Calin Juravle | 8f0d92b | 2013-08-01 17:26:00 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Written by Doug Lea with assistance from members of JCP JSR-166 |
| 3 | * Expert Group and released to the public domain, as explained at |
| 4 | * http://creativecommons.org/publicdomain/zero/1.0/ |
| 5 | * Other contributors include Andrew Wright, Jeffrey Hayes, |
| 6 | * Pat Fisher, Mike Judd. |
| 7 | */ |
| 8 | |
| 9 | package jsr166; |
| 10 | |
| 11 | import junit.framework.*; |
| 12 | import java.util.*; |
| 13 | import java.util.concurrent.ArrayBlockingQueue; |
| 14 | import java.util.concurrent.Callable; |
| 15 | import java.util.concurrent.ExecutorCompletionService; |
| 16 | import java.util.concurrent.ExecutorService; |
| 17 | import java.util.concurrent.Executors; |
| 18 | import java.util.concurrent.Future; |
| 19 | import java.util.concurrent.FutureTask; |
| 20 | import java.util.concurrent.RunnableFuture; |
| 21 | import java.util.concurrent.ThreadPoolExecutor; |
| 22 | import java.util.concurrent.TimeUnit; |
| 23 | import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| 24 | import java.util.concurrent.atomic.AtomicBoolean; |
| 25 | import java.security.*; |
| 26 | |
| 27 | public class ExecutorCompletionServiceTest extends JSR166TestCase { |
| 28 | |
| 29 | /** |
| 30 | * Creating a new ECS with null Executor throw NPE |
| 31 | */ |
| 32 | public void testConstructorNPE() { |
| 33 | try { |
| 34 | ExecutorCompletionService ecs = new ExecutorCompletionService(null); |
| 35 | shouldThrow(); |
| 36 | } catch (NullPointerException success) {} |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * Creating a new ECS with null queue throw NPE |
| 41 | */ |
| 42 | public void testConstructorNPE2() { |
| 43 | try { |
| 44 | ExecutorService e = Executors.newCachedThreadPool(); |
| 45 | ExecutorCompletionService ecs = new ExecutorCompletionService(e, null); |
| 46 | shouldThrow(); |
| 47 | } catch (NullPointerException success) {} |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Submitting a null callable throws NPE |
| 52 | */ |
| 53 | public void testSubmitNPE() { |
| 54 | ExecutorService e = Executors.newCachedThreadPool(); |
| 55 | ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| 56 | try { |
| 57 | Callable c = null; |
| 58 | ecs.submit(c); |
| 59 | shouldThrow(); |
| 60 | } catch (NullPointerException success) { |
| 61 | } finally { |
| 62 | joinPool(e); |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Submitting a null runnable throws NPE |
| 68 | */ |
| 69 | public void testSubmitNPE2() { |
| 70 | ExecutorService e = Executors.newCachedThreadPool(); |
| 71 | ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| 72 | try { |
| 73 | Runnable r = null; |
| 74 | ecs.submit(r, Boolean.TRUE); |
| 75 | shouldThrow(); |
| 76 | } catch (NullPointerException success) { |
| 77 | } finally { |
| 78 | joinPool(e); |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * A taken submitted task is completed |
| 84 | */ |
| 85 | public void testTake() throws InterruptedException { |
| 86 | ExecutorService e = Executors.newCachedThreadPool(); |
| 87 | ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| 88 | try { |
| 89 | Callable c = new StringTask(); |
| 90 | ecs.submit(c); |
| 91 | Future f = ecs.take(); |
| 92 | assertTrue(f.isDone()); |
| 93 | } finally { |
| 94 | joinPool(e); |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * Take returns the same future object returned by submit |
| 100 | */ |
| 101 | public void testTake2() throws InterruptedException { |
| 102 | ExecutorService e = Executors.newCachedThreadPool(); |
| 103 | ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| 104 | try { |
| 105 | Callable c = new StringTask(); |
| 106 | Future f1 = ecs.submit(c); |
| 107 | Future f2 = ecs.take(); |
| 108 | assertSame(f1, f2); |
| 109 | } finally { |
| 110 | joinPool(e); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * If poll returns non-null, the returned task is completed |
| 116 | */ |
