link_layer.cpp

#include "link_layer.hpp"
#include "mac_protocol.hpp"
#include "physical_layer.hpp"

const t_uint LinkLayer::m_LINK_LAYER_QUEUE_LENGTH = 1;

LinkLayer::LinkLayer(NodePtr node, MacProtocolPtr macProtocol)
   : CommunicationLayer(node), m_macProtocol(macProtocol)
{
   setMaxQueueLength(m_LINK_LAYER_QUEUE_LENGTH);
}

void LinkLayer::simulationEndHandler()
{

}

bool LinkLayer::channelIsBusy()
{
   CommunicationLayer::Directions direction = 
      CommunicationLayer::Directions_Lower;
   PhysicalLayerPtr physicalLayer = 
      boost::dynamic_pointer_cast<PhysicalLayer>
      (getLayer(direction, getDefaultLayer(direction)));
   assert(physicalLayer.get() != 0);
   return physicalLayer->channelCarrierSensedBusy();
}

bool LinkLayer::recvFromMacProtocol(
   CommunicationLayer::Directions direction, PacketPtr packet)
{
   // Use the default function with packet passed back from
   // the MAC.
   return CommunicationLayer::sendToLayer(direction, packet);
}

bool LinkLayer::recvFromLayer(
   CommunicationLayer::Directions direction, PacketPtr packet,
   t_uint sendingLayerIdx)
{
   assert(m_macProtocol.get() != 0);
   return m_macProtocol->recvFromLinkLayer(
      direction, packet, sendingLayerIdx);
}

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