errorhandlerbroker.java

spam source codejasen-0.9jASEN - java Anti Spam ENgine.zip 如标题所示

/*
 * @(#)ErrorHandlerBroker.java	5/11/2004
 *
 * Copyright (c) 2004, 2005  jASEN.org
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *
 *   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 names of the authors may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 *   4. Any modification or additions to the software must be contributed back
 *      to the project.
 *
 *   5. Any investigation or reverse engineering of source code or binary to
 *      enable emails to bypass the filters, and hence inflict spam and or viruses
 *      onto users who use or do not use jASEN could subject the perpetrator to
 *      criminal and or civil liability.
 *
 * THIS SOFTWARE IS PROVIDED "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 JASEN.ORG,
 * OR ANY CONTRIBUTORS TO THIS SOFTWARE 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.
 *
 */
package org.jasen.error;

import org.jasen.interfaces.JasenErrorHandler;

/**
 * <P>
 * 	Singleton class which provides application-wide access to the engine error handler.
 * </P>
 * @author Jason Polites
 */
public final class ErrorHandlerBroker
{
    private static ErrorHandlerBroker instance;
    private static final Object lock = new Object();

    private JasenErrorHandler errorHandler;

    /**
     *
     */
    private ErrorHandlerBroker() {
        super ();
    }

    /**
     * Gets the single (per JVM) error handler instance
     * @return The current error handler broker instance
     */
    public static final ErrorHandlerBroker getInstance() {
        if(instance == null) {
            synchronized(lock) {
                if(instance == null) {
                    instance = new ErrorHandlerBroker();
                }

                lock.notifyAll();
            }
        }

        return instance;
    }

    /**
     * Gets the current application-wide error handler
     * @return The current (only) error handler
     */
    public JasenErrorHandler getErrorHandler() {
        if(errorHandler == null) {
            synchronized(this) {
                if(errorHandler == null) {
                    errorHandler = new SystemErrorHandler();
                }
                notifyAll();
            }
        }

        return errorHandler;
    }

    /**
     * Sets  true if the message could not be parsed, false otherwise
     * @param handler The current (only) error handler
     */
    public void setErrorHandler(JasenErrorHandler handler) {
        this.errorHandler = handler;
    }

}