mirror of
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120 lines
3.6 KiB
C++
120 lines
3.6 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_ReadStream_h
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#define mozilla_dom_cache_ReadStream_h
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#include "mozilla/ipc/FileDescriptor.h"
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#include "nsCOMPtr.h"
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#include "nsID.h"
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#include "nsIInputStream.h"
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#include "nsISupportsImpl.h"
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#include "mozilla/RefPtr.h"
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#include "nsTArrayForwardDeclare.h"
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namespace mozilla {
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namespace ipc {
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class AutoIPCStream;
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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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class CacheReadStreamOrVoid;
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class PCacheStreamControlParent;
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// IID for the dom::cache::ReadStream interface
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#define NS_DOM_CACHE_READSTREAM_IID \
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{0x8e5da7c9, 0x0940, 0x4f1d, \
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{0x97, 0x25, 0x5c, 0x59, 0x38, 0xdd, 0xb9, 0x9f}}
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// Custom stream class for Request and Response bodies being read from
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// a Cache. The main purpose of this class is to report back to the
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// Cache's Manager when the stream is closed. This allows the Cache to
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// accurately determine when the underlying body file can be deleted,
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// etc.
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//
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// The ReadStream class also provides us with a convenient QI'able
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// interface that we can use to pass additional meta-data with the
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// stream channel. For example, Cache.put() can detect that the content
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// script is passing a Cache-originated-stream back into the Cache
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// again. This enables certain optimizations.
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class ReadStream final : public nsIInputStream
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{
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public:
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// Interface that lets the StreamControl classes interact with
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// our private inner stream.
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class Controllable
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{
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public:
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// Closes the stream, notifies the stream control, and then forgets
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// the stream control.
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virtual void
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CloseStream() = 0;
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// Closes the stream and then forgets the stream control. Does not
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// notify.
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virtual void
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CloseStreamWithoutReporting() = 0;
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virtual bool
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MatchId(const nsID& aId) const = 0;
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virtual bool
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HasEverBeenRead() const = 0;
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NS_IMETHOD_(MozExternalRefCountType)
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AddRef(void) = 0;
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NS_IMETHOD_(MozExternalRefCountType)
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Release(void) = 0;
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};
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static already_AddRefed<ReadStream>
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Create(const CacheReadStreamOrVoid& aReadStreamOrVoid);
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static already_AddRefed<ReadStream>
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Create(const CacheReadStream& aReadStream);
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static already_AddRefed<ReadStream>
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Create(PCacheStreamControlParent* aControl, const nsID& aId,
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nsIInputStream* aStream);
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void Serialize(CacheReadStreamOrVoid* aReadStreamOut,
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nsTArray<UniquePtr<mozilla::ipc::AutoIPCStream>>& aStreamCleanupList,
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ErrorResult& aRv);
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void Serialize(CacheReadStream* aReadStreamOut,
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nsTArray<UniquePtr<mozilla::ipc::AutoIPCStream>>& aStreamCleanupList,
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ErrorResult& aRv);
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private:
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class Inner;
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explicit ReadStream(Inner* aInner);
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~ReadStream();
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// Hold a strong ref to an inner class that actually implements the
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// majority of the stream logic. Before releasing this ref the outer
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// ReadStream guarantees it will call Close() on the inner stream.
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// This is essential for the inner stream to avoid dealing with the
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// implicit close that can happen when a stream is destroyed.
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RefPtr<Inner> mInner;
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_DOM_CACHE_READSTREAM_IID);
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(ReadStream, NS_DOM_CACHE_READSTREAM_IID);
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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_ReadStream_h
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