test/tck/PhaserTest.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/licenses/publicdomain
 * Other contributors include John Vint
 */

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.*;
import junit.framework.Test;
import junit.framework.TestSuite;

public class PhaserTest extends JSR166TestCase {

    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }

    public static Test suite() {
        return new TestSuite(PhaserTest.class);
    }

    /**
     * Empty constructor builds a new Phaser with no parent, no registered
     * parties and initial phase number of 0
     */
    public void testConstructor1() {
        Phaser phaser = new Phaser();
        assertNull(phaser.getParent());
        assertEquals(0, phaser.getArrivedParties());
        assertEquals(0, phaser.getPhase());
    }

    /**
     * A negative party number for the constructor throws illegal argument
     * exception
     */
    public void testConstructor2() {
        try {
            new Phaser(-1);
            shouldThrow();
        } catch (IllegalArgumentException success) {
        }
    }

    /**
     * The parent being input into the constructor should equal the original
     * parent when being returned
     */
    public void testConstructor3() {
        Phaser parent = new Phaser();
        assertEquals(parent, new Phaser(parent).getParent());
    }

    /**
     * A negative party number for the constructor throws illegal argument
     * exception
     */
    public void testConstructor4() {
        try {
            new Phaser(new Phaser(), -1);
            shouldThrow();
        } catch (IllegalArgumentException success) {
        }
    }

    /**
     * The parent being input into the parameter should equal the original
     * parent when being returned
     */
    public void testConstructor5() {
        Phaser parent = new Phaser();
        assertEquals(parent, new Phaser(parent, 0).getParent());
    }

    /**
     * register() will increment the number of unarrived parties by one and not
     * affect its arrived parties
     */
    public void testRegister1() {
        Phaser phaser = new Phaser();
        assertEquals(0, phaser.getUnarrivedParties());
        phaser.register();
        assertEquals(1, phaser.getUnarrivedParties());
        assertEquals(0, phaser.getArrivedParties());
    }

    /**
     * Registering more than 65536 parties causes IllegalStateException
     */
    public void testRegister2() {
        Phaser phaser = new Phaser(0);
        int expectedUnnarivedParties = (1 << 16) - 1;
        for (int i = 0; i < expectedUnnarivedParties; i++) {
            phaser.register();
            assertEquals(i + 1, phaser.getUnarrivedParties());
        }
        try {
            phaser.register();
            shouldThrow();
        } catch (IllegalStateException success) {
        }
    }

    /**
     * register() correctly returns the current barrier phase number when
     * invoked
     */
    public void testRegister3() {
        Phaser phaser = new Phaser();
        assertEquals(0, phaser.register());
        phaser.arrive();
        assertEquals(1, phaser.register());
    }

    /**
     * register causes the next arrive to not increment the phase rather retain
     * the phase number
     */
    public void testRegister4() {
        Phaser phaser = new Phaser(1);
        phaser.arrive();
        int expectedPhase = phaser.register();
        phaser.arrive();
        assertEquals(expectedPhase, phaser.getPhase());
    }

    public void testRegister5() {
        Phaser phaser = new Phaser();
        phaser.register();
        assertEquals(1, phaser.getUnarrivedParties());
    }

    /**
     * Invoking bulkRegister with a negative parameter throws an
     * IllegalArgumentException
     */
    public void testBulkRegister1() {
        try {
            new Phaser().bulkRegister(-1);
            shouldThrow();
        } catch (IllegalArgumentException success) {
        }
    }

    /**
     * bulkRegister should correctly record the number of unarrived parties with
     * the number of parties being registered
     */
    public void testBulkRegister2() {
        Phaser phaser = new Phaser();
        phaser.bulkRegister(20);
        assertEquals(20, phaser.getUnarrivedParties());
    }

    /**
     * Registering with a number of parties greater than or equal to 1<<16
     * throws IllegalStateException.
     */
    public void testBulkRegister3() {
        try {
            new Phaser().bulkRegister(1 << 16);
            shouldThrow();
        } catch (IllegalStateException success) {
        }
    }

