org.springframework.ejb.access
Class LocalStatelessSessionProxyFactoryBean

java.lang.Object
  org.springframework.jndi.AbstractJndiLocator
      org.springframework.ejb.access.AbstractSlsbInvokerInterceptor
          org.springframework.ejb.access.LocalSlsbInvokerInterceptor
              org.springframework.ejb.access.LocalStatelessSessionProxyFactoryBean

All Implemented Interfaces:

org.aopalliance.aop.Advice, FactoryBean, InitializingBean, org.aopalliance.intercept.Interceptor, org.aopalliance.intercept.MethodInterceptor

public class LocalStatelessSessionProxyFactoryBean

extends LocalSlsbInvokerInterceptor

implements FactoryBean

Convenient factory for local Stateless Session Bean (SLSB) proxies. If you want control over interceptor chaining, use an AOP ProxyFactoryBean with LocalSlsbInvokerInterceptor rather than rely on this class.

See AbstractJndiLocator for info on how to specify the JNDI location of the target EJB.

In a bean container, this class is normally best used as a singleton. However, if that bean container pre-instantiates singletons (as do the XML ApplicationContext variants) you may have a problem if the bean container is loaded before the EJB container loads the target EJB. That is because the JNDI lookup will be performed in the init method of this class and cached, but the EJB will not have been bound at the target location yet. The solution is to not pre-instantiate this factory object, but allow it to be created on first use. In the XML containers, this is controlled via the "lazy-init" attribute.

Since:

09-May-2003

Version:

$Id: LocalStatelessSessionProxyFactoryBean.java,v 1.10 2004/03/18 02:46:14 trisberg Exp $

Author:

Rod Johnson, Colin Sampaleanu

Field Summary

Fields inherited from class org.springframework.jndi.AbstractJndiLocator

CONTAINER_PREFIX, logger

Constructor Summary

LocalStatelessSessionProxyFactoryBean()

Method Summary

void	afterLocated() Initialization hook after the AbstractJndiLocator's located callback.
java.lang.Class	getBusinessInterface() Return the business interface of the EJB we're proxying.
java.lang.Object	getObject() Return an instance (possibly shared or independent) of the object managed by this factory.
java.lang.Class	getObjectType() Return the type of object that this FactoryBean creates, or null if not known in advance.
boolean	isSingleton() Is the bean managed by this factory a singleton or a prototype? That is, will getObject() always return the same object?
void	setBusinessInterface(java.lang.Class businessInterface) Set the business interface of the EJB we're proxying.

Methods inherited from class org.springframework.ejb.access.LocalSlsbInvokerInterceptor

invoke, newSessionBeanInstance

Methods inherited from class org.springframework.ejb.access.AbstractSlsbInvokerInterceptor

create, getCachedEjbHome, located

Methods inherited from class org.springframework.jndi.AbstractJndiLocator

afterPropertiesSet, getJndiEnvironment, getJndiName, getJndiTemplate, isResourceRef, setJndiEnvironment, setJndiName, setJndiTemplate, setResourceRef

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalStatelessSessionProxyFactoryBean

public LocalStatelessSessionProxyFactoryBean()

Method Detail

setBusinessInterface

public void setBusinessInterface(java.lang.Class businessInterface)

Set the business interface of the EJB we're proxying. This will normally be a super-interface of the EJB local component interface. Using a business methods interface is a best practice when implementing EJBs.

Parameters:

businessInterface - set the business interface of the EJB

getBusinessInterface

public java.lang.Class getBusinessInterface()

Return the business interface of the EJB we're proxying.

afterLocated

public void afterLocated()

Description copied from class: AbstractSlsbInvokerInterceptor

Initialization hook after the AbstractJndiLocator's located callback. This implementation does nothing.

Overrides:

afterLocated in class AbstractSlsbInvokerInterceptor

See Also:

AbstractSlsbInvokerInterceptor.located(java.lang.Object)

getObject

public java.lang.Object getObject()

Description copied from interface: FactoryBean

Return an instance (possibly shared or independent) of the object managed by this factory. As with a BeanFactory, this allows support for both the Singleton and Prototype design pattern.

Specified by:

getObject in interface FactoryBean

Returns:

an instance of the bean (should never be null)

getObjectType

public java.lang.Class getObjectType()

Description copied from interface: FactoryBean

Return the type of object that this FactoryBean creates, or null if not known in advance. This allows to check for specific types of beans without instantiating objects, e.g. on autowiring.

For a singleton, this can simply return getObject().getClass(), or even null, as autowiring will always check the actual objects for singletons. For prototypes, returning a meaningful type here is highly advisable, as autowiring will simply ignore them else.

Specified by:

getObjectType in interface FactoryBean

Returns:

the type of object that this FactoryBean creates, or null

See Also:

ListableBeanFactory.getBeansOfType(java.lang.Class, boolean, boolean)

isSingleton

public boolean isSingleton()

Description copied from interface: FactoryBean

Is the bean managed by this factory a singleton or a prototype? That is, will getObject() always return the same object?

The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory.

Specified by:

isSingleton in interface FactoryBean

Returns:

if this bean is a singleton