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SimpleRemoteStatelessSessionProxyFactoryBean (Spring Framework) - Spring Framework 1.2.9 API 文档英文版

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org.springframework.ejb.access
Class SimpleRemoteStatelessSessionProxyFactoryBean

java.lang.Object
  extended by org.springframework.jndi.JndiAccessor
      extended by org.springframework.jndi.JndiLocatorSupport
          extended by org.springframework.jndi.JndiObjectLocator
              extended by org.springframework.ejb.access.AbstractSlsbInvokerInterceptor
                  extended by org.springframework.ejb.access.AbstractRemoteSlsbInvokerInterceptor
                      extended by org.springframework.ejb.access.SimpleRemoteSlsbInvokerInterceptor
                          extended by org.springframework.ejb.access.SimpleRemoteStatelessSessionProxyFactoryBean
All Implemented Interfaces:
Advice, Interceptor, MethodInterceptor, FactoryBean, InitializingBean
public class SimpleRemoteStatelessSessionProxyFactoryBean
extends SimpleRemoteSlsbInvokerInterceptor
implements FactoryBean

Convenient factory for remote SLSB proxies. If you want control over interceptor chaining, use an AOP ProxyFactoryBean with SimpleRemoteSlsbInvokerInterceptor rather than rely on this class.

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 proxy factory is typically used with an RMI business interface, which serves as super-interface of the EJB component interface. Alternatively, this factory 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, Colin Sampaleanu, 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
SimpleRemoteStatelessSessionProxyFactoryBean()
           
 
Method Summary
 void afterPropertiesSet()
          Fetches EJB home on startup, if necessary.
 Class getBusinessInterface()
          Return the business interface of the EJB we're proxying.
 Object getObject()
          Return an instance (possibly shared or independent) of the object managed by this factory.
 Class getObjectType()
          Return the type of object that this FactoryBean creates, or null if not known in advance.
 boolean isSingleton()
          Is the bean managed by this factory a singleton or a prototype?
 void setBusinessInterface(Class businessInterface)
          Set the business interface of the EJB we're proxying.
 
Methods inherited from class org.springframework.ejb.access.SimpleRemoteSlsbInvokerInterceptor
doInvoke, getSessionBeanInstance, releaseSessionBeanInstance
 
Methods inherited from class org.springframework.ejb.access.AbstractRemoteSlsbInvokerInterceptor
invoke, isConnectFailure, isHomeRefreshable, lookup, newSessionBeanInstance, refreshAndRetry, removeSessionBeanInstance, setHomeInterface, setRefreshHomeOnConnectFailure
 
Methods inherited from class org.springframework.ejb.access.AbstractSlsbInvokerInterceptor
create, getCreateMethod, getHome, refreshHome, setCacheHome, 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

SimpleRemoteStatelessSessionProxyFactoryBean

public SimpleRemoteStatelessSessionProxyFactoryBean()
Method Detail

setBusinessInterface

public void setBusinessInterface(Class businessInterface)
Set the business interface of the EJB we're proxying. This will normally be a super-interface of the EJB remote component interface. Using a business methods interface is a best practice when implementing EJBs.

You can also specify a matching non-RMI business interface, i.e. an interface that mirrors the EJB business methods but does not declare RemoteExceptions. In this case, RemoteExceptions thrown by the EJB stub will automatically get converted to Spring's generic RemoteAccessException.

Parameters:
businessInterface - the business interface of the EJB

getBusinessInterface

public Class getBusinessInterface()
Return the business interface of the EJB we're proxying.

afterPropertiesSet

public void afterPropertiesSet()
                        throws NamingException
Description copied from class: AbstractSlsbInvokerInterceptor
Fetches EJB home on startup, if necessary.

Specified by:
afterPropertiesSet in interface InitializingBean
Overrides:
afterPropertiesSet in class AbstractSlsbInvokerInterceptor
Throws:
NamingException
See Also:
AbstractSlsbInvokerInterceptor.setLookupHomeOnStartup(boolean), AbstractSlsbInvokerInterceptor.refreshHome()

getObject

public Object getObject()
Description copied from interface: FactoryBean
Return an instance (possibly shared or independent) of the object managed by this factory. As with a BeanFactory, this allows support for both the Singleton and Prototype design pattern.

If this method returns null, the factory will consider the FactoryBean as not fully initialized and throw a corresponding FactoryBeanNotInitializedException.

Specified by:
getObject in interface FactoryBean
Returns:
an instance of the bean (should not be null; a null value will be considered as an indication of incomplete initialization)
See Also:
FactoryBeanNotInitializedException

getObjectType

public Class getObjectType()
Description copied from interface: FactoryBean
Return the type of object that this FactoryBean creates, or null if not known in advance. This allows to check for specific types of beans without instantiating objects, for example on autowiring.

For a singleton, this should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

NOTE: Autowiring will simply ignore FactoryBeans that return null here. Therefore it is highly recommended to implement this method properly, using the current state of the FactoryBean.

Specified by:
getObjectType in interface FactoryBean
Returns:
the type of object that this FactoryBean creates, or null if not known at the time of the call
See Also:
ListableBeanFactory.getBeansOfType(java.lang.Class)

isSingleton

public boolean isSingleton()
Description copied from interface: FactoryBean
Is the bean managed by this factory a singleton or a prototype? That is, will getObject() always return the same object (a reference that can be cached)?

NOTE: If a FactoryBean indicates to hold a singleton object, the object returned from getObject() might get cached by the owning BeanFactory. Hence, do not return true unless the FactoryBean always exposes the same reference.

The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

Specified by:
isSingleton in interface FactoryBean
Returns:
if this bean is a singleton
See Also:
FactoryBean.getObject()
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