/**
* Pings initial members. Removes self before returning vector of initial members. Uses IP
* multicast or gossiping, depending on parameters.
*/
void findInitialMembers() {
PingRsp ping_rsp;
synchronized (initial_mbrs) {
findInitialMbrsAttempts++; // GemStoneAddition
initial_mbrs.removeAllElements();
initial_mbrs_received = false;
gms.passDown(new Event(Event.FIND_INITIAL_MBRS));
// the initial_mbrs_received flag is needed when passDown() is executed on the same thread, so
// when
// it returns, a response might actually have been received (even though the initial_mbrs
// might still be empty)
while /*GemStoneAddition*/ (initial_mbrs_received == false) {
try {
initial_mbrs
.wait(); // gms.join_timeout+1000); // GemStoneAddition bug #34274 - don't wait
// forever
} catch (InterruptedException e) { // GemStoneAddition
Thread.currentThread().interrupt();
initial_mbrs_received = true; // suppress any late updates
// process whatever he have now. Note that since we are
// stilled synchronized on initial_mbrs, asynchronous updates
// won't come in before we return a result.
}
}
for (int i = 0; i < initial_mbrs.size(); i++) {
ping_rsp = (PingRsp) initial_mbrs.elementAt(i);
if (ping_rsp.own_addr != null
&& gms.local_addr != null
&& ping_rsp.own_addr.equals(gms.local_addr)) {
initial_mbrs.removeElementAt(i);
break;
}
}
if (findInitialMbrsAttempts > 2) {
// GemStoneAddition: bug #50785 - if we have made some rounds using
// best-guess coordinator candidates from other processes that have
// yet to join the group then we stop trusting this gossip
// because it can just ping-pong around between members that are
// still trying to join. See PingWaiter.getPossibleCoordinator().
List<PingRsp> removals = new ArrayList<PingRsp>(initial_mbrs.size());
for (int i = 0; i < initial_mbrs.size(); i++) {
ping_rsp = (PingRsp) initial_mbrs.elementAt(i);
if (ping_rsp.own_addr != null
&& !ping_rsp.isServer()
&& !ping_rsp.getCoordAddress().equals(ping_rsp.own_addr)) {
removals.add(ping_rsp);
}
}
initial_mbrs.removeAll(removals);
}
}
}
