RemoteObjectInvocationHandler (Java Platform SE 8 ) (original) (raw)

• java.lang.Object

• • java.rmi.server.RemoteObject
  • • java.rmi.server.RemoteObjectInvocationHandler

• All Implemented Interfaces:
  Serializable, InvocationHandler, Remote

public class RemoteObjectInvocationHandler
extends RemoteObject
implements InvocationHandler
An implementation of the InvocationHandler interface for use with Java Remote Method Invocation (Java RMI). This invocation handler can be used in conjunction with a dynamic proxy instance as a replacement for a pregenerated stub class.
Applications are not expected to use this class directly. A remote object exported to use a dynamic proxy with UnicastRemoteObject or Activatable has an instance of this class as that proxy's invocation handler.
Since:
1.5
See Also:
Serialized Form

• • Field Summary

     * ### Fields inherited from class java.rmi.server.[RemoteObject](../../../java/rmi/server/RemoteObject.html "class in java.rmi.server")  
     `[ref](../../../java/rmi/server/RemoteObject.html#ref)`  

  • Constructor Summary

  Constructors

  Constructor	Description
  RemoteObjectInvocationHandler(RemoteRef ref)	Creates a new RemoteObjectInvocationHandler constructed with the specified RemoteRef.

  • Method Summary

  All Methods Instance Methods Concrete Methods

  Modifier and Type	Method	Description
  Object	invoke(Object proxy,Method method,Object[] args)	Processes a method invocation made on the encapsulating proxy instance, proxy, and returns the result.

     * ### Methods inherited from class java.rmi.server.[RemoteObject](../../../java/rmi/server/RemoteObject.html "class in java.rmi.server")  
     `[equals](../../../java/rmi/server/RemoteObject.html#equals-java.lang.Object-), [getRef](../../../java/rmi/server/RemoteObject.html#getRef--), [hashCode](../../../java/rmi/server/RemoteObject.html#hashCode--), [toString](../../../java/rmi/server/RemoteObject.html#toString--), [toStub](../../../java/rmi/server/RemoteObject.html#toStub-java.rmi.Remote-)`  
     * ### Methods inherited from class java.lang.[Object](../../../java/lang/Object.html "class in java.lang")  
     `[clone](../../../java/lang/Object.html#clone--), [finalize](../../../java/lang/Object.html#finalize--), [getClass](../../../java/lang/Object.html#getClass--), [notify](../../../java/lang/Object.html#notify--), [notifyAll](../../../java/lang/Object.html#notifyAll--), [wait](../../../java/lang/Object.html#wait--), [wait](../../../java/lang/Object.html#wait-long-), [wait](../../../java/lang/Object.html#wait-long-int-)`

• • Constructor Detail

     * #### RemoteObjectInvocationHandler  
     public RemoteObjectInvocationHandler([RemoteRef](../../../java/rmi/server/RemoteRef.html "interface in java.rmi.server") ref)  
     Creates a new `RemoteObjectInvocationHandler` constructed with the specified `RemoteRef`.  
     Parameters:  
     `ref` \- the remote ref  
     Throws:  
     `[NullPointerException](../../../java/lang/NullPointerException.html "class in java.lang")` \- if `ref` is `null`  

  • Method Detail

    * #### invoke  
    public [Object](../../../java/lang/Object.html "class in java.lang") invoke([Object](../../../java/lang/Object.html "class in java.lang") proxy,  
                         [Method](../../../java/lang/reflect/Method.html "class in java.lang.reflect") method,  
                         [Object](../../../java/lang/Object.html "class in java.lang")[] args)  
                  throws [Throwable](../../../java/lang/Throwable.html "class in java.lang")  
    Processes a method invocation made on the encapsulating proxy instance, `proxy`, and returns the result.  
    `RemoteObjectInvocationHandler` implements this method as follows:  
    If `method` is one of the following methods, it is processed as described below:  
             * [Object.hashCode](../../../java/lang/Object.html#hashCode--): Returns the hash code value for the proxy.  
             * [Object.equals](../../../java/lang/Object.html#equals-java.lang.Object-): Returns `true` if the argument (`args[0]`) is an instance of a dynamic proxy class and this invocation handler is equal to the invocation handler of that argument, and returns `false` otherwise.  
             * [Object.toString](../../../java/lang/Object.html#toString--): Returns a string representation of the proxy.  
    Otherwise, a remote call is made as follows:  
             * If `proxy` is not an instance of the interface[Remote](../../../java/rmi/Remote.html "interface in java.rmi"), then an [IllegalArgumentException](../../../java/lang/IllegalArgumentException.html "class in java.lang") is thrown.  
             * Otherwise, the [invoke](../../../java/rmi/server/RemoteRef.html#invoke-java.rmi.Remote-java.lang.reflect.Method-java.lang.Object:A-long-) method is invoked on this invocation handler's `RemoteRef`, passing`proxy`, `method`, `args`, and the method hash (defined in section 8.3 of the "Java Remote Method Invocation (RMI) Specification") for `method`, and the result is returned.  
             * If an exception is thrown by `RemoteRef.invoke` and that exception is a checked exception that is not assignable to any exception in the `throws` clause of the method implemented by the `proxy`'s class, then that exception is wrapped in an [UnexpectedException](../../../java/rmi/UnexpectedException.html "class in java.rmi") and the wrapped exception is thrown. Otherwise, the exception thrown by`invoke` is thrown by this method.  
    The semantics of this method are unspecified if the arguments could not have been produced by an instance of some valid dynamic proxy class containing this invocation handler.  
    Specified by:  
    `[invoke](../../../java/lang/reflect/InvocationHandler.html#invoke-java.lang.Object-java.lang.reflect.Method-java.lang.Object:A-)` in interface `[InvocationHandler](../../../java/lang/reflect/InvocationHandler.html "interface in java.lang.reflect")`  
    Parameters:  
    `proxy` \- the proxy instance that the method was invoked on  
    `method` \- the `Method` instance corresponding to the interface method invoked on the proxy instance  
    `args` \- an array of objects containing the values of the arguments passed in the method invocation on the proxy instance, or`null` if the method takes no arguments  
    Returns:  
    the value to return from the method invocation on the proxy instance  
    Throws:  
    `[Throwable](../../../java/lang/Throwable.html "class in java.lang")` \- the exception to throw from the method invocation on the proxy instance  
    See Also:  
    [UndeclaredThrowableException](../../../java/lang/reflect/UndeclaredThrowableException.html "class in java.lang.reflect")

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