void
RandomLoadBalancerStrategy::afterReceiveInterest(const Face& inFace, const Interest& interest,
shared_ptr<fib::Entry> fibEntry,
shared_ptr<pit::Entry> pitEntry)
{
NFD_LOG_TRACE("afterReceiveInterest");
if (pitEntry->hasUnexpiredOutRecords()) {
// not a new Interest, don't forward
return;
}
const fib::NextHopList& nexthops = fibEntry->getNextHops();
// Ensure there is at least 1 Face is available for forwarding
if (!hasFaceForForwarding(nexthops, pitEntry)) {
this->rejectPendingInterest(pitEntry);
return;
}
fib::NextHopList::const_iterator selected;
do {
boost::random::uniform_int_distribution<> dist(0, nexthops.size() - 1);
const size_t randomIndex = dist(m_randomGenerator);
uint64_t currentIndex = 0;
for (selected = nexthops.begin(); selected != nexthops.end() && currentIndex != randomIndex;
++selected, ++currentIndex) {
}
} while (!canForwardToNextHop(pitEntry, *selected));
this->sendInterest(pitEntry, selected->getFace());
}
void
PickOneStrategy::afterReceiveInterest(const Face& inFace,
const Interest& interest,
shared_ptr<fib::Entry> fibEntry,
shared_ptr<fib::Entry> sitEntry,
shared_ptr<pit::Entry> pitEntry)
{
NFD_LOG_DEBUG("afterReceiveInterest interest=" << interest.getName());
int sdc = pitEntry->getFloodFlag();
uint32_t cost = 1;
bool sent = false;
if(fibEntry->hasNextHops())
{
cost = fibEntry->getNextHops()[0].getCost();
}
if(pitEntry->getDestinationFlag() && static_cast<bool>(sitEntry) /*&& sdc > 0*/)
{//Destination Flag is set so follow a randomly picked nexthop in SIT
const fib::NextHopList& nexthops = sitEntry->getNextHops();
// Ensure there is at least 1 Face is available for forwarding
if (hasFaceForForwarding(nexthops, pitEntry)) {
fib::NextHopList::const_iterator selected;
do {
boost::random::uniform_int_distribution<> dist(0, nexthops.size() - 1);
const size_t randomIndex = dist(m_randomGenerator);
uint64_t currentIndex = 0;
for (selected = nexthops.begin(); selected != nexthops.end() && currentIndex != randomIndex;
++selected, ++currentIndex) {
}
} while (!canForwardToNextHop(pitEntry, *selected));
sent = true;
this->sendInterest(pitEntry, selected->getFace());
}
}
else if(!pitEntry->getDestinationFlag() && static_cast<bool>(sitEntry) && sdc > 0 && cost > 0)
{ //pick a random nexthop from SIT if possible and send a search packet
const fib::NextHopList& nexthops = sitEntry->getNextHops();
// Ensure there is at least 1 Face is available for forwarding
if (hasFaceForForwarding(nexthops, pitEntry)) {
fib::NextHopList::const_iterator selected;
do {
boost::random::uniform_int_distribution<> dist(0, nexthops.size() - 1);
const size_t randomIndex = dist(m_randomGenerator);
uint64_t currentIndex = 0;
for (selected = nexthops.begin(); selected != nexthops.end() && currentIndex != randomIndex;
++selected, ++currentIndex) {
}
} while (!canForwardToNextHop(pitEntry, *selected));
sdc--;
pitEntry->setFloodFlag(sdc);
sent = true;
(*pitEntry).setDestinationFlag();
this->sendInterest(pitEntry, selected->getFace());
(*pitEntry).clearDestinationFlag();
}
}
if(!pitEntry->getDestinationFlag() && sdc > 0)
{
const fib::NextHopList& nexthops = fibEntry->getNextHops();
fib::NextHopList::const_iterator it = nexthops.end();
it = std::find_if(nexthops.begin(), nexthops.end(),
bind(&predicate_NextHop_eligible, pitEntry, _1, inFace.getId(),
false, time::steady_clock::TimePoint::min()));
if (it == nexthops.end()) {
NFD_LOG_DEBUG(interest << " from=" << inFace.getId() << " noNextHop");
NFD_LOG_INFO("Reject DF 0 (no eligible FIB next hop) interest=" << interest.getName());
}
else
{
shared_ptr<Face> outFace = it->getFace();
sdc--;
(*pitEntry).setFloodFlag(sdc);
NFD_LOG_INFO("Forwarding DF 0 using FIB interest=" << interest.getName());
sent = true;
this->sendInterest(pitEntry, outFace);
NFD_LOG_DEBUG(interest << " from=" << inFace.getId()
<< " newPitEntry-to=" << outFace->getId());
}
} //if sdc > 0
/*if (!sent) {
this->rejectPendingInterest(pitEntry);
}*/
}