com.jaliansystems.activeMQLite.impl.RemoteInvocationHandler.java Source code

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Here is the source code for com.jaliansystems.activeMQLite.impl.RemoteInvocationHandler.java

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/*
 *   Copyright 2010 Jalian Systems Pvt. Ltd.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */
package com.jaliansystems.activeMQLite.impl;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * A Proxy invocation handler that wraps a remote object.
 * 
 * When a remote object is accessed a Proxy object is returned with an instance
 * of RemoteInvocationHandler. All the method invocations on the proxy instance
 * are seamlessly transferred to the remote connection.
 */
public class RemoteInvocationHandler implements InvocationHandler, IProxy {

    private static final Log log = LogFactory.getLog(RemoteInvocationHandler.class);

    private final ObjectHandle handle;
    private final RepositoryClient client;

    /**
     * Instantiates a new remote invocation handler.
     * 
     * @param handle
     *            the handle
     * @param client
     *            the client
     */
    public RemoteInvocationHandler(ObjectHandle handle, RepositoryClient client) {
        this.handle = handle;
        this.client = client;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.jaliansystems.jmslite.impl.IProxy#getHandle()
     */
    public ObjectHandle getHandle() {
        return handle;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.reflect.InvocationHandler#invoke(java.lang.Object,
     * java.lang.reflect.Method, java.lang.Object[])
     */
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        if (method.getName().equals("getHandle"))
            return getHandle();
        log.trace("RemoteInvocationHandler: invoking '" + method.getName() + "' on " + handle);
        return client.invoke(handle, method, args);
    }

    /**
     * When the object instance goes out of scope, at sometime JVM GC's this
     * object. We send a remove message to the remote connection. 
     */
    @Override
    protected void finalize() throws Throwable {
        client.remove(handle);
        super.finalize();
    }
}