001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.procedure2;
019
020import org.apache.hadoop.hbase.procedure2.util.StringUtils;
021import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
022import org.apache.yetus.audience.InterfaceAudience;
023import org.slf4j.Logger;
024import org.slf4j.LoggerFactory;
025
026@InterfaceAudience.Private
027abstract class StoppableThread extends Thread {
028
029  private static final Logger LOG = LoggerFactory.getLogger(StoppableThread.class);
030
031  public StoppableThread(final ThreadGroup group, final String name) {
032    super(group, name);
033  }
034
035  public abstract void sendStopSignal();
036
037  public void awaitTermination() {
038    try {
039      final long startTime = EnvironmentEdgeManager.currentTime();
040      for (int i = 0; isAlive(); ++i) {
041        sendStopSignal();
042        join(250);
043        // Log every two seconds; send interrupt too.
044        if (i > 0 && (i % 8) == 0) {
045          LOG.warn("Waiting termination of thread {}, {}; sending interrupt", getName(),
046            StringUtils.humanTimeDiff(EnvironmentEdgeManager.currentTime() - startTime));
047          interrupt();
048        }
049      }
050    } catch (InterruptedException e) {
051      LOG.warn("{} join wait got interrupted", getName(), e);
052    }
053  }
054}