| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hbase.util; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.util.Arrays; |
| import java.util.Map; |
| import java.util.Random; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ExecutorCompletionService; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| import org.apache.hadoop.hbase.HBaseClassTestRule; |
| import org.apache.hadoop.hbase.testclassification.MediumTests; |
| import org.apache.hadoop.hbase.testclassification.MiscTests; |
| import org.apache.hadoop.hbase.util.IdReadWriteLockWithObjectPool.ReferenceType; |
| import org.junit.ClassRule; |
| import org.junit.Test; |
| import org.junit.experimental.categories.Category; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.Parameterized; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @RunWith(Parameterized.class) |
| @Category({MiscTests.class, MediumTests.class}) |
| // Medium as it creates 100 threads; seems better to run it isolated |
| public class TestIdReadWriteLockWithObjectPool { |
| |
| @ClassRule |
| public static final HBaseClassTestRule CLASS_RULE = |
| HBaseClassTestRule.forClass(TestIdReadWriteLockWithObjectPool.class); |
| |
| private static final Logger LOG = |
| LoggerFactory.getLogger(TestIdReadWriteLockWithObjectPool.class); |
| |
| private static final int NUM_IDS = 16; |
| private static final int NUM_THREADS = 128; |
| private static final int NUM_SECONDS = 15; |
| |
| @Parameterized.Parameter |
| public IdReadWriteLockWithObjectPool<Long> idLock; |
| |
| @Parameterized.Parameters |
| public static Iterable<Object[]> data() { |
| return Arrays.asList(new Object[][] { |
| { new IdReadWriteLockWithObjectPool<Long>(ReferenceType.WEAK) }, |
| { new IdReadWriteLockWithObjectPool<Long>(ReferenceType.SOFT) } }); |
| } |
| |
| private Map<Long, String> idOwner = new ConcurrentHashMap<>(); |
| |
| private class IdLockTestThread implements Callable<Boolean> { |
| |
| private String clientId; |
| |
| public IdLockTestThread(String clientId) { |
| this.clientId = clientId; |
| } |
| |
| @Override |
| public Boolean call() throws Exception { |
| Thread.currentThread().setName(clientId); |
| Random rand = new Random(); |
| long endTime = System.currentTimeMillis() + NUM_SECONDS * 1000; |
| while (System.currentTimeMillis() < endTime) { |
| long id = rand.nextInt(NUM_IDS); |
| boolean readLock = rand.nextBoolean(); |
| |
| ReentrantReadWriteLock readWriteLock = idLock.getLock(id); |
| Lock lock = readLock ? readWriteLock.readLock() : readWriteLock.writeLock(); |
| try { |
| lock.lock(); |
| int sleepMs = 1 + rand.nextInt(4); |
| String owner = idOwner.get(id); |
| if (owner != null && LOG.isDebugEnabled()) { |
| LOG.debug((readLock ? "Read" : "Write") + "lock of Id " + id + " already taken by " |
| + owner + ", we are " + clientId); |
| } |
| |
| idOwner.put(id, clientId); |
| Thread.sleep(sleepMs); |
| idOwner.remove(id); |
| |
| } finally { |
| lock.unlock(); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Release " + (readLock ? "Read" : "Write") + " lock of Id" + id + ", we are " |
| + clientId); |
| } |
| } |
| } |
| return true; |
| } |
| |
| } |
| |
| @Test |
| public void testMultipleClients() throws Exception { |
| ExecutorService exec = Executors.newFixedThreadPool(NUM_THREADS); |
| try { |
| ExecutorCompletionService<Boolean> ecs = new ExecutorCompletionService<>(exec); |
| for (int i = 0; i < NUM_THREADS; ++i) |
| ecs.submit(new IdLockTestThread("client_" + i)); |
| for (int i = 0; i < NUM_THREADS; ++i) { |
| Future<Boolean> result = ecs.take(); |
| assertTrue(result.get()); |
| } |
| int entryPoolSize = idLock.purgeAndGetEntryPoolSize(); |
| LOG.debug("Size of entry pool after gc and purge: " + entryPoolSize); |
| ReferenceType refType = idLock.getReferenceType(); |
| switch (refType) { |
| case WEAK: |
| // make sure the entry pool will be cleared after GC and purge call |
| assertEquals(0, entryPoolSize); |
| break; |
| case SOFT: |
| // make sure the entry pool won't be cleared when JVM memory is enough |
| // even after GC and purge call |
| assertEquals(NUM_IDS, entryPoolSize); |
| break; |
| default: |
| break; |
| } |
| } finally { |
| exec.shutdown(); |
| exec.awaitTermination(5000, TimeUnit.MILLISECONDS); |
| } |
| } |
| |
| |
| } |
| |