connectionbase.hxx

这是国外的resip协议栈

#ifndef RESIP_ConnectionBase_hxx
#define RESIP_ConnectionBase_hxx

/**
   Abstracts some of the connection functionality. Managed connections (@see
   ConnectionManager) derive from Connection. Non-managed connections may be
   derived from ConnectionBase.

   @todo check id connectionId makes sense here
*/

#include <list>

#include "rutil/Timer.hxx"
#include "rutil/Fifo.hxx"
#include "resip/stack/Transport.hxx"
#include "resip/stack/MsgHeaderScanner.hxx"
#include "resip/stack/SendData.hxx"

namespace osc
{
   class Stack;
   class TcpStream;
}

namespace resip
{

class TransactionMessage;
class Compression;

class ConnectionBase
{
      friend std::ostream& operator<<(std::ostream& strm, const resip::ConnectionBase& c);
   public:
      ConnectionBase(Transport* transport,
                     const Tuple& who,
                     Compression &compression = Compression::Disabled);
      FlowKey getFlowKey() const;
      
      /// @todo should be reference
      virtual Transport* transport() const;

      Tuple& who() { return mWho; }
      const UInt64& whenLastUsed() { return mLastUsed; }

      enum { ChunkSize = 2048 }; // !jf! what is the optimal size here?

   protected:
      enum ConnState
      {
         NewMessage = 0,
         ReadingHeaders,
         PartialBody,
         SigComp, // This indicates that incoming bytes are compressed.
         MAX
      };

      typedef enum
      {
         Unknown,
         Uncompressed,
         Compressed
      } TransmissionFormat;

      ConnState getCurrentState() const { return mConnState; }
      void preparseNewBytes(int bytesRead, Fifo<TransactionMessage>& fifo);
      void decompressNewBytes(int bytesRead, Fifo<TransactionMessage>& fifo);
      std::pair<char*, size_t> getWriteBuffer();
      char* getWriteBufferForExtraBytes(int extraBytes);
      
      // for avoiding copies in external transports--not used in core resip
      void setBuffer(char* bytes, int count);

      Data::size_type mSendPos;
      std::list<SendData*> mOutstandingSends; // !jacob! intrusive queue?

      virtual ~ConnectionBase();
      // no value semantics
   private:
      ConnectionBase();
      ConnectionBase(const Connection&);
      ConnectionBase& operator=(const Connection&);
   protected:
      virtual void onDoubleCRLF(){}
      Transport* mTransport;
      Tuple mWho;
      TransportFailure::FailureReason mFailureReason;      
      Compression &mCompression;
      osc::Stack *mSigcompStack;
      osc::TcpStream *mSigcompFramer;
      TransmissionFormat mSendingTransmissionFormat;
      TransmissionFormat mReceivingTransmissionFormat;

   private:
      SipMessage* mMessage;
      char* mBuffer;
      size_t mBufferPos;
      size_t mBufferSize;

      static char connectionStates[MAX][32];
      UInt64 mLastUsed;
      ConnState mConnState;
      MsgHeaderScanner mMsgHeaderScanner;
};

std::ostream& 
operator<<(std::ostream& strm, const resip::ConnectionBase& c);

}

#endif
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