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-/* RemoteObjectInvocationHandler.java -- RMI stub replacement.
- Copyright (C) 2005 Free Software Foundation, Inc.
-
- This file is part of GNU Classpath.
-
- GNU Classpath is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GNU Classpath is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU Classpath; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301 USA.
-
- Linking this library statically or dynamically with other modules is
- making a combined work based on this library. Thus, the terms and
- conditions of the GNU General Public License cover the whole
- combination.
-
- As a special exception, the copyright holders of this library give you
- permission to link this library with independent modules to produce an
- executable, regardless of the license terms of these independent
- modules, and to copy and distribute the resulting executable under
- terms of your choice, provided that you also meet, for each linked
- independent module, the terms and conditions of the license of that
- module. An independent module is a module which is not derived from
- or based on this library. If you modify this library, you may extend
- this exception to your version of the library, but you are not
- obligated to do so. If you do not wish to do so, delete this
- exception statement from your version. */
-
-
-package java.rmi.server;
-
-import gnu.java.rmi.server.RMIHashes;
-
-import java.io.Serializable;
-import java.lang.reflect.InvocationHandler;
-import java.lang.reflect.Method;
-import java.lang.reflect.Proxy;
-import java.rmi.Remote;
-import java.rmi.RemoteException;
-import java.rmi.UnexpectedException;
-import java.rmi.registry.Registry;
-import java.rmi.server.RemoteObject;
-import java.rmi.server.RemoteRef;
-import java.rmi.server.UnicastRemoteObject;
-import java.util.Hashtable;
-
-/**
- * Together with dynamic proxy instance, this class replaces the generated RMI
- * stub (*_Stub) classes that (following 1.5 specification) should be no longer
- * required. It is unusual to use the instances of this class directly in the
- * user program. Such instances are automatically created and returned by
- * {@link Registry} or {@link UnicastRemoteObject} methods if the remote
- * reference is known but the corresponding stub class is not accessible.
- *
- * @see Registry#lookup
- *
- * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
- */
-public class RemoteObjectInvocationHandler extends RemoteObject implements
- InvocationHandler, Remote, Serializable
-{
- /**
- * Use the jdk 1.5 SUID for interoperability.
- */
- static final long serialVersionUID = 2L;
-
- /**
- * The RMI method hash codes, computed once as described in the section 8.3
- * of the Java Remote Method Invocation (RMI) Specification.
- */
- static Hashtable methodHashCodes = new Hashtable();
-
- /**
- * The empty class array to define parameters of .hashCode and .toString.
- */
- static final Class[] noArgsC = new Class[0];
-
- /**
- * The class array to define parameters of .equals
- */
- static final Class[] anObjectC = new Class[] { Object.class };
-
- /**
- * The empty object array to replace null when no args are passed.
- */
- static final Object[] noArgs = new Object[0];
-
- /**
- * Construct the remote invocation handler that forwards calls to the given
- * remote object.
- *
- * @param reference the reference to the remote object where the method
- * calls should be forwarded.
- */
- public RemoteObjectInvocationHandler(RemoteRef reference)
- {
- super(reference);
- }
-
- /**
- * Invoke the remote method. When the known method is invoked on a created RMI
- * stub proxy class, the call is delivered to this method and then transferred
- * to the {@link RemoteRef#invoke(Remote, Method, Object[], long)} of the
- * remote reference that was passed in constructor. The methods are handled as
- * following:
- * <ul>
- * <li> The toString() method is delegated to the passed proxy instance.</li>
- * <li>The .equals method only returns true if the passed object is an
- * instance of proxy class and its invocation handler is equal to this
- * invocation handles.</li>
- * <li>The .hashCode returns the hashCode of this invocation handler (if the.</li>
- * <li>All other methods are converted to remote calls and forwarded to the
- * remote reference. </li>
- * </ul>
- *
- * @param proxyInstance
- * the instance of the proxy stub
- * @param method
- * the method being invoked
- * @param parameters
- * the method parameters
- * @return the method return value, returned by RemoteRef.invoke
- * @throws IllegalAccessException
- * if the passed proxy instance does not implement Remote interface.
- * @throws UnexpectedException
- * if remote call throws some exception, not listed in the
- * <code>throws</code> clause of the method being called.
- * @throws Throwable
- * that is thrown by remote call, if that exception is listend in
- * the <code>throws</code> clause of the method being called.
- */
- public Object invoke(Object proxyInstance, Method method, Object[] parameters)
- throws Throwable
- {
- if (!(proxyInstance instanceof Remote))
- {
- String name = proxyInstance == null ? "null"
- : proxyInstance.getClass().getName();
- throw new IllegalAccessException(name + " does not implement "
- + Remote.class.getName());
- }
-
- if (parameters == null)
- parameters = noArgs;
-
- String name = method.getName();
- switch (name.charAt(0))
- {
- case 'e':
- if (parameters.length == 1 && name.equals("equals")
- && method.getParameterTypes()[0].equals(Object.class))
- {
- if (parameters[0] instanceof Proxy)
- {
- Object handler = Proxy.getInvocationHandler(parameters[0]);
- if (handler == null)
- return Boolean.FALSE;
- else
- return handler.equals(this) ? Boolean.TRUE : Boolean.FALSE;
- }
- else
- return Boolean.FALSE;
- }
- break;
- case 'h':
- if (parameters.length == 0 && name.equals("hashCode"))
- {
- int hashC = Proxy.getInvocationHandler(proxyInstance).hashCode();
- return new Integer(hashC);
- }
- break;
- case 't':
- if (parameters.length == 0 && name.equals("toString"))
- return "Proxy stub:"+ref.remoteToString();
- break;
- default:
- break;
- }
-
- Long hash = (Long) methodHashCodes.get(method);
- if (hash == null)
- {
- hash = new Long(RMIHashes.getMethodHash(method));
- methodHashCodes.put(method, hash);
- }
-
- try
- {
- return getRef().invoke((Remote) proxyInstance, method, parameters,
- hash.longValue());
- }
- catch (RuntimeException exception)
- {
- // RuntimeException is always supported.
- throw exception;
- }
- catch (RemoteException exception)
- {
- // All remote methods can throw RemoteException.
- throw exception;
- }
- catch (Error exception)
- {
- throw exception;
- }
- catch (Exception exception)
- {
- Class[] exceptions = method.getExceptionTypes();
- Class exceptionClass = exception.getClass();
-
- for (int i = 0; i < exceptions.length; i++)
- {
- if (exceptions[i].equals(exceptionClass))
- throw exception;
- }
- throw new UnexpectedException(method.getName(), exception);
- }
- }
-
-}