[CONF] OpenEJB: Callbacks (page edited)

Thu, 29 Nov 2007 22:21:33 -0800

Page Edited : OPENEJB : Callbacks

Callbacks has been edited by David Blevins (Nov 29, 2007).

(View changes)

Content:

Correct usage of PostConstruct, PreDestroy, PrePassivate, PostActivate, and AroundInvoke for EJBs and Interceptors.

For Stateful, Stateless, and MessageDriven, the syntax is as follows:

  • @PostConstruct <any-scope> void <method-name>()
  • @PreDestroy <any-scope> void <method-name>()
  • @PrePassivate <any-scope> void <method-name>()
  • @PostActivate <any-scope> void <method-name>()

For an Interceptor, the syntax includes InvocationContext as follows:

  • @PostConstruct <any-scope> void <method-name>(InvocationContext)
  • @PreDestroy <any-scope> void <method-name>(InvocationContext)
  • @PrePassivate <any-scope> void <method-name>(InvocationContext)
  • @PostActivate <any-scope> void <method-name>(InvocationContext)

The AroundInvoke syntax for an EJB or Interceptor is the same:

  • @AroundInvoke <any-scope> Object <method-name>(InvocationContext) throws Exception

Stateless

import javax.ejb.Stateless;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;

@Stateless
public class MyStatelessBean implements  MyBusinessInterface  {

    @PostConstruct
    public void constructed(){

    }

    @PreDestroy
    public void destroy(){

    }

    @AroundInvoke
    public Object invoke(InvocationContext invocationContext) throws Exception {
        return invocationContext.proceed();
    }
}

Stateful

import javax.ejb.Stateful;
import javax.ejb.PostActivate;
import javax.ejb.PrePassivate;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;

@Stateful
public class MyStatefulBean implements  MyBusinessInterface  {

    @PostConstruct
    public void constructed(){

    }

    @PreDestroy
    public void destroy(){

    }

    @AroundInvoke
    public Object invoke(InvocationContext invocationContext) throws Exception {
        return invocationContext.proceed();
    }

    @PostActivate
    public void activated(){

    }

    @PrePassivate
    public void passivate(){

    }
}

MessageDriven

import javax.ejb.MessageDriven;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;

@MessageDriven
public class MyMessageDrivenBean implements  MyListenerInterface  {

    @PostConstruct
    public void constructed(){

    }

    @PreDestroy
    public void destroy(){

    }

    @AroundInvoke
    public Object invoke(InvocationContext invocationContext) throws Exception {
        return invocationContext.proceed();
    }
}

Interceptor

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.interceptor.InvocationContext;
import javax.interceptor.AroundInvoke;
import javax.ejb.PostActivate;
import javax.ejb.PrePassivate;

public class MyInterceptor {

    @PostConstruct
    public void constructed(InvocationContext invocationContext){

    }

    @PreDestroy
    public void destroy(InvocationContext invocationContext){

    }

    @AroundInvoke
    public Object invoke(InvocationContext invocationContext) throws Exception {
        return invocationContext.proceed();
    }

    @PostActivate
    public void activated(InvocationContext invocationContext){

    }

    @PrePassivate
    public void passivate(InvocationContext invocationContext){

    }
}

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