psinterface.cxx

SIP（Session Initiation Protocol）是由IETF定义

/* ====================================================================
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 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
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 *    and "Vovida Open Communication Application Library (VOCAL)" must
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 *    software without prior written permission. For written
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static const char* const PSInterface_cxx_Version =
    "$Id: PSInterface.cxx,v 1.11 2002/09/26 01:14:02 bko Exp $";
#include <stdlib.h>
#include <stdio.h>
#include <strstream.h>
#include <unistd.h>
#include <errno.h>

#include "PSInterface.hxx"
#include "VNetworkException.hxx"
#include "VIoException.hxx"
#include "cpLog.h"

const int PSInterface::NUM_TRIES = 10;
const int PSInterface::TIME_DELAY = 10;


PSInterface::PSInterface(const char* primhost, const int primport,
                         const char* althost, const int altport, 
			 const char* password) :
    _primary(primhost, primport, password), 
    _secondary(althost, altport, password)
{

    cpLog(LOG_DEBUG, "Primary Serve is %s:%d, Secondary: %s:%d",
          primhost, primport, althost, altport);

    // start by trying to talk to primary
    _interface = &_primary;
    _interface->setUse(true);

}


void
PSInterface::swapServers(string error)
{
    cpLog(LOG_ERR, "Failed to talk to pserver: %s", error.c_str());
    cpLog(LOG_ERR, "swapping pservers");

    // check which is being used, and swap 'em
    if (_primary.inUse())
    {

        _primary.setUse(false);
        _interface = &_secondary;
        _secondary.setUse(true);

    }
    else
    {

        _secondary.setUse(false);
        _interface = &_primary;
        _primary.setUse(true);

    }

}


// for most of these, I emulate a blocking socket by forever trying first
// one server, then the other

string
PSInterface::readItem(const string& group, const string &name)
throw (VException&)
{

    int numTries = 0;
    string dRet;

    while (1)
    {

        while (numTries < NUM_TRIES)
        {

            try
            {
                string dRet = _interface->readItem(group, name);
                return dRet;
            }
            catch (VNetworkException& e)
            {
                swapServers(e.getDescription());
            }

            numTries++;

        }

        cpLog(LOG_ERR, "Both Servers are dead. Sleeping.");
        sleep(TIME_DELAY);
        numTries = 0;

    }

    return dRet;

}


void
PSInterface::getList(const string& group, vector < Data > &retList)
throw (VNetworkException&)
{

    int numTries = 0;

    while (1)
    {

        while (numTries < NUM_TRIES)
        {

            try
            {
                _interface->getList(group, retList);
                return ;
            }
            catch (VNetworkException& e)
            {
                swapServers(e.getDescription());
            }

            numTries++;
        }

        cpLog(LOG_ERR, "Both Servers are dead. Sleeping.");
        sleep(TIME_DELAY);
        numTries = 0;

    }

    return ;

}


void
PSInterface::writeItem(const string& group, const string &name,
                       const string &contents)
throw (VNetworkException&)
{

    int numTries = 0;
    string dRet;


    while (1)
    {

        while (numTries < NUM_TRIES)
        {

            try
            {
                _interface->writeItem(group, name, contents);
                return ;
            }
            catch (VNetworkException& e)
            {
                swapServers(e.getDescription());
            }

            numTries++;

        }

        cpLog(LOG_ERR, "Both Servers are dead. Sleeping.");
        sleep(TIME_DELAY);
        numTries = 0;

    }

    return ;

}


void
PSInterface::deleteSubscriber(const string& subscriberName)
throw (VNetworkException&)
{

    int numTries = 0;

    while (1)
    {

        while (numTries < NUM_TRIES)
        {

            try
            {
                _interface->deleteSubscriber(subscriberName);
                return ;
            }
            catch (VNetworkException& e)
            {
                swapServers(e.getDescription());
            }

            numTries++;
        }

        cpLog(LOG_ERR, "Both Servers are dead. Sleeping.");
        sleep(TIME_DELAY);
        numTries = 0;

    }

    return ;

}


void
PSInterface::registerForItem(const string &group, const string &name,
                             const string &hostName)
throw (VNetworkException&)
{

    int numTries = 0;

    while (1)
    {

        while (numTries < NUM_TRIES)
        {

            try
            {
                _interface->registerForItem(group, name, hostName);
                return ;
            }
            catch (VNetworkException& e)
            {
                cpLog(LOG_DEBUG, "register item failed");
                swapServers(e.getDescription());
            }

            numTries++;

        }

        cpLog(LOG_ERR, "Both Servers are dead. Sleeping.");
        sleep(TIME_DELAY);
        numTries = 0;

    }

    return ;

}


void
PSInterface::registerForGroup(const string &group,
                              const string &hostName)
throw (VNetworkException&)
{

    int numTries = 0;

    while (1)
    {

        while (numTries < NUM_TRIES)
        {

            try
            {
                _interface->registerForGroup(group, hostName);
                return ;
            }
            catch (VNetworkException& e)
            {
                cpLog(LOG_DEBUG, "register group failed");
                swapServers(e.getDescription());
            }

            numTries++;

        }

        cpLog(LOG_ERR, "Both Servers are dead. Sleeping.");
        sleep(TIME_DELAY);
        numTries = 0;

    }

    return ;

}


void
PSInterface::unregisterForItem(const string &group, const string &name,
                               const string &hostName)
throw (VNetworkException&)
{
    int numTries = 0;

    while (1)
    {
        while (numTries < NUM_TRIES)
        {
            try
            {
                _interface->unregisterForItem(group, name, hostName);
                return ;
            }
            catch (VNetworkException& e)
            {
                cpLog(LOG_DEBUG, "unregister item failed");
                swapServers(e.getDescription());
            }
            numTries++;
        }

        cpLog(LOG_ERR, "Both Servers are dead. Sleeping.");
        sleep(TIME_DELAY);
        numTries = 0;
    }

    return ;
}


void
PSInterface::unregisterForGroup(const string &group,
                                const string &hostName)
throw (VNetworkException&)
{

    int numTries = 0;

    while (1)
    {
        while (numTries < NUM_TRIES)
        {
            try
            {
                _interface->unregisterForGroup(group, hostName);
                return ;
            }
            catch (VNetworkException& e)
            {
                cpLog(LOG_DEBUG, "unregister group failed");
                swapServers(e.getDescription());
            }
            numTries++;
        }

        cpLog(LOG_ERR, "Both Servers are dead. Sleeping.");
        sleep(TIME_DELAY);
        numTries = 0;
    }
    return ;
}


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