protected void publishSupport() {
DHTTransport transport = dht.getTransport();
if (TESTING || !transport.isReachable()) {
DHTTransportContact local_contact = transport.getLocalContact();
// see if the rendezvous has failed and therefore we are required to find a new one
boolean force =
rendezvous_target != null
&& failed_rendezvous.containsKey(rendezvous_target.getAddress());
if (rendezvous_local_contact != null && !force) {
if (local_contact.getAddress().equals(rendezvous_local_contact.getAddress())) {
// already running for the current local contact
return;
}
}
DHTTransportContact explicit =
(DHTTransportContact) explicit_rendezvous_map.get(local_contact.getAddress());
if (explicit != null) {
try {
pub_mon.enter();
rendezvous_local_contact = local_contact;
rendezvous_target = explicit;
runRendezvous();
} finally {
pub_mon.exit();
}
} else {
final DHTTransportContact[] new_rendezvous_target = {null};
DHTTransportContact[] reachables = dht.getTransport().getReachableContacts();
int reachables_tried = 0;
int reachables_skipped = 0;
final Semaphore sem = plugin_interface.getUtilities().getSemaphore();
for (int i = 0; i < reachables.length; i++) {
DHTTransportContact contact = reachables[i];
try {
pub_mon.enter();
// see if we've found a good one yet
if (new_rendezvous_target[0] != null) {
break;
}
// skip any known bad ones
if (failed_rendezvous.containsKey(contact.getAddress())) {
reachables_skipped++;
sem.release();
continue;
}
} finally {
pub_mon.exit();
}
if (i > 0) {
try {
Thread.sleep(1000);
} catch (Throwable e) {
}
}
reachables_tried++;
contact.sendPing(
new DHTTransportReplyHandlerAdapter() {
public void pingReply(DHTTransportContact ok_contact) {
trace("Punch:" + ok_contact.getString() + " OK");
try {
pub_mon.enter();
if (new_rendezvous_target[0] == null) {
new_rendezvous_target[0] = ok_contact;
}
} finally {
pub_mon.exit();
sem.release();
}
}
public void failed(DHTTransportContact failed_contact, Throwable e) {
try {
trace("Punch:" + failed_contact.getString() + " Failed");
} finally {
sem.release();
}
}
});
}
for (int i = 0; i < reachables.length; i++) {
sem.reserve();
try {
pub_mon.enter();
if (new_rendezvous_target[0] != null) {
rendezvous_target = new_rendezvous_target[0];
rendezvous_local_contact = local_contact;
log(
"Rendezvous found: "
+ rendezvous_local_contact.getString()
+ " -> "
+ rendezvous_target.getString());
runRendezvous();
break;
}
} finally {
pub_mon.exit();
}
}
if (new_rendezvous_target[0] == null) {
log(
"No rendezvous found: candidates="
+ reachables.length
+ ",tried="
+ reachables_tried
+ ",skipped="
+ reachables_skipped);
try {
pub_mon.enter();
rendezvous_local_contact = null;
rendezvous_target = null;
} finally {
pub_mon.exit();
}
}
}
} else {
try {
pub_mon.enter();
rendezvous_local_contact = null;
rendezvous_target = null;
} finally {
pub_mon.exit();
}
}
}
public void start() {
if (started) {
return;
}
started = true;
DHTTransport transport = dht.getTransport();
transport.addListener(
new DHTTransportListener() {
public void localContactChanged(DHTTransportContact local_contact) {
publish(false);
}
public void currentAddress(String address) {}
public void reachabilityChanged(boolean reacheable) {
publish(false);
}
});
transport.registerTransferHandler(
transfer_handler_key,
new DHTTransportTransferHandler() {
public String getName() {
return ("NAT Traversal");
}
public byte[] handleRead(DHTTransportContact originator, byte[] key) {
return (null);
}
public byte[] handleWrite(DHTTransportContact originator, byte[] key, byte[] value) {
return (receiveRequest((DHTTransportUDPContact) originator, value));
}
});
timer.addPeriodicEvent(
REPUBLISH_TIME_MIN,
new UTTimerEventPerformer() {
public void perform(UTTimerEvent event) {
publish(false);
}
});
timer.addPeriodicEvent(
RENDEZVOUS_SERVER_TIMEOUT / 2,
new UTTimerEventPerformer() {
public void perform(UTTimerEvent event) {
long now = plugin_interface.getUtilities().getCurrentSystemTime();
try {
server_mon.enter();
Iterator it = rendezvous_bindings.values().iterator();
while (it.hasNext()) {
Object[] entry = (Object[]) it.next();
long time = ((Long) entry[1]).longValue();
boolean removed = false;
if (time > now) {
// clock change, easiest approach is to remove it
it.remove();
removed = true;
} else if (now - time > RENDEZVOUS_SERVER_TIMEOUT) {
// timeout
it.remove();
removed = true;
}
if (removed) {
log(
"Rendezvous "
+ ((DHTTransportContact) entry[0]).getString()
+ " removed due to inactivity");
}
}
} finally {
server_mon.exit();
}
}
});
publish(false);
}
