test/tck/ExecutorCompletionServiceTest.java

/*
 * 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.
 */

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 {
    public static void main(String[] args) {
        main(suite(), args);
    }
    public static Test suite() {
        return new TestSuite(ExecutorCompletionServiceTest.class);
    }

    /**
     * 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() {
        final ExecutorService e = Executors.newCachedThreadPool();
        final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try (PoolCleaner cleaner = cleaner(e)) {
            Callable c = null;
            try {
                ecs.submit(c);
                shouldThrow();
            } catch (NullPointerException success) {}
        }
    }

    /**
     * Submitting a null runnable throws NPE
     */
    public void testSubmitNPE2() {
        final ExecutorService e = Executors.newCachedThreadPool();
        final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try (PoolCleaner cleaner = cleaner(e)) {
            Runnable r = null;
            try {
                ecs.submit(r, Boolean.TRUE);
                shouldThrow();
            } catch (NullPointerException success) {}
        }
    }

    /**
     * A taken submitted task is completed
     */
    public void testTake() throws InterruptedException {
        final ExecutorService e = Executors.newCachedThreadPool();
        final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try (PoolCleaner cleaner = cleaner(e)) {
            Callable c = new StringTask();
            ecs.submit(c);
            Future f = ecs.take();
            assertTrue(f.isDone());
        }
    }

    /**
     * Take returns the same future object returned by submit
     */
    public void testTake2() throws InterruptedException {
        final ExecutorService e = Executors.newCachedThreadPool();
        final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try (PoolCleaner cleaner = cleaner(e)) {
            Callable c = new StringTask();
            Future f1 = ecs.submit(c);
            Future f2 = ecs.take();
            assertSame(f1, f2);
        }
    }

    /**
     * If poll returns non-null, the returned task is completed
     */
    public void testPoll1() throws Exception {
        final ExecutorService e = Executors.newCachedThreadPool();
        final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try (PoolCleaner cleaner = cleaner(e)) {
            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());
        }
    }

    /**
     * If timed poll returns non-null, the returned task is completed
     */
    public void testPoll2() throws InterruptedException {
        final ExecutorService e = Executors.newCachedThreadPool();
        final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
        try (PoolCleaner cleaner = cleaner(e)) {
            assertNull(ecs.poll());
            Callable c = new StringTask();
            ecs.submit(c);
            Future f = ecs.poll(SHORT_DELAY_MS, MILLISECONDS);
            if (f != null)
                assertTrue(f.isDone());
        }
    }

    /**
     * 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); }
        }
        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);
                }};
        ExecutorCompletionService<String> ecs =
            new ExecutorCompletionService<String>(e);
        try (PoolCleaner cleaner = cleaner(e)) {
            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());
        }
    }

    /**
     * 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); }
        }
        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);
                }};
        final ExecutorCompletionService<String> ecs =
            new ExecutorCompletionService<String>(e);
        try (PoolCleaner cleaner = cleaner(e)) {
            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());
        }
    }

