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 //  The contents of this file are subject to the Mozilla Public License
 //  Version 1.1 (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.mozilla.org/MPL/
 //
 //  Software distributed under the License is distributed on an "AS IS"
 //  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 //  the License for the specific language governing rights and
 //  limitations under the License.
//
//  The Original Code is RabbitMQ.
//
//  The Initial Developer of the Original Code is VMware, Inc.
//  Copyright (c) 2007-2011 VMware, Inc.  All rights reserved.
//
package com.rabbitmq.client.impl;
public class ShutdownNotifierComponent implements ShutdownNotifier {

    
Monitor for shutdown listeners and shutdownCause
    private final Object monitor = new Object();

    
List of all shutdown listeners associated with the component
    private final List<ShutdownListenershutdownListeners = new ArrayList<ShutdownListener>();

    
When this value is null, the component is in an "open" state. When non-null, the component is in "closed" state, and this value indicates the circumstances of the shutdown.
    private volatile ShutdownSignalException shutdownCause = null;
    public void addShutdownListener(ShutdownListener listener)
    {
        ShutdownSignalException sse = null;
        synchronized(this.) {
            sse = this.;
            this..add(listener);
        }
        if (sse != null// closed
            listener.shutdownCompleted(sse);
    }
        synchronized(this.) {
            return this.;
        }
    }
    public void notifyListeners()
    {
        ShutdownSignalException sse = null;
        ShutdownListener[] sdls = null;
        synchronized(this.) {
            sdls = this.
                .toArray(new ShutdownListener[this..size()]);
            sse = this.;
        }
        for (ShutdownListener lsdls) {
            try {
                l.shutdownCompleted(sse);
            } catch (Exception e) {
            // FIXME: proper logging
            }
        }
    }
    public void removeShutdownListener(ShutdownListener listener)
    {
        synchronized(this.) {
            this..remove(listener);
        }
    }
    public boolean isOpen() {
        synchronized(this.) {
            return this. == null;
        }
    }
    public boolean setShutdownCauseIfOpen(ShutdownSignalException sse) {
        synchronized (this.) {
            if (isOpen()) {
                this. = sse;
                return true;
            }
            return false;
        }
    }
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