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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.remoting.rmi 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.springframework.remoting.support.RemoteInvocationBasedAccessor
   org.springframework.remoting.rmi.RmiClientInterceptor

All known Subclasses:   org.springframework.remoting.rmi.RmiProxyFactoryBean,
RmiClientInterceptor
public class RmiClientInterceptor extends RemoteInvocationBasedAccessor implements MethodInterceptor(Code)
org.aopalliance.intercept.MethodInterceptor for accessing conventional RMI services or RMI invokers. The service URL must be a valid RMI URL (e.g. "rmi://localhost:1099/myservice").

RMI invokers work at the RmiInvocationHandler level, needing only one stub for any service. Service interfaces do not have to extend java.rmi.Remote or throw java.rmi.RemoteException. Spring's unchecked RemoteAccessException will be thrown on remote invocation failure. Of course, in and out parameters have to be serializable.

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.
author:
   Juergen Hoeller
since:
   29.09.2003
See Also:   RmiServiceExporter
See Also:   RmiProxyFactoryBean
See Also:   RmiInvocationHandler
See Also:   org.springframework.remoting.RemoteAccessException
See Also:   java.rmi.RemoteException
See Also:   java.rmi.Remote





Method Summary
public  voidafterPropertiesSet()
    
protected  ObjectdoInvoke(MethodInvocation invocation, Remote stub)
     Perform the given invocation on the given RMI stub.
protected  ObjectdoInvoke(MethodInvocation methodInvocation, RmiInvocationHandler invocationHandler)
     Apply the given AOP method invocation to the given RmiInvocationHandler .
protected  RemotegetStub()
     Return the RMI stub to use.
public  Objectinvoke(MethodInvocation invocation)
     Fetches an RMI stub and delegates to doInvoke.
protected  booleanisConnectFailure(RemoteException ex)
     Determine whether the given RMI exception indicates a connect failure.
protected  RemotelookupStub()
     Create the RMI stub, typically by looking it up.

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

The default implementation looks up the service URL via java.rmi.Naming.

public  voidprepare()
     Fetches RMI stub on startup, if necessary.
protected  ObjectrefreshAndRetry(MethodInvocation invocation)
     Refresh the RMI stub and retry the given invocation.
public  voidsetCacheStub(boolean cacheStub)
     Set whether to cache the RMI stub once it has been located.
public  voidsetLookupStubOnStartup(boolean lookupStubOnStartup)
     Set whether to look up the RMI stub on startup.
public  voidsetRefreshStubOnConnectFailure(boolean refreshStubOnConnectFailure)
     Set whether to refresh the RMI stub on connect failure.
public  voidsetRegistryClientSocketFactory(RMIClientSocketFactory registryClientSocketFactory)
     Set a custom RMI client socket factory to use for accessing the RMI registry.



Method Detail
afterPropertiesSet
public void afterPropertiesSet()(Code)



doInvoke
protected Object doInvoke(MethodInvocation invocation, Remote stub) throws Throwable(Code)
Perform the given invocation on the given RMI stub.
Parameters:
  invocation - the AOP method invocation
Parameters:
  stub - the RMI stub to invoke the invocation result, if any
throws:
  Throwable - in case of invocation failure



doInvoke
protected Object doInvoke(MethodInvocation methodInvocation, RmiInvocationHandler invocationHandler) throws RemoteException, NoSuchMethodException, IllegalAccessException, InvocationTargetException(Code)
Apply the given AOP method invocation to the given RmiInvocationHandler .

The default implementation delegates to RmiClientInterceptor.createRemoteInvocation .
Parameters:
  methodInvocation - the current AOP method invocation
Parameters:
  invocationHandler - the RmiInvocationHandler to apply the invocation to the invocation result
throws:
  RemoteException - in case of communication errors
throws:
  NoSuchMethodException - if the method name could not be resolved
throws:
  IllegalAccessException - if the method could not be accessed
throws:
  InvocationTargetException - if the method invocation resulted in an exception
See Also:   org.springframework.remoting.support.RemoteInvocation




getStub
protected Remote getStub() throws RemoteLookupFailureException(Code)
Return the RMI stub to use. Called for each invocation.

