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.hamcrest.CoreMatchers.startsWith;
021import static org.junit.Assert.assertEquals;
022import static org.junit.Assert.assertThat;
023import static org.junit.Assert.assertTrue;
024import static org.junit.Assert.fail;
025
026import java.io.IOException;
027import java.util.concurrent.CompletableFuture;
028import java.util.concurrent.ExecutorService;
029import java.util.concurrent.Executors;
030import java.util.stream.Stream;
031import org.apache.hadoop.hbase.HBaseClassTestRule;
032import org.apache.hadoop.hbase.HBaseIOException;
033import org.apache.hadoop.hbase.testclassification.MiscTests;
034import org.apache.hadoop.hbase.testclassification.SmallTests;
035import org.junit.After;
036import org.junit.Before;
037import org.junit.ClassRule;
038import org.junit.Test;
039import org.junit.experimental.categories.Category;
040
041import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
042
043@Category({ MiscTests.class, SmallTests.class })
044public class TestFutureUtils {
045
046  @ClassRule
047  public static final HBaseClassTestRule CLASS_RULE =
048    HBaseClassTestRule.forClass(TestFutureUtils.class);
049
050  private ExecutorService executor;
051
052  @Before
053  public void setUp() {
054    executor = Executors.newFixedThreadPool(1, new ThreadFactoryBuilder().setDaemon(true).build());
055  }
056
057  @After
058  public void tearDown() {
059    executor.shutdownNow();
060  }
061
062  @Test
063  public void testRecordStackTrace() throws IOException {
064    CompletableFuture<Void> future = new CompletableFuture<>();
065    executor.execute(() -> future.completeExceptionally(new HBaseIOException("Inject error!")));
066    try {
067      FutureUtils.get(future);
068      fail("The future should have been completed exceptionally");
069    } catch (HBaseIOException e) {
070      assertEquals("Inject error!", e.getMessage());
071      StackTraceElement[] elements = e.getStackTrace();
072      assertThat(elements[0].toString(), startsWith("java.lang.Thread.getStackTrace"));
073      assertThat(elements[1].toString(),
074        startsWith("org.apache.hadoop.hbase.util.FutureUtils.setStackTrace"));
075      assertThat(elements[2].toString(),
076        startsWith("org.apache.hadoop.hbase.util.FutureUtils.rethrow"));
077      assertThat(elements[3].toString(),
078        startsWith("org.apache.hadoop.hbase.util.FutureUtils.get"));
079      assertThat(elements[4].toString(),
080        startsWith("org.apache.hadoop.hbase.util.TestFutureUtils.testRecordStackTrace"));
081      assertTrue(Stream.of(elements)
082        .anyMatch(element -> element.toString().contains("--------Future.get--------")));
083    } catch (Throwable t) {
084      throw new AssertionError("Caught unexpected Throwable", t);
085    }
086  }
087}