forked from matthewjmiller1/RFIDSIM
/
communication_layer.cpp
220 lines (190 loc) · 5.03 KB
/
communication_layer.cpp
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#include "communication_layer.hpp"
#include "node.hpp"
#include "log_stream_manager.hpp"
#include "packet.hpp"
const t_uint CommunicationLayer::m_DEFAULT_MAX_QUEUE_LENGTH = 50;
CommunicationLayer::CommunicationLayer(NodePtr node)
: m_lowerLayerRecvEventPending(false),
m_node(node), m_lowerLayerDelay(0.0), m_upperLayerDelay(0.0),
m_defaultLowerLayerIdx(0), m_defaultUpperLayerIdx(0),
m_maxQueueLength(m_DEFAULT_MAX_QUEUE_LENGTH), m_queueIsBlocked(false)
{
}
CommunicationLayer::~CommunicationLayer()
{
}
void CommunicationLayer::blockUpperQueues()
{
for(t_uint i = 0; i < m_upperLayers.size(); ++i) {
m_upperLayers[i]->blockQueue();
}
}
void CommunicationLayer::unblockUpperQueues()
{
t_uint i = 0;
while(!queueIsFull() && i < m_upperLayers.size()) {
m_upperLayers[i]->unblockQueue();
++i;
}
}
void CommunicationLayer::sendFromQueue()
{
while(!m_lowerLayerRecvEventPending && !m_queueIsBlocked &&
!m_packetQueue.empty()) {
pair<PacketPtr,t_uint> queueElement = m_packetQueue.front();
m_packetQueue.pop_front();
sendToLayer(CommunicationLayer::Directions_Lower,
queueElement.first, queueElement.second);
}
if(!queueIsFull())
unblockUpperQueues();
}
bool CommunicationLayer::sendToQueue(PacketPtr packet)
{
return sendToQueue(packet,
getDefaultLayer(CommunicationLayer::Directions_Lower));
}
bool CommunicationLayer::sendToQueue(PacketPtr packet,
t_uint lowerLayerIdx)
{
bool wasSuccessful = false;
pair<PacketPtr,t_uint> queueElement =
make_pair(packet, lowerLayerIdx);
if(!queueIsFull()) {
wasSuccessful = true;
m_packetQueue.push_back(queueElement);
sendFromQueue();
} else {
// The packet is dropped.
}
if(queueIsFull())
blockUpperQueues();
return wasSuccessful;
}
bool CommunicationLayer::sendToLayer(
Directions direction, PacketPtr packet)
{
return sendToLayer(direction, packet, getDefaultLayer(direction));
}
bool CommunicationLayer::sendToAllLayers(
Directions direction, PacketPtr packet)
{
t_uint layersTotal = numberOfLayers(direction);
bool wasSentToAllLayers = true;
for(t_uint i = 0; i < layersTotal; i++) {
wasSentToAllLayers &= sendToLayer(direction, packet, i);
}
return wasSentToAllLayers;
}
bool CommunicationLayer::sendToLayer(
Directions direction, PacketPtr packet, t_uint recvingLayerIdx)
{
assert(packet != 0);
assert(recvingLayerIdx < numberOfLayers(direction));
CommunicationLayerPtr recvingLayer;
switch(direction) {
case Directions_Lower:
recvingLayer = m_lowerLayers[recvingLayerIdx];
break;
case Directions_Upper:
removeLayerData(packet);
recvingLayer = m_upperLayers[recvingLayerIdx];
break;
default:
assert(false);
}
assert(recvingLayer.get() != 0);
LogStreamManager::instance()->logPktSendItem(getNodeId(),
getLayerType(), *packet);
EventPtr recvEvent = LayerRecvEvent::create(direction,
packet, recvingLayer, shared_from_this());
if(direction == Directions_Lower)
setLowerLayerRecvEventPending(true);
assert(m_node != 0);
bool wasScheduled = m_node->scheduleEvent(recvEvent,
getLayerDelay(direction));
return wasScheduled;
}
bool CommunicationLayer::recvFromLayer(Directions direction,
PacketPtr packet, CommunicationLayerPtr sendingLayer)
{
bool layerFound = false;
t_uint sendingLayerIdx;
vector<CommunicationLayerPtr>* layerVector = 0;
switch(direction) {
case Directions_Lower:
layerVector = &m_lowerLayers;
break;
case Directions_Upper:
layerVector = &m_upperLayers;
break;
default:
assert(false);
}
assert(layerVector != 0);
t_uint layersTotal = numberOfLayers(direction);
for(t_uint i = 0; i < layersTotal; i++) {
if((*layerVector)[i] == sendingLayer) {
layerFound = true;
sendingLayerIdx = i;
break;
}
}
bool wasRecvd = false;
if(layerFound) {
LogStreamManager::instance()->logPktRecvItem(getNodeId(),
getLayerType(), *packet);
wasRecvd = recvFromLayer(direction, packet, sendingLayerIdx);
}
return wasRecvd;
}
bool CommunicationLayer::recvFromLayer(
Directions direction, PacketPtr packet, t_uint recvLayerIdx)
{
// By default, we just pass this along to the default
// next layer or do nothing if none exist
Directions directionToSend =
Directions_Lower;
switch(direction) {
case Directions_Lower:
directionToSend = Directions_Upper;
break;
case Directions_Upper:
directionToSend = Directions_Lower;
break;
default:
assert(false);
}
if(numberOfLayers(directionToSend) > 0) {
sendToLayer(directionToSend, packet);
}
return true;
}
NodeId CommunicationLayer::getNodeId() const
{
NodePtr owner = getNode();
assert(owner.get() != 0);
return owner->getNodeId();
}
void CommunicationLayer::removeLayerData(PacketPtr packet) const
{
switch(getLayerType()) {
case Types_Application:
packet->removeData(Packet::DataTypes_Application);
break;
case Types_Transport:
packet->removeData(Packet::DataTypes_Transport);
break;
case Types_Network:
packet->removeData(Packet::DataTypes_Network);
break;
case Types_Link:
packet->removeData(Packet::DataTypes_Link);
break;
case Types_Physical:
packet->removeData(Packet::DataTypes_Physical);
break;
default:
assert(false);
}
}