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/*
* The Unix Channel
*
* by Michel Beaudouin-Lafon
*
* Copyright 1990-1993
* Laboratoire de Recherche en Informatique (LRI)
*
* Reliable datagrams - to be updated
*
* $Id$
* $CurLog$
*/
#ifndef _DGRAM_H_
#define _DGRAM_H_
#include "global.h"
#include "Datagram.h"
#include "ccu/IdTable.h"
#include "ccu/List.h"
#include "ccu/Timer.h"
class UchDGRAM;
class UchMessage;
class UchDGRAM_TIMER : public CcuBaseTimer {
protected:
UchDGRAM& dgram;
void Handle (Millisecond);
public:
UchDGRAM_TIMER (UchDGRAM&);
~UchDGRAM_TIMER ();
};
class PENDING;
class UchDGRAM : public UchDatagram {
protected:
CcuIdTableOf <PENDING> pending; // pending messages
sword npending; // number of pending messages
short retry; // retry times
CcuListOf <PENDING> input; // input messages
sword ninput; // number of input messages
pUchAddress fromAddr; // address of last acknowledged message
lword outId; // id of message sent
UchDGRAM_TIMER timer; // timer to resend
Millisecond timeout; // timeout for timer
short locked;
bool resend;
bool sync;
void Init ();
int GetInput (int);
bool CheckInput ();
bool WaitInput ();
void SendAck (lword, UchAddress&);
void Expired ();
UchMsgBuffer* PrepareToSend (UchAddress&, int retries);
int SendBuffer (UchMsgBuffer&, UchAddress&);
void RemovePending (lword);
bool Wait (lword);
void Lock () { locked++; }
void Unlock () { if (--locked == 0 && resend) Resend (); }
public:
UchDGRAM ();
UchDGRAM (UchAddress*, UchAddress*);
~UchDGRAM ();
int Send (byte*, int, UchAddress&, bool = false, int retries = 0);
int Receive (byte*, int);
int Reply (byte*, int, bool = false, int retries = 0);
int Send (UchMsgBuffer&, UchAddress&, bool = false, bool = false, int retries = 0);
int Receive (UchMsgBuffer&);
int Reply (UchMsgBuffer&, bool = false, bool = false, int retries = 0);
bool Send (UchMessage&, UchAddress&, bool = false, int retries = 0);
bool Receive (UchMessage* msg);
bool Reply (UchMessage&, bool = false, int retries = 0);
virtual bool DiscardNotify (UchMsgBuffer&, UchAddress&);
int NumPending () { return npending; }
int NumInput () { return ninput; }
void SetRetry (short r) { retry = r; }
void SetRetryTime (Millisecond);
void SetSync (bool s) { sync = s; if (s) Drain (); }
void Resend ();
void Drain ();
virtual bool NewMessage (UchMsgBuffer&);
void HandleRead ();
bool HandleSelect ();
friend class UchDGRAM_TIMER;
};
#endif /* _DGRAM_H_ */
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