зеркало из https://github.com/mozilla/gecko-dev.git
83 строки
2.9 KiB
C++
83 строки
2.9 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_ServiceWorkerCloneData_h__
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#define mozilla_dom_ServiceWorkerCloneData_h__
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#include "mozilla/Assertions.h"
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#include "mozilla/dom/DOMTypes.h"
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#include "mozilla/dom/ipc/StructuredCloneData.h"
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#include "nsCOMPtr.h"
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#include "nsISupports.h"
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class nsISerialEventTarget;
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namespace mozilla {
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namespace ipc {
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class PBackgroundChild;
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class PBackgroundParent;
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} // namespace ipc
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namespace dom {
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class ClonedOrErrorMessageData;
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// Helper class used to pack structured clone data so that it can be
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// passed across thread and process boundaries. Currently the raw
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// StructuredCloneData and StructureCloneHolder APIs both make it
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// difficult to meet this needs directly. This helper class improves
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// the situation by:
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//
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// 1. Provides a ref-counted version of StructuredCloneData. We need
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// StructuredCloneData so we can serialize/deserialize across IPC.
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// The move constructor problems in StructuredCloneData (bug 1462676),
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// though, makes it hard to pass it around. Passing a ref-counted
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// pointer addresses this problem.
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// 2. Normally StructuredCloneData runs into problems if you try to move
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// it across thread boundaries because it releases its SharedJSAllocatedData
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// on the wrong thread. This helper will correctly proxy release the
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// shared data on the correct thread.
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//
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// This helper class should really just be used to serialize on one thread
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// and then move the reference across thread/process boundries to the
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// target worker thread. This class is not intended to support simultaneous
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// read/write operations from different threads at the same time.
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class ServiceWorkerCloneData final : public ipc::StructuredCloneData {
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nsCOMPtr<nsISerialEventTarget> mEventTarget;
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bool mIsErrorMessageData;
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~ServiceWorkerCloneData();
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public:
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ServiceWorkerCloneData();
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bool StealFromAndBuildClonedMessageDataForBackgroundParent(
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ClonedOrErrorMessageData& aFromClonedData,
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mozilla::ipc::PBackgroundParent* aParent,
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ClonedOrErrorMessageData& aToClonedData);
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bool BuildClonedMessageDataForBackgroundChild(
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mozilla::ipc::PBackgroundChild* aChild,
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ClonedOrErrorMessageData& aClonedData);
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void CopyFromClonedMessageDataForBackgroundParent(
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const ClonedOrErrorMessageData& aClonedData);
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void CopyFromClonedMessageDataForBackgroundChild(
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const ClonedOrErrorMessageData& aClonedData);
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void SetAsErrorMessageData();
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bool IsErrorMessageData() const;
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ServiceWorkerCloneData)
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_ServiceWorkerCloneData_h__
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