sipretransmitmanager.h

来自「一个SIP协议栈」· C头文件 代码 · 共 80 行

#ifndef __SIPRETRANSMITMANAGER_H__
#define __SIPRETRANSMITMANAGER_H__


#include "SIPTimer.h"
#include "IPAddress.h"
#include "UDPSocket.h"
#include "SIPTimer.h"


namespace msip
{

    ///Retransmit Manager via UDP 
    class RetransmitManager
    {
    public:
        ///Current State
        enum Status
        {
            trIdle,
            trPending,
            trTransmitIndicated,
            trTimeoutReached
        };

    private:
        ///Timer1 0.5s, 1.0s, 2.0s, 4.0s
        Timer  tr_Timer1;

        ///Timer2 4.0s
        Timer  tr_Timer2;

        ///Current Interval in milliseconds
        double tr_Interval; 

        ///Current State
        Status tr_Status;

        ///Timer1 Value T1 (0.5s)
        long   tr_T1;

        ///Timer2 Value T2 (4.0s)
        long   tr_T2;

        ///Exponetial Value (2.0)
        double tr_Exp;


    public:
        ///Constructor
        RetransmitManager(long t1=500, long t2=4000, double exp_val=2.0);

        ///Set the timeout values and the exponent value
        void setTimeoutValues(long t1=500, long t2=4000, double exp_val=2.0);

        ///Start timers
        void   start();

        ///Cancel retransmittion
        void   cancel();

        ///Poll timers and return status.
        Status poll();

        ///Returns the time in milliseconds that left to the nearest retransmittion
        long   getTimeLeft() const;

        /**Get Current Status. Note, that the function will never return 
           the status trTransmitIndicated. Only the function "poll" will 
           return this status when retransmittion is necessary. */
        Status getStatus() { return tr_Status; }
    };

}


#endif