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JndiRmiClientInterceptor (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.remoting.rmi
Class JndiRmiClientInterceptor

java.lang.Object
  org.springframework.jndi.JndiAccessor
      org.springframework.jndi.JndiLocatorSupport
          org.springframework.jndi.JndiObjectLocator
              org.springframework.remoting.rmi.JndiRmiClientInterceptor

All Implemented Interfaces:

Advice, Interceptor, MethodInterceptor, InitializingBean

Direct Known Subclasses:

JndiRmiProxyFactoryBean

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public class JndiRmiClientInterceptor
extends JndiObjectLocator
implements MethodInterceptor, InitializingBean

Interceptor for accessing RMI services from JNDI. Typically used for RMI-IIOP (CORBA), but can also be used for EJB home objects (for example, a Stateful Session Bean home). In contrast to a plain JNDI lookup, this accessor also performs narrowing through PortableRemoteObject.

With conventional RMI services, this invoker is typically used with the RMI service interface. Alternatively, this invoker can also proxy a remote RMI service with a matching non-RMI business interface, i.e. an interface that mirrors the RMI service methods but does not declare RemoteExceptions. In the latter case, RemoteExceptions thrown by the RMI stub will automatically get converted to Spring's unchecked RemoteAccessException.

The JNDI environment can be specified as "jndiEnvironment" property, or be configured in a jndi.properties file or as system properties. For example:

<property name="jndiEnvironment">
         <props>
                 <prop key="java.naming.factory.initial">com.sun.jndi.cosnaming.CNCtxFactory</prop>
                 <prop key="java.naming.provider.url">iiop://localhost:1050</prop>
         </props>
 </property>

Since:

1.1

Author:

Juergen Hoeller

See Also:

JndiAccessor.setJndiTemplate(org.springframework.jndi.JndiTemplate), JndiAccessor.setJndiEnvironment(java.util.Properties), JndiObjectLocator.setJndiName(java.lang.String), JndiRmiServiceExporter, JndiRmiProxyFactoryBean, RemoteAccessException, RemoteException, Remote, PortableRemoteObject.narrow(java.lang.Object, java.lang.Class)

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Field Summary

 

Fields inherited from class org.springframework.jndi.JndiLocatorSupport
CONTAINER_PREFIX

 

Fields inherited from class org.springframework.jndi.JndiAccessor
logger

 

Constructor Summary
JndiRmiClientInterceptor()

 

Method Summary
void	afterPropertiesSet()           Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
protected  RemoteInvocation	createRemoteInvocation(MethodInvocation methodInvocation)           Create a new RemoteInvocation object for the given AOP method invocation.
protected  Object	doInvoke(MethodInvocation invocation, Remote stub)           Perform the given invocation on the given RMI stub.
protected  Object	doInvoke(MethodInvocation methodInvocation, RmiInvocationHandler invocationHandler)           Apply the given AOP method invocation to the given RmiInvocationHandler.
RemoteInvocationFactory	getRemoteInvocationFactory()           Return the RemoteInvocationFactory used by this accessor.
Class	getServiceInterface()           Return the interface of the service to access.
protected  Remote	getStub()           Return the RMI stub to use.
Object	invoke(MethodInvocation invocation)           Fetches an RMI stub and delegates to doInvoke(org.aopalliance.intercept.MethodInvocation, java.rmi.Remote).
protected  boolean	isConnectFailure(RemoteException ex)           Determine whether the given RMI exception indicates a connect failure.
protected  boolean	isConnectFailure(SystemException ex)           Determine whether the given CORBA exception indicates a connect failure.
protected  Remote	lookupStub()           Create the RMI stub, typically by looking it up.
void	prepare()           Fetches the RMI stub on startup, if necessary.
protected  Object	refreshAndRetry(MethodInvocation invocation)           Refresh the RMI stub and retry the given invocation.
void	setCacheStub(boolean cacheStub)           Set whether to cache the RMI stub once it has been located.
void	setLookupStubOnStartup(boolean lookupStubOnStartup)           Set whether to look up the RMI stub on startup.
void	setRefreshStubOnConnectFailure(boolean refreshStubOnConnectFailure)           Set whether to refresh the RMI stub on connect failure.
void	setRemoteInvocationFactory(RemoteInvocationFactory remoteInvocationFactory)           Set the RemoteInvocationFactory to use for this accessor.
void	setServiceInterface(Class serviceInterface)           Set the interface of the service to access.

 

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

JndiRmiClientInterceptor

public JndiRmiClientInterceptor()

Method Detail

setServiceInterface

public void setServiceInterface(Class serviceInterface)

Set the interface of the service to access. The interface must be suitable for the particular service and remoting tool.

Typically required to be able to create a suitable service proxy, but can also be optional if the lookup returns a typed stub.

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getServiceInterface

public Class getServiceInterface()

Return the interface of the service to access.

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setRemoteInvocationFactory

public void setRemoteInvocationFactory(RemoteInvocationFactory remoteInvocationFactory)

Set the RemoteInvocationFactory to use for this accessor. Default is a DefaultRemoteInvocationFactory.

A custom invocation factory can add further context information to the invocation, for example user credentials.

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getRemoteInvocationFactory

public RemoteInvocationFactory getRemoteInvocationFactory()

Return the RemoteInvocationFactory used by this accessor.

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setLookupStubOnStartup

public void setLookupStubOnStartup(boolean lookupStubOnStartup)

Set whether to look up the RMI stub on startup. Default is "true".

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

See Also:

setCacheStub(boolean)

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setCacheStub

public void setCacheStub(boolean cacheStub)

Set whether to cache the RMI stub once it has been located. Default is "true".

