gecko-dev/xpcom/ds/nsIObserverService.idl

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
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*
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* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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#include "nsISupports.idl"
interface nsIObserver;
interface nsISimpleEnumerator;
/**
* nsIObserverService
*
* Service allows a client listener (nsIObserver) to register and unregister for
* notifications of specific string referenced topic. Service also provides a
* way to notify registered listeners and a way to enumerate registered client
* listeners.
*
* @status FROZEN
*/
[scriptable, uuid(D07F5192-E3D1-11d2-8ACD-00105A1B8860)]
interface nsIObserverService : nsISupports
{
/**
* AddObserver
*
* Registers a given listener for a notifications regarding the specified
* topic.
*
* @param anObserve : The interface pointer which will receive notifications.
* @param aTopic : The notification topic or subject.
* @param ownsWeak : If set to false, the nsIObserverService will hold a
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* strong reference to |anObserver|. If set to true and
* |anObserver| supports the nsIWeakReference interface,
* a weak reference will be held. Otherwise an error will be
* returned.
*/
void addObserver( in nsIObserver anObserver, in string aTopic, in boolean ownsWeak);
/**
* removeObserver
*
* Unregisters a given listener from notifications regarding the specified
* topic.
*
* @param anObserver : The interface pointer which will stop recieving
* notifications.
* @param aTopic : The notification topic or subject.
*/
void removeObserver( in nsIObserver anObserver, in string aTopic );
/**
* notifyObservers
*
* Notifies all registered listeners of the given topic.
*
* @param aSubject : Notification specific interface pointer.
* @param aTopic : The notification topic or subject.
* @param someData : Notification specific wide string.
*/
void notifyObservers( in nsISupports aSubject,
in string aTopic,
in wstring someData );
/**
* enumerateObservers
*
* Returns an enumeration of all registered listeners.
*
* @param aTopic : The notification topic or subject.
*/
nsISimpleEnumerator enumerateObservers( in string aTopic );
};