pjain1 commented on a change in pull request #10732: URL: https://github.com/apache/druid/pull/10732#discussion_r555315094
########## File path: core/src/main/java/org/apache/druid/java/util/metrics/ClockDriftSafeMonitorScheduler.java ########## @@ -0,0 +1,134 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +package org.apache.druid.java.util.metrics; + +import io.timeandspace.cronscheduler.CronScheduler; +import io.timeandspace.cronscheduler.CronTask; +import org.apache.druid.java.util.common.logger.Logger; +import org.apache.druid.java.util.emitter.service.ServiceEmitter; + +import java.util.List; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Future; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicReference; + +/** + * A {@link MonitorScheduler} implementation based on {@link CronScheduler}. + */ +public class ClockDriftSafeMonitorScheduler extends MonitorScheduler +{ + private static final Logger LOG = new Logger(ClockDriftSafeMonitorScheduler.class); + + private final CronScheduler monitorScheduler; + private final ExecutorService monitorRunner; + + public ClockDriftSafeMonitorScheduler( + MonitorSchedulerConfig config, + ServiceEmitter emitter, + List<Monitor> monitors, + CronScheduler monitorScheduler, + ExecutorService monitorRunner + ) + { + super(config, emitter, monitors); + this.monitorScheduler = monitorScheduler; + this.monitorRunner = monitorRunner; + } + + @Override + void startMonitor(final Monitor monitor) + { + monitor.start(); + long rate = getConfig().getEmitterPeriod().getMillis(); + final AtomicReference<Future<?>> scheduleFutureReference = new AtomicReference<>(); + Future<?> scheduledFuture = monitorScheduler.scheduleAtFixedRate( + rate, + rate, + TimeUnit.MILLISECONDS, + new CronTask() + { + private Future<?> scheduleFuture = null; + private Future<Boolean> monitorFuture = null; + + @Override + public void run(long scheduledRunTimeMillis) + { + waitForScheduleFutureToBeSet(); Review comment: ok ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@druid.apache.org For additional commands, e-mail: commits-h...@druid.apache.org
