rfid_tag_phy.cpp

#include "rfid_tag_phy.hpp"
#include "node.hpp"

RfidTagPhy::RfidTagPhy(
   NodePtr node, WirelessChannelManagerPtr wirelessChannelManager)
   : PhysicalLayer(node), m_sendingChannelIsValid(false), 
   m_allListenersChannelIsValid(false)
{
   m_wirelessChannelManagerPtr = wirelessChannelManager;
}

RfidTagPhy::~RfidTagPhy()
{
   // Detatch from any channels to which it is still attached.
   if(m_sendingChannelIsValid) {
      m_wirelessChannelManagerPtr->detachAsSender(thisPhysicalLayer(), 
         m_sendingChannel);
   }

   if(m_allListenersChannelIsValid) {
      m_wirelessChannelManagerPtr->detachAsListener(thisPhysicalLayer(),
         m_allListenersChannel);
   }
}

void RfidTagPhy::simulationEndHandler()
{

}

void RfidTagPhy::resetSendingChannel()
{
   assert(m_wirelessChannelManagerPtr.get() != 0);

   if(m_sendingChannelIsValid) {
      m_wirelessChannelManagerPtr->detachAsSender(thisPhysicalLayer(), 
         m_sendingChannel);
   }

}

bool RfidTagPhy::setSendingChannel(t_uint channelId)
{
   assert(m_wirelessChannelManagerPtr.get() != 0);

   // First, we need to see if we can detach from our current
   // channel if it's valid.
   resetSendingChannel();

   bool wasSuccessful = true;
   wasSuccessful &= m_wirelessChannelManagerPtr->attachAsSender(
      thisPhysicalLayer(), channelId);

   m_sendingChannelIsValid = wasSuccessful;
   m_sendingChannel = channelId;

   return wasSuccessful;
}

bool RfidTagPhy::setAllListenersChannel(t_uint channelId)
{
   assert(m_wirelessChannelManagerPtr.get() != 0);

   resetAllListenersChannel();

   bool wasSuccessful = true;
   wasSuccessful &= m_wirelessChannelManagerPtr->attachAsListener(
      thisPhysicalLayer(), channelId);

   m_allListenersChannelIsValid = wasSuccessful;
   m_allListenersChannel = channelId;

   return wasSuccessful;

}

void RfidTagPhy::resetAllListenersChannel()
{

   assert(m_wirelessChannelManagerPtr.get() != 0);
   if(m_allListenersChannelIsValid) {
      m_wirelessChannelManagerPtr->detachAsListener(thisPhysicalLayer(),
         m_allListenersChannel);
   }

   m_allListenersChannelIsValid = false;
}

void RfidTagPhy::recvdErrorFreeSignal(WirelessCommSignalPtr signal,
   double recvdSignalStrength)
{
   // The tag should lock onto the channel on which the
   // packet was received.
   setSendingChannel(signal->getChannelId());
   setCurrentTxPower(recvdSignalStrength);
}

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