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:

Advice, Interceptor, MethodInterceptor, InitializingBean

Direct Known Subclasses:

AbstractRemoteSlsbInvokerInterceptor, LocalSlsbInvokerInterceptor

public abstract class AbstractSlsbInvokerInterceptor
extends JndiObjectLocator
implements MethodInterceptor

Base class for AOP interceptors invoking local or remote Stateless Session Beans. Designed for EJB 2.x, but works for EJB 3 Session Beans as well.

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

Constructors

Constructor and Description
AbstractSlsbInvokerInterceptor()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Fetches EJB home on startup, if necessary.
protected Object	create() Invokes 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.
Object	invoke(MethodInvocation invocation) Prepares the thread context if necessar, and delegates to invokeInContext(org.aopalliance.intercept.MethodInvocation).
protected abstract Object	invokeInContext(MethodInvocation invocation) Perform the given invocation on the current EJB home, within the thread context being prepared accordingly.
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	setExposeAccessContext(boolean exposeAccessContext) Set whether to expose the JNDI environment context for all access to the target EJB, i.e.
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

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)

setExposeAccessContext

public void setExposeAccessContext(boolean exposeAccessContext)

Set whether to expose the JNDI environment context for all access to the target EJB, i.e. for all method invocations on the exposed object reference.

Default is "false", i.e. to only expose the JNDI context for object lookup. Switch this flag to "true" in order to expose the JNDI environment (including the authorization context) for each EJB invocation, as needed by WebLogic for EJBs with authorization requirements.

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".

invoke

public Object invoke(MethodInvocation invocation)
              throws Throwable

Prepares the thread context if necessar, and delegates to invokeInContext(org.aopalliance.intercept.MethodInvocation).

Specified by:

invoke in interface MethodInterceptor

Parameters:

invocation - the method invocation joinpoint

Returns:

the result of the call to Joinpoint.proceed(); might be intercepted by the interceptor

Throws:

Throwable - if the interceptors or the target object throws an exception

invokeInContext

protected abstract Object invokeInContext(MethodInvocation invocation)
                                   throws Throwable

Perform the given invocation on the current EJB home, within the thread context being prepared accordingly. Template method to be implemented by subclasses.

Parameters:

invocation - the AOP method invocation

Returns:

the invocation result, if any

Throws:

Throwable - in case of invocation failure

create

protected Object create()
                 throws NamingException,
                        InvocationTargetException

Invokes 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