| /** |
| * 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.mapred; |
| |
| import java.io.IOException; |
| import java.io.PrintStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Random; |
| |
| import org.junit.Test; |
| |
| import junit.framework.Assert; |
| |
| public class TestSimulatorEngine { |
| private static final int TIME_WARP = 1000; |
| Random random = new Random(); |
| |
| public static class TestSimpleEvent extends SimulatorEvent { |
| public TestSimpleEvent(SimulatorEventListener listener, long timestamp) { |
| super(listener, timestamp); |
| } |
| } |
| |
| /** |
| * Handling each {@link TestComplexEvent1} of level n will produce another |
| * {@link TestComplexEvent1} of level n-1 and 4 {@link TestSimpleEvent}s when |
| * n>0, produce no event if n=0. All events are created with a random time |
| * stamp within 1000 units into the future. |
| */ |
| public static class TestComplexEvent1 extends SimulatorEvent { |
| private int level; |
| |
| public TestComplexEvent1(SimulatorEventListener listener, long timeStamp, |
| int level) { |
| super(listener, timeStamp); |
| this.level = level; |
| } |
| |
| public int getLevel() { |
| return level; |
| } |
| } |
| |
| /** |
| * Handling each {@link TestComplexEvent2} of level n will produce 2 |
| * {@link TestComplexEvent2}s of level n-1 and 1 {@link TestSimpleEvent} when |
| * n>0, produce no event if n=0. All events are created with a random time |
| * stamp within 1000 units into the future. |
| */ |
| public class TestComplexEvent2 extends TestComplexEvent1 { |
| public TestComplexEvent2(SimulatorEventListener listener, long timeStamp, |
| int level) { |
| super(listener, timeStamp, level); |
| } |
| } |
| |
| class TestListener implements SimulatorEventListener { |
| |
| @Override |
| public List<SimulatorEvent> accept(SimulatorEvent event) { |
| SimulatorEventListener listener = event.getListener(); |
| long now = event.getTimeStamp(); |
| if (event instanceof TestComplexEvent2) { |
| // ce2(n) -> 2*ce2(n-1) + se |
| int level = ((TestComplexEvent2) event).getLevel(); |
| if (level == 0) |
| return SimulatorEventQueue.EMPTY_EVENTS; |
| List<SimulatorEvent> response = new ArrayList<SimulatorEvent>(); |
| for (int i = 0; i < 2; i++) |
| response.add(new TestComplexEvent2(listener, |
| now + random.nextInt(TIME_WARP), |
| level-1)); |
| response.add(new TestSimpleEvent(listener, now + random.nextInt(TIME_WARP))); |
| return response; |
| } else if (event instanceof TestComplexEvent1) { |
| TestComplexEvent1 e = (TestComplexEvent1)event; |
| // ce1(n) -> ce1(n-1) + 4*se |
| if (e.getLevel() == 0) |
| return SimulatorEventQueue.EMPTY_EVENTS; |
| List<SimulatorEvent> response = new ArrayList<SimulatorEvent>(); |
| response.add(new TestComplexEvent1(listener, |
| now + random.nextInt(TIME_WARP), |
| e.getLevel()-1)); |
| for (int i = 0; i < 4; i++) |
| response.add(new TestSimpleEvent(listener, |
| now + random.nextInt(TIME_WARP))); |
| return response; |
| } else if (event instanceof TestSimpleEvent) { |
| return SimulatorEventQueue.EMPTY_EVENTS; |
| } else { |
| throw new IllegalArgumentException("unknown event type: " |
| + event.getClass()); |
| } |
| } |
| |
| @Override |
| public List<SimulatorEvent> init(long when) { |
| return null; |
| } |
| } |
| |
| public class TestSimulator1 extends SimulatorEngine { |
| |
| private int level = 10; |
| |
| @Override |
| protected void init() { |
| this.queue.add(new TestComplexEvent1(new TestListener(), |
| random.nextInt(TIME_WARP), level)); |
| } |
| |
| @Override |
| protected void summary(PrintStream out) { |
| out.println(queue.getCurrentTime() + ", " + queue.getEventCount() + |
| ", " + queue.getSize()); |
| Assert.assertEquals(5*level+1, queue.getEventCount()); |
| } |
| } |
| |
| public class TestSimulator2 extends SimulatorEngine { |
| |
| private int level = 10; |
| |
| @Override |
| protected void init() { |
| this.queue.add(new TestComplexEvent2(new TestListener(), |
| random.nextInt(TIME_WARP), level)); |
| } |
| |
| @Override |
| protected void summary(PrintStream out) { |
| out.println(queue.getCurrentTime() + ", " + queue.getEventCount() + |
| ", " + queue.getSize()); |
| Assert.assertEquals(3*(1<<level)-2, queue.getEventCount()); |
| } |
| } |
| |
| /** |
| * Test {@link SimulatorEngine} using {@link TestSimulator1}. Insert a |
| * {@link TestComplexEvent1} in the beginning. The simulation stops when the |
| * {@link SimulatorEventQueue} is empty. Total number of events processed is checked |
| * against expected number (5*level+1). |
| * @throws IOException |
| * @throws InterruptedException |
| */ |
| @Test |
| public void testComplex1() throws IOException, InterruptedException { |
| SimulatorEngine simulation = new TestSimulator1(); |
| simulation.run(); |
| } |
| |
| /** |
| * Test {@link SimulatorEngine} using {@link TestSimulator2}. Insert a |
| * {@link TestComplexEvent2} in the beginning. The simulation stops when the |
| * {@link SimulatorEventQueue} is empty. Total number of events processed is checked |
| * against expected number (3 * 2^level - 2). |
| * @throws IOException |
| * @throws InterruptedException |
| */ |
| @Test |
| public void testComplex2() throws IOException, InterruptedException { |
| SimulatorEngine simulation = new TestSimulator2(); |
| simulation.run(); |
| } |
| } |