| /** |
| * 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.curator.framework.recipes.queue; |
| |
| import static org.junit.jupiter.api.Assertions.assertEquals; |
| import static org.junit.jupiter.api.Assertions.assertNotNull; |
| import static org.junit.jupiter.api.Assertions.assertTrue; |
| import com.google.common.collect.Sets; |
| import org.apache.commons.math.stat.descriptive.SummaryStatistics; |
| import org.apache.curator.framework.CuratorFramework; |
| import org.apache.curator.framework.CuratorFrameworkFactory; |
| import org.apache.curator.framework.state.ConnectionState; |
| import org.apache.curator.framework.state.ConnectionStateListener; |
| import org.apache.curator.retry.RetryOneTime; |
| import org.apache.curator.test.BaseClassForTests; |
| import org.apache.curator.test.Timing; |
| import org.apache.curator.utils.CloseableUtils; |
| import org.junit.jupiter.api.Test; |
| |
| import java.util.Set; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| |
| public class TestQueueSharder extends BaseClassForTests |
| { |
| @Test |
| public void testDistribution() throws Exception |
| { |
| final int threshold = 100; |
| final int factor = 10; |
| |
| Timing timing = new Timing(); |
| CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1)); |
| QueueSharder<String, DistributedQueue<String>> sharder = null; |
| try |
| { |
| client.start(); |
| |
| final CountDownLatch latch = new CountDownLatch(1); |
| QueueConsumer<String> consumer = new QueueConsumer<String>() |
| { |
| @Override |
| public void consumeMessage(String message) throws Exception |
| { |
| latch.await(); |
| } |
| |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState newState) |
| { |
| } |
| }; |
| QueueAllocator<String, DistributedQueue<String>> distributedQueueAllocator = makeAllocator(consumer); |
| QueueSharderPolicies policies = QueueSharderPolicies.builder().newQueueThreshold(threshold).thresholdCheckMs(1).build(); |
| sharder = new QueueSharder<String, DistributedQueue<String>>(client, distributedQueueAllocator, "/queues", "/leader", policies); |
| sharder.start(); |
| |
| for ( int i = 0; i < (factor * threshold); ++i ) |
| { |
| sharder.getQueue().put(Integer.toString(i)); |
| Thread.sleep(5); |
| } |
| timing.forWaiting().sleepABit(); |
| |
| SummaryStatistics statistics = new SummaryStatistics(); |
| for ( String path : sharder.getQueuePaths() ) |
| { |
| int numChildren = client.checkExists().forPath(path).getNumChildren(); |
| assertTrue(numChildren > 0); |
| assertTrue(numChildren >= (threshold * .1)); |
| statistics.addValue(numChildren); |
| } |
| latch.countDown(); |
| |
| assertTrue(statistics.getMean() >= (threshold * .9)); |
| } |
| finally |
| { |
| timing.sleepABit(); // let queue clear |
| CloseableUtils.closeQuietly(sharder); |
| CloseableUtils.closeQuietly(client); |
| } |
| } |
| |
| @Test |
| public void testSharderWatchSync() throws Exception |
| { |
| Timing timing = new Timing(); |
| CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1)); |
| |
| final BlockingQueueConsumer<String> consumer = makeConsumer(null); |
| QueueAllocator<String, DistributedQueue<String>> distributedQueueAllocator = makeAllocator(consumer); |
| QueueSharderPolicies policies = QueueSharderPolicies.builder().newQueueThreshold(2).thresholdCheckMs(1).build(); |
| |
| QueueSharder<String, DistributedQueue<String>> sharder1 = new QueueSharder<String, DistributedQueue<String>>(client, distributedQueueAllocator, "/queues", "/leader", policies); |
| QueueSharder<String, DistributedQueue<String>> sharder2 = new QueueSharder<String, DistributedQueue<String>>(client, distributedQueueAllocator, "/queues", "/leader", policies); |
| try |
| { |
| client.start(); |
| sharder1.start(); |
