marshalledinvocation.java

OpenJMS是一个开源的Java Message Service API 1.0.2 规范的实现,它包含有以下特性： *. 它既支持点到点（point-to-point）（PTP）模型和发布/订

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 *    please contact [e-mail].
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 * 5. Due credit should be given to the Exolab Project
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 *
 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
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 *
 * Copyright 2005 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: MarshalledInvocation.java,v 1.2 2005/07/22 23:40:36 tanderson Exp $
 */

package org.exolab.jms.net.connector;

import java.io.IOException;
import java.rmi.MarshalledObject;

import EDU.oswego.cs.dl.util.concurrent.Latch;


/**
 * An <code>Invocation</code> where the {@link Request} is wrapped
 * in an {@link MarshalledObject}.
 *
 * @author <a href="mailto:[e-mail]">Tim Anderson</a>
 * @version $Revision: 1.2 $ $Date: 2005/07/22 23:40:36 $
 */
public class MarshalledInvocation implements Invocation {

    /**
     * The marshalled {@link Request} instance.
     */
    private final MarshalledObject _request;

    /**
     * The result of the invocation.
     */
    private Response _response;

    /**
     * The caller performing the invocation.
     */
    private final Caller _caller;

    /**
     * Latch to force clients to wait until the invocation is complete.
     */
    private final Latch _latch = new Latch();


    /**
     * Construct a new <code>MarshalledInvocation</code>.
     *
     * @param request the marshalled {@link Request} instance
     * @param caller  the caller performing the invocation
     */
    public MarshalledInvocation(MarshalledObject request, Caller caller) {
        _request = request;
        _caller = caller;
    }

    /**
     * Returns the request.
     *
     * @return the request
     * @throws Throwable for any error
     */
    public Request getRequest() throws Throwable {
        return (Request) _request.get();
    }

    /**
     * Returns the caller performing the invocation.
     *
     * @return the caller
     */
    public Caller getCaller() {
        return _caller;
    }

    /**
     * Sets the result of the invocation.
     *
     * @param response the result
     */
    public void setResponse(Response response) {
        _response = response;
        _latch.release();
    }

    /**
     * Returns the result of the invocation.
     *
     * @return the result of the invocation.
     * @throws InterruptedException if interrupted
     */
    public Response getResponse() throws InterruptedException {
        _latch.acquire();
        return _response;
    }

    /**
     * Returns the result of the invocation, wrapped in a {@link
     * MarshalledObject}.
     *
     * @return the result of the invocation.
     * @throws IOException if the response can't be marshalld
     * @throws InterruptedException if interrupted
     */
    public MarshalledObject getMarshalledResponse()
            throws IOException, InterruptedException {
        return new MarshalledObject(getResponse());
    }

}