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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.ejb.access 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.springframework.ejb.access.AbstractSlsbInvokerInterceptor
   org.springframework.ejb.access.AbstractRemoteSlsbInvokerInterceptor
      org.springframework.ejb.access.SimpleRemoteSlsbInvokerInterceptor

All known Subclasses:   org.springframework.ejb.access.SimpleRemoteStatelessSessionProxyFactoryBean,
SimpleRemoteSlsbInvokerInterceptor
public class SimpleRemoteSlsbInvokerInterceptor extends AbstractRemoteSlsbInvokerInterceptor (Code)

Basic invoker for a remote Stateless Session Bean. "Creates" a new EJB instance for each invocation.

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).

This invoker is typically used with an RMI business interface, which serves as super-interface of the EJB component interface. Alternatively, this invoker can also proxy a remote SLSB with a matching non-RMI business interface, i.e. an interface that mirrors the EJB business methods but does not declare RemoteExceptions. In the latter case, RemoteExceptions thrown by the EJB stub will automatically get converted to Spring's unchecked RemoteAccessException.
author:
   Rod Johnson
author:
   Juergen Hoeller
since:
   09.05.2003
See Also:   org.springframework.remoting.RemoteAccessException
See Also:   AbstractSlsbInvokerInterceptor.setLookupHomeOnStartup
See Also:   AbstractSlsbInvokerInterceptor.setCacheHome
See Also:   AbstractRemoteSlsbInvokerInterceptor.setRefreshHomeOnConnectFailure





Method Summary
protected  ObjectdoInvoke(MethodInvocation invocation)
     This implementation "creates" a new EJB instance for each invocation.
protected  EJBObjectgetSessionBeanInstance()
     Return an EJB instance to delegate the call to.
protected  voidreleaseSessionBeanInstance(EJBObject ejb)
     Release the given EJB instance.



Method Detail
doInvoke
protected Object doInvoke(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.




getSessionBeanInstance
protected EJBObject 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:   SimpleRemoteSlsbInvokerInterceptor.newSessionBeanInstance



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



Methods inherited from org.springframework.ejb.access.AbstractRemoteSlsbInvokerInterceptor
abstract protected Object doInvoke(MethodInvocation invocation) throws Throwable(Code)(Java Doc)
public Object invoke(MethodInvocation invocation) throws Throwable(Code)(Java Doc)
protected boolean isConnectFailure(RemoteException ex)(Code)(Java Doc)
protected boolean isHomeRefreshable()(Code)(Java Doc)
protected Object lookup() throws NamingException(Code)(Java Doc)
protected EJBObject newSessionBeanInstance() throws NamingException, InvocationTargetException(Code)(Java Doc)
protected Object refreshAndRetry(MethodInvocation invocation) throws Throwable(Code)(Java Doc)
protected void removeSessionBeanInstance(EJBObject ejb)(Code)(Java Doc)
public void setHomeInterface(Class homeInterface)(Code)(Java Doc)
public void setRefreshHomeOnConnectFailure(boolean refreshHomeOnConnectFailure)(Code)(Java Doc)

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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