The default implementation returns the stub created on initialization, if any. Else, it invokes RmiClientInterceptor.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. the RMI stub to use for an invocation
throws:
  RemoteLookupFailureException - if RMI stub creation failed
See Also:   RmiClientInterceptor.lookupStub




invoke
public Object invoke(MethodInvocation invocation) throws Throwable(Code)
Fetches an RMI stub and delegates to doInvoke. If configured to refresh on connect failure, it will call RmiClientInterceptor.refreshAndRetry on corresponding RMI exceptions.
See Also:   RmiClientInterceptor.getStub
See Also:   RmiClientInterceptor.doInvoke(MethodInvocation,Remote)
See Also:   RmiClientInterceptor.refreshAndRetry
See Also:   java.rmi.ConnectException
See Also:   java.rmi.ConnectIOException
See Also:   java.rmi.NoSuchObjectException



isConnectFailure
protected boolean isConnectFailure(RemoteException ex)(Code)
Determine whether the given RMI exception indicates a connect failure.

The default implementation delegates to RmiClientInterceptorUtils.isConnectFailure .
Parameters:
  ex - the RMI exception to check whether the exception should be treated as connect failure




lookupStub
protected Remote lookupStub() throws RemoteLookupFailureException(Code)
Create the RMI stub, typically by looking it up.

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

The default implementation looks up the service URL via java.rmi.Naming. This can be overridden in subclasses. the RMI stub to store in this interceptor
throws:
  RemoteLookupFailureException - if RMI stub creation failed
See Also:   RmiClientInterceptor.setCacheStub
See Also:   java.rmi.Naming.lookup




prepare
public void prepare() throws RemoteLookupFailureException(Code)
Fetches RMI stub on startup, if necessary.
throws:
  RemoteLookupFailureException - if RMI stub creation failed
See Also:   RmiClientInterceptor.setLookupStubOnStartup
See Also:   RmiClientInterceptor.lookupStub



refreshAndRetry
protected Object refreshAndRetry(MethodInvocation invocation) throws Throwable(Code)
Refresh the RMI stub and retry the given invocation. Called by invoke on connect failure.
Parameters:
  invocation - the AOP method invocation the invocation result, if any
throws:
  Throwable - in case of invocation failure
See Also:   RmiClientInterceptor.invoke



setCacheStub
public void setCacheStub(boolean cacheStub)(Code)
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:   RmiClientInterceptor.setLookupStubOnStartup




setLookupStubOnStartup
public void setLookupStubOnStartup(boolean lookupStubOnStartup)(Code)
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:   RmiClientInterceptor.setCacheStub




setRefreshStubOnConnectFailure
public void setRefreshStubOnConnectFailure(boolean refreshStubOnConnectFailure)(Code)
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:   java.rmi.ConnectException
See Also:   java.rmi.ConnectIOException
See Also:   java.rmi.NoSuchObjectException




setRegistryClientSocketFactory
public void setRegistryClientSocketFactory(RMIClientSocketFactory registryClientSocketFactory)(Code)
Set a custom RMI client socket factory to use for accessing the RMI registry.
See Also:   java.rmi.server.RMIClientSocketFactory
See Also:   java.rmi.registry.LocateRegistry.getRegistry(StringintRMIClientSocketFactory)



Methods inherited from org.springframework.remoting.support.RemoteInvocationBasedAccessor
protected RemoteInvocation createRemoteInvocation(MethodInvocation methodInvocation)(Code)(Java Doc)
public RemoteInvocationFactory getRemoteInvocationFactory()(Code)(Java Doc)
protected Object recreateRemoteInvocationResult(RemoteInvocationResult result) throws Throwable(Code)(Java Doc)
public void setRemoteInvocationFactory(RemoteInvocationFactory remoteInvocationFactory)(Code)(Java Doc)

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