| /** |
| * 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.assertTrue; |
| |
| 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 org.apache.hadoop.hbase.HBaseClassTestRule; |
| import org.apache.hadoop.hbase.testclassification.MediumTests; |
| import org.apache.hadoop.hbase.testclassification.MiscTests; |
| import org.junit.ClassRule; |
| import org.junit.Test; |
| import org.junit.experimental.categories.Category; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @Category({MiscTests.class, MediumTests.class}) |
| // Medium as it creates 100 threads; seems better to run it isolated |
| public class TestIdLock { |
| |
| @ClassRule |
| public static final HBaseClassTestRule CLASS_RULE = |
| HBaseClassTestRule.forClass(TestIdLock.class); |
| |
| private static final Logger LOG = LoggerFactory.getLogger(TestIdLock.class); |
| |
| private static final int NUM_IDS = 16; |
| private static final int NUM_THREADS = 128; |
| private static final int NUM_SECONDS = 15; |
| |
| private IdLock idLock = new IdLock(); |
| |
| 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); |
| |
| IdLock.Entry lockEntry = idLock.getLockEntry(id); |
| try { |
| int sleepMs = 1 + rand.nextInt(4); |
| String owner = idOwner.get(id); |
| if (owner != null) { |
| LOG.error("Id " + id + " already taken by " + owner + ", " |
| + clientId + " failed"); |
| return false; |
| } |
| |
| idOwner.put(id, clientId); |
| Thread.sleep(sleepMs); |
| idOwner.remove(id); |
| |
| } finally { |
| idLock.releaseLockEntry(lockEntry); |
| } |
| } |
| 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()); |
| } |
| idLock.assertMapEmpty(); |
| } finally { |
| exec.shutdown(); |
| exec.awaitTermination(5000, TimeUnit.MILLISECONDS); |
| } |
| } |
| |
| |
| } |
| |