--- jsr166/src/test/tck/ExecutorCompletionServiceTest.java	2011/05/27 19:42:42	1.15
+++ jsr166/src/test/tck/ExecutorCompletionServiceTest.java	2021/01/26 13:33:06	1.30
@@ -6,146 +6,181 @@
  * Pat Fisher, Mike Judd.
  */
 
-import junit.framework.*;
-import java.util.*;
-import java.util.concurrent.*;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
-import java.util.concurrent.atomic.*;
-import java.math.BigInteger;
-import java.security.*;
+
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.Callable;
+import java.util.concurrent.CompletionService;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorCompletionService;
+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 {
     public static void main(String[] args) {
-        junit.textui.TestRunner.run(suite());
+        main(suite(), args);
     }
     public static Test suite() {
         return new TestSuite(ExecutorCompletionServiceTest.class);
     }
 
     /**
-     * Creating a new ECS with null Executor throw NPE
+     * new ExecutorCompletionService(null) throws NullPointerException
      */
     public void testConstructorNPE() {
         try {
-            ExecutorCompletionService ecs = new ExecutorCompletionService(null);
+            new ExecutorCompletionService<Item>(null);
             shouldThrow();
         } catch (NullPointerException success) {}
     }
 
     /**
-     * Creating a new ECS with null queue throw NPE
+     * new ExecutorCompletionService(e, null) throws NullPointerException
      */
     public void testConstructorNPE2() {
         try {
-            ExecutorService e = Executors.newCachedThreadPool();
-            ExecutorCompletionService ecs = new ExecutorCompletionService(e, null);
+            new ExecutorCompletionService<Item>(cachedThreadPool, null);
             shouldThrow();
         } catch (NullPointerException success) {}
     }
 
     /**
-     * Submitting a null callable throws NPE
+     * ecs.submit(null) throws NullPointerException
      */
-    public void testSubmitNPE() {
-        ExecutorService e = Executors.newCachedThreadPool();
-        ExecutorCompletionService ecs = new ExecutorCompletionService(e);
+    public void testSubmitNullCallable() {
+        CompletionService<Item> cs = new ExecutorCompletionService<Item>(cachedThreadPool);
         try {
-            Callable c = null;
-            ecs.submit(c);
+            cs.submit((Callable<Item>) null);
             shouldThrow();
-        } catch (NullPointerException success) {
-        } finally {
-            joinPool(e);
-        }
+        } catch (NullPointerException success) {}
     }
 
     /**
-     * Submitting a null runnable throws NPE
+     * ecs.submit(null, val) throws NullPointerException
      */
-    public void testSubmitNPE2() {
-        ExecutorService e = Executors.newCachedThreadPool();
-        ExecutorCompletionService ecs = new ExecutorCompletionService(e);
+    public void testSubmitNullRunnable() {
+        CompletionService<Boolean> cs = new ExecutorCompletionService<Boolean>(cachedThreadPool);
         try {
-            Runnable r = null;
-            ecs.submit(r, Boolean.TRUE);
+            cs.submit((Runnable) null, Boolean.TRUE);
             shouldThrow();
-        } catch (NullPointerException success) {
-        } finally {
-            joinPool(e);
-        }
+        } catch (NullPointerException success) {}
     }
 
     /**
      * 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);
-        }
+    public void testTake() throws Exception {
+        CompletionService<String> cs = new ExecutorCompletionService<String>(cachedThreadPool);
+        cs.submit(new StringTask());
+        Future<?> f = cs.take();
+        assertTrue(f.isDone());
+        assertSame(TEST_STRING, f.get());
     }
 