    /**
     * the phase number increments correctly when tripping the barrier
     */
    public void testPhaseIncrement1() {
        for (int size = 1; size < nine; size++) {
            final Phaser phaser = new Phaser(size);
            for (int index = 0; index <= (1 << size); index++) {
                int phase = phaser.arrive();
                assertTrue(index % size == 0 ? (index / size) == phase : index - (phase * size) > 0);
            }
        }
    }

    /**
     *  Arrive() on a registered phaser increments phase.
     */
    public void testArrive1() {
        Phaser phaser = new Phaser(1);
        phaser.arrive();
        assertEquals(1, phaser.getPhase());
    }

    /**
     * arriveAndDeregister does not wait for others to arrive at barrier
     */
    public void testArrive2() throws InterruptedException {
        final Phaser phaser = new Phaser(1);
        phaser.register();
        List<Thread> threads = new ArrayList<Thread>();
        for (int i = 0; i < 10; i++)
            phaser.register();
            threads.add(newStartedThread(new CheckedRunnable() {
                void realRun() throws InterruptedException {
                    Thread.sleep(SMALL_DELAY_MS);
                    phaser.arriveAndDeregister();
                }}));

        phaser.arrive();
        assertTrue(threads.get(0).isAlive());
        assertFalse(phaser.isTerminated());
        for (Thread thread : threads)
            thread.join();
    }

    /**
     * arrive() returns a negative number if the Phaser is terminated
     */
    public void testArrive3() {
        Phaser phaser = new Phaser(1);
        phaser.forceTermination();
        assertTrue(phaser.arrive() < 0);
    }

    /**
     * arriveAndDeregister() throws IllegalStateException if number of
     * registered or unarrived parties would become negative
     */
    public void testArriveAndDeregister1() {
        try {
            Phaser phaser = new Phaser();
            phaser.arriveAndDeregister();
            shouldThrow();
        } catch (IllegalStateException success) {
        }
    }

    /**
     * arriveAndDeregister deregisters reduces the number of arrived parties
     */
    public void testArriveAndDergeister2() {
        final Phaser phaser = new Phaser(1);
        phaser.register();
        phaser.arrive();
        int p = phaser.getArrivedParties();
        assertTrue(p == 1);
        phaser.arriveAndDeregister();
        assertTrue(phaser.getArrivedParties() < p);
    }

    /**
     * arriveAndDeregister arrives to the barrier on a phaser with a parent and
     * when a deregistration occurs and causes the phaser to have zero parties
     * its parent will be deregistered as well
     */
    public void testArriveAndDeregsiter3() {
        Phaser parent = new Phaser();
        Phaser root = new Phaser(parent);
        root.register();
        assertTrue(parent.getUnarrivedParties() > 0);
        assertTrue(root.getUnarrivedParties() > 0);
        root.arriveAndDeregister();
        assertTrue(parent.getUnarrivedParties() == 0);
        assertTrue(root.getUnarrivedParties() == 0);
        assertTrue(root.isTerminated() && parent.isTerminated());
    }

    /**
     * arriveAndDeregister deregisters one party from its parent when
     * the number of parties of root is zero after deregistration
     */
    public void testArriveAndDeregsiter4() {
        Phaser parent = new Phaser();
        Phaser root = new Phaser(parent);
        parent.register();
        root.register();
        int parentParties = parent.getUnarrivedParties();
        root.arriveAndDeregister();
        assertEquals(parentParties - 1, parent.getUnarrivedParties());
    }

    /**
     * arriveAndDeregister deregisters one party from its parent when
     * the number of parties of root is nonzero after deregistration.
     */
    public void testArriveAndDeregister5() {
        Phaser parent = new Phaser();
        Phaser child = new Phaser(parent);
        Phaser root = new Phaser(child);
        assertTrue(parent.getUnarrivedParties() > 0);
        assertTrue(child.getUnarrivedParties() > 0);
        root.register();
        root.arriveAndDeregister();
        assertTrue(parent.getUnarrivedParties() == 0);
        assertTrue(child.getUnarrivedParties() == 0);
        assertTrue(root.isTerminated());
    }