}
Revision:	1.22
Committed:	Sun Oct 4 18:28:51 2015 UTC (8 years, 7 months ago) by jsr166
Branch:	MAIN
Changes since 1.21:	+43 -55 lines
Log Message:	PoolCleaning
#	Content
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	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10
11	import java.util.concurrent.ArrayBlockingQueue;
12	import java.util.concurrent.Callable;
13	import java.util.concurrent.ExecutorCompletionService;
14	import java.util.concurrent.Executors;
15	import java.util.concurrent.ExecutorService;
16	import java.util.concurrent.Future;
17	import java.util.concurrent.FutureTask;
18	import java.util.concurrent.RunnableFuture;
19	import java.util.concurrent.ThreadPoolExecutor;
20	import java.util.concurrent.TimeUnit;
21	import java.util.concurrent.atomic.AtomicBoolean;
22
23	import junit.framework.Test;
24	import junit.framework.TestSuite;
25
26	public class ExecutorCompletionServiceTest extends JSR166TestCase {
27	public static void main(String[] args) {
28	main(suite(), args);
29	}
30	public static Test suite() {
31	return new TestSuite(ExecutorCompletionServiceTest.class);
32	}
33
34	/**
35	* Creating a new ECS with null Executor throw NPE
36	*/
37	public void testConstructorNPE() {
38	try {
39	new ExecutorCompletionService(null);
40	shouldThrow();
41	} catch (NullPointerException success) {}
42	}
43
44	/**
45	* Creating a new ECS with null queue throw NPE
46	*/
47	public void testConstructorNPE2() {
48	try {
49	ExecutorService e = Executors.newCachedThreadPool();
50	new ExecutorCompletionService(e, null);
51	shouldThrow();
52	} catch (NullPointerException success) {}
53	}
54
55	/**
56	* Submitting a null callable throws NPE
57	*/
58	public void testSubmitNPE() {
59	final ExecutorService e = Executors.newCachedThreadPool();
60	final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
61	try (PoolCleaner cleaner = cleaner(e)) {
62	Callable c = null;
63	try {
64	ecs.submit(c);
65	shouldThrow();
66	} catch (NullPointerException success) {}
67	}
68	}
69
70	/**
71	* Submitting a null runnable throws NPE
72	*/
73	public void testSubmitNPE2() {
74	final ExecutorService e = Executors.newCachedThreadPool();
75	final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
76	try (PoolCleaner cleaner = cleaner(e)) {
77	Runnable r = null;
78	try {
79	ecs.submit(r, Boolean.TRUE);
80	shouldThrow();
81	} catch (NullPointerException success) {}
82	}
83	}
84
85	/**
86	* A taken submitted task is completed
87	*/
88	public void testTake() throws InterruptedException {
89	final ExecutorService e = Executors.newCachedThreadPool();
90	final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
91	try (PoolCleaner cleaner = cleaner(e)) {
92	Callable c = new StringTask();
93	ecs.submit(c);
94	Future f = ecs.take();
95	assertTrue(f.isDone());
96	}
97	}
98
99	/**
100	* Take returns the same future object returned by submit
101	*/
102	public void testTake2() throws InterruptedException {
103	final ExecutorService e = Executors.newCachedThreadPool();
104	final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
105	try (PoolCleaner cleaner = cleaner(e)) {
106	Callable c = new StringTask();
107	Future f1 = ecs.submit(c);
108	Future f2 = ecs.take();
109	assertSame(f1, f2);
110	}
111	}
112
113	/**
114	* If poll returns non-null, the returned task is completed
115	*/
116	public void testPoll1() throws Exception {
117	final ExecutorService e = Executors.newCachedThreadPool();
118	final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
119	try (PoolCleaner cleaner = cleaner(e)) {
120	assertNull(ecs.poll());
121	Callable c = new StringTask();
122	ecs.submit(c);
123
124	long startTime = System.nanoTime();
125	Future f;
126	while ((f = ecs.poll()) == null) {
127	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
128	fail("timed out");
129	Thread.yield();
130	}
131	assertTrue(f.isDone());
132	assertSame(TEST_STRING, f.get());
133	}
134	}
135
136	/**
137	* If timed poll returns non-null, the returned task is completed
138	*/
139	public void testPoll2() throws InterruptedException {
140	final ExecutorService e = Executors.newCachedThreadPool();
141	final ExecutorCompletionService ecs = new ExecutorCompletionService(e);
142	try (PoolCleaner cleaner = cleaner(e)) {
143	assertNull(ecs.poll());
144	Callable c = new StringTask();
145	ecs.submit(c);
146	Future f = ecs.poll(SHORT_DELAY_MS, MILLISECONDS);
147	if (f != null)
148	assertTrue(f.isDone());
149	}
150	}
151
152	/**
153	* Submitting to underlying AES that overrides newTaskFor(Callable)
154	* returns and eventually runs Future returned by newTaskFor.
155	*/
156	public void testNewTaskForCallable() throws InterruptedException {
157	final AtomicBoolean done = new AtomicBoolean(false);
158	class MyCallableFuture<V> extends FutureTask<V> {
159	MyCallableFuture(Callable<V> c) { super(c); }
160	protected void done() { done.set(true); }
161	}
162	final ExecutorService e =
163	new ThreadPoolExecutor(1, 1,
164	30L, TimeUnit.SECONDS,
165	new ArrayBlockingQueue<Runnable>(1)) {
166	protected <T> RunnableFuture<T> newTaskFor(Callable<T> c) {
167	return new MyCallableFuture<T>(c);
168	}};
169	ExecutorCompletionService<String> ecs =
170	new ExecutorCompletionService<String>(e);
171	try (PoolCleaner cleaner = cleaner(e)) {
172	assertNull(ecs.poll());
173	Callable<String> c = new StringTask();
174	Future f1 = ecs.submit(c);
175	assertTrue("submit must return MyCallableFuture",
176	f1 instanceof MyCallableFuture);
177	Future f2 = ecs.take();
178	assertSame("submit and take must return same objects", f1, f2);
179	assertTrue("completed task must have set done", done.get());
180	}
181	}
182
183	/**
184	* Submitting to underlying AES that overrides newTaskFor(Runnable,T)
185	* returns and eventually runs Future returned by newTaskFor.
186	*/
187	public void testNewTaskForRunnable() throws InterruptedException {
188	final AtomicBoolean done = new AtomicBoolean(false);
189	class MyRunnableFuture<V> extends FutureTask<V> {
190	MyRunnableFuture(Runnable t, V r) { super(t, r); }
191	protected void done() { done.set(true); }
192	}
193	final ExecutorService e =
194	new ThreadPoolExecutor(1, 1,
195	30L, TimeUnit.SECONDS,
196	new ArrayBlockingQueue<Runnable>(1)) {
197	protected <T> RunnableFuture<T> newTaskFor(Runnable t, T r) {
198	return new MyRunnableFuture<T>(t, r);
199	}};
200	final ExecutorCompletionService<String> ecs =
201	new ExecutorCompletionService<String>(e);
202	try (PoolCleaner cleaner = cleaner(e)) {
203	assertNull(ecs.poll());
204	Runnable r = new NoOpRunnable();
205	Future f1 = ecs.submit(r, null);
206	assertTrue("submit must return MyRunnableFuture",
207	f1 instanceof MyRunnableFuture);
208	Future f2 = ecs.take();
209	assertSame("submit and take must return same objects", f1, f2);
210	assertTrue("completed task must have set done", done.get());
211	}
212	}
213
214	}