     /**
      * 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 InterruptedException {
-        ExecutorService e = Executors.newCachedThreadPool();
-        ExecutorCompletionService ecs = new ExecutorCompletionService(e);
-        try {
-            assertNull(ecs.poll());
-            Callable c = new StringTask();
-            ecs.submit(c);
-            delay(SHORT_DELAY_MS);
-            for (;;) {
-                Future f = ecs.poll();
-                if (f != null) {
-                    assertTrue(f.isDone());
-                    break;
-                }
+        CompletionService<String> cs = new ExecutorCompletionService<String>(cachedThreadPool);
+        Future<?> f1 = cs.submit(new StringTask());
+        Future<?> f2 = cs.take();
+        assertSame(f1, f2);
+    }
+
+    /**
+     * poll returns non-null when the returned task is completed
+     */
+    public void testPoll1() throws Exception {
+        CompletionService<String> cs = new ExecutorCompletionService<String>(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());
+    }
+
+    /**
+     * timed poll returns non-null when the returned task is completed
+     */
+    public void testPoll2() throws Exception {
+        CompletionService<String> cs = new ExecutorCompletionService<String>(cachedThreadPool);
+        assertNull(cs.poll());
+        cs.submit(new StringTask());
+
+        long startTime = System.nanoTime();
+        Future<?> f;
+        while ((f = cs.poll(timeoutMillis(), MILLISECONDS)) == null) {
+            assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
+            if (millisElapsedSince(startTime) > LONG_DELAY_MS)
+                fail("timed out");
+            Thread.yield();
+        }
+        assertTrue(f.isDone());
+        assertSame(TEST_STRING, f.get());
+    }
+
+    /**
+     * poll returns null before the returned task is completed
+     */
+    public void testPollReturnsNullBeforeCompletion() throws Exception {
+        CompletionService<String> cs = new ExecutorCompletionService<String>(cachedThreadPool);
+        final CountDownLatch proceed = new CountDownLatch(1);
+        cs.submit(new Callable<String>() { public String call() throws Exception {
+            await(proceed);
+            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());
+    }
+
+    /**
+     * successful and failed tasks are both returned
+     */
+    public void testTaskAssortment() throws Exception {
+        CompletionService<String> cs = new ExecutorCompletionService<String>(cachedThreadPool);
+        ArithmeticException ex = new ArithmeticException();
+        final int rounds = 2;
+        for (int i = rounds; i--> 0; ) {
+            cs.submit(new StringTask());
+            cs.submit(callableThrowing(ex));
+            cs.submit(runnableThrowing(ex), null);
+        }
+        int normalCompletions = 0;
+        int exceptionalCompletions = 0;
+        for (int i = 3 * rounds; i--> 0; ) {
+            try {
+                assertSame(TEST_STRING, cs.take().get());
+                normalCompletions++;
+            } catch (ExecutionException expected) {
+                assertSame(ex, expected.getCause());
+                exceptionalCompletions++;
             }
-        } 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);
         }
+        assertEquals(1 * rounds, normalCompletions);
+        assertEquals(2 * rounds, exceptionalCompletions);
+        assertNull(cs.poll());
     }
 
     /**
@@ -156,27 +191,25 @@ public class ExecutorCompletionServiceTe
         final AtomicBoolean done = new AtomicBoolean(false);
         class MyCallableFuture<V> extends FutureTask<V> {
             MyCallableFuture(Callable<V> c) { super(c); }
-            protected void done() { done.set(true); }
+            @Override 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());
+        final 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);
+                }};
+        CompletionService<String> cs = new ExecutorCompletionService<>(e);
+        try (PoolCleaner cleaner = cleaner(e)) {
+            assertNull(cs.poll());
             Callable<String> c = new StringTask();
-            Future f1 = ecs.submit(c);
+            Future<?> f1 = cs.submit(c);
             assertTrue("submit must return MyCallableFuture",
                        f1 instanceof MyCallableFuture);
-            Future f2 = ecs.take();
+            Future<?> f2 = cs.take();
             assertSame("submit and take must return same objects", f1, f2);
             assertTrue("completed task must have set done", done.get());
-        } finally {
-            joinPool(e);
         }
     }
 
@@ -188,27 +221,25 @@ public class ExecutorCompletionServiceTe
         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); }
+            @Override 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());
+        final 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);
+                }};
+        CompletionService<String> cs = new ExecutorCompletionService<>(e);
+        try (PoolCleaner cleaner = cleaner(e)) {
+            assertNull(cs.poll());
             Runnable r = new NoOpRunnable();
-            Future f1 = ecs.submit(r, null);
+            Future<?> f1 = cs.submit(r, null);
             assertTrue("submit must return MyRunnableFuture",
                        f1 instanceof MyRunnableFuture);
-            Future f2 = ecs.take();
+            Future<?> f2 = cs.take();
             assertSame("submit and take must return same objects", f1, f2);
             assertTrue("completed task must have set done", done.get());
-        } finally {
-            joinPool(e);
         }
     }