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* The Original Code is mozilla.org code.
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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
*/
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
* 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.
*/
/**
* 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.
*/
/**
* 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.
*/
/**
* enumerateObservers
*
* Returns an enumeration of all registered listeners.
*
* @param aTopic : The notification topic or subject.
*/
};