| sharder2.start(); |
| |
| for ( int i = 0; i < 20; ++i ) |
| { |
| sharder1.getQueue().put(Integer.toString(i)); |
| } |
| timing.sleepABit(); |
| |
| assertTrue((sharder1.getShardQty() > 1) || (sharder2.getShardQty() > 1)); |
| timing.forWaiting().sleepABit(); |
| assertEquals(sharder1.getShardQty(), sharder2.getShardQty()); |
| } |
| finally |
| { |
| timing.sleepABit(); // let queues clear |
| CloseableUtils.closeQuietly(sharder1); |
| CloseableUtils.closeQuietly(sharder2); |
| CloseableUtils.closeQuietly(client); |
| } |
| } |
| |
| @Test |
| public void testSimpleDistributedQueue() throws Exception |
| { |
| Timing timing = new Timing(); |
| CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1)); |
| |
| final CountDownLatch latch = new CountDownLatch(1); |
| final BlockingQueueConsumer<String> consumer = makeConsumer(latch); |
| QueueAllocator<String, DistributedQueue<String>> distributedQueueAllocator = makeAllocator(consumer); |
| QueueSharderPolicies policies = QueueSharderPolicies.builder().newQueueThreshold(2).thresholdCheckMs(1).build(); |
| QueueSharder<String, DistributedQueue<String>> sharder = new QueueSharder<String, DistributedQueue<String>>(client, distributedQueueAllocator, "/queues", "/leader", policies); |
| try |
| { |
| client.start(); |
| sharder.start(); |
| |
| sharder.getQueue().put("one"); |
| sharder.getQueue().put("two"); |
| sharder.getQueue().put("three"); |
| sharder.getQueue().put("four"); |
| latch.countDown(); |
| timing.sleepABit(); |
| sharder.getQueue().put("five"); |
| sharder.getQueue().put("six"); |
| sharder.getQueue().put("seven"); |
| sharder.getQueue().put("eight"); |
| timing.sleepABit(); |
| |
| assertTrue(sharder.getShardQty() > 1); |
| |
| Set<String> consumed = Sets.newHashSet(); |
| for ( int i = 0; i < 8; ++i ) |
| { |
| String s = consumer.take(timing.forWaiting().milliseconds(), TimeUnit.MILLISECONDS); |
| assertNotNull(s); |
| consumed.add(s); |
| } |
| |
| assertEquals(consumed, Sets.newHashSet("one", "two", "three", "four", "five", "six", "seven", "eight")); |
| |
| int shardQty = sharder.getShardQty(); |
| sharder.close(); |
| |
| // check re-open |
| |
| sharder = new QueueSharder<String, DistributedQueue<String>>(client, distributedQueueAllocator, "/queues", "/leader", policies); |
| sharder.start(); |
| assertEquals(sharder.getShardQty(), shardQty); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(sharder); |
| CloseableUtils.closeQuietly(client); |
| } |
| } |
| |
| private QueueAllocator<String, DistributedQueue<String>> makeAllocator(final QueueConsumer<String> consumer) |
| { |
| final QueueSerializer<String> serializer = new QueueSerializer<String>() |
| { |
| @Override |
| public byte[] serialize(String item) |
| { |
| return item.getBytes(); |
| } |
| |
| @Override |
| public String deserialize(byte[] bytes) |
| { |
| return new String(bytes); |
| } |
| }; |
| return new QueueAllocator<String, DistributedQueue<String>>() |
| { |
| @Override |
| public DistributedQueue<String> allocateQueue(CuratorFramework client, String queuePath) |
| { |
| return QueueBuilder.<String>builder(client, consumer, serializer, queuePath).buildQueue(); |
| } |
| }; |
| } |
| |
| private BlockingQueueConsumer<String> makeConsumer(final CountDownLatch latch) |
| { |
| ConnectionStateListener connectionStateListener = new ConnectionStateListener() |
| { |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState newState) |
| { |
| } |
| }; |
| |
| return new BlockingQueueConsumer<String>(connectionStateListener) |
| { |
| @Override |
| public void consumeMessage(String message) throws Exception |
| { |
| if ( latch != null ) |
| { |
| latch.await(); |
| } |
| super.consumeMessage(message); |
| } |
| }; |
| } |
| } |