content: /**
   * 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 io.jafka.utils;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  import java.util.concurrent.ScheduledFuture;
  import java.util.concurrent.ScheduledThreadPoolExecutor;
  import java.util.concurrent.ThreadFactory;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicLong;
  
  /**
   * A scheduler for running jobs in the background
   *
   * @author adyliu (imxylz@gmail.com)
   * @since 1.0
   */
  public class Scheduler {
  
      final private Logger logger = LoggerFactory.getLogger(getClass());
  
      final static AtomicLong threadId = new AtomicLong(0);
  
      final ScheduledThreadPoolExecutor executor;
  
      final String baseThreadName;
  
      public Scheduler(int numThreads, final String baseThreadName, final boolean isDaemon) {
          this.baseThreadName = baseThreadName;
          executor = new ScheduledThreadPoolExecutor(numThreads, new ThreadFactory() {
  
              public Thread newThread(Runnable r) {
                  Thread t = new Thread(r, baseThreadName + threadId.getAndIncrement());
                  t.setDaemon(isDaemon);
                  return t;
              }
          });
          executor.setContinueExistingPeriodicTasksAfterShutdownPolicy(false);
          executor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
      }
  
      public ScheduledFuture<?> scheduleWithRate(Runnable command, long delayMs, long periodMs) {
          return executor.scheduleAtFixedRate(command, delayMs, periodMs, TimeUnit.MILLISECONDS);
      }
  
      public void shutdownNow() {
          executor.shutdownNow();
          logger.info("ShutdownNow scheduler {} with {} threads.", baseThreadName, threadId.get());
      }
  
      public void shutdown() {
          executor.shutdown();
          logger.info("Shutdown scheduler {} with {} threads.", baseThreadName, threadId.get());
      }
  }
  