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97 lines
2.7 KiB
C++
97 lines
2.7 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_cache_StreamControl_h
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#define mozilla_dom_cache_StreamControl_h
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#include "mozilla/dom/cache/ReadStream.h"
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#include "mozilla/nsRefPtr.h"
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#include "nsTObserverArray.h"
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struct nsID;
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namespace mozilla {
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namespace ipc {
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class FileDescriptor;
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} // namespace ipc
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namespace dom {
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namespace cache {
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class CacheReadStream;
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// Abstract class to help implement the stream control Child and Parent actors.
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// This provides an interface to partly help with serialization of IPC types,
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// but also an implementation for tracking ReadStream objects.
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class StreamControl
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{
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public:
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// abstract interface that must be implemented by child class
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virtual void
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SerializeControl(CacheReadStream* aReadStreamOut) = 0;
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virtual void
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SerializeFds(CacheReadStream* aReadStreamOut,
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const nsTArray<mozilla::ipc::FileDescriptor>& aFds) = 0;
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virtual void
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DeserializeFds(const CacheReadStream& aReadStream,
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nsTArray<mozilla::ipc::FileDescriptor>& aFdsOut) = 0;
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// inherited implementation of the ReadStream::Controllable list
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// Begin controlling the given ReadStream. This causes a strong ref to
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// be held by the control. The ReadStream must call NoteClosed() or
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// ForgetReadStream() to release this ref.
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void
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AddReadStream(ReadStream::Controllable* aReadStream);
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// Forget the ReadStream without notifying the actor.
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void
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ForgetReadStream(ReadStream::Controllable* aReadStream);
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// Forget the ReadStream and then notify the actor the stream is closed.
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void
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NoteClosed(ReadStream::Controllable* aReadStream, const nsID& aId);
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protected:
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~StreamControl();
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void
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CloseReadStreams(const nsID& aId);
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void
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CloseAllReadStreams();
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void
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CloseAllReadStreamsWithoutReporting();
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bool
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HasEverBeenRead() const;
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// protected parts of the abstract interface
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virtual void
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NoteClosedAfterForget(const nsID& aId) = 0;
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#ifdef DEBUG
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virtual void
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AssertOwningThread() = 0;
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#else
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void AssertOwningThread() { }
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#endif
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private:
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// Hold strong references to ReadStream object. When the stream is closed
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// it should call NoteClosed() or ForgetReadStream() to release this ref.
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typedef nsTObserverArray<nsRefPtr<ReadStream::Controllable>> ReadStreamList;
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ReadStreamList mReadStreamList;
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};
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} // namespace cache
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_cache_StreamControl_h
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