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LocalSlsbInvokerInterceptor (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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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:

Advice, Interceptor, MethodInterceptor, InitializingBean

Direct Known Subclasses:

LocalStatelessSessionProxyFactoryBean

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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 by default 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 best solution is to set the lookupHomeOnStartup property to false, in which case the home will be fetched on first access to the EJB. (This flag is only true by default for backwards compatibility reasons).

Author:

Rod Johnson, Juergen Hoeller

See Also:

AbstractSlsbInvokerInterceptor.setLookupHomeOnStartup(boolean), AbstractSlsbInvokerInterceptor.setCacheHome(boolean)

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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  EJBLocalObject	getSessionBeanInstance()           Return an EJB instance to delegate the call to.
Object	invoke(MethodInvocation invocation)           This implementation "creates" a new EJB instance for each invocation.
protected  EJBLocalObject	newSessionBeanInstance()           Return a new instance of the stateless session bean.
protected  void	releaseSessionBeanInstance(EJBLocalObject ejb)           Release the given EJB instance.
protected  void	removeSessionBeanInstance(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
getExpectedType, getJndiName, lookup, setExpectedType, setJndiName

 

Methods inherited from class org.springframework.jndi.JndiLocatorSupport
convertJndiName, isResourceRef, lookup, 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 Object invoke(MethodInvocation invocation)
              throws 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:

Throwable

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getSessionBeanInstance

protected EJBLocalObject getSessionBeanInstance()
                                         throws NamingException,
                                                InvocationTargetException

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

Throws:

NamingException - if thrown by JNDI

InvocationTargetException - if thrown by the create method

See Also:

newSessionBeanInstance()

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releaseSessionBeanInstance

protected void releaseSessionBeanInstance(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)

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newSessionBeanInstance

protected EJBLocalObject newSessionBeanInstance()
                                         throws NamingException,
                                                InvocationTargetException

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

Throws:

NamingException - if thrown by JNDI

InvocationTargetException - if thrown by the create method

See Also:

AbstractSlsbInvokerInterceptor.create()

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removeSessionBeanInstance

protected void removeSessionBeanInstance(EJBLocalObject ejb)

Remove the given EJB instance.

Parameters:

ejb - the EJB instance to remove

See Also:

EJBLocalObject.remove()

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