org.springframework.ejb.access
Class LocalSlsbInvokerInterceptor

java.lang.Object
  org.springframework.jndi.JndiAccessor
      org.springframework.jndi.JndiLocatorSupport
          org.springframework.jndi.JndiObjectLocator
              org.springframework.ejb.access.AbstractSlsbInvokerInterceptor
                  org.springframework.ejb.access.LocalSlsbInvokerInterceptor

All Implemented Interfaces:

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

Direct Known Subclasses:

LocalStatelessSessionProxyFactoryBean

public class LocalSlsbInvokerInterceptor

extends AbstractSlsbInvokerInterceptor

Invoker for a local Stateless Session Bean. Caches the home object. A local EJB home can never go stale.

See JndiObjectLocator 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.

Author:

Rod Johnson, Juergen Hoeller

Field Summary

Fields inherited from class org.springframework.jndi.JndiLocatorSupport

CONTAINER_PREFIX

Fields inherited from class org.springframework.jndi.JndiAccessor

logger

Constructor Summary

LocalSlsbInvokerInterceptor()

Method Summary

protected javax.ejb.EJBLocalObject	getSessionBeanInstance() Return an EJB instance to delegate the call to.
java.lang.Object	invoke(org.aopalliance.intercept.MethodInvocation invocation) This implementation "creates" a new EJB instance for each invocation.
protected javax.ejb.EJBLocalObject	newSessionBeanInstance() Return a new instance of the stateless session bean.
protected void	releaseSessionBeanInstance(javax.ejb.EJBLocalObject ejb) Release the given EJB instance.
protected void	removeSessionBeanInstance(javax.ejb.EJBLocalObject ejb) Remove the given EJB instance.

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

afterPropertiesSet, create, getCreateMethod, getHome, isHomeRefreshable, refreshHome, setCacheHome, setLookupHomeOnStartup

Methods inherited from class org.springframework.jndi.JndiObjectLocator

getJndiName, lookup, setJndiName

Methods inherited from class org.springframework.jndi.JndiLocatorSupport

convertJndiName, isResourceRef, lookup, setResourceRef

Methods inherited from class org.springframework.jndi.JndiAccessor

getJndiEnvironment, getJndiTemplate, setJndiEnvironment, setJndiTemplate

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalSlsbInvokerInterceptor

public LocalSlsbInvokerInterceptor()

Method Detail

invoke

public java.lang.Object invoke(org.aopalliance.intercept.MethodInvocation invocation)
                        throws java.lang.Throwable

This implementation "creates" a new EJB instance for each invocation. Can be overridden for custom invocation strategies.

Alternatively, override getSessionBeanInstance and releaseSessionBeanInstance to change EJB instance creation, for example to hold a single shared EJB instance.

Throws:

java.lang.Throwable

getSessionBeanInstance

protected javax.ejb.EJBLocalObject getSessionBeanInstance()
                                                   throws javax.naming.NamingException,
                                                          java.lang.reflect.InvocationTargetException

Return an EJB instance to delegate the call to. Default implementation delegates to newSessionBeanInstance.

Throws:

javax.naming.NamingException - if thrown by JNDI

java.lang.reflect.InvocationTargetException - if thrown by the create method

See Also:

newSessionBeanInstance()

releaseSessionBeanInstance

protected void releaseSessionBeanInstance(javax.ejb.EJBLocalObject ejb)

Release the given EJB instance. Default implementation delegates to removeSessionBeanInstance.

Parameters:

ejb - the EJB instance to release

See Also:

removeSessionBeanInstance(javax.ejb.EJBLocalObject)

newSessionBeanInstance

protected javax.ejb.EJBLocalObject newSessionBeanInstance()
                                                   throws javax.naming.NamingException,
                                                          java.lang.reflect.InvocationTargetException

Return a new instance of the stateless session bean. Can be overridden to change the algorithm.

Throws:

javax.naming.NamingException - if thrown by JNDI

java.lang.reflect.InvocationTargetException - if thrown by the create method

See Also:

AbstractSlsbInvokerInterceptor.create()

removeSessionBeanInstance

protected void removeSessionBeanInstance(javax.ejb.EJBLocalObject ejb)

Remove the given EJB instance.

Parameters:

ejb - the EJB instance to remove

See Also:

EJBLocalObject.remove()