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      1 /*
      2  * libjingle
      3  * Copyright 2004--2005, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_BASE_ASYNCUDPSOCKET_H_
     29 #define TALK_BASE_ASYNCUDPSOCKET_H_
     30 
     31 #include "talk/base/asyncpacketsocket.h"
     32 #include "talk/base/scoped_ptr.h"
     33 #include "talk/base/socketfactory.h"
     34 
     35 namespace talk_base {
     36 
     37 // Provides the ability to receive packets asynchronously.  Sends are not
     38 // buffered since it is acceptable to drop packets under high load.
     39 class AsyncUDPSocket : public AsyncPacketSocket {
     40  public:
     41   // Creates a new socket for sending asynchronous UDP packets using an
     42   // asynchronous socket from the given factory.
     43   static AsyncUDPSocket* Create(SocketFactory* factory,
     44                                 const SocketAddress& address);
     45   explicit AsyncUDPSocket(AsyncSocket* socket);
     46   virtual ~AsyncUDPSocket();
     47 
     48   virtual SocketAddress GetLocalAddress(bool* allocated) const;
     49   virtual SocketAddress GetRemoteAddress() const;
     50   virtual int Send(const void *pv, size_t cb);
     51   virtual int SendTo(const void *pv, size_t cb, const SocketAddress& addr);
     52   virtual int Close();
     53 
     54   virtual Socket::ConnState GetState() const;
     55   virtual int GetOption(Socket::Option opt, int* value);
     56   virtual int SetOption(Socket::Option opt, int value);
     57   virtual int GetError() const;
     58   virtual void SetError(int error);
     59 
     60  private:
     61   // Called when the underlying socket is ready to be read from.
     62   void OnReadEvent(AsyncSocket* socket);
     63 
     64   scoped_ptr<AsyncSocket> socket_;
     65   char* buf_;
     66   size_t size_;
     67 };
     68 
     69 }  // namespace talk_base
     70 
     71 #endif  // TALK_BASE_ASYNCUDPSOCKET_H_
     72