    /**
     * arriveAndDeregister returns the phase in which it leaves the
     * phaser in after deregistration
     */
    public void testArriveAndDeregister6() throws InterruptedException {
        final Phaser phaser = new Phaser(2);
        Thread t = newStartedThread(new CheckedRunnable() {
            void realRun() {
                sleepTillInterrupted(SHORT_DELAY_MS);
                phaser.arrive();
            }});
        phaser.arriveAndAwaitAdvance();
        int phase = phaser.arriveAndDeregister();
        assertEquals(phase, phaser.getPhase());
        t.join();
    }

    /**
     * awaitAdvance succeeds upon advance
     */
    public void testAwaitAdvance1() {
        final Phaser phaser = new Phaser(1);
        phaser.awaitAdvance(phaser.arrive());
    }

    /**
     * awaitAdvance with a negative parameter will return without affecting the
     * phaser
     */
    public void testAwaitAdvance2() {
        Phaser phaser = new Phaser();
        phaser.awaitAdvance(-1);
    }

    /**
     * awaitAdvance while waiting does not abort on interrupt.
     */
    public void testAwaitAdvance3() throws InterruptedException {
        final Phaser phaser = new Phaser();
        phaser.register();

        Thread t = newStartedThread(new CheckedRunnable() {
            void realRun() throws InterruptedException {
                phaser.register();
                sleepTillInterrupted(LONG_DELAY_MS);
                phaser.awaitAdvance(phaser.arrive());
            }});
        Thread.sleep(SMALL_DELAY_MS);
        t.interrupt();
        Thread.sleep(SMALL_DELAY_MS);
        phaser.arrive();
        assertFalse(t.isInterrupted());
        t.join();
    }

    /**
     * awaitAdvance atomically waits for all parties within the same phase to
     * complete before continuing
     */
    public void testAwaitAdvance4() throws InterruptedException {
        final Phaser phaser = new Phaser(4);
        final AtomicInteger phaseCount = new AtomicInteger(0);
        List<Thread> threads = new ArrayList<Thread>();
        for (int i = 0; i < 4; i++) {
            threads.add(newStartedThread(new CheckedRunnable() {
                void realRun() {
                    int phase = phaser.arrive();
                    phaseCount.incrementAndGet();
                    sleepTillInterrupted(SMALL_DELAY_MS);
                    phaser.awaitAdvance(phase);
                    threadAssertTrue(phaseCount.get() == 4);
                }}));
        }
        for (Thread thread : threads)
            thread.join();
    }

    /**
     * awaitAdvance returns the current phase
     */
    public void testAwaitAdvance5() throws InterruptedException {
        final Phaser phaser = new Phaser(1);
        int phase = phaser.awaitAdvance(phaser.arrive());
        assertEquals(phase, phaser.getPhase());
        phaser.register();
        List<Thread> threads = new ArrayList<Thread>();
        for (int i = 0; i < 8; i++) {
            threads.add(newStartedThread(new CheckedRunnable() {
                void realRun() {
                    sleepTillInterrupted(SHORT_DELAY_MS);
                    phaser.arrive();
                }}));
            phase = phaser.awaitAdvance(phaser.arrive());
            threadAssertEquals(phase, phaser.getPhase());
        }
        for (Thread thread : threads)
            thread.join();
    }

