| /* |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| * Other contributors include Andrew Wright, Jeffrey Hayes, |
| * Pat Fisher, Mike Judd. |
| */ |
| |
| package jsr166; |
| |
| import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| |
| import java.util.concurrent.ArrayBlockingQueue; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorCompletionService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.FutureTask; |
| import java.util.concurrent.RunnableFuture; |
| import java.util.concurrent.ThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import junit.framework.Test; |
| import junit.framework.TestSuite; |
| |
| public class ExecutorCompletionServiceTest extends JSR166TestCase { |
| // android-note: Removed because the CTS runner does a bad job of |
| // retrying tests that have suite() declarations. |
| // |
| // public static void main(String[] args) { |
| // main(suite(), args); |
| // } |
| // public static Test suite() { |
| // return new TestSuite(...); |
| // } |
| |
| /** |
| * Creating a new ECS with null Executor throw NPE |
| */ |
| public void testConstructorNPE() { |
| try { |
| new ExecutorCompletionService(null); |
| shouldThrow(); |
| } catch (NullPointerException success) {} |
| } |
| |
| /** |
| * Creating a new ECS with null queue throw NPE |
| */ |
| public void testConstructorNPE2() { |
| try { |
| ExecutorService e = Executors.newCachedThreadPool(); |
| new ExecutorCompletionService(e, null); |
| shouldThrow(); |
| } catch (NullPointerException success) {} |
| } |
| |
| /** |
| * Submitting a null callable throws NPE |
| */ |
| public void testSubmitNPE() { |
| ExecutorService e = Executors.newCachedThreadPool(); |
| ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| try { |
| Callable c = null; |
| ecs.submit(c); |
| shouldThrow(); |
| } catch (NullPointerException success) { |
| } finally { |
| joinPool(e); |
| } |
| } |
| |
| /** |
| * Submitting a null runnable throws NPE |
| */ |
| public void testSubmitNPE2() { |
| ExecutorService e = Executors.newCachedThreadPool(); |
| ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| try { |
| Runnable r = null; |
| ecs.submit(r, Boolean.TRUE); |
| shouldThrow(); |
| } catch (NullPointerException success) { |
| } finally { |
| joinPool(e); |
| } |
| } |
| |
| /** |
| * A taken submitted task is completed |
| */ |
| public void testTake() throws InterruptedException { |
| ExecutorService e = Executors.newCachedThreadPool(); |
| ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| try { |
| Callable c = new StringTask(); |
| ecs.submit(c); |
| Future f = ecs.take(); |
| assertTrue(f.isDone()); |
| } finally { |
| joinPool(e); |
| } |
| } |
| |
| /** |
| * Take returns the same future object returned by submit |
| */ |
| public void testTake2() throws InterruptedException { |
| ExecutorService e = Executors.newCachedThreadPool(); |
| ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| try { |
| Callable c = new StringTask(); |
| Future f1 = ecs.submit(c); |
| Future f2 = ecs.take(); |
| assertSame(f1, f2); |
| } finally { |
| joinPool(e); |
| } |
| } |
| |
| /** |
| * If poll returns non-null, the returned task is completed |
| */ |
| public void testPoll1() throws Exception { |
| ExecutorService e = Executors.newCachedThreadPool(); |
| ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| try { |
| assertNull(ecs.poll()); |
| Callable c = new StringTask(); |
| ecs.submit(c); |
| |
| long startTime = System.nanoTime(); |
| Future f; |
| while ((f = ecs.poll()) == null) { |
| if (millisElapsedSince(startTime) > LONG_DELAY_MS) |
| fail("timed out"); |
| Thread.yield(); |
| } |
| assertTrue(f.isDone()); |
| assertSame(TEST_STRING, f.get()); |
| } finally { |
| joinPool(e); |
| } |
| } |
| |
| /** |
| * If timed poll returns non-null, the returned task is completed |
| */ |
| public void testPoll2() throws InterruptedException { |
| ExecutorService e = Executors.newCachedThreadPool(); |
| ExecutorCompletionService ecs = new ExecutorCompletionService(e); |
| try { |
| assertNull(ecs.poll()); |
| Callable c = new StringTask(); |
| ecs.submit(c); |
| Future f = ecs.poll(SHORT_DELAY_MS, MILLISECONDS); |
| if (f != null) |
| assertTrue(f.isDone()); |
| } finally { |
| joinPool(e); |
| } |
| } |
| |
| /** |
| * Submitting to underlying AES that overrides newTaskFor(Callable) |
| * returns and eventually runs Future returned by newTaskFor. |
| */ |
| public void testNewTaskForCallable() throws InterruptedException { |
| final AtomicBoolean done = new AtomicBoolean(false); |
| class MyCallableFuture<V> extends FutureTask<V> { |
| MyCallableFuture(Callable<V> c) { super(c); } |
| protected void done() { done.set(true); } |
| } |
| ExecutorService e = new ThreadPoolExecutor( |
| 1, 1, 30L, TimeUnit.SECONDS, |
| new ArrayBlockingQueue<Runnable>(1)) { |
| protected <T> RunnableFuture<T> newTaskFor(Callable<T> c) { |
| return new MyCallableFuture<T>(c); |
| }}; |
| ExecutorCompletionService<String> ecs = |
| new ExecutorCompletionService<String>(e); |
| try { |
| assertNull(ecs.poll()); |
| Callable<String> c = new StringTask(); |
| Future f1 = ecs.submit(c); |
| assertTrue("submit must return MyCallableFuture", |
| f1 instanceof MyCallableFuture); |
| Future f2 = ecs.take(); |
| assertSame("submit and take must return same objects", f1, f2); |
| assertTrue("completed task must have set done", done.get()); |
| } finally { |
| joinPool(e); |
| } |
| } |
| |
| /** |
| * Submitting to underlying AES that overrides newTaskFor(Runnable,T) |
| * returns and eventually runs Future returned by newTaskFor. |
| */ |
| public void testNewTaskForRunnable() throws InterruptedException { |
| final AtomicBoolean done = new AtomicBoolean(false); |
| class MyRunnableFuture<V> extends FutureTask<V> { |
| MyRunnableFuture(Runnable t, V r) { super(t, r); } |
| protected void done() { done.set(true); } |
| } |
| ExecutorService e = new ThreadPoolExecutor( |
| 1, 1, 30L, TimeUnit.SECONDS, |
| new ArrayBlockingQueue<Runnable>(1)) { |
| protected <T> RunnableFuture<T> newTaskFor(Runnable t, T r) { |
| return new MyRunnableFuture<T>(t, r); |
| }}; |
| ExecutorCompletionService<String> ecs = |
| new ExecutorCompletionService<String>(e); |
| try { |
| assertNull(ecs.poll()); |
| Runnable r = new NoOpRunnable(); |
| Future f1 = ecs.submit(r, null); |
| assertTrue("submit must return MyRunnableFuture", |
| f1 instanceof MyRunnableFuture); |
| Future f2 = ecs.take(); |
| assertSame("submit and take must return same objects", f1, f2); |
| assertTrue("completed task must have set done", done.get()); |
| } finally { |
| joinPool(e); |
| } |
| } |
| |
| } |