forked from mirrors/gecko-dev
63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 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 mozilla_dom_SessionStorageObserver_h
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#define mozilla_dom_SessionStorageObserver_h
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namespace mozilla {
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namespace dom {
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class SessionStorageObserverChild;
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/**
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* Effectively just a refcounted life-cycle management wrapper around
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* SessionStorageObserverChild which exists to receive chrome observer
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* notifications from the main process.
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*
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* ## Lifecycle ##
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* - Created by SessionStorageManager::SessionStorageManager. Placed in the
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* gSessionStorageObserver variable for subsequent SessionStorageManager's via
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* SessionStorageObserver::Get lookup.
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* - The SessionStorageObserverChild directly handles "Observe" messages,
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* shunting them directly to StorageObserver::Notify which distributes them to
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* individual observer sinks.
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* - Destroyed when refcount goes to zero due to all owning
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* SessionStorageManager being destroyed.
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*/
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class SessionStorageObserver final {
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friend class SessionStorageManager;
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SessionStorageObserverChild* mActor;
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public:
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static SessionStorageObserver* Get();
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NS_INLINE_DECL_REFCOUNTING(SessionStorageObserver)
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void AssertIsOnOwningThread() const {
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NS_ASSERT_OWNINGTHREAD(SessionStorageObserver);
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}
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void SetActor(SessionStorageObserverChild* aActor);
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void ClearActor() {
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AssertIsOnOwningThread();
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MOZ_ASSERT(mActor);
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mActor = nullptr;
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}
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private:
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// Only created by SessionStorageManager.
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SessionStorageObserver();
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~SessionStorageObserver();
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_SessionStorageObserver_h
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