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74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 ts=8 et tw=80 : */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsOfflineObserver_h__
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#define nsOfflineObserver_h__
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#include "nsIObserver.h"
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namespace mozilla {
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namespace net {
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/**
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* Parents should extend this class and have a nsRefPtr<OfflineObserver> member.
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* The constructor should initialize the member to new OfflineObserver(this)
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* and the destructor should call RemoveObserver on the member.
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*
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* GetAppId and OfflineDisconnect are called from the default implementation
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* of OfflineNotification. These should be overridden by classes that don't
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* provide an implementation of OfflineNotification.
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*/
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class DisconnectableParent
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{
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public:
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// This is called on the main thread, by the OfflineObserver.
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// aSubject is of type nsAppOfflineInfo and contains appId and offline mode.
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virtual nsresult OfflineNotification(nsISupports *aSubject);
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// GetAppId returns the appId for the app associated with the parent
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virtual uint32_t GetAppId() = 0;
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// OfflineDisconnect cancels all existing connections in the parent when
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// the app becomes offline.
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virtual void OfflineDisconnect() { }
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};
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/**
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* This class observes the "network:app-offline-status-changed" topic and calls
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* OfflineNotification on the DisconnectableParent with the subject.
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*/
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class OfflineObserver
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: public nsIObserver
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{
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIOBSERVER
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public:
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// A nsRefPtr to this object should be kept by the disconnectable parent.
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explicit OfflineObserver(DisconnectableParent * parent);
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// This method needs to be called in the destructor of the parent
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// It removes the observer from the nsObserverService list, and it clears
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// the pointer it holds to the disconnectable parent.
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void RemoveObserver();
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private:
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// These methods are called to register and unregister the observer.
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// If they are called on the main thread they register the observer right
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// away, otherwise they dispatch and event to the main thread
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void RegisterOfflineObserver();
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void RemoveOfflineObserver();
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void RegisterOfflineObserverMainThread();
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void RemoveOfflineObserverMainThread();
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private:
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virtual ~OfflineObserver() { }
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DisconnectableParent * mParent;
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};
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} // net namespace
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} // mozilla namespace
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#endif // nsOfflineObserver_h__
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