How to use

monitor

method

in

org.apache.druid.java.util.metrics.Monitor

 @Override
 public ScheduledExecutors.Signal call()
 {
  // Run one more time even if the monitor was removed, in case there's some extra data to flush
  if (monitor.monitor(emitter) && hasMonitor(monitor)) {
   return ScheduledExecutors.Signal.REPEAT;
  } else {
   removeMonitor(monitor);
   return ScheduledExecutors.Signal.STOP;
  }
 }
}

@Override
public boolean monitor(final ServiceEmitter emitter)
{
 return shouldReschedule(Lists.transform(monitors, monitor -> monitor.monitor(emitter)));
}

@Test
public void testDefaultFeed()
{
 StubServiceEmitter emitter = new StubServiceEmitter("dev/monitor-test", "localhost:0000");
 Monitor m = Monitors.createCompoundJvmMonitor(ImmutableMap.of());
 m.start();
 m.monitor(emitter);
 m.stop();
 checkEvents(emitter.getEvents(), "metrics");
}

@Test
public void testSetFeed()
{
 String feed = "testFeed";
 StubServiceEmitter emitter = new StubServiceEmitter("dev/monitor-test", "localhost:0000");
 Monitor m = Monitors.createCompoundJvmMonitor(ImmutableMap.of(), feed);
 m.start();
 m.monitor(emitter);
 m.stop();
 checkEvents(emitter.getEvents(), feed);
}

@Override
public boolean monitor(final ServiceEmitter emitter)
{
 return shouldReschedule(Lists.transform(monitors, monitor -> monitor.monitor(emitter)));
}

 @Override
 public ScheduledExecutors.Signal call()
 {
  // Run one more time even if the monitor was removed, in case there's some extra data to flush
  if (monitor.monitor(emitter) && hasMonitor(monitor)) {
   return ScheduledExecutors.Signal.REPEAT;
  } else {
   removeMonitor(monitor);
   return ScheduledExecutors.Signal.STOP;
  }
 }
}