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.util;
019
020import static org.junit.Assert.assertTrue;
021
022import java.util.concurrent.atomic.AtomicBoolean;
023import org.apache.hadoop.hbase.HBaseClassTestRule;
024import org.apache.hadoop.hbase.testclassification.MiscTests;
025import org.apache.hadoop.hbase.testclassification.SmallTests;
026import org.junit.ClassRule;
027import org.junit.Test;
028import org.junit.experimental.categories.Category;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032@Category({ MiscTests.class, SmallTests.class })
033public class TestThreads {
034
035  @ClassRule
036  public static final HBaseClassTestRule CLASS_RULE =
037    HBaseClassTestRule.forClass(TestThreads.class);
038
039  private static final Logger LOG = LoggerFactory.getLogger(TestThreads.class);
040
041  private static final int SLEEP_TIME_MS = 3000;
042  private static final int TOLERANCE_MS = (int) (0.10 * SLEEP_TIME_MS);
043
044  private final AtomicBoolean wasInterrupted = new AtomicBoolean(false);
045
046  @Test
047  public void testSleepWithoutInterrupt() throws InterruptedException {
048    Thread sleeper = new Thread(new Runnable() {
049      @Override
050      public void run() {
051        LOG.debug("Sleeper thread: sleeping for " + SLEEP_TIME_MS);
052        Threads.sleepWithoutInterrupt(SLEEP_TIME_MS);
053        LOG.debug("Sleeper thread: finished sleeping");
054        wasInterrupted.set(Thread.currentThread().isInterrupted());
055      }
056    });
057    LOG.debug("Starting sleeper thread (" + SLEEP_TIME_MS + " ms)");
058    sleeper.start();
059    long startTime = EnvironmentEdgeManager.currentTime();
060    LOG.debug("Main thread: sleeping for 200 ms");
061    Threads.sleep(200);
062
063    LOG.debug("Interrupting the sleeper thread and sleeping for 500 ms");
064    sleeper.interrupt();
065    Threads.sleep(500);
066
067    LOG.debug("Interrupting the sleeper thread and sleeping for 800 ms");
068    sleeper.interrupt();
069    Threads.sleep(800);
070
071    LOG.debug("Interrupting the sleeper thread again");
072    sleeper.interrupt();
073    sleeper.join();
074
075    assertTrue("sleepWithoutInterrupt did not preserve the thread's " + "interrupted status",
076      wasInterrupted.get());
077
078    long timeElapsed = EnvironmentEdgeManager.currentTime() - startTime;
079    // We expect to wait at least SLEEP_TIME_MS, but we can wait more if there is a GC.
080    assertTrue("Elapsed time " + timeElapsed + " ms is out of the expected " + " sleep time of "
081      + SLEEP_TIME_MS, SLEEP_TIME_MS - timeElapsed < TOLERANCE_MS);
082    LOG.debug("Target sleep time: " + SLEEP_TIME_MS + ", time elapsed: " + timeElapsed);
083  }
084}