create-netflix-clone-02-server.pdf

codenameone.com github.com/codenameone/CodenameOne
Server and
Lombok
Introduction

Server and Lombok Introduction
We use H2 for simplicity as usual we use JPA for persistence
Lombok is used for entities and DTOs
There’s only one webservice
We don’t need more without authentication and other complexities

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-
instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/
maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath/> 
</parent>
<groupId>com.codename1.demos</groupId>
<artifactId>netflixclone</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>NetflixCloneServer</name>
<description>Netflix Clone Sample</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<artifactId>spring-boot-starter-data-jpa</artifactId>
Source Listing - pom.xml

<artifactId>netflixclone</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>NetflixCloneServer</name>
<description>Netflix Clone Sample</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<artifactId>spring-boot-starter-jersey</artifactId>
</dependency>
<dependency>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>

<dependency>
<artifactId>spring-boot-starter-jersey</artifactId>
</dependency>
<dependency>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>

<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>

Lombok
Java language enhancement tool
Requires IDE plugin
Removes boilerplate getters/setters
Works with Codename One as well but not as valuable thanks to properties
See https://www.codenameone.com/blog/tip-using-lombok-other-tools.html

public class ConstructorExample<T> {
private int x, y;
@NonNull private T description;
private ConstructorExample(T description) {
if (description == null) throw new NullPointerException("description");
this.description = description;
}
public static <T> ConstructorExample<T> of(T description) {
return new ConstructorExample<T>(description);
}
@java.beans.ConstructorProperties({"x", "y", "description"})
protected ConstructorExample(int x, int y, T description) {
this.x = x;
this.y = y;
}
public static class NoArgsExample {
@NonNull private String field;
public NoArgsExample() {
Source Listing - Lombok: Constructors

this.y = y;
}
}
}
}
@RequiredArgsConstructor(staticName = "of")
@AllArgsConstructor(access = AccessLevel.PROTECTED)
private int x, y;
@NonNull
private T description;
@NoArgsConstructor
@NonNull
private String field;
}
}

this.x = x;
this.y = y;
}
}
}
}
private int x, y;
@NonNull
@NoArgsConstructor
@NonNull
}
}

@java.beans.ConstructorProperties({"x", "y", "description"})
this.x = x;
this.y = y;
}
}
}
}
private int x, y;
@NonNull
@NoArgsConstructor
@NonNull
}
}

private int x, y;
@NonNull
@NoArgsConstructor
@NonNull
}
}

public class NonNullExample extends Something {
private String name;
public NonNullExample(@NonNull Person person) {
super("Hello");
if (person == null) {
throw new NullPointerException("person is marked @NonNull but is null");
}
this.name = person.getName();
}
}
public class NonNullExample extends Something {
public NonNullExample(@NonNull Person person) {
super("Hello");
this.name = person.getName();
}
}
Source Listing - Lombok: NonNull

public class CleanupExample {
public static void main(String[] args) throws IOException {
InputStream in = new FileInputStream(args[0]);
try {
OutputStream out = new FileOutputStream(args[1]);
try {
byte[] b = new byte[10000];
while (true) {
int r = in.read(b);
if (r == -1) break;
out.write(b, 0, r);
}
} finally {
if (out != null) {
out.close();
}
}
} finally {
if (in != null) {
in.close();
}
}
}
}
Source Listing - Lombok: Cleanup

if (r == -1) break;
out.write(b, 0, r);
}
} finally {
if (out != null) {
out.close();
}
}
} finally {
if (in != null) {
in.close();
}
}
}
}
public static void main(String[] args) throws IOException {
@Cleanup InputStream in = new FileInputStream(args[0]);
@Cleanup OutputStream out = new FileOutputStream(args[1]);
byte[] b = new byte[10000];
while (true) {
int r = in.read(b);
if (r == -1) break;
out.write(b, 0, r);
}
}
}
Source Listing - Lombok: Cleanup

public class GetterSetterExample {
private int age = 10;
@Override public String toString() {
return String.format("%s (age: %d)", name, age);
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
protected void setName(String name) {
this.name = name;
}
}
@Getter @Setter private int age = 10;
Source Listing - Lombok: Getters & Setters

