/**
* Gathers Jingle Nodes candidates for all host <tt>Candidate</tt>s that are already present in
* the specified <tt>component</tt>. This method relies on the specified <tt>component</tt> to
* already contain all its host candidates so that it would resolve them.
*
* @param component the {@link Component} that we'd like to gather candidate Jingle Nodes
* <tt>Candidate</tt>s for
* @return the <tt>LocalCandidate</tt>s gathered by this <tt>CandidateHarvester</tt>
*/
@Override
public synchronized Collection<LocalCandidate> harvest(Component component) {
logger.info("harvest Jingle Nodes");
Collection<LocalCandidate> candidates = new HashSet<LocalCandidate>();
String ip = null;
int port = -1;
/* if we have already a candidate (RTCP) allocated, get it */
if (localAddressSecond != null && relayedAddressSecond != null) {
LocalCandidate candidate =
createJingleNodesCandidate(relayedAddressSecond, component, localAddressSecond);
// try to add the candidate to the component and then only add it to
// the harvest not redundant (not sure how it could be red. but ...)
if (component.addLocalCandidate(candidate)) {
candidates.add(candidate);
}
localAddressSecond = null;
relayedAddressSecond = null;
return candidates;
}
XMPPConnection conn = serviceNode.getConnection();
JingleChannelIQ ciq = null;
if (serviceNode != null) {
final TrackerEntry preferred = serviceNode.getPreferedRelay();
if (preferred != null) {
ciq = SmackServiceNode.getChannel(conn, preferred.getJid());
}
}
if (ciq != null) {
ip = ciq.getHost();
port = ciq.getRemoteport();
if (logger.isInfoEnabled()) {
logger.info(
"JN relay: " + ip + " remote port:" + port + " local port: " + ciq.getLocalport());
}
if (ip == null || ciq.getRemoteport() == 0) {
logger.warn("JN relay ignored because ip was null or port 0");
return candidates;
}
// Drop the scope or interface name if the relay sends it
// along in its IPv6 address. The scope/ifname is only valid on the
// host that owns the IP and we don't need it here.
int scopeIndex = ip.indexOf('%');
if (scopeIndex > 0) {
logger.warn("Dropping scope from assumed IPv6 address " + ip);
ip = ip.substring(0, scopeIndex);
}
/* RTP */
TransportAddress relayedAddress = new TransportAddress(ip, port, Transport.UDP);
TransportAddress localAddress = new TransportAddress(ip, ciq.getLocalport(), Transport.UDP);
LocalCandidate local = createJingleNodesCandidate(relayedAddress, component, localAddress);
/* RTCP */
relayedAddressSecond = new TransportAddress(ip, port + 1, Transport.UDP);
localAddressSecond = new TransportAddress(ip, ciq.getLocalport() + 1, Transport.UDP);
// try to add the candidate to the component and then only add it to
// the harvest not redundant (not sure how it could be red. but ...)
if (component.addLocalCandidate(local)) {
candidates.add(local);
}
}
return candidates;
}
