Here are the examples of the java api class java.util.concurrent.CompletionService taken from open source projects.
1. ExecutorCompletionServiceTest#testPollReturnsNull()
Project: openjdk
File: ExecutorCompletionServiceTest.java
File: ExecutorCompletionServiceTest.java
/** * poll returns null before the returned task is completed */ public void testPollReturnsNull() throws InterruptedException, ExecutionException { CompletionService cs = new ExecutorCompletionService(cachedThreadPool); final CountDownLatch proceed = new CountDownLatch(1); cs.submit(new Callable() { public String call() throws Exception { proceed.await(); return TEST_STRING; } }); assertNull(cs.poll()); assertNull(cs.poll(0L, MILLISECONDS)); assertNull(cs.poll(Long.MIN_VALUE, MILLISECONDS)); long startTime = System.nanoTime(); assertNull(cs.poll(timeoutMillis(), MILLISECONDS)); assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); proceed.countDown(); assertSame(TEST_STRING, cs.take().get()); }
2. ExecutorCompletionServiceTest#testPoll2()
Project: openjdk
File: ExecutorCompletionServiceTest.java
File: ExecutorCompletionServiceTest.java
/** * timed poll returns non-null when the returned task is completed */ public void testPoll2() throws InterruptedException, ExecutionException { CompletionService cs = new ExecutorCompletionService(cachedThreadPool); assertNull(cs.poll()); cs.submit(new StringTask()); long startTime = System.nanoTime(); Future f; while ((f = cs.poll(SHORT_DELAY_MS, MILLISECONDS)) == null) { if (millisElapsedSince(startTime) > LONG_DELAY_MS) fail("timed out"); Thread.yield(); } assertTrue(f.isDone()); assertSame(TEST_STRING, f.get()); }
3. ExecutorCompletionServiceTest#testPoll1()
Project: openjdk
File: ExecutorCompletionServiceTest.java
File: ExecutorCompletionServiceTest.java
/** * poll returns non-null when the returned task is completed */ public void testPoll1() throws InterruptedException, ExecutionException { CompletionService cs = new ExecutorCompletionService(cachedThreadPool); assertNull(cs.poll()); cs.submit(new StringTask()); long startTime = System.nanoTime(); Future f; while ((f = cs.poll()) == null) { if (millisElapsedSince(startTime) > LONG_DELAY_MS) fail("timed out"); Thread.yield(); } assertTrue(f.isDone()); assertSame(TEST_STRING, f.get()); }
4. ExecutorCompletionServiceTest#testTaskAssortment()
Project: openjdk
File: ExecutorCompletionServiceTest.java
File: ExecutorCompletionServiceTest.java
/** * successful and failed tasks are both returned */ public void testTaskAssortment() throws InterruptedException, ExecutionException { CompletionService cs = new ExecutorCompletionService(cachedThreadPool); ArithmeticException ex = new ArithmeticException(); for (int i = 0; i < 2; i++) { cs.submit(new StringTask()); cs.submit(callableThrowing(ex)); cs.submit(runnableThrowing(ex), null); } int normalCompletions = 0; int exceptionalCompletions = 0; for (int i = 0; i < 3 * 2; i++) { try { if (cs.take().get() == TEST_STRING) normalCompletions++; } catch (ExecutionException expected) { assertTrue(expected.getCause() instanceof ArithmeticException); exceptionalCompletions++; } } assertEquals(2 * 1, normalCompletions); assertEquals(2 * 2, exceptionalCompletions); assertNull(cs.poll()); }
5. ExecutorCompletionServiceTest#testTake()
Project: openjdk
File: ExecutorCompletionServiceTest.java
File: ExecutorCompletionServiceTest.java
/** * A taken submitted task is completed */ public void testTake() throws InterruptedException, ExecutionException { CompletionService cs = new ExecutorCompletionService(cachedThreadPool); cs.submit(new StringTask()); Future f = cs.take(); assertTrue(f.isDone()); assertSame(TEST_STRING, f.get()); }
6. ExecutorCompletionServiceTest#testTake2()
Project: openjdk
File: ExecutorCompletionServiceTest.java
File: ExecutorCompletionServiceTest.java
/** * Take returns the same future object returned by submit */ public void testTake2() throws InterruptedException { CompletionService cs = new ExecutorCompletionService(cachedThreadPool); Future f1 = cs.submit(new StringTask()); Future f2 = cs.take(); assertSame(f1, f2); }
7. ExecutorCompletionServiceTest#testSubmitNullRunnable()
Project: openjdk
File: ExecutorCompletionServiceTest.java
File: ExecutorCompletionServiceTest.java
/** * ecs.submit(null, val) throws NullPointerException */ public void testSubmitNullRunnable() { CompletionService cs = new ExecutorCompletionService(cachedThreadPool); try { cs.submit((Runnable) null, Boolean.TRUE); shouldThrow(); } catch (NullPointerException success) { } }
8. ExecutorCompletionServiceTest#testSubmitNullCallable()
Project: openjdk
File: ExecutorCompletionServiceTest.java
File: ExecutorCompletionServiceTest.java
/** * ecs.submit(null) throws NullPointerException */ public void testSubmitNullCallable() { CompletionService cs = new ExecutorCompletionService(cachedThreadPool); try { cs.submit((Callable) null); shouldThrow(); } catch (NullPointerException success) { } }