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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) 2007-2012 VMware, Inc.  All rights reserved.
//
package com.rabbitmq.client;

Interface for components that are shutdown capable and that allow listeners to be added for shutdown signals

public interface ShutdownNotifier {
    
Add shutdown listener. If the component is already closed, handler is fired immediately

Parameters:
listener ShutdownListener to the component
    public void addShutdownListener(ShutdownListener listener);

    
Remove shutdown listener for the component.

Parameters:
listener ShutdownListener to be removed
    public void removeShutdownListener(ShutdownListener listener);

    
Get the shutdown reason object

Returns:
ShutdownSignalException if component is closed, null otherwise
    public ShutdownSignalException getCloseReason();

    
Protected API - notify the listeners attached to the component

    public void notifyListeners();

    
Determine whether the component is currently open. Will return false if we are currently closing. Checking this method should be only for information, because of the race conditions - state can change after the call. Instead just execute and try to catch ShutdownSignalException and IOException

Returns:
true when component is open, false otherwise
    boolean isOpen();
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