sipretransmitmanager.cxx

来自「一个SIP协议栈」· CXX 代码 · 共 90 行

#include "SIPRetransmitManager.h"


namespace msip
{

    //----------------------------------------------------------------------------------
    RetransmitManager::RetransmitManager(long t1, long t2, double exp_val)
    : tr_T1(t1),
      tr_T2(t2),
      tr_Exp(exp_val),
      tr_Interval(t1), 
      tr_Status(trIdle)
    {
    }

    //----------------------------------------------------------------------------------
    void 
    RetransmitManager::setTimeoutValues(long t1, long t2, double exp_val)
    {
        tr_T1 = t1;
        tr_T2 = t2;
        tr_Exp = exp_val;
    }

    //----------------------------------------------------------------------------------
    void 
    RetransmitManager::start()
    {
        tr_Interval = tr_T1;
        tr_Timer1.setInterval(long(tr_Interval));
        tr_Timer2.setInterval(tr_T2);
        tr_Status = trPending;
    }

    //----------------------------------------------------------------------------------
    void 
    RetransmitManager::cancel()
    {
        tr_Status = trIdle;
    }


    //----------------------------------------------------------------------------------
    RetransmitManager::Status 
    RetransmitManager::poll()
    {
        Status st = tr_Status;

        if(tr_Status == trPending)
        {
            Timer tm;
            tm.setCurrent();

            if(tr_Timer2.outOfInterval(tm))
            {
                st = tr_Status = trTimeoutReached;
            }
            else
            {
                if(tr_Timer1.outOfInterval(tm))
                {
                    tr_Interval = int(tr_Interval * tr_Exp);
                    tr_Timer1.setInterval(long(tr_Interval));
                    st = trTransmitIndicated;
                }
            }
        }
        return st;
    }


    //----------------------------------------------------------------------------------
    long 
    RetransmitManager::getTimeLeft() const
    {
        long interval = 0x7FFFFFFFl; //MAX_LONG
        if(tr_Status == trPending)
        {
            interval = tr_Timer1.getInterval();
            if(interval < 0) interval = 0;
        }
        return interval;
    }


}