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Apache DeltaSpike: The CDI Toolbox


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CDI portable extensions are one of greatest features of Java EE allowing the platform to be extended in a clean and portable way. But allowing extension is just part of the story. CDI opens the door to a whole new eco-system for Java EE, but it’s not the role of the specification to create these extensions.

Apache DeltaSpike is the project that leads this brand new eco-system by providing useful extension modules for CDI applications as well as tools to ease the creation of new ones.

In this session, we’ll start by presenting the DeltaSpike toolbox and show how it helps you to develop for CDI. Then we’ll describe the major extensions included in Deltaspike, including 'configuration', 'scheduling' and 'data'.

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Apache DeltaSpike: The CDI Toolbox

  2. 2. ANTOINE SABOT-DURAND • Senior Software Engineer @Red Hat • Java & OSS : • CDI co-spec lead • CDI community development • Apache Deltaspike committer • @antoine_sd
  3. 3. AGENDA • What is Apache Deltaspike? • Deltaspike Core • Deltaspike Modules • Conclusion
  5. 5. CDI & DELTASPIKE • CDI is a specification. It doesn’t provide business features • but it includes a powerful hook to add these business features • The “portable extensions” feature is this hook • Thanks to it, CDI can be easily enhanced with new high level features
  6. 6. APACHE DELTASPIKE IS… • A collection of ready to use extensions to help you in your projects • A toolbox to help you develop new CDI portable extensions • A great way to learn how to develop your own extension by browsing the source code • The most obvious entry point to CDI eco-system
  7. 7. WHERE DOES IT COMES FROM? Font: Avenir Light Font-size: 64pt Letter-spacing: 410 RGB: 51,181 229 HEX: #35b4e3 C=66.45 M=8.61 Y=1.97 K=0 Miscellaneous CDI Initiatives
  8. 8. TESTED WITH • CDI 1.0, 1.1, 1.2 • JBoss Weld 1.1.3 to 2.2.8 • OpenWebBeans 1.1.1 to 1.2.7 • JBoss AS 7.x,WildFly 8.x • JBoss EAP 6.x • TomEE 1.0.x - 1.7.x • GlassFish 3.x, 4.x • Weblogic 12c
  9. 9. A BIT OF HISTORY Dec 2011 Feb 2012 May 2013 June 2014 ProjectLaunch rel.0.1 rel.0.4(outofincubator) rel.1.0 Dec 2014 rel.1.2.1
  10. 10. WHAT’S INCLUDED? Apache Deltaspike is organized in the following modules Container control provides a portable way to boot CDI container Core Module core features and helpers. Used by all other modules below Partial Bean Module develop generic handler to choose code dynamically at runtime Scheduler Module add job scheduling with Quartz or any other scheduler Security Module add security checking. Integration of 3rd party security framework BeanValidation Module CDI integration for BeanValidation 1.0 JPA Module Enhance JPA integration for CDI 1.0. Mostly useless in Java EE 7 Data Module Implements repository pattern removing JPA boilerplate code Servlet Module Enhance Servlet integration for CDI 1.0. Mostly useless in Java EE 7 JSF Module Enhance JSF by adding CDI scopes, typesafe view config, etc… Test control provide a test solution for CDI based on Junit
  11. 11. MODULES AND DEPENDENCIES Partial Bean Core Bean Validation JPAData Security JSF Scheduler Servlet Test CTRL Containers CTRL
  14. 14. CONFIGURATION 1/2 • DeltaSpike provides a powerful configuration API / SPI • It doesn’t depend on CDI, thus it can be used in portable extension • The entry point is the ConfigResolver class • ConfigSource SPI allows to add new configuration source • Each config has a priority (ordinal).This highest is picked first
  15. 15. CONFIGURATION 2/2 Out of the Box Config Sources ConfigSource Priority Notes System properties 400 Environment properties 300 JNDI values 200 java:comp/env/deltaspike Properties files value 100 META-INF/
  16. 16. CONFIGURATION USAGE //ConfigResolver can be used directly without CDI dependency (useful in extensions)
 String dbUserName = ConfigResolver.getPropertyValue("databaseconfig.username"); … //Config can also be used in CDI mode and typeSafe config
 @ConfigProperty(name = "endpoint.poll.interval")
 private Integer p; // DS provides conversion for String, Integer, Long, Boolean, Float … //But you can provide your own ConfigProperty producer to perform custom conversion
 public class MyConfigPropertyProducer extends BaseConfigPropertyProducer {
 @Produces @ConfigProperty(name = "ignored")
 public MyType produceStringConfiguration(InjectionPoint injectionPoint) { String strValue = getStringPropertyValue(injectionPoint); … }
  17. 17. PROJECT STAGES • Allows to use implementations depending on current environment • You can defined your owned stage or used the provided ones • Pre-defined project stages: • UnitTest, Development, SystemTest, IntegrationTest, Staging, Production • Project Stage is configured thru DS configuration mechanism
  18. 18. PROJECT STAGE EXAMPLE //Setting project stage with environment property -Dorg.apache.deltaspike.ProjectStage=Development … //Using project stage
 private ProjectStage projectStage;
 boolean isDevProjectStage = ProjectStage.Development.equals(this.projectStage);
