link_layer.cpp

来自「RFID reader 语 tag 模拟器」· C++ 代码 · 共 50 行

 #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);
 }