Module java.rmi
Package java.rmi.server

Class RemoteObjectInvocationHandler

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 has an instance of this class as that proxy's invocation handler.

Since:
1.5
See Also:

  • Constructor Details

    • RemoteObjectInvocationHandler

      public RemoteObjectInvocationHandler(RemoteRef ref)
      Creates a new RemoteObjectInvocationHandler constructed with the specified RemoteRef.
      Parameters:
      ref - the remote ref
      Throws:
      NullPointerException - if ref is null

  • Method Details

    • invoke

      public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
      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: Returns the hash code value for the proxy.
      • Object.equals: 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: Returns a string representation of the proxy.

      If method overrides Object.finalize, it is ignored.

      Otherwise, a remote call is made as follows:

      • If proxy is not an instance of the interface Remote, then an IllegalArgumentException is thrown.
      • Otherwise, the invoke 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 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 in interface InvocationHandler
      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 - the exception to throw from the method invocation on the proxy instance
      See Also: