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36c4c2abca
Depends on D145750 Differential Revision: https://phabricator.services.mozilla.com/D145751
69 lines
2.1 KiB
C++
69 lines
2.1 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_localstorage_LSObserver_h
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#define mozilla_dom_localstorage_LSObserver_h
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#include "mozilla/Assertions.h"
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#include "nsISupports.h"
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#include "nsString.h"
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namespace mozilla::dom {
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class LSObserverChild;
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/**
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* Effectively just a refcounted life-cycle management wrapper around
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* LSObserverChild which exists to receive "storage" event information from
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* other processes. (Same-process events are handled within the process, see
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* `LSObject::OnChange`.)
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*
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* ## Lifecycle ##
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* - Created by LSObject::EnsureObserver via synchronous LSRequest idiom
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* whenever the first window's origin adds a "storage" event. Placed in the
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* gLSObservers LSObserverHashtable for subsequent LSObject's via
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* LSObserver::Get lookup.
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* - The LSObserverChild directly handles "Observe" messages, shunting them
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* directly to Storage::NotifyChange which does all the legwork of notifying
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* windows about "storage" events.
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* - Destroyed when refcount goes to zero due to all owning LSObjects being
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* destroyed or having their `LSObject::DropObserver` methods invoked due to
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* the last "storage" event listener being removed from the owning window.
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*/
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class LSObserver final {
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friend class LSObject;
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LSObserverChild* mActor;
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const nsCString mOrigin;
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public:
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static LSObserver* Get(const nsACString& aOrigin);
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NS_INLINE_DECL_REFCOUNTING(LSObserver)
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void AssertIsOnOwningThread() const { NS_ASSERT_OWNINGTHREAD(LSObserver); }
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void SetActor(LSObserverChild* 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 LSObject.
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explicit LSObserver(const nsACString& aOrigin);
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~LSObserver();
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};
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} // namespace mozilla::dom
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#endif // mozilla_dom_localstorage_LSObserver_h
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