org.springframework.ejb.access
Class AbstractSlsbInvokerInterceptor

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

All Implemented Interfaces:

org.aopalliance.aop.Advice, org.aopalliance.intercept.Interceptor, org.aopalliance.intercept.MethodInterceptor, InitializingBean

Direct Known Subclasses:

AbstractRemoteSlsbInvokerInterceptor, LocalSlsbInvokerInterceptor

public abstract class AbstractSlsbInvokerInterceptor
extends JndiObjectLocator
implements org.aopalliance.intercept.MethodInterceptor

Superclass for AOP interceptors invoking local or remote Stateless Session Beans.

Such an interceptor must be the last interceptor in the advice chain. In this case, there is no direct target object: The call is handled in a special way, getting executed on an EJB instance retrieved via an EJB home.

Author:

Rod Johnson, Juergen Hoeller

Field Summary

Fields inherited from class org.springframework.jndi.JndiLocatorSupport

CONTAINER_PREFIX

Fields inherited from class org.springframework.jndi.JndiAccessor

logger

Constructor Summary

AbstractSlsbInvokerInterceptor()

Method Summary

void	afterPropertiesSet() Fetches EJB home on startup, if necessary.
protected Object	create() Invoke the create() method on the cached EJB home object.
protected Method	getCreateMethod(Object home) Determine the create method of the given EJB home object.
protected Object	getHome() Return the EJB home object to use.
protected boolean	isHomeRefreshable() Return whether the cached EJB home object is potentially subject to on-demand refreshing.
protected void	refreshHome() Refresh the cached home object, if applicable.
void	setCacheHome(boolean cacheHome) Set whether to cache the EJB home object once it has been located.
void	setLookupHomeOnStartup(boolean lookupHomeOnStartup) Set whether to look up the EJB home object on startup.

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

Methods inherited from interface org.aopalliance.intercept.MethodInterceptor

invoke

Constructor Detail

AbstractSlsbInvokerInterceptor

public AbstractSlsbInvokerInterceptor()

Method Detail

setLookupHomeOnStartup

public void setLookupHomeOnStartup(boolean lookupHomeOnStartup)

Set whether to look up the EJB home object on startup. Default is "true".

Can be turned off to allow for late start of the EJB server. In this case, the EJB home object will be fetched on first access.

See Also:

setCacheHome(boolean)

setCacheHome

public void setCacheHome(boolean cacheHome)

Set whether to cache the EJB home object once it has been located. Default is "true".

Can be turned off to allow for hot restart of the EJB server. In this case, the EJB home object will be fetched for each invocation.

See Also:

setLookupHomeOnStartup(boolean)

afterPropertiesSet

public void afterPropertiesSet()
                        throws NamingException

Fetches EJB home on startup, if necessary.

Specified by:

afterPropertiesSet in interface InitializingBean

Overrides:

afterPropertiesSet in class JndiObjectLocator

Throws:

NamingException

See Also:

setLookupHomeOnStartup(boolean), refreshHome()

refreshHome

protected void refreshHome()
                    throws NamingException

Refresh the cached home object, if applicable. Also caches the create method on the home object.

Throws:

NamingException - if thrown by the JNDI lookup

See Also:

JndiObjectLocator.lookup(), getCreateMethod(java.lang.Object)

getCreateMethod

protected Method getCreateMethod(Object home)
                          throws EjbAccessException

Determine the create method of the given EJB home object.

Parameters:

home - the EJB home object

Returns:

the create method

Throws:

EjbAccessException - if the method couldn't be retrieved

getHome

protected Object getHome()
                  throws NamingException

Return the EJB home object to use. Called for each invocation.

Default implementation returns the home created on initialization, if any; else, it invokes lookup to get a new proxy for each invocation.

Can be overridden in subclasses, for example to cache a home object for a given amount of time before recreating it, or to test the home object whether it is still alive.

Returns:

the EJB home object to use for an invocation

Throws:

NamingException - if proxy creation failed

See Also:

JndiObjectLocator.lookup(), getCreateMethod(java.lang.Object)

isHomeRefreshable

protected boolean isHomeRefreshable()

Return whether the cached EJB home object is potentially subject to on-demand refreshing. Default is "false".

create

protected Object create()
                 throws NamingException,
                        InvocationTargetException

Invoke the create() method on the cached EJB home object.

Returns:

a new EJBObject or EJBLocalObject

Throws:

NamingException - if thrown by JNDI

InvocationTargetException - if thrown by the create method