| /** |
| * Copyright 2016 Yahoo Inc. |
| * |
| * Licensed 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 com.yahoo.pulsar.broker.service; |
| |
| import static org.testng.Assert.assertEquals; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.CyclicBarrier; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| |
| import org.apache.zookeeper.CreateMode; |
| import org.apache.zookeeper.MockZooKeeper; |
| import org.apache.zookeeper.ZooDefs; |
| import org.testng.annotations.AfterClass; |
| import org.testng.annotations.BeforeClass; |
| import org.testng.annotations.Test; |
| |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Sets; |
| import com.yahoo.pulsar.broker.service.DistributedIdGenerator; |
| |
| @Test |
| public class DistributedIdGeneratorTest { |
| |
| private MockZooKeeper zkc; |
| |
| @BeforeClass |
| public void setup() throws Exception { |
| zkc = MockZooKeeper.newInstance(); |
| } |
| |
| @AfterClass |
| public void teardown() throws Exception { |
| zkc.shutdown(); |
| } |
| |
| @Test |
| public void simple() throws Exception { |
| DistributedIdGenerator gen1 = new DistributedIdGenerator(zkc, "/my/test/simple", "p"); |
| |
| assertEquals(gen1.getNextId(), "p-0-0"); |
| assertEquals(gen1.getNextId(), "p-0-1"); |
| assertEquals(gen1.getNextId(), "p-0-2"); |
| assertEquals(gen1.getNextId(), "p-0-3"); |
| |
| DistributedIdGenerator gen2 = new DistributedIdGenerator(zkc, "/my/test/simple", "p"); |
| assertEquals(gen2.getNextId(), "p-1-0"); |
| assertEquals(gen2.getNextId(), "p-1-1"); |
| |
| assertEquals(gen1.getNextId(), "p-0-4"); |
| assertEquals(gen2.getNextId(), "p-1-2"); |
| } |
| |
| /** |
| * Use multiple threads to generate many Id. Ensure no holes and no dups in the sequence |
| */ |
| @Test |
| public void concurrent() throws Exception { |
| int Threads = 10; |
| int Iterations = 100; |
| |
| CyclicBarrier barrier = new CyclicBarrier(Threads); |
| CountDownLatch counter = new CountDownLatch(Threads); |
| ExecutorService executor = Executors.newCachedThreadPool(); |
| |
| List<String> results = Collections.synchronizedList(Lists.newArrayList()); |
| |
| for (int i = 0; i < Threads; i++) { |
| executor.execute(() -> { |
| try { |
| DistributedIdGenerator gen = new DistributedIdGenerator(zkc, "/my/test/concurrent", "prefix"); |
| |
| barrier.await(); |
| |
| for (int j = 0; j < Iterations; j++) { |
| results.add(gen.getNextId()); |
| } |
| |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } finally { |
| counter.countDown(); |
| } |
| }); |
| } |
| |
| counter.await(); |
| |
| assertEquals(results.size(), Threads * Iterations); |
| |
| // Check the list contains no duplicates |
| Set<String> set = Sets.newHashSet(results); |
| assertEquals(set.size(), results.size()); |
| |
| executor.shutdown(); |
| } |
| |
| @Test |
| public void invalidZnode() throws Exception { |
| zkc.create("/my/test/invalid", "invalid-number".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); |
| |
| DistributedIdGenerator gen = new DistributedIdGenerator(zkc, "/my/test/invalid", "p"); |
| |
| // It should not get exception if content is there |
| assertEquals(gen.getNextId(), "p-0-0"); |
| } |
| } |