| /** |
| * 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.distributedlog.service.balancer; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertNotNull; |
| import static org.junit.Assert.assertNull; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assert.fail; |
| |
| import com.google.common.collect.Sets; |
| import java.net.InetSocketAddress; |
| import java.net.SocketAddress; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| import org.junit.Test; |
| |
| /** |
| * Test Case for {@link CountBasedStreamChooser}. |
| */ |
| public class TestCountBasedStreamChooser { |
| |
| @Test(timeout = 60000) |
| public void testEmptyStreamDistribution() { |
| try { |
| new CountBasedStreamChooser(new HashMap<SocketAddress, Set<String>>()); |
| fail("Should fail constructing stream chooser if the stream distribution is empty"); |
| } catch (IllegalArgumentException iae) { |
| // expected |
| } |
| } |
| |
| @Test(timeout = 60000) |
| public void testMultipleHostsWithEmptyStreams() { |
| for (int i = 1; i <= 3; i++) { |
| Map<SocketAddress, Set<String>> streamDistribution = new HashMap<SocketAddress, Set<String>>(); |
| int port = 1000; |
| for (int j = 0; j < i; j++) { |
| SocketAddress address = new InetSocketAddress("127.0.0.1", port + j); |
| streamDistribution.put(address, new HashSet<String>()); |
| } |
| |
| CountBasedStreamChooser chooser = new CountBasedStreamChooser(streamDistribution); |
| for (int k = 0; k < i + 1; k++) { |
| assertNull(chooser.choose()); |
| } |
| } |
| } |
| |
| @Test(timeout = 60000) |
| public void testSingleHostWithStreams() { |
| for (int i = 0; i < 3; i++) { |
| Map<SocketAddress, Set<String>> streamDistribution = new HashMap<SocketAddress, Set<String>>(); |
| |
| Set<String> streams = new HashSet<String>(); |
| for (int j = 0; j < 3; j++) { |
| streams.add("SingleHostStream-" + j); |
| } |
| |
| int port = 1000; |
| SocketAddress address = new InetSocketAddress("127.0.0.1", port); |
| streamDistribution.put(address, streams); |
| |
| for (int k = 1; k <= i; k++) { |
| address = new InetSocketAddress("127.0.0.1", port + k); |
| streamDistribution.put(address, new HashSet<String>()); |
| } |
| |
| Set<String> choosenStreams = new HashSet<String>(); |
| |
| CountBasedStreamChooser chooser = new CountBasedStreamChooser(streamDistribution); |
| for (int l = 0; l < 3 + i + 1; l++) { |
| String s = chooser.choose(); |
| if (null != s) { |
| choosenStreams.add(s); |
| } |
| } |
| |
| assertEquals(streams.size(), choosenStreams.size()); |
| assertTrue(Sets.difference(streams, choosenStreams).immutableCopy().isEmpty()); |
| } |
| } |
| |
| @Test(timeout = 60000) |
| public void testHostsHaveSameNumberStreams() { |
| Map<SocketAddress, Set<String>> streamDistribution = new HashMap<SocketAddress, Set<String>>(); |
| Set<String> allStreams = new HashSet<String>(); |
| |
| int numHosts = 3; |
| int numStreamsPerHost = 3; |
| |
| int port = 1000; |
| for (int i = 1; i <= numHosts; i++) { |
| SocketAddress address = new InetSocketAddress("127.0.0.1", port + i); |
| Set<String> streams = new HashSet<String>(); |
| |
| for (int j = 1; j <= numStreamsPerHost; j++) { |
| String streamName = "HostsHaveSameNumberStreams-" + i + "-" + j; |
| streams.add(streamName); |
| allStreams.add(streamName); |
| } |
| |
| streamDistribution.put(address, streams); |
| } |
| |
| Set<String> streamsChoosen = new HashSet<String>(); |
| CountBasedStreamChooser chooser = new CountBasedStreamChooser(streamDistribution); |
| for (int i = 1; i <= numStreamsPerHost; i++) { |
| for (int j = 1; j <= numHosts; j++) { |
| String s = chooser.choose(); |
| assertNotNull(s); |
| streamsChoosen.add(s); |
| } |
| for (int j = 0; j < numHosts; j++) { |
| assertEquals(numStreamsPerHost - i, chooser.streamsDistribution.get(j).getRight().size()); |
| } |
| } |
| assertNull(chooser.choose()); |
| assertEquals(numHosts * numStreamsPerHost, streamsChoosen.size()); |
| assertTrue(Sets.difference(allStreams, streamsChoosen).isEmpty()); |
| } |
| |
| @Test(timeout = 60000) |
| public void testHostsHaveDifferentNumberStreams() { |
| Map<SocketAddress, Set<String>> streamDistribution = new HashMap<SocketAddress, Set<String>>(); |
| Set<String> allStreams = new HashSet<String>(); |
| |
| int numHosts = 6; |
| int maxStreamsPerHost = 4; |
| |
| int port = 1000; |
| for (int i = 0; i < numHosts; i++) { |
| int group = i / 2; |
| int numStreamsThisGroup = maxStreamsPerHost - group; |
| |
| SocketAddress address = new InetSocketAddress("127.0.0.1", port + i); |
| Set<String> streams = new HashSet<String>(); |
| |
| for (int j = 1; j <= numStreamsThisGroup; j++) { |
| String streamName = "HostsHaveDifferentNumberStreams-" + i + "-" + j; |
| streams.add(streamName); |
| allStreams.add(streamName); |
| } |
| |
| streamDistribution.put(address, streams); |
| } |
| |
| Set<String> streamsChoosen = new HashSet<String>(); |
| CountBasedStreamChooser chooser = new CountBasedStreamChooser(streamDistribution); |
| |
| for (int i = 0; i < allStreams.size(); i++) { |
| String s = chooser.choose(); |
| assertNotNull(s); |
| streamsChoosen.add(s); |
| } |
| assertNull(chooser.choose()); |
| assertEquals(allStreams.size(), streamsChoosen.size()); |
| assertTrue(Sets.difference(allStreams, streamsChoosen).isEmpty()); |
| } |
| |
| @Test(timeout = 60000) |
| public void testLimitedStreamChooser() { |
| Map<SocketAddress, Set<String>> streamDistribution = new HashMap<SocketAddress, Set<String>>(); |
| |
| Set<String> streams = new HashSet<String>(); |
| for (int j = 0; j < 10; j++) { |
| streams.add("SingleHostStream-" + j); |
| } |
| |
| int port = 1000; |
| SocketAddress address = new InetSocketAddress("127.0.0.1", port); |
| streamDistribution.put(address, streams); |
| |
| Set<String> choosenStreams = new HashSet<String>(); |
| |
| CountBasedStreamChooser underlying = new CountBasedStreamChooser(streamDistribution); |
| LimitedStreamChooser chooser = LimitedStreamChooser.of(underlying, 1); |
| for (int l = 0; l < 10; l++) { |
| String s = chooser.choose(); |
| if (null != s) { |
| choosenStreams.add(s); |
| } |
| } |
| |
| assertEquals(1, choosenStreams.size()); |
| } |
| } |