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.regionserver.wal;
019
020import static org.junit.Assert.assertEquals;
021import static org.junit.Assert.assertNotNull;
022import static org.junit.Assert.assertNotSame;
023
024import java.util.concurrent.CompletableFuture;
025import org.apache.hadoop.conf.Configuration;
026import org.apache.hadoop.hbase.HBaseClassTestRule;
027import org.apache.hadoop.hbase.HBaseConfiguration;
028import org.apache.hadoop.hbase.testclassification.RegionServerTests;
029import org.apache.hadoop.hbase.testclassification.SmallTests;
030import org.junit.ClassRule;
031import org.junit.Test;
032import org.junit.experimental.categories.Category;
033
034@Category({ RegionServerTests.class, SmallTests.class })
035public class TestSyncFutureCache {
036
037  @ClassRule
038  public static final HBaseClassTestRule CLASS_RULE =
039    HBaseClassTestRule.forClass(TestSyncFutureCache.class);
040
041  @Test
042  public void testSyncFutureCacheLifeCycle() throws Exception {
043    final Configuration conf = HBaseConfiguration.create();
044    SyncFutureCache cache = new SyncFutureCache(conf);
045    try {
046      SyncFuture future0 = cache.getIfPresentOrNew().reset(0, false);
047      assertNotNull(future0);
048      // Get another future from the same thread, should be different one.
049      SyncFuture future1 = cache.getIfPresentOrNew().reset(1, false);
050      assertNotNull(future1);
051      assertNotSame(future0, future1);
052      cache.offer(future1);
053      // Should override.
054      cache.offer(future0);
055      SyncFuture future3 = cache.getIfPresentOrNew();
056      assertEquals(future3, future0);
057      final SyncFuture[] future4 = new SyncFuture[1];
058      // From a different thread
059      CompletableFuture.runAsync(() -> future4[0] = cache.getIfPresentOrNew().reset(4, false))
060        .get();
061      assertNotNull(future4[0]);
062      assertNotSame(future3, future4[0]);
063      // Clean up
064      cache.offer(future3);
065      cache.offer(future4[0]);
066    } finally {
067      cache.clear();
068    }
069  }
070}