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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   // Binds |socket| and creates AsyncUDPSocket for it. Takes ownership
     42   // of |socket|. Returns NULL if bind() fails (|socket| is destroyed
     43   // in that case).
     44   static AsyncUDPSocket* Create(AsyncSocket* socket,
     45                                 const SocketAddress& bind_address);
     46   // Creates a new socket for sending asynchronous UDP packets using an
     47   // asynchronous socket from the given factory.
     48   static AsyncUDPSocket* Create(SocketFactory* factory,
     49                                 const SocketAddress& bind_address);
     50   explicit AsyncUDPSocket(AsyncSocket* socket);
     51   virtual ~AsyncUDPSocket();
     52 
     53   virtual SocketAddress GetLocalAddress() const;
     54   virtual SocketAddress GetRemoteAddress() const;
     55   virtual int Send(const void *pv, size_t cb, DiffServCodePoint dscp);
     56   virtual int SendTo(const void *pv, size_t cb, const SocketAddress& addr,
     57                      DiffServCodePoint dscp);
     58   virtual int Close();
     59 
     60   virtual State GetState() const;
     61   virtual int GetOption(Socket::Option opt, int* value);
     62   virtual int SetOption(Socket::Option opt, int value);
     63   virtual int GetError() const;
     64   virtual void SetError(int error);
     65 
     66  private:
     67   // Called when the underlying socket is ready to be read from.
     68   void OnReadEvent(AsyncSocket* socket);
     69   // Called when the underlying socket is ready to send.
     70   void OnWriteEvent(AsyncSocket* socket);
     71 
     72   scoped_ptr<AsyncSocket> socket_;
     73   char* buf_;
     74   size_t size_;
     75 };
     76 
     77 }  // namespace talk_base
     78 
     79 #endif  // TALK_BASE_ASYNCUDPSOCKET_H_
     80