt", 7, "Pluto", 37, "Lassie", 17); public static final ImmutableMap<String, Integer> Builder AGES = new ImmutableMap.Builder<String, Integer>() .put("Milou", 32) .put("Volt", 7) .put("Pluto", 37) .put("Lassie", 17) 4 .put("Medor", 5) .put("Croquette", 8) G .put("Loulou", 2) ... .build();
  • 120. Charsets Java 5 String name = "Milou"; try { byte[] bytes = name.getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { 5 throw new AssertionError(e); } Ca n’arrive jamais cette exception  G Guava String name = "Milou"; byte[] bytes = name.getBytes(Charsets.UTF_8); 5
  • 121. Converter Spring G import org.springframework...Converter; @Component("dogToChienConverter") public class DogToChienConverter implements Converter<List<Dog>, List<SuperChien>> { public List<SuperChien> convert(List<Dog> dogs) { List<SuperChien> chiens = newArrayList(transform(dogs, new Function<Dog, SuperChien>() { public SuperChien apply(Dog dog) { ... return chien; } })); return chiens; 6 } Lazy or not lazy ?
  • 123. Licences  Lombok : MIT License  Lombok-pg : MIT License  Guava : Apache License 2.0  Commons : Apache License 2.0 8
  • 124. Extension avec valeurs L @ExtensionMethod({ Object.class, MyOtherClass.class }) public class DogWithExtension { public void foo() { String s1 = "toto"; s1.print(); //  toto String s2 = null; s2.print(); //  null } } class MyOtherClass { public static <T> void print(final T value) { System.out.println(value); } 9 } On peut mettre autre chose qu’un "Object", par exemple un "Arrays" , un "Dog" , etc.
  • 125. Extension avec valeurs @ExtensionMethod({ Object.class, MyOtherClass.class }) public class DogWithExtension { public void foo() { String s1 = "toto"; L s1.print(); //  toto String s2 = null; s2.print(); //  null s2.print("vide"); //  vide } } class MyOtherClass { public static <T> void print(final T value) { System.out.println(value); 9 } public static void print(String value, String other) { if (value == null || value.isEmpty()) { System.out.println(other); } else { System.out.println(value); }
  • 126. < Chrono > long start = new Date().getTime(); Guava Java 5 foo(); // traitement long (ou pas) long end = new Date().getTime(); 5 long duration = end - start; // 11 ms Stopwatch sw = new Stopwatch(); sw.start(); foo(); sw.stop(); G long duration = sw.elapsedMillis(); // 11 ms 10 long nano = sw.elapsedTime(NANOSECONDS); // 11179739 ns long micro = sw.elapsedTime(MICROSECONDS); // 11179 us long millis = sw.elapsedTime(MILLISECONDS); // 11 ms  http://blog.developpez.com/guava/p11160/base/le-stop-watch-de-guava/
  • 128. Impl public class Dog implements Comparable<Dog> { private Integer id ; private String name ; private String fullName ; 5 ... @Override public int compareTo(Dog dog) { return ...; } implements List ? aie aie aie 12
  • 129. Impl @AutoGenMethodStub public class Dog implements Comparable<Dog> { private Integer id ; private String name ; L private String fullName ; ... 12
  • 130. And, or, in… And, or, in... G import static com.google.common.base.Predicates.and; import static com.google.common.base.Predicates.in; boolean isRintintinInBoth = and( in(dogs), in(dogs2) ) .apply(new Dog("Rintintin")); true G import static com.google.common.base.Predicates.or; boolean isTintinInOne = or( in(dogs), in(dogs2) ) .apply(new Dog("Tintin"); false 13 [Milou, Rintintin, Liste 2 : dogs2 Liste 1 : dogs Volt, Lassie, [Rintintin, Pluto, Pluto, Medor] Lulu]
  • 131. Partition, limit Partition List<List<FullDog>> partition = Lists.partition(dogs, 4); [Milou, [Pluto, G Rintintin, Medor] Volt, Lassie] G Limit List<FullDog> first4Dogs = newArrayList(Iterables.limit(dogs, 4)); [Milou, 14 Rintintin, Volt, Lassie]
  • 133. I/O todo
  • 134. < I/O > Ressources public void lireJava6(String from) { InputStream in = null; try { in = new FileInputStream(from); byte[] b = new byte[10000]; 5 while (true) { int r = in.read(b); if (r == -1) break; ... } } catch (Exception e) { ... } finally { if (in != null) { try { in.close(); } catch (Exception e) { ... } } ...
  • 135. < I/O > Java 7 public void lireJava7(String from) { try(InputStream in = new FileInputStream(from)) { ... while (true) { ... 7 } } }
  • 136. < I/O > Guava Todo G
  • 138. Todo