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

public class LocalSlsbInvokerInterceptor
extends AbstractSlsbInvokerInterceptor

Invoker for a local Stateless Session Bean. Designed for EJB 2.x, but works for EJB 3 Session Beans as well.

Caches the home object, since 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)

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 and Description
LocalSlsbInvokerInterceptor()

Method Summary

Modifier and Type	Method and Description
protected Method	getCreateMethod(Object home) Check for EJB3-style home object that serves as EJB component directly.
protected Object	getSessionBeanInstance() Return an EJB instance to delegate the call to.
Object	invokeInContext(MethodInvocation invocation) This implementation "creates" a new EJB instance for each invocation.
protected Object	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, getHome, invoke, isHomeRefreshable, refreshHome, setCacheHome, setExposeAccessContext, 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

invokeInContext

public Object invokeInContext(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.EJBLocalObject) to change EJB instance creation, for example to hold a single shared EJB instance.

Specified by:

invokeInContext in class AbstractSlsbInvokerInterceptor

Parameters:

invocation - the AOP method invocation

Returns:

the invocation result, if any

Throws:

Throwable - in case of invocation failure

getCreateMethod

protected Method getCreateMethod(Object home)
                          throws EjbAccessException

Check for EJB3-style home object that serves as EJB component directly.

Overrides:

getCreateMethod in class AbstractSlsbInvokerInterceptor

Parameters:

home - the EJB home object

Returns:

the create method

Throws:

EjbAccessException - if the method couldn't be retrieved

getSessionBeanInstance

protected Object 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()

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)

newSessionBeanInstance

protected Object 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()

removeSessionBeanInstance

protected void removeSessionBeanInstance(EJBLocalObject ejb)

Remove the given EJB instance.

Parameters:

ejb - the EJB instance to remove

See Also:

EJBLocalObject.remove()