org.jboss.weld.ejb

Class SessionBeanInjectionPoint

java.lang.Object

org.jboss.weld.ejb.SessionBeanInjectionPoint

public class SessionBeanInjectionPoint
extends Object

The spec requires that an InjectionPoint of a session bean returns:

• a Bean object representing the session bean if the session bean is a contextual instance (obtained using Inject)
• null if the session bean is a non-contextual instance obtained using @EJB or from JNDI

Each time a contextual instance of a session bean is created we add its bean class to a thread local collection. The class is removed from the collection after instance creation.

If an InjectionPoint of a session bean is about to be injected using InjectionPointBean and the session bean class is present in the thread local collection (indicating that it is a contextual instance), we leave the InjectionPoint untouched and inject it. Otherwise, we wrap the InjectionPoint within NonContextualSessionBeanInjectionPoint which always returns null from getBean().

The only known limitation of this approach is that if the same session bean is used both in its contextual and non-contextual form within a single dependency chain (non-contextual instance of Foo injecting another Foo instance using Inject), the behavior will not be reliable.

Author:

Jozef Hartinger

Method Summary

Methods

Modifier and Type	Method and Description
static void	registerContextualInstance(EjbDescriptor<?> descriptor) Indicates that a contextual instance of a session bean is about to be constructed.
static void	unregisterContextualInstance(EjbDescriptor<?> descriptor) Indicates that contextual session bean instance has been constructed.
static InjectionPoint	wrapIfNecessary(InjectionPoint ip) Returns the InjectionPoint passed in as a parameter if this InjectionPoint belongs to a contextual instance of a session bean.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

registerContextualInstance

public static void registerContextualInstance(EjbDescriptor<?> descriptor)

Indicates that a contextual instance of a session bean is about to be constructed.

unregisterContextualInstance

public static void unregisterContextualInstance(EjbDescriptor<?> descriptor)

Indicates that contextual session bean instance has been constructed.

wrapIfNecessary

public static InjectionPoint wrapIfNecessary(InjectionPoint ip)

Returns the InjectionPoint passed in as a parameter if this InjectionPoint belongs to a contextual instance of a session bean. Otherwise, the method wraps the InjectionPoint to guarantee that getBean() always returns null.