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A bit of code comment cleanup.

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This commit is contained in:
Adam Ierymenko 2013-08-21 10:19:34 -04:00
parent edad580c32
commit 1d9977b8b9
1 changed files with 15 additions and 26 deletions
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41
node/Multicaster.hpp
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@ -208,6 +208,7 @@ public:
/**
* Choose peers to send a propagating multicast to
*
* @param prng Random source
* @param topology Topology object or mock thereof
* @param nwid Network ID
* @param mg Multicast group
@ -236,49 +237,37 @@ public:
{
typename std::set< P,_PeerPropagationPrioritySortOrder<P> > toConsider;
// Pick up to ZT_MULTICAST_PICK_MAX_SAMPLE_SIZE peers that have
// subscribed to this channel and that are not in bloom filter.
// Pick randomly from subscribers, but place into a set that is
// sorted in descending order of time of most recent unicast
// frame transfer. (Implicit social ordering.) Also ignore original
// submitter and upstream, since we know these have seen this
// message.
/* Pick up to ZT_MULTICAST_PICK_MAX_SAMPLE_SIZE peers that meet
* our minimal criteria for this multicast group and place them
* into a set that is sorted in descending order of time of most
* recent unicast frame transfer (implicit social ordering). */
{
Mutex::Lock _l(_multicastMemberships_m);
std::map< MulticastChannel,std::vector<MulticastMembership> >::iterator mm(_multicastMemberships.find(MulticastChannel(nwid,mg)));
if ((mm != _multicastMemberships.end())&&(!mm->second.empty())) {
for(unsigned int stries=0;stries<ZT_MULTICAST_PICK_MAX_SAMPLE_SIZE;++stries) {
MulticastMembership &m = mm->second[prng.next32() % mm->second.size()];
if (((now - m.second) < ZT_MULTICAST_LIKE_EXPIRE)&&(!bf.contains(m.first.sum()))&&(m.first != originalSubmitter)&&(m.first != upstream)) {
if (
((now - m.second) < ZT_MULTICAST_LIKE_EXPIRE)&& /* LIKE is not expired */
(!bf.contains(m.first.sum()))&& /* Not in propagation bloom */
(m.first != originalSubmitter)&& /* Not the original submitter */
(m.first != upstream) ) { /* Not where the frame came from */
P peer(topology.getPeer(m.first));
if (peer)
toConsider.insert(peer);
toConsider.insert(peer); /* Consider propagating to this peer */
}
}
}
}
// The first peers in toConsider will be the 'best'
/* The first peers in toConsider will be the "best" */
unsigned int chosen = 0;
for(typename std::set< P,_PeerPropagationPrioritySortOrder<P> >::iterator i(toConsider.begin());((i!=toConsider.end())&&(chosen < max));++i)
bf.set((peers[chosen++] = *i)->address().sum());
// Add a supernode if there are fewer than the desired
// number of recipients. Note that we do not use the bloom
// filter to track visits to supernodes, intentionally
// allowing multicasts to ping pong between supernodes.
// Supernodes propagate even messages they've already seen,
// while regular nodes do not. Thus this ping-ponging will
// cause the supernodes to pick new starting points for
// peer to peer graph traversal multiple times. It's a
// simple, stateless way to increase supernode-driven
// propagation of a multicast in the event that peer to
// peer connectivity for its group is sparse.
if (chosen < max) {
Address avoid[2];
avoid[0] = originalSubmitter;
avoid[1] = upstream;
P peer = topology.getBestSupernode(avoid,2,true);
/* Tack on a supernode if we have no next hops */
if (!chosen) {
P peer = topology.getBestSupernode();
if (peer)
peers[chosen++] = peer;
}