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

See Also:

setLookupStubOnStartup(boolean)

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setRefreshStubOnConnectFailure

public void setRefreshStubOnConnectFailure(boolean refreshStubOnConnectFailure)

Set whether to refresh the RMI stub on connect failure. Default is "false".

Can be turned on to allow for hot restart of the RMI server. If a cached RMI stub throws an RMI exception that indicates a remote connect failure, a fresh proxy will be fetched and the invocation will be retried.

See Also:

ConnectException, ConnectIOException, NoSuchObjectException

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afterPropertiesSet

public void afterPropertiesSet()
                        throws NamingException

Description copied from interface: InitializingBean

Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

Specified by:

afterPropertiesSet in interface InitializingBean

Overrides:

afterPropertiesSet in class JndiObjectLocator

Throws:

NamingException

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prepare

public void prepare()
             throws NamingException,
                    RemoteLookupFailureException

Fetches the RMI stub on startup, if necessary.

Note: As of Spring 2.1, this method will always throw RemoteLookupFailureException and not declare NamingException anymore.

Throws:

NamingException - if the JNDI lookup failed

RemoteLookupFailureException - if RMI stub creation failed

See Also:

setLookupStubOnStartup(boolean), lookupStub()

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lookupStub

protected Remote lookupStub()
                     throws NamingException,
                            RemoteLookupFailureException

Create the RMI stub, typically by looking it up.

Called on interceptor initialization if "cacheStub" is "true"; else called for each invocation by getStub().

The default implementation retrieves the service from the JNDI environment. This can be overridden in subclasses.

Returns:

the RMI stub to store in this interceptor

Throws:

NamingException - if the JNDI lookup failed

RemoteLookupFailureException - if RMI stub creation failed

See Also:

setCacheStub(boolean), JndiObjectLocator.lookup()

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getStub

protected Remote getStub()
                  throws NamingException,
                         RemoteLookupFailureException

Return the RMI stub to use. Called for each invocation.

The default implementation returns the stub created on initialization, if any. Else, it invokes lookupStub() to get a new stub for each invocation. This can be overridden in subclasses, for example in order to cache a stub for a given amount of time before recreating it, or to test the stub whether it is still alive.

Returns:

the RMI stub to use for an invocation

Throws:

NamingException - if stub creation failed

RemoteLookupFailureException - if RMI stub creation failed

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invoke

public Object invoke(MethodInvocation invocation)
              throws Throwable

Fetches an RMI stub and delegates to doInvoke(org.aopalliance.intercept.MethodInvocation, java.rmi.Remote). If configured to refresh on connect failure, it will call refreshAndRetry(org.aopalliance.intercept.MethodInvocation) on corresponding RMI exceptions.

Specified by:

invoke in interface MethodInterceptor

Throws:

Throwable

See Also:

getStub(), doInvoke(org.aopalliance.intercept.MethodInvocation, java.rmi.Remote), refreshAndRetry(org.aopalliance.intercept.MethodInvocation), ConnectException, ConnectIOException, NoSuchObjectException

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isConnectFailure

protected boolean isConnectFailure(RemoteException ex)

Determine whether the given RMI exception indicates a connect failure.

The default implementation delegates to RmiClientInterceptorUtils.isConnectFailure(java.rmi.RemoteException).

Parameters:

ex - the RMI exception to check

Returns:

whether the exception should be treated as connect failure

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isConnectFailure

protected boolean isConnectFailure(SystemException ex)

Determine whether the given CORBA exception indicates a connect failure.

The default implementation checks for CORBA's OBJECT_NOT_EXIST exception.

Parameters:

ex - the RMI exception to check

Returns:

whether the exception should be treated as connect failure

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refreshAndRetry

protected Object refreshAndRetry(MethodInvocation invocation)
                          throws Throwable

Refresh the RMI stub and retry the given invocation. Called by invoke on connect failure.

Parameters:

invocation - the AOP method invocation

Returns:

the invocation result, if any

Throws:

Throwable - in case of invocation failure

See Also:

invoke(org.aopalliance.intercept.MethodInvocation)

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doInvoke

protected Object doInvoke(MethodInvocation invocation,
                          Remote stub)
                   throws Throwable

Perform the given invocation on the given RMI stub.

Parameters:

invocation - the AOP method invocation

stub - the RMI stub to invoke

Returns:

the invocation result, if any

Throws:

Throwable - in case of invocation failure

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doInvoke

protected Object doInvoke(MethodInvocation methodInvocation,
                          RmiInvocationHandler invocationHandler)
                   throws RemoteException,
                          NoSuchMethodException,
                          IllegalAccessException,
                          InvocationTargetException

Apply the given AOP method invocation to the given RmiInvocationHandler.

The default implementation delegates to createRemoteInvocation(org.aopalliance.intercept.MethodInvocation).

Parameters:

methodInvocation - the current AOP method invocation

invocationHandler - the RmiInvocationHandler to apply the invocation to

Returns:

the invocation result

Throws:

RemoteException - in case of communication errors

NoSuchMethodException - if the method name could not be resolved

IllegalAccessException - if the method could not be accessed

InvocationTargetException - if the method invocation resulted in an exception

See Also:

RemoteInvocation

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createRemoteInvocation

protected RemoteInvocation createRemoteInvocation(MethodInvocation methodInvocation)

Create a new RemoteInvocation object for the given AOP method invocation.

The default implementation delegates to the configured RemoteInvocationFactory. This can be overridden in subclasses in order to provide custom RemoteInvocation subclasses, containing additional invocation parameters (e.g. user credentials).

Note that it is preferable to build a custom RemoteInvocationFactory as a reusable strategy, instead of overriding this method.

Parameters:

methodInvocation - the current AOP method invocation

Returns:

the RemoteInvocation object

See Also:

RemoteInvocationFactory.createRemoteInvocation(org.aopalliance.intercept.MethodInvocation)

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