/** Start the gossiper with the generation # retrieved from the System table */
public void start(InetAddress localEndpoint, int generationNbr) {
localEndpoint_ = localEndpoint;
/* Get the seeds from the config and initialize them. */
Set<InetAddress> seedHosts = DatabaseDescriptor.getSeeds();
for (InetAddress seed : seedHosts) {
if (seed.equals(localEndpoint)) continue;
seeds_.add(seed);
}
/* initialize the heartbeat state for this localEndpoint */
EndpointState localState = endpointStateMap_.get(localEndpoint_);
if (localState == null) {
HeartBeatState hbState = new HeartBeatState(generationNbr);
localState = new EndpointState(hbState);
localState.isAlive(true);
localState.isAGossiper(true);
endpointStateMap_.put(localEndpoint_, localState);
}
// notify snitches that Gossiper is about to start
DatabaseDescriptor.getEndpointSnitch().gossiperStarting();
scheduledGossipTask =
StorageService.scheduledTasks.scheduleWithFixedDelay(
new GossipTask(),
Gossiper.intervalInMillis_,
Gossiper.intervalInMillis_,
TimeUnit.MILLISECONDS);
}
void isAlive(InetAddress addr, EndpointState epState, boolean value) {
epState.isAlive(value);
if (value) {
liveEndpoints_.add(addr);
unreachableEndpoints_.remove(addr);
for (IEndpointStateChangeSubscriber subscriber : subscribers_)
subscriber.onAlive(addr, epState);
} else {
liveEndpoints_.remove(addr);
unreachableEndpoints_.put(addr, System.currentTimeMillis());
for (IEndpointStateChangeSubscriber subscriber : subscribers_)
subscriber.onDead(addr, epState);
}
if (epState.isAGossiper()) return;
epState.isAGossiper(true);
}
/** This should *only* be used for testing purposes. */
public void initializeNodeUnsafe(InetAddress addr, int generationNbr) {
/* initialize the heartbeat state for this localEndpoint */
EndpointState localState = endpointStateMap_.get(addr);
if (localState == null) {
HeartBeatState hbState = new HeartBeatState(generationNbr);
localState = new EndpointState(hbState);
localState.isAlive(true);
localState.isAGossiper(true);
endpointStateMap_.put(addr, localState);
}
}
/** Add an endpoint we knew about previously, but whose state is unknown */
public void addSavedEndpoint(InetAddress ep) {
EndpointState epState = endpointStateMap_.get(ep);
if (epState == null) {
epState = new EndpointState(new HeartBeatState(0));
epState.isAlive(false);
epState.isAGossiper(true);
epState.setHasToken(true);
endpointStateMap_.put(ep, epState);
unreachableEndpoints_.put(ep, System.currentTimeMillis());
}
}