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