eventhandler.java

实现了Jms的服务器源码,支持多种适配器,DB,FTP,支持多种数据库

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 *    above copyright notice, this list of conditions and the
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 *
 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
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 *
 * Copyright 2000,2003 (C) Exoffice Technologies Inc. All Rights Reserved.
 *
 * $Id: EventHandler.java,v 1.3 2003/08/17 01:32:22 tanderson Exp $
 *
 * Date         Author  Changes
 * 07/27/00	    jima    Created
 */

package org.exolab.jms.events;

import java.io.Serializable;

import org.exolab.core.foundation.HandleIfc;


/**
 * This class defines an object that receives event notification from an
 * {@link EventManager}. It also defines a method to return a
 * <code>HandleIfc</code> to the event handler, making it possible to be 
 * resolved at some future time (i.e across EventManager invocations)
 *
 * @version     $Revision: 1.3 $ $Date: 2003/08/17 01:32:22 $
 * @author      <a href="mailto:[e-mail]">Jim Alateras</a>
 * @see         EventManager
 * @see         Event
 */
public interface EventHandler
    extends Serializable {

    /**
     * Handle the specified event, generated by the {@link EventManager}.
     * The event handler pressumably knows how to handle the callback object
     * and should cast it appropriately before using it.
     * <p>
     * This methodshould not throw any exceptions
     *
     * @param       event           the event to handle
     * @param       callback        the callback object
     * @param       time            the absolute time, in ms, that the event
     *                              fired.
     */
    void handleEvent(int event, Object callback, long time);

    /**
     * Return a handle to this event handler for the purpose of storing and
     * restoring it. If you want event handlers to persist across subsequent
     * invocations of the {@link EventManager} then you must support this
     * method, otherwise this method can simply return null.
     *
     * @return      HandleIfc       return a reference to the handle.
     */
    HandleIfc getHandle();
}