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 com.alibaba.jstorm.callback;
  
  import com.google.common.annotations.VisibleForTesting;
  import java.lang.Thread.UncaughtExceptionHandler;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import backtype.storm.utils.Time;
  
  import com.alibaba.jstorm.utils.JStormUtils;
  import com.alibaba.jstorm.utils.SmartThread;
  
  /**
   * wraps timer thread to execute afn every several seconds, if an exception is thrown, run killFn
   *
   * @author yannian
   */
  public class AsyncLoopThread implements SmartThread {
      private static final Logger LOG = LoggerFactory.getLogger(AsyncLoopThread.class);
  
      private Thread thread;
      private RunnableCallback afn;
  
      public AsyncLoopThread(RunnableCallback afn) {
          this.init(afn, false, Thread.NORM_PRIORITY, true);
      }
  
      public AsyncLoopThread(RunnableCallback afn, boolean daemon, int priority, boolean start) {
          this.init(afn, daemon, priority, start);
      }
  
      public AsyncLoopThread(RunnableCallback afn, boolean daemon, RunnableCallback kill_fn, int priority, boolean start) {
          this.init(afn, daemon, kill_fn, priority, start);
      }
  
      public void init(RunnableCallback afn, boolean daemon, int priority, boolean start) {
          RunnableCallback kill_fn = new AsyncLoopDefaultKill();
          this.init(afn, daemon, kill_fn, priority, start);
      }
  
      private void init(RunnableCallback afn, boolean daemon, RunnableCallback kill_fn, int priority, boolean start) {
          if (kill_fn == null) {
              kill_fn = new AsyncLoopDefaultKill();
          }
  
          Runnable runnable = new AsyncLoopRunnable(afn, kill_fn);
          thread = new Thread(runnable);
          String threadName = afn.getThreadName();
          if (threadName == null) {
              threadName = afn.getClass().getSimpleName();
          }
          thread.setName(threadName);
          thread.setDaemon(daemon);
          thread.setPriority(priority);
          thread.setUncaughtExceptionHandler(new UncaughtExceptionHandler() {
              @Override
              public void uncaughtException(Thread t, Throwable e) {
                  LOG.error("UncaughtException", e);
                  JStormUtils.halt_process(1, "UncaughtException");
              }
          });
  
          this.afn = afn;
  
          if (start) {
              thread.start();
          }
      }
  
      @Override
      public void start() {
          thread.start();
      }
  
      @Override
      public void join() throws InterruptedException {
          thread.join();
      }
  
      @VisibleForTesting
      public void join(int times) throws InterruptedException {
          thread.join(times);
      }
  
      @Override
      public void interrupt() {
          thread.interrupt();
      }
  
      @Override
      public Boolean isSleeping() {
          return Time.isThreadWaiting(thread);
      }
  
      public Thread getThread() {
          return thread;
      }
  
      @Override
      public void cleanup() {
          afn.shutdown();
      }
  }
  