#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 resip
{

class TransactionMessage;

class ConnectionBase
{
      friend std::ostream& operator<<(std::ostream& strm, const resip::ConnectionBase& c);
   public:
      ConnectionBase(const Tuple& who);
      ConnectionId getId() const;

      Transport* transport();

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

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

   protected:
      enum State
      {
         NewMessage = 0,
         ReadingHeaders,
         PartialBody,
         MAX
      };
	
      State getCurrentState() const { return mState; }
      void preparseNewBytes(int bytesRead, Fifo<TransactionMessage>& fifo);
      std::pair<char*, size_t> getWriteBuffer();
	 
      // 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?

      ConnectionBase();
      virtual ~ConnectionBase();
      // no value semantics
      ConnectionBase(const Connection&);
      ConnectionBase& operator=(const Connection&);
   protected:
      Tuple mWho;
   private:
      SipMessage* mMessage;
      char* mBuffer;
      size_t mBufferPos;
      size_t mBufferSize;

      static char connectionStates[MAX][32];
      UInt64 mLastUsed;
      State mState;
      MsgHeaderScanner mMsgHeaderScanner;
};

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

}

#endif
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