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// Copyright (c) 2012 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 REMOTING_PROTOCOL_MESSAGE_READER_H_
#define REMOTING_PROTOCOL_MESSAGE_READER_H_
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "remoting/base/compound_buffer.h"
#include "remoting/protocol/message_decoder.h"
namespace net {
class IOBuffer;
class Socket;
} // namespace net
namespace remoting {
namespace protocol {
// MessageReader reads data from the socket asynchronously and calls
// callback for each message it receives. It stops calling the
// callback as soon as the socket is closed, so the socket should
// always be closed before the callback handler is destroyed.
//
// In order to throttle the stream, MessageReader doesn't try to read
// new data from the socket until all previously received messages are
// processed by the receiver (|done_task| is called for each message).
// It is still possible that the MessageReceivedCallback is called
// twice (so that there is more than one outstanding message),
// e.g. when we the sender sends multiple messages in one TCP packet.
class MessageReader : public base::NonThreadSafe {
public:
typedef base::Callback<void(scoped_ptr<CompoundBuffer>, const base::Closure&)>
MessageReceivedCallback;
MessageReader();
virtual ~MessageReader();
// Sets the callback to be called for each incoming message.
void SetMessageReceivedCallback(const MessageReceivedCallback& callback);
// Starts reading from |socket|.
void StartReading(net::Socket* socket);
private:
void DoRead();
void OnRead(int result);
void HandleReadResult(int result);
void OnDataReceived(net::IOBuffer* data, int data_size);
void RunCallback(scoped_ptr<CompoundBuffer> message);
void OnMessageDone();
net::Socket* socket_;
// Set to true, when we have a socket read pending, and expecting
// OnRead() to be called when new data is received.
bool read_pending_;
// Number of messages that we received, but haven't finished
// processing yet, i.e. |done_task| hasn't been called for these
// messages.
int pending_messages_;
bool closed_;
scoped_refptr<net::IOBuffer> read_buffer_;
MessageDecoder message_decoder_;
// Callback is called when a message is received.
MessageReceivedCallback message_received_callback_;
base::WeakPtrFactory<MessageReader> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(MessageReader);
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_MESSAGE_READER_H_
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