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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_CHILD_SHARED_MEMORY_DATA_CONSUMER_HANDLE_H_
#define CONTENT_CHILD_SHARED_MEMORY_DATA_CONSUMER_HANDLE_H_
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "content/common/content_export.h"
#include "content/public/child/request_peer.h"
#include "third_party/WebKit/public/platform/WebDataConsumerHandle.h"
namespace content {
// This class is a WebDataConsumerHandle that accepts RequestPeer::ReceivedData.
class CONTENT_EXPORT SharedMemoryDataConsumerHandle final
: public NON_EXPORTED_BASE(blink::WebDataConsumerHandle) {
private:
class Context;
public:
enum BackpressureMode {
kApplyBackpressure,
kDoNotApplyBackpressure,
};
class CONTENT_EXPORT Writer final {
public:
Writer(const scoped_refptr<Context>& context, BackpressureMode mode);
~Writer();
// Note: Writer assumes |AddData| is not called in a client's didGetReadable
// callback. There isn't such assumption for |Close| and |Fail|.
void AddData(scoped_ptr<RequestPeer::ReceivedData> data);
void Close();
// TODO(yhirano): Consider providing error code.
void Fail();
private:
scoped_refptr<Context> context_;
BackpressureMode mode_;
DISALLOW_COPY_AND_ASSIGN(Writer);
};
class ReaderImpl final : public Reader {
public:
ReaderImpl(scoped_refptr<Context> context, Client* client);
~ReaderImpl() override;
Result read(void* data,
size_t size,
Flags flags,
size_t* readSize) override;
Result beginRead(const void** buffer,
Flags flags,
size_t* available) override;
Result endRead(size_t readSize) override;
private:
scoped_refptr<Context> context_;
DISALLOW_COPY_AND_ASSIGN(ReaderImpl);
};
// Creates a handle and a writer associated with the handle. The created
// writer should be used on the calling thread.
SharedMemoryDataConsumerHandle(BackpressureMode mode,
scoped_ptr<Writer>* writer);
// |on_reader_detached| will be called aynchronously on the calling thread
// when the reader (including the handle) is detached (i.e. both the handle
// and the reader are destructed). The callback will be reset in the internal
// context when the writer is detached, i.e. |Close| or |Fail| is called,
// and the callback will never be called.
SharedMemoryDataConsumerHandle(BackpressureMode mode,
const base::Closure& on_reader_detached,
scoped_ptr<Writer>* writer);
~SharedMemoryDataConsumerHandle() override;
scoped_ptr<Reader> ObtainReader(Client* client);
private:
ReaderImpl* obtainReaderInternal(Client* client) override;
const char* debugName() const override;
scoped_refptr<Context> context_;
DISALLOW_COPY_AND_ASSIGN(SharedMemoryDataConsumerHandle);
};
} // namespace content
#endif // CONTENT_CHILD_SHARED_MEMORY_DATA_CONSUMER_HANDLE_H_
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