  19. 19. BEAN EXCLUSION WITH @EXCLUDE @Exclude //like CDI 1.1+ @Vetoed but limited to a class @Exclude(ifProjectStage=Production.class) //based on project stage 
 @Exclude(exceptIfProjectStage=UnitTest.class) //based on project stage 
 @Exclude(onExpression="myProperty==myValue") //based on config value 
 @Exclude(onExpression="[cust exp]", interpretedBy=CustomExpInterpreter.class) //custom
  20. 20. EXCEPTION HANDLERS • Based on CDI event • ExceptionToCatchEvent class sends the exception to DS • @ExceptionHandler marks a class as handlers container • @Handles and ExceptionEvent<T> handle an exception
  21. 21. EXCEPTION HANDLER EXAMPLE public class InventoryActions {
 private EntityManager em;
 private Event<ExceptionToCatchEvent> catchEvent;
 public Integer queryForItem(Item i) {
 try {
 Query q = em.createQuery("SELECT i from Item i where = :id");
 q.setParameter("id", item.getId());
 return q.getSingleResult();
 } catch (PersistenceException e) { ExceptionToCatchEvent(e));
 } … @ExceptionHandler
 public class MyHandler {
 void handleTheException(@Handles ExceptionEvent<Throwable> exEvent) {
 // Do anything with the exception
 @InjectableResource(location = "/version.txt")
 private InputStream is; //Can be customised for alternate sources
 public String getVersion() throws IOException {
 try (BufferedReader br = new BufferedReader(new InputStreamReader(is))) {
 return br.readLine();
  23. 23. INTERNATIONALISATION (I18N) package org.apache.deltaspike.example
 @MessageBundle // Can only be applied on an interface
 public interface SimpleMessage // Will map the org/apache/deltaspike/example/SimpleMessage bundle
 @MessageTemplate(“{my_message}”) // Will map my_message key in bundle
 String welcomeToDeltaSpike(); // For value with parameter i.e welcome_to = Welcome to %s 
 String welcomeTo(String name); 
  24. 24. CDI METADATA BUILDERS • Creating CDI SPI metadata for you extension can be cumbersome • Deltaspike provides builder to ease the work and reduce code verbosity • Major builder are • AnnotatedTypeBuilder • BeanBuilder • WrapperBeanBuilder
  25. 25. BUILDING META DATA EXAMPLES void addTimedBinding(@Observes BeforeBeanDiscovery bbd) {
 AnnotationLiteral<Nonbinding> nonbindingLiteral = new AnnotationLiteral<Nonbinding>(){};
 AnnotatedTypeBuilder<Timed> atb = new AnnotatedTypeBuilder<Timed>()
 .addToMethod(Timed.class.getMethod("name"), nonbindingLiteral)
 } … public void registerGenericBeans(@Observes AfterBeanDiscovery abd) {
 BeanBuilder<User> ubb = new BeanBuilder<User>(beanManager)
 if (weAreOnWeb)
  27. 27. CONTAINER CONTROL public class MainApp {
 public static void main(String[] args) {
 CdiContainer cdiContainer = CdiContainerLoader.getCdiContainer();
 // Starting the application-context enables use of @ApplicationScoped beans
 ContextControl contextControl = cdiContainer.getContextControl();
 // You can use CDI here
  28. 28. TEST CONTROL EXAMPLES @RunWith(CdiTestRunner.class)
 public class MyCdiTest {
 private MyBean bean;
 @Suite.SuiteClasses({ TestX.class, TestY.class})
 public class SuiteLevelContainerControl{}
 @TestControl(projectStage = CustomTestStage.class)
 public class TestStageControl {
 @TestControl(projectStage = ProjectStage.Development.class)
 public void checkDevEnv(){}
  29. 29. SECURITY @Retention(value = RetentionPolicy.RUNTIME)
 @Target({ ElementType.TYPE, ElementType.METHOD })
 public @interface AdminOnly {} … @ApplicationScoped
 public class ApplicationAuthorizer {
 @AdminOnly // Binding security to permission verifier
 public boolean verifyPermission(InvocationContext invocationContext,
 BeanManager manager, @Logged User user) throws Exception {
 return user.getRole().equalsIgnoreCase("Admin");
 } … @AdminOnly
 public void startAdministrativeTask() {
 // Only admins can start admin tasks
  30. 30. SCHEDULER @Scheduled(cronExpression = "0 0/10 * * * ?")
 public class CdiAwareQuartzJob implements org.quartz.Job
 private MyService service;
 public void execute(JobExecutionContext context) throws JobExecutionException
  31. 31. DATA MODULE
  32. 32. DATA MODULE • Data module is an implementation of the repository pattern • At the moment it only support RDBMS thru JPA • But it could be extended to support other data services • It uses the “partial bean” module to dynamically create implementation at runtime
  33. 33. -Eric Evans (in Domain Driven Design) « A Repository represents all objects of a certain type as a conceptual set. It acts like a collection, except with more elaborate querying capability.» REPOSITORY PATTERN DEFINITION
  34. 34. SIMPLE EXAMPLE @Repository //Repo definition to put an interface
 public interface UserRepository extends EntityRepository<User, Long> {
 // method signature creates the JPQL with the partial bean mechanism
 public User findByUsernameAndPassword(String username, char[] password);
 public interface PostRepostiory extends EntityRepository<Post, Long> {
 @Query("SELECT p FROM Post AS p WHERE in (?1)")
 public List<Post> findByFollowing(List<User> following);
  35. 35. JPA FUNCTIONS SUPPORTED • count(); • findAll(); • findBy(PK); • flush(); • refresh(); • remove(); • save(); • saveAndFlush();
  36. 36. CONCLUSION • More info & doc on • Follow @Deltaspiketeam onTwitter • Visit examples: • &!keyword=Deltaspike • Questions ?