}
return age;
}
public void setAge(int age) {
this.age = age;
}
protected void setName(String name) {
this.name = name;
}
}
@Getter @Setter private int age = 10;
@Setter(AccessLevel.PROTECTED) private String name;
}
}
Source Listing - Lombok: Getters & Setters

public class DataExample {
private final String name;
private int age;
private double score;
private String[] tags;
public DataExample(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
void setAge(int age) {
this.age = age;
}
return this.age;
}
public void setScore(double score) {
this.score = score;
}
Source Listing - Lombok: Data (and more…)

}
public void setTags(String[] tags) {
this.tags = tags;
}
return "DataExample(" + this.getName() + ", " + this.getAge() + ", " + this.getScore() +
", " + Arrays.deepToString(this.getTags()) + ")";
}
protected boolean canEqual(Object other) {
return other instanceof DataExample;
}
@Override public boolean equals(Object o) {
if (o == this) return true;
if (!(o instanceof DataExample)) return false;
DataExample other = (DataExample) o;
if (!other.canEqual((Object)this)) return false;
if (this.getName() == null ? other.getName() != null : !
this.getName().equals(other.getName())) return false;
if (this.getAge() != other.getAge()) return false;
if (Double.compare(this.getScore(), other.getScore()) != 0) return false;
if (!Arrays.deepEquals(this.getTags(), other.getTags())) return false;
return true;
}
@Override public int hashCode() {
final int PRIME = 59;
int result = 1;

if (this.getAge() != other.getAge()) return false;
if (Double.compare(this.getScore(), other.getScore()) != 0) return false;
if (!Arrays.deepEquals(this.getTags(), other.getTags())) return false;
return true;
}
int result = 1;
final long temp1 = Double.doubleToLongBits(this.getScore());
result = (result*PRIME) + (this.getName() == null ? 43 : this.getName().hashCode());
result = (result*PRIME) + this.getAge();
result = (result*PRIME) + (int)(temp1 ^ (temp1 >>> 32));
result = (result*PRIME) + Arrays.deepHashCode(this.getTags());
return result;
}
public static class Exercise<T> {
private final T value;
private Exercise(String name, T value) {
this.name = name;
this.value = value;
}
public static <T> Exercise<T> of(String name, T value) {
return new Exercise<T>(name, value);
}

result = (result*PRIME) + (int)(temp1 ^ (temp1 >>> 32));
result = (result*PRIME) + Arrays.deepHashCode(this.getTags());
return result;
}
private Exercise(String name, T value) {
this.name = name;
this.value = value;
}
public static <T> Exercise<T> of(String name, T value) {
return new Exercise<T>(name, value);
}
return this.name;
}
public T getValue() {
return this.value;
}
return "Exercise(name=" + this.getName() + ", value=" + this.getValue() + ")";
}
protected boolean canEqual(Object other) {

int result = 1;
result = (result*PRIME) + (this.getName() == null ? 43 : this.getName().hashCode());
result = (result*PRIME) + (this.getValue() == null ? 43 :
this.getValue().hashCode());
return result;
}
}
}
@Data public class DataExample {
@Setter(AccessLevel.PACKAGE) private int age;
private double score;
private String[] tags;
@ToString(includeFieldNames=true)
@Data(staticConstructor="of")
}
}

public class ValVarExample {
public String example() {
final ArrayList<String> example = new ArrayList<String>();
example.add("Hello, World!");
int varExample = 3;
ArrayList<String> varExample = new ArrayList<String>();
varExample = new ArrayList<String>();
final String foo = example.get(0);
return foo.toLowerCase();
}
}
public class ValVarExample {
public String example() {
val example = new ArrayList<String>();
example.add("Hello, World!");
var varExample = new ArrayList<String>();
varExample = new ArrayList<String>();
val foo = example.get(0);
return foo.toLowerCase();
}
}
Source Listing - Lombok: val/var

Lombok: There are a lot of features we didn’t cover…
@Value
@Builder
@SneakyThrows
@Synchronized
@With

Lombok: There are a lot of features we didn’t cover…
@Log
@Getter(lazy=true)
You can learn more at https://projectlombok.org/features/all

Thank You

create-netflix-clone-02-server.pdf

create-netflix-clone-02-server.pdf

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