The Spring Framework

## 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

    public class JndiRmiClientInterceptor

extends JndiObjectLocator
implements MethodInterceptor, InitializingBean

`MethodInterceptor` 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)`

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, Object 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 Object` `getStub()` Return the RMI stub to use.
`Object` `invoke(MethodInvocation invocation)` Fetches an RMI stub and delegates to `doInvoke(org.aopalliance.intercept.MethodInvocation, java.lang.Object)`.
`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 Object` `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.

### getServiceInterface

    public Class getServiceInterface()

  Return the interface of the service to access.

### 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.

### getRemoteInvocationFactory

    public RemoteInvocationFactory getRemoteInvocationFactory()

  Return the RemoteInvocationFactory used by this accessor.

### 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)`

### 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)`

### 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`

### 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`

### prepare

    public void prepare()
                 throws RemoteLookupFailureException

  Fetches the RMI stub on startup, if necessary.

  Throws:
    `RemoteLookupFailureException` - if RMI stub creation failed
  See Also:
    `setLookupStubOnStartup(boolean)`, `lookupStub()`

### lookupStub

    protected Object lookupStub()
                         throws 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:
    `RemoteLookupFailureException` - if RMI stub creation failed
  See Also:
    `setCacheStub(boolean)`, `JndiObjectLocator.lookup()`

### getStub

    protected Object 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

### invoke

    public Object invoke(MethodInvocation invocation)
                  throws Throwable

  Fetches an RMI stub and delegates to `doInvoke(org.aopalliance.intercept.MethodInvocation, java.lang.Object)`. 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.lang.Object)`, `refreshAndRetry(org.aopalliance.intercept.MethodInvocation)`, `ConnectException`, `ConnectIOException`, `NoSuchObjectException`

### 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

### 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

### 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)`

### doInvoke

    protected Object doInvoke(MethodInvocation invocation,
                              Object 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

### 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`

### 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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