/** Starts the host monitor. Does nothing if the monitor is already running. */
void start() {
synchronized (this) {
if (timeout == null) {
timeout = Timer.getTimer().newTimeout(this, 0, TimeUnit.MILLISECONDS);
}
}
}
@Override
public void run(Timeout timeout) throws Exception {
for (IpAddress ip : monitoredAddresses) {
Set<Host> hosts = hostManager.getHostsByIp(ip);
if (hosts.isEmpty()) {
sendArpNdpRequest(ip);
} else {
for (Host host : hosts) {
HostProvider provider = hostProviders.get(host.providerId());
if (provider == null) {
hostProviders.remove(host.providerId(), null);
} else {
provider.triggerProbe(host);
}
}
}
}
this.timeout = Timer.getTimer().newTimeout(this, probeRate, TimeUnit.MILLISECONDS);
}