talk/base/asyncudpsocket.h

/*
 * libjingle
 * Copyright 2004--2005, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products 
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
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 */

#ifndef TALK_BASE_ASYNCUDPSOCKET_H_
#define TALK_BASE_ASYNCUDPSOCKET_H_

#include "talk/base/asyncpacketsocket.h"
#include "talk/base/socketfactory.h"

namespace talk_base {

// Provides the ability to receive packets asynchronously.  Sends are not
// buffered since it is acceptable to drop packets under high load.
class AsyncUDPSocket : public AsyncPacketSocket {
 public:
  // Creates a new socket for sending asynchronous UDP packets using an
  // asynchronous socket from the given factory.
  static AsyncUDPSocket* Create(SocketFactory* factory) {
    AsyncSocket* sock = factory->CreateAsyncSocket(SOCK_DGRAM);
    return (sock) ? new AsyncUDPSocket(sock) : NULL;
  }
  explicit AsyncUDPSocket(AsyncSocket* socket);
  virtual ~AsyncUDPSocket();

 private:
  // Called when the underlying socket is ready to be read from.
  void OnReadEvent(AsyncSocket* socket);

  char* buf_;
  size_t size_;
};

// TODO: This is now deprecated. Remove it.
inline AsyncUDPSocket* CreateAsyncUDPSocket(SocketFactory* factory) {
  return AsyncUDPSocket::Create(factory);
}

}  // namespace talk_base

#endif  // TALK_BASE_ASYNCUDPSOCKET_H_