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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_cache_StreamControl_h
#define mozilla_dom_cache_StreamControl_h
#include "mozilla/dom/cache/ReadStream.h"
#include "mozilla/dom/cache/Types.h"
#include "mozilla/RefPtr.h"
#include "nsTObserverArray.h"
struct nsID;
namespace mozilla::dom::cache {
class CacheReadStream;
// Abstract class to help implement the stream control Child and Parent actors.
// This provides an interface to partly help with serialization of IPC types,
// but also an implementation for tracking ReadStream objects.
class StreamControl {
public:
// abstract interface that must be implemented by child class
virtual void SerializeControl(CacheReadStream* aReadStreamOut) = 0;
virtual void SerializeStream(CacheReadStream* aReadStreamOut,
nsIInputStream* aStream) = 0;
virtual void OpenStream(const nsID& aId, InputStreamResolver&& aResolver) = 0;
// inherited implementation of the ReadStream::Controllable list
// Begin controlling the given ReadStream. This causes a strong ref to
// be held by the control. The ReadStream must call NoteClosed() or
// ForgetReadStream() to release this ref.
void AddReadStream(SafeRefPtr<ReadStream::Controllable> aReadStream);
// Forget the ReadStream without notifying the actor.
void ForgetReadStream(SafeRefPtr<ReadStream::Controllable> aReadStream);
// Forget the ReadStream and then notify the actor the stream is closed.
void NoteClosed(SafeRefPtr<ReadStream::Controllable> aReadStream,
const nsID& aId);
protected:
~StreamControl();
void CloseAllReadStreams();
void CloseAllReadStreamsWithoutReporting();
bool HasEverBeenRead() const;
// protected parts of the abstract interface
virtual void NoteClosedAfterForget(const nsID& aId) = 0;
#ifdef DEBUG
virtual void AssertOwningThread() = 0;
#else
void AssertOwningThread() {}
#endif
private:
// Hold strong references to ReadStream object. When the stream is closed
// it should call NoteClosed() or ForgetReadStream() to release this ref.
using ReadStreamList = nsTObserverArray<SafeRefPtr<ReadStream::Controllable>>;
ReadStreamList mReadStreamList;
};
} // namespace mozilla::dom::cache
#endif // mozilla_dom_cache_StreamControl_h
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