callbackserviceimpl.java

一个java方面的消息订阅发送的源码

/**
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "Exolab" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Exoffice Technologies.  For written permission,
 *    please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
 *    permission of Exoffice Technologies. Exolab is a registered
 *    trademark of Exoffice Technologies.
 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2004 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: CallbackServiceImpl.java,v 1.1 2004/11/26 01:51:07 tanderson Exp $
 */
package org.exolab.jms.net;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;


/**
 * Service which allows clients to register a callback
 *
 * @version     $Revision: 1.1 $ $Date: 2004/11/26 01:51:07 $
 * @author      <a href="mailto:[e-mail]">Tim Anderson</a>
 */
public class CallbackServiceImpl implements CallbackService {

    /**
     * The set of callbacks
     */
    private List _callbacks = new ArrayList();

    /**
     * Register a callback
     *
     * @param callback the callback to register
     */
    public synchronized void addCallback(Callback callback) {
        _callbacks.add(callback);
    }

    /**
     * De-register a callback
     *
     * @param callback the callback to remove
     */
    public synchronized void removeCallback(Callback callback) {
        _callbacks.remove(callback);
    }

    /**
     * Returns a list of the registered callbacks
     *
     * @return a list of the registered callbacks
     */
    public synchronized List getCallbacks() {
        return _callbacks;
    }

    /**
     * Invokes each callback
     *
     * @param object the object to pass to the callback
     */
    public void invoke(Object object) {
        Iterator iterator = _callbacks.iterator();
        while (iterator.hasNext()) {
            Callback callback = (Callback) iterator.next();
            callback.invoke(object);
        }
    }

}