java.lang.Object
- org.springframework.jndi.JndiAccessor
- - org.springframework.jndi.JndiLocatorSupport
  - - org.springframework.jndi.JndiObjectLocator
    - - org.springframework.ejb.access.AbstractSlsbInvokerInterceptor
      - org.springframework.ejb.access.AbstractRemoteSlsbInvokerInterceptor
        org.springframework.ejb.access.SimpleRemoteSlsbInvokerInterceptor

All Implemented Interfaces:
Advice, Interceptor, MethodInterceptor, DisposableBean, InitializingBean
Direct Known Subclasses:
SimpleRemoteStatelessSessionProxyFactoryBean
```
public class SimpleRemoteSlsbInvokerInterceptor
extends AbstractRemoteSlsbInvokerInterceptor
implements DisposableBean
```
Basic invoker for a remote Stateless Session Bean. Designed for EJB 2.x, but works for EJB 3 Session Beans as well.
"Creates" a new EJB instance for each invocation, or caches the session bean instance for all invocations (see setCacheSessionBean(boolean)). 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).
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.
Since:
09.05.2003
Author:
Rod Johnson, Juergen Hoeller
See Also:
RemoteAccessException, AbstractSlsbInvokerInterceptor.setLookupHomeOnStartup(boolean), AbstractSlsbInvokerInterceptor.setCacheHome(boolean), AbstractRemoteSlsbInvokerInterceptor.setRefreshHomeOnConnectFailure(boolean)

Field Summary
- Fields inherited from class org.springframework.jndi.JndiLocatorSupport
  CONTAINER_PREFIX
- Fields inherited from class org.springframework.jndi.JndiAccessor
  logger

Constructor Summary
Constructors
Constructor Description
SimpleRemoteSlsbInvokerInterceptor()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`destroy()`	Remove the cached session bean instance, if necessary.
`protected Object`	`doInvoke(MethodInvocation invocation)`	This implementation "creates" a new EJB instance for each invocation.
`protected Object`	`getSessionBeanInstance()`	Return an EJB component instance to delegate the call to.
`protected void`	`refreshHome()`	Reset the cached session bean instance, if necessary.
`protected void`	`releaseSessionBeanInstance(EJBObject ejb)`	Release the given EJB instance.
`void`	`setCacheSessionBean(boolean cacheSessionBean)`	Set whether to cache the actual session bean object.

Methods inherited from class org.springframework.ejb.access.AbstractRemoteSlsbInvokerInterceptor
getCreateMethod, invokeInContext, isConnectFailure, isHomeRefreshable, lookup, newSessionBeanInstance, refreshAndRetry, removeSessionBeanInstance, setHomeInterface, setRefreshHomeOnConnectFailure

Methods inherited from class org.springframework.ejb.access.AbstractSlsbInvokerInterceptor
afterPropertiesSet, create, getHome, invoke, setCacheHome, setExposeAccessContext, setLookupHomeOnStartup

Methods inherited from class org.springframework.jndi.JndiObjectLocator
getExpectedType, getJndiName, 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
  - SimpleRemoteSlsbInvokerInterceptor
```
public SimpleRemoteSlsbInvokerInterceptor()
```
- Method Detail
  - setCacheSessionBean
```
public void setCacheSessionBean(boolean cacheSessionBean)
```
    Set whether to cache the actual session bean object.
    Off by default for standard EJB compliance. Turn this flag on to optimize session bean access for servers that are known to allow for caching the actual session bean object.
    See Also:
    AbstractSlsbInvokerInterceptor.setCacheHome(boolean)
  - doInvoke
```
protected Object doInvoke(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(javax.ejb.EJBObject) to change EJB instance creation, for example to hold a single shared EJB component instance.
    Specified by:
    doInvoke in class AbstractRemoteSlsbInvokerInterceptor
    Parameters:
    invocation - the AOP method invocation
    Returns:
    the invocation result, if any
    Throws:
    Throwable - in case of invocation failure
    See Also:
    AbstractSlsbInvokerInterceptor.getHome(), AbstractRemoteSlsbInvokerInterceptor.newSessionBeanInstance()
  - getSessionBeanInstance
```
protected Object getSessionBeanInstance()
                                 throws NamingException,
                                        InvocationTargetException
```
    Return an EJB component instance to delegate the call to.
    The default implementation delegates to AbstractRemoteSlsbInvokerInterceptor.newSessionBeanInstance().
    Returns:
    the EJB component instance
    Throws:
    NamingException - if thrown by JNDI
    InvocationTargetException - if thrown by the create method
    See Also:
    AbstractRemoteSlsbInvokerInterceptor.newSessionBeanInstance()
  - releaseSessionBeanInstance
```
protected void releaseSessionBeanInstance(EJBObject ejb)
```
    Release the given EJB instance.
    The default implementation delegates to AbstractRemoteSlsbInvokerInterceptor.removeSessionBeanInstance(javax.ejb.EJBObject).
    Parameters:
    ejb - the EJB component instance to release
    See Also:
    AbstractRemoteSlsbInvokerInterceptor.removeSessionBeanInstance(javax.ejb.EJBObject)
  - refreshHome
```
protected void refreshHome()
                    throws NamingException
```
    Reset the cached session bean instance, if necessary.
    Overrides:
    refreshHome in class AbstractSlsbInvokerInterceptor
    Throws:
    NamingException - if thrown by the JNDI lookup
    See Also:
    JndiObjectLocator.lookup(), AbstractSlsbInvokerInterceptor.getCreateMethod(java.lang.Object)
  - destroy
```
public void destroy()
```
    Remove the cached session bean instance, if necessary.
    Specified by:
    destroy in interface DisposableBean

Class SimpleRemoteSlsbInvokerInterceptor

Field Summary

Fields inherited from class org.springframework.jndi.JndiLocatorSupport

Fields inherited from class org.springframework.jndi.JndiAccessor

Constructor Summary

Method Summary

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

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

Methods inherited from class org.springframework.jndi.JndiObjectLocator

Methods inherited from class org.springframework.jndi.JndiLocatorSupport

Methods inherited from class org.springframework.jndi.JndiAccessor

Methods inherited from class java.lang.Object

Constructor Detail

SimpleRemoteSlsbInvokerInterceptor

Method Detail

setCacheSessionBean

doInvoke

getSessionBeanInstance

releaseSessionBeanInstance

refreshHome

destroy