    /**
     * awaitAdvance returns when the phaser is externally terminated
     */
    public void testAwaitAdvance6() throws InterruptedException {
        final Phaser phaser = new Phaser(3);
        /*
         * Start new thread. This thread waits a small amount of time
         * and waits for the other two parties to arrive.  The party
         * in the main thread arrives quickly so at best this thread
         * waits for the second thread's party to arrive
         */
        Thread t1 = newStartedThread(new CheckedRunnable() {
            void realRun() {
                sleepTillInterrupted(SMALL_DELAY_MS);
                int phase = phaser.awaitAdvance(phaser.arrive());
                /*
                 * This point is reached when force termination is called in which phase = -1
                 */
                threadAssertTrue(phase < 0);
                threadAssertTrue(phaser.isTerminated());
            }});
        /*
         * This thread will cause the first thread run to wait, in doing so
         * the main thread will force termination in which the first thread
         * should exit peacefully as this one
         */
        Thread t2 = newStartedThread(new CheckedRunnable() {
            void realRun() {
                sleepTillInterrupted(MEDIUM_DELAY_MS);
                int p1 = phaser.arrive();
                int phase = phaser.awaitAdvance(p1);
                threadAssertTrue(phase < 0);
                threadAssertTrue(phaser.isTerminated());
            }});

        phaser.arrive();
        phaser.forceTermination();
        t1.join();
        t2.join();
    }

    /**
     * arriveAndAwaitAdvance throws IllegalStateException with no
     * unarrived parties
     */
    public void testArriveAndAwaitAdvance1() {
        try {
            Phaser phaser = new Phaser();
            phaser.arriveAndAwaitAdvance();
            shouldThrow();
        } catch (IllegalStateException success) {
        }
    }

    /**
     * Interrupted arriveAndAwaitAdvance does not throw InterruptedException
     */
    public void testArriveAndAwaitAdvance2() throws InterruptedException {
        final Phaser phaser = new Phaser(2);
        Thread th = newStartedThread(new CheckedRunnable() {
            void realRun() {
                phaser.arriveAndAwaitAdvance();
            }});

        Thread.sleep(SMALL_DELAY_MS);
        th.interrupt();
        Thread.sleep(SMALL_DELAY_MS);
        phaser.arrive();
        assertFalse(th.isInterrupted());
        th.join();
    }

    /**
     * arriveAndAwaitAdvance waits for all threads to arrive, the
     * number of arrived parties is the same number that is accounted
     * for when the main thread awaitsAdvance
     */
    public void testArriveAndAwaitAdvance3() throws InterruptedException {
        final Phaser phaser = new Phaser(1);
        final AtomicInteger arrivingCount = new AtomicInteger(0);
        final List<Thread> threads = new ArrayList<Thread>();
        for (int i = 0; i < 6; i++) {
            threads.add(newStartedThread(new CheckedRunnable() {
                void realRun() throws InterruptedException {
                    phaser.register();
                    sleepTillInterrupted(SHORT_DELAY_MS);
                    arrivingCount.getAndIncrement();
                    phaser.arrive();
                }}));
        }
        int phaseNumber = phaser.arriveAndAwaitAdvance();
        arrivingCount.incrementAndGet();
        //the + 1 adds to expectedArrive to account for the main threads arrival
        int expectedArrived = phaseNumber > 0 ? phaseNumber * six + 1 : phaser.getArrivedParties() + 1;
        threadAssertEquals(expectedArrived, arrivingCount.get());
        for (Thread thread : threads)
            thread.join();
    }

}
Revision:	1.7
Committed:	Wed Aug 5 00:48:28 2009 UTC (14 years, 9 months ago) by jsr166
Branch:	MAIN
Changes since 1.6:	+56 -70 lines
Log Message:	Ensure threads started by tests are join()ed; perf improvements
#	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/licenses/publicdomain
5	* Other contributors include John Vint
6	*/
7
8	import java.util.ArrayList;
9	import java.util.List;
10	import java.util.concurrent.atomic.AtomicInteger;
11	import java.util.concurrent.*;
12	import junit.framework.Test;
13	import junit.framework.TestSuite;
14
15	public class PhaserTest extends JSR166TestCase {
16
17	public static void main(String[] args) {
18	junit.textui.TestRunner.run(suite());
19	}
20
21	public static Test suite() {
22	return new TestSuite(PhaserTest.class);
23	}
24
25	/**
26	* Empty constructor builds a new Phaser with no parent, no registered
27	* parties and initial phase number of 0
28	*/
29	public void testConstructor1() {
30	Phaser phaser = new Phaser();
31	assertNull(phaser.getParent());
32	assertEquals(0, phaser.getArrivedParties());
33	assertEquals(0, phaser.getPhase());
34	}
35
36	/**
37	* A negative party number for the constructor throws illegal argument
38	* exception
39	*/
40	public void testConstructor2() {
41	try {
42	new Phaser(-1);
43	shouldThrow();
44	} catch (IllegalArgumentException success) {
45	}
46	}
47
48	/**
49	* The parent being input into the constructor should equal the original
50	* parent when being returned
51	*/
52	public void testConstructor3() {
53	Phaser parent = new Phaser();
54	assertEquals(parent, new Phaser(parent).getParent());
55	}
56
57	/**
58	* A negative party number for the constructor throws illegal argument
59	* exception
60	*/
61	public void testConstructor4() {
62	try {
63	new Phaser(new Phaser(), -1);
64	shouldThrow();
65	} catch (IllegalArgumentException success) {
66	}
67	}
68
69	/**
70	* The parent being input into the parameter should equal the original
71	* parent when being returned
72	*/
73	public void testConstructor5() {
74	Phaser parent = new Phaser();
75	assertEquals(parent, new Phaser(parent, 0).getParent());
76	}
77
78	/**
79	* register() will increment the number of unarrived parties by one and not
80	* affect its arrived parties
81	*/
82	public void testRegister1() {
83	Phaser phaser = new Phaser();
84	assertEquals(0, phaser.getUnarrivedParties());
85	phaser.register();
86	assertEquals(1, phaser.getUnarrivedParties());
87	assertEquals(0, phaser.getArrivedParties());
88	}
89
90	/**
91	* Registering more than 65536 parties causes IllegalStateException
92	*/
93	public void testRegister2() {
94	Phaser phaser = new Phaser(0);
95	int expectedUnnarivedParties = (1 << 16) - 1;
96	for (int i = 0; i < expectedUnnarivedParties; i++) {
97	phaser.register();
98	assertEquals(i + 1, phaser.getUnarrivedParties());
99	}
100	try {
101	phaser.register();
102	shouldThrow();
103	} catch (IllegalStateException success) {
104	}
105	}
106
107	/**
108	* register() correctly returns the current barrier phase number when
109	* invoked
110	*/
111	public void testRegister3() {
112	Phaser phaser = new Phaser();
113	assertEquals(0, phaser.register());
114	phaser.arrive();
115	assertEquals(1, phaser.register());
116	}
117
118	/**
119	* register causes the next arrive to not increment the phase rather retain
120	* the phase number
121	*/
122	public void testRegister4() {
123	Phaser phaser = new Phaser(1);
124	phaser.arrive();
125	int expectedPhase = phaser.register();
126	phaser.arrive();
127	assertEquals(expectedPhase, phaser.getPhase());
128	}
129
130	public void testRegister5() {
131	Phaser phaser = new Phaser();
132	phaser.register();
133	assertEquals(1, phaser.getUnarrivedParties());
134	}
135
136	/**
137	* Invoking bulkRegister with a negative parameter throws an
138	* IllegalArgumentException
139	*/
140	public void testBulkRegister1() {
141	try {
142	new Phaser().bulkRegister(-1);
143	shouldThrow();
144	} catch (IllegalArgumentException success) {
145	}
146	}
147
148	/**
149	* bulkRegister should correctly record the number of unarrived parties with
150	* the number of parties being registered
151	*/
152	public void testBulkRegister2() {
153	Phaser phaser = new Phaser();
154	phaser.bulkRegister(20);
155	assertEquals(20, phaser.getUnarrivedParties());
156	}
157
158	/**
159	* Registering with a number of parties greater than or equal to 1<<16
160	* throws IllegalStateException.
161	*/
162	public void testBulkRegister3() {
163	try {
164	new Phaser().bulkRegister(1 << 16);
165	shouldThrow();
166	} catch (IllegalStateException success) {
167	}
168	}
169
170	/**
171	* the phase number increments correctly when tripping the barrier
172	*/
173	public void testPhaseIncrement1() {
174	for (int size = 1; size < nine; size++) {
175	final Phaser phaser = new Phaser(size);
176	for (int index = 0; index <= (1 << size); index++) {
177	int phase = phaser.arrive();
178	assertTrue(index % size == 0 ? (index / size) == phase : index - (phase * size) > 0);
179	}
180	}
181	}
182
183	/**
184	* Arrive() on a registered phaser increments phase.
185	*/
186	public void testArrive1() {
187	Phaser phaser = new Phaser(1);
188	phaser.arrive();
189	assertEquals(1, phaser.getPhase());
190	}
191
192	/**
193	* arriveAndDeregister does not wait for others to arrive at barrier
194	*/
195	public void testArrive2() throws InterruptedException {
196	final Phaser phaser = new Phaser(1);
197	phaser.register();
198	List<Thread> threads = new ArrayList<Thread>();
199	for (int i = 0; i < 10; i++)
200	phaser.register();
201	threads.add(newStartedThread(new CheckedRunnable() {
202	void realRun() throws InterruptedException {
203	Thread.sleep(SMALL_DELAY_MS);
204	phaser.arriveAndDeregister();
205	}}));
206
207	phaser.arrive();
208	assertTrue(threads.get(0).isAlive());
209	assertFalse(phaser.isTerminated());
210	for (Thread thread : threads)
211	thread.join();
212	}
213
214	/**
215	* arrive() returns a negative number if the Phaser is terminated
216	*/
217	public void testArrive3() {
218	Phaser phaser = new Phaser(1);
219	phaser.forceTermination();
220	assertTrue(phaser.arrive() < 0);
221	}
222
223	/**
224	* arriveAndDeregister() throws IllegalStateException if number of
225	* registered or unarrived parties would become negative
226	*/
227	public void testArriveAndDeregister1() {
228	try {
229	Phaser phaser = new Phaser();
230	phaser.arriveAndDeregister();
231	shouldThrow();
232	} catch (IllegalStateException success) {
233	}
234	}
235
236	/**
237	* arriveAndDeregister deregisters reduces the number of arrived parties
238	*/
239	public void testArriveAndDergeister2() {
240	final Phaser phaser = new Phaser(1);
241	phaser.register();
242	phaser.arrive();
243	int p = phaser.getArrivedParties();
244	assertTrue(p == 1);
245	phaser.arriveAndDeregister();
246	assertTrue(phaser.getArrivedParties() < p);
247	}
248
249	/**
250	* arriveAndDeregister arrives to the barrier on a phaser with a parent and
251	* when a deregistration occurs and causes the phaser to have zero parties
252	* its parent will be deregistered as well
253	*/
254	public void testArriveAndDeregsiter3() {
255	Phaser parent = new Phaser();
256	Phaser root = new Phaser(parent);
257	root.register();
258	assertTrue(parent.getUnarrivedParties() > 0);
259	assertTrue(root.getUnarrivedParties() > 0);
260	root.arriveAndDeregister();
261	assertTrue(parent.getUnarrivedParties() == 0);
262	assertTrue(root.getUnarrivedParties() == 0);
263	assertTrue(root.isTerminated() && parent.isTerminated());
264	}
265
266	/**
267	* arriveAndDeregister deregisters one party from its parent when
268	* the number of parties of root is zero after deregistration
269	*/
270	public void testArriveAndDeregsiter4() {
271	Phaser parent = new Phaser();
272	Phaser root = new Phaser(parent);
273	parent.register();
274	root.register();
275	int parentParties = parent.getUnarrivedParties();
276	root.arriveAndDeregister();
277	assertEquals(parentParties - 1, parent.getUnarrivedParties());
278	}
279
280	/**
281	* arriveAndDeregister deregisters one party from its parent when
282	* the number of parties of root is nonzero after deregistration.
283	*/
284	public void testArriveAndDeregister5() {
285	Phaser parent = new Phaser();
286	Phaser child = new Phaser(parent);
287	Phaser root = new Phaser(child);
288	assertTrue(parent.getUnarrivedParties() > 0);
289	assertTrue(child.getUnarrivedParties() > 0);
290	root.register();
291	root.arriveAndDeregister();
292	assertTrue(parent.getUnarrivedParties() == 0);
293	assertTrue(child.getUnarrivedParties() == 0);
294	assertTrue(root.isTerminated());
295	}
296
297	/**
298	* arriveAndDeregister returns the phase in which it leaves the
299	* phaser in after deregistration
300	*/
301	public void testArriveAndDeregister6() throws InterruptedException {
302	final Phaser phaser = new Phaser(2);
303	Thread t = newStartedThread(new CheckedRunnable() {
304	void realRun() {
305	sleepTillInterrupted(SHORT_DELAY_MS);
306	phaser.arrive();
307	}});
308	phaser.arriveAndAwaitAdvance();
309	int phase = phaser.arriveAndDeregister();
310	assertEquals(phase, phaser.getPhase());
311	t.join();
312	}
313
314	/**
315	* awaitAdvance succeeds upon advance
316	*/
317	public void testAwaitAdvance1() {
318	final Phaser phaser = new Phaser(1);
319	phaser.awaitAdvance(phaser.arrive());
320	}
321
322	/**
323	* awaitAdvance with a negative parameter will return without affecting the
324	* phaser
325	*/
326	public void testAwaitAdvance2() {
327	Phaser phaser = new Phaser();
328	phaser.awaitAdvance(-1);
329	}
330
331	/**
332	* awaitAdvance while waiting does not abort on interrupt.
333	*/
334	public void testAwaitAdvance3() throws InterruptedException {
335	final Phaser phaser = new Phaser();
336	phaser.register();
337
338	Thread t = newStartedThread(new CheckedRunnable() {
339	void realRun() throws InterruptedException {
340	phaser.register();
341	sleepTillInterrupted(LONG_DELAY_MS);
342	phaser.awaitAdvance(phaser.arrive());
343	}});
344	Thread.sleep(SMALL_DELAY_MS);
345	t.interrupt();
346	Thread.sleep(SMALL_DELAY_MS);
347	phaser.arrive();
348	assertFalse(t.isInterrupted());
349	t.join();
350	}
351
352	/**
353	* awaitAdvance atomically waits for all parties within the same phase to
354	* complete before continuing
355	*/
356	public void testAwaitAdvance4() throws InterruptedException {
357	final Phaser phaser = new Phaser(4);
358	final AtomicInteger phaseCount = new AtomicInteger(0);
359	List<Thread> threads = new ArrayList<Thread>();
360	for (int i = 0; i < 4; i++) {
361	threads.add(newStartedThread(new CheckedRunnable() {
362	void realRun() {
363	int phase = phaser.arrive();
364	phaseCount.incrementAndGet();
365	sleepTillInterrupted(SMALL_DELAY_MS);
366	phaser.awaitAdvance(phase);
367	threadAssertTrue(phaseCount.get() == 4);
368	}}));
369	}
370	for (Thread thread : threads)
371	thread.join();
372	}
373
374	/**
375	* awaitAdvance returns the current phase
376	*/
377	public void testAwaitAdvance5() throws InterruptedException {
378	final Phaser phaser = new Phaser(1);
379	int phase = phaser.awaitAdvance(phaser.arrive());
380	assertEquals(phase, phaser.getPhase());
381	phaser.register();
382	List<Thread> threads = new ArrayList<Thread>();
383	for (int i = 0; i < 8; i++) {
384	threads.add(newStartedThread(new CheckedRunnable() {
385	void realRun() {
386	sleepTillInterrupted(SHORT_DELAY_MS);
387	phaser.arrive();
388	}}));
389	phase = phaser.awaitAdvance(phaser.arrive());
390	threadAssertEquals(phase, phaser.getPhase());
391	}
392	for (Thread thread : threads)
393	thread.join();
394	}
395
396	/**
397	* awaitAdvance returns when the phaser is externally terminated
398	*/
399	public void testAwaitAdvance6() throws InterruptedException {
400	final Phaser phaser = new Phaser(3);
401	/*
402	* Start new thread. This thread waits a small amount of time
403	* and waits for the other two parties to arrive. The party
404	* in the main thread arrives quickly so at best this thread
405	* waits for the second thread's party to arrive
406	*/
407	Thread t1 = newStartedThread(new CheckedRunnable() {
408	void realRun() {
409	sleepTillInterrupted(SMALL_DELAY_MS);
410	int phase = phaser.awaitAdvance(phaser.arrive());
411	/*
412	* This point is reached when force termination is called in which phase = -1
413	*/
414	threadAssertTrue(phase < 0);
415	threadAssertTrue(phaser.isTerminated());
416	}});
417	/*
418	* This thread will cause the first thread run to wait, in doing so
419	* the main thread will force termination in which the first thread
420	* should exit peacefully as this one
421	*/
422	Thread t2 = newStartedThread(new CheckedRunnable() {
423	void realRun() {
424	sleepTillInterrupted(MEDIUM_DELAY_MS);
425	int p1 = phaser.arrive();
426	int phase = phaser.awaitAdvance(p1);
427	threadAssertTrue(phase < 0);
428	threadAssertTrue(phaser.isTerminated());
429	}});
430
431	phaser.arrive();
432	phaser.forceTermination();
433	t1.join();
434	t2.join();
435	}
436
437	/**
438	* arriveAndAwaitAdvance throws IllegalStateException with no
439	* unarrived parties
440	*/
441	public void testArriveAndAwaitAdvance1() {
442	try {
443	Phaser phaser = new Phaser();
444	phaser.arriveAndAwaitAdvance();
445	shouldThrow();
446	} catch (IllegalStateException success) {
447	}
448	}
449
450	/**
451	* Interrupted arriveAndAwaitAdvance does not throw InterruptedException
452	*/
453	public void testArriveAndAwaitAdvance2() throws InterruptedException {
454	final Phaser phaser = new Phaser(2);
455	Thread th = newStartedThread(new CheckedRunnable() {
456	void realRun() {
457	phaser.arriveAndAwaitAdvance();
458	}});
459
460	Thread.sleep(SMALL_DELAY_MS);
461	th.interrupt();
462	Thread.sleep(SMALL_DELAY_MS);
463	phaser.arrive();
464	assertFalse(th.isInterrupted());
465	th.join();
466	}
467
468	/**
469	* arriveAndAwaitAdvance waits for all threads to arrive, the
470	* number of arrived parties is the same number that is accounted
471	* for when the main thread awaitsAdvance
472	*/
473	public void testArriveAndAwaitAdvance3() throws InterruptedException {
474	final Phaser phaser = new Phaser(1);
475	final AtomicInteger arrivingCount = new AtomicInteger(0);
476	final List<Thread> threads = new ArrayList<Thread>();
477	for (int i = 0; i < 6; i++) {
478	threads.add(newStartedThread(new CheckedRunnable() {
479	void realRun() throws InterruptedException {
480	phaser.register();
481	sleepTillInterrupted(SHORT_DELAY_MS);
482	arrivingCount.getAndIncrement();
483	phaser.arrive();
484	}}));
485	}
486	int phaseNumber = phaser.arriveAndAwaitAdvance();
487	arrivingCount.incrementAndGet();
488	//the + 1 adds to expectedArrive to account for the main threads arrival
489	int expectedArrived = phaseNumber > 0 ? phaseNumber * six + 1 : phaser.getArrivedParties() + 1;
490	threadAssertEquals(expectedArrived, arrivingCount.get());
491	for (Thread thread : threads)
492	thread.join();
493	}
494
495	}