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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.ejb.access

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Java Document (Java Doc)

org.springframework.ejb.access .AbstractSlsbInvokerInterceptor

org.springframework.ejb.access .LocalSlsbInvokerInterceptor

All known Subclasses:   org.springframework.ejb.access .LocalStatelessSessionProxyFactoryBean,
LocalSlsbInvokerInterceptor
public class LocalSlsbInvokerInterceptor extends AbstractSlsbInvokerInterceptor (Code)

Invoker for a local Stateless Session Bean. Caches the home object. A local EJB home can never go stale.
See org.springframework.jndi.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
author:
   Juergen Hoeller
See Also:   AbstractSlsbInvokerInterceptor.setLookupHomeOnStartup
See Also:   AbstractSlsbInvokerInterceptor.setCacheHome

Method Summary
protected EJBLocalObject getSessionBeanInstance()
     Return an EJB instance to delegate the call to.
public 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.

Method Detail
getSessionBeanInstance
protected EJBLocalObject getSessionBeanInstance() throws NamingException, InvocationTargetException(Code)
Return an EJB instance to delegate the call to. Default implementation delegates to newSessionBeanInstance.
throws:
  NamingException - if thrown by JNDI
throws:
  InvocationTargetException - if thrown by the create method
See Also:   LocalSlsbInvokerInterceptor.newSessionBeanInstance

invoke
public Object invoke(MethodInvocation invocation) throws Throwable(Code)
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.

newSessionBeanInstance
protected EJBLocalObject newSessionBeanInstance() throws NamingException, InvocationTargetException(Code)
Return a new instance of the stateless session bean. Can be overridden to change the algorithm.
throws:
  NamingException - if thrown by JNDI
throws:
  InvocationTargetException - if thrown by the create method
See Also:   LocalSlsbInvokerInterceptor.create

releaseSessionBeanInstance
protected void releaseSessionBeanInstance(EJBLocalObject ejb)(Code)
Release the given EJB instance. Default implementation delegates to removeSessionBeanInstance.
Parameters:
  ejb - the EJB instance to release
See Also:   LocalSlsbInvokerInterceptor.removeSessionBeanInstance

removeSessionBeanInstance
protected void removeSessionBeanInstance(EJBLocalObject ejb)(Code)
Remove the given EJB instance.
Parameters:
  ejb - the EJB instance to remove
See Also:   javax.ejb.EJBLocalObject.remove

Methods inherited from org.springframework.ejb.access.AbstractSlsbInvokerInterceptor
public void afterPropertiesSet() throws NamingException(Code)(Java Doc)
protected Object create() throws NamingException, InvocationTargetException(Code)(Java Doc)
protected Method getCreateMethod(Object home) throws EjbAccessException(Code)(Java Doc)
protected Object getHome() throws NamingException(Code)(Java Doc)
protected boolean isHomeRefreshable()(Code)(Java Doc)
protected void refreshHome() throws NamingException(Code)(Java Doc)
public void setCacheHome(boolean cacheHome)(Code)(Java Doc)
public void setLookupHomeOnStartup(boolean lookupHomeOnStartup)(Code)(Java Doc)

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