| 117 | public void testPoll1() throws Exception { |
| 118 | ExecutorService e = Executors.newCachedThreadPool(); |
| 119 | ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| 120 | try { |
| 121 | assertNull(ecs.poll()); |
| 122 | Callable c = new StringTask(); |
| 123 | ecs.submit(c); |
| 124 | |
| 125 | long startTime = System.nanoTime(); |
| 126 | Future f; |
| 127 | while ((f = ecs.poll()) == null) { |
| 128 | if (millisElapsedSince(startTime) > LONG_DELAY_MS) |
| 129 | fail("timed out"); |
| 130 | Thread.yield(); |
| 131 | } |
| 132 | assertTrue(f.isDone()); |
| 133 | assertSame(TEST_STRING, f.get()); |
| 134 | } finally { |
| 135 | joinPool(e); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * If timed poll returns non-null, the returned task is completed |
| 141 | */ |
| 142 | public void testPoll2() throws InterruptedException { |
| 143 | ExecutorService e = Executors.newCachedThreadPool(); |
| 144 | ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| 145 | try { |
| 146 | assertNull(ecs.poll()); |
| 147 | Callable c = new StringTask(); |
| 148 | ecs.submit(c); |
| 149 | Future f = ecs.poll(SHORT_DELAY_MS, MILLISECONDS); |
| 150 | if (f != null) |
| 151 | assertTrue(f.isDone()); |
| 152 | } finally { |
| 153 | joinPool(e); |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Submitting to underlying AES that overrides newTaskFor(Callable) |
| 159 | * returns and eventually runs Future returned by newTaskFor. |
| 160 | */ |
| 161 | public void testNewTaskForCallable() throws InterruptedException { |
| 162 | final AtomicBoolean done = new AtomicBoolean(false); |
| 163 | class MyCallableFuture<V> extends FutureTask<V> { |
| 164 | MyCallableFuture(Callable<V> c) { super(c); } |
| 165 | protected void done() { done.set(true); } |
| 166 | } |
| 167 | ExecutorService e = new ThreadPoolExecutor( |
| 168 | 1, 1, 30L, TimeUnit.SECONDS, |
| 169 | new ArrayBlockingQueue<Runnable>(1)) { |
| 170 | protected <T> RunnableFuture<T> newTaskFor(Callable<T> c) { |
| 171 | return new MyCallableFuture<T>(c); |
| 172 | }}; |
| 173 | ExecutorCompletionService<String> ecs = |
| 174 | new ExecutorCompletionService<String>(e); |
| 175 | try { |
| 176 | assertNull(ecs.poll()); |
| 177 | Callable<String> c = new StringTask(); |
| 178 | Future f1 = ecs.submit(c); |
| 179 | assertTrue("submit must return MyCallableFuture", |
| 180 | f1 instanceof MyCallableFuture); |
| 181 | Future f2 = ecs.take(); |
| 182 | assertSame("submit and take must return same objects", f1, f2); |
| 183 | assertTrue("completed task must have set done", done.get()); |
| 184 | } finally { |
| 185 | joinPool(e); |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * Submitting to underlying AES that overrides newTaskFor(Runnable,T) |
| 191 | * returns and eventually runs Future returned by newTaskFor. |
| 192 | */ |
| 193 | public void testNewTaskForRunnable() throws InterruptedException { |
| 194 | final AtomicBoolean done = new AtomicBoolean(false); |
| 195 | class MyRunnableFuture<V> extends FutureTask<V> { |
| 196 | MyRunnableFuture(Runnable t, V r) { super(t, r); } |
| 197 | protected void done() { done.set(true); } |
| 198 | } |
| 199 | ExecutorService e = new ThreadPoolExecutor( |
| 200 | 1, 1, 30L, TimeUnit.SECONDS, |
| 201 | new ArrayBlockingQueue<Runnable>(1)) { |
| 202 | protected <T> RunnableFuture<T> newTaskFor(Runnable t, T r) { |
| 203 | return new MyRunnableFuture<T>(t, r); |
| 204 | }}; |
| 205 | ExecutorCompletionService<String> ecs = |
| 206 | new ExecutorCompletionService<String>(e); |
| 207 | try { |
| 208 | assertNull(ecs.poll()); |
| 209 | Runnable r = new NoOpRunnable(); |
| 210 | Future f1 = ecs.submit(r, null); |
| 211 | assertTrue("submit must return MyRunnableFuture", |
| 212 | f1 instanceof MyRunnableFuture); |
| 213 | Future f2 = ecs.take(); |
| 214 | assertSame("submit and take must return same objects", f1, f2); |
| 215 | assertTrue("completed task must have set done", done.get()); |
| 216 | } finally { |
| 217 | joinPool(e); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | } |