text: // 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 JINGLE_GLUE_CHANNEL_SOCKET_ADAPTER_H_
  #define JINGLE_GLUE_CHANNEL_SOCKET_ADAPTER_H_
  
  #include "base/callback_forward.h"
  #include "base/compiler_specific.h"
  #include "net/socket/socket.h"
  #include "third_party/libjingle/source/talk/base/asyncpacketsocket.h"
  #include "third_party/libjingle/source/talk/base/socketaddress.h"
  #include "third_party/libjingle/source/talk/base/sigslot.h"
  
  namespace base {
  class MessageLoop;
  }
  
  namespace cricket {
  class TransportChannel;
  }  // namespace cricket
  
  namespace jingle_glue {
  
  // TransportChannelSocketAdapter implements net::Socket interface on
  // top of libjingle's TransportChannel. It is used by
  // JingleChromotocolConnection to provide net::Socket interface for channels.
  class TransportChannelSocketAdapter : public net::Socket,
                                        public sigslot::has_slots<> {
   public:
    // TransportChannel object is always owned by the corresponding session.
    explicit TransportChannelSocketAdapter(cricket::TransportChannel* channel);
    virtual ~TransportChannelSocketAdapter();
  
    // Sets callback that should be called when the adapter is being
    // destroyed. The callback is not allowed to touch the adapter, but
    // can do anything else, e.g. destroy the TransportChannel.
    void SetOnDestroyedCallback(const base::Closure& callback);
  
    // Closes the stream. |error_code| specifies error code that will
    // be returned by Read() and Write() after the stream is closed.
    // Must be called before the session and the channel are destroyed.
    void Close(int error_code);
  
    // Socket implementation.
    virtual int Read(net::IOBuffer* buf, int buf_len,
                     const net::CompletionCallback& callback) OVERRIDE;
    virtual int Write(net::IOBuffer* buf, int buf_len,
                      const net::CompletionCallback& callback) OVERRIDE;
  
    virtual bool SetReceiveBufferSize(int32 size) OVERRIDE;
    virtual bool SetSendBufferSize(int32 size) OVERRIDE;
  
   private:
    void OnNewPacket(cricket::TransportChannel* channel,
                     const char* data,
                     size_t data_size,
                     const talk_base::PacketTime& packet_time,
                     int flags);
    void OnWritableState(cricket::TransportChannel* channel);
    void OnChannelDestroyed(cricket::TransportChannel* channel);
  
    base::MessageLoop* message_loop_;
  
    cricket::TransportChannel* channel_;
  
    base::Closure destruction_callback_;
  
    net::CompletionCallback read_callback_;
    scoped_refptr<net::IOBuffer> read_buffer_;
    int read_buffer_size_;
  
    net::CompletionCallback write_callback_;
    scoped_refptr<net::IOBuffer> write_buffer_;
    int write_buffer_size_;
  
    int closed_error_code_;
  
    DISALLOW_COPY_AND_ASSIGN(TransportChannelSocketAdapter);
  };
  
  }  // namespace jingle_glue
  
  #endif  // JINGLE_GLUE_CHANNEL_SOCKET_ADAPTER_H_
  