test/tck/SynchronousQueueTest.java

/*
 * Written by members of JCP JSR-166 Expert Group and released to the
 * public domain. Use, modify, and redistribute this code in any way
 * without acknowledgement. Other contributors include Andrew Wright,
 * Jeffrey Hayes, Pat Fischer, Mike Judd.
 */

import junit.framework.*;
import java.util.*;
import java.util.concurrent.*;
import java.io.*;

public class SynchronousQueueTest extends TestCase {

    private final static int N = 1;
    private static long SHORT_DELAY_MS = 100; 
    private static long MEDIUM_DELAY_MS = 1000;
    private static long LONG_DELAY_MS = 10000; 

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

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

    public void testEmptyFull() {
        SynchronousQueue q = new SynchronousQueue();
        assertTrue(q.isEmpty());
        assertEquals(0, q.size());
        assertEquals(0, q.remainingCapacity());
        assertFalse(q.offer(new Integer(3)));
    }

    public void testOfferNull(){
        try {
            SynchronousQueue q = new SynchronousQueue();
            q.offer(null);
            fail("should throw NPE");
        } catch (NullPointerException success) { }   
    }

    public void testOffer(){
        SynchronousQueue q = new SynchronousQueue();
        assertFalse(q.offer(new Integer(1)));
    }

    public void testAdd(){
        try {
            SynchronousQueue q = new SynchronousQueue();
            assertEquals(0, q.remainingCapacity());
            q.add(new Integer(0));
        } catch (IllegalStateException success){
        }   
    }

    public void testAddAll1(){
        try {
            SynchronousQueue q = new SynchronousQueue();
            q.addAll(null);
            fail("Cannot add null collection");
        }
        catch (NullPointerException success) {}
    }
    public void testAddAll2(){
        try {
            SynchronousQueue q = new SynchronousQueue();
            Integer[] ints = new Integer[N];
            q.addAll(Arrays.asList(ints));
            fail("Cannot add null elements");
        }
        catch (NullPointerException success) {}
    }
    public void testAddAll4(){
        try {
            SynchronousQueue q = new SynchronousQueue();
            Integer[] ints = new Integer[N];
            for (int i = 0; i < N; ++i)
                ints[i] = new Integer(i);
            q.addAll(Arrays.asList(ints));
            fail("Cannot add with insufficient capacity");
        }
        catch (IllegalStateException success) {}
    }

    public void testPutNull() {
        try {
            SynchronousQueue q = new SynchronousQueue();
            q.put(null);
            fail("put should throw NPE");
        } 
        catch (NullPointerException success){
        }   
        catch (InterruptedException ie) {
            fail("Unexpected exception");
        }
     }

    public void testBlockingPut(){
        Thread t = new Thread(new Runnable() {
                public void run() {
                    try {
                        SynchronousQueue q = new SynchronousQueue();
                        q.put(new Integer(0));
                        fail("put should block");
                    } catch (InterruptedException ie){
                    }   
                }});
        t.start();
        try { 
           Thread.sleep(SHORT_DELAY_MS); 
           t.interrupt();
           t.join();
        }
        catch (InterruptedException ie) {
            fail("Unexpected exception");
        }
    }

    public void testPutWithTake() {
        final SynchronousQueue q = new SynchronousQueue();
        Thread t = new Thread(new Runnable() {
                public void run(){
                    int added = 0;
                    try {
                        q.put(new Object());
                        ++added;
                        q.put(new Object());
                        ++added;
                        q.put(new Object());
                        ++added;
                        q.put(new Object());
                        ++added;
                        fail("Should block");
                    } catch (InterruptedException e){
                        assertTrue(added >= 1);
                    }
                }
            });
        try {
            t.start();
            Thread.sleep(SHORT_DELAY_MS);
            q.take();
            Thread.sleep(SHORT_DELAY_MS);
            t.interrupt();
            t.join();
        } catch (Exception e){
            fail("Unexpected exception");
        }
    }

    public void testTimedOffer() {
        final SynchronousQueue q = new SynchronousQueue();
        Thread t = new Thread(new Runnable() {
                public void run(){
                    try {

                        assertFalse(q.offer(new Object(), SHORT_DELAY_MS/2, TimeUnit.MILLISECONDS));
                        q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
                        fail("Should block");
                    } catch (InterruptedException success){}
                }
            });
        
        try {
            t.start();
            Thread.sleep(SHORT_DELAY_MS);
            t.interrupt();
            t.join();
        } catch (Exception e){
            fail("Unexpected exception");
        }
    }


    public void testTakeFromEmpty() {
        final SynchronousQueue q = new SynchronousQueue();
        Thread t = new Thread(new Runnable() {
                public void run(){
                    try {
                        q.take();
                        fail("Should block");
                    } catch (InterruptedException success){ }                
                }
            });
        try {
            t.start();
            Thread.sleep(SHORT_DELAY_MS);
            t.interrupt();
            t.join();
        } catch (Exception e){
            fail("Unexpected exception");
        }
    }

    public void testPoll(){
        SynchronousQueue q = new SynchronousQueue();
        assertNull(q.poll());
    }

    public void testTimedPoll0() {
        try {
            SynchronousQueue q = new SynchronousQueue();
            assertNull(q.poll(0, TimeUnit.MILLISECONDS));
        } catch (InterruptedException e){
            fail("Unexpected exception");
        }   
    }

    public void testTimedPoll() {
        try {
            SynchronousQueue q = new SynchronousQueue();
            assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
        } catch (InterruptedException e){
            fail("Unexpected exception");
        }   
    }

    public void testInterruptedTimedPoll(){
        Thread t = new Thread(new Runnable() {
                public void run() {
                    try {
                        SynchronousQueue q = new SynchronousQueue();
                        assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
                    } catch (InterruptedException success){
                    }   
                }});
        t.start();
        try { 
           Thread.sleep(SHORT_DELAY_MS); 
           t.interrupt();
           t.join();
        }
        catch (InterruptedException ie) {
            fail("Unexpected exception");
        }
    }

    public void testTimedPollWithOffer(){
        final SynchronousQueue q = new SynchronousQueue();
        Thread t = new Thread(new Runnable() {
                public void run(){
                    try {
                        assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
                        q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
                        q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
                        fail("Should block");
                    } catch (InterruptedException success) { }                
                }
            });
        try {
            t.start();
            Thread.sleep(SHORT_DELAY_MS * 2);
            assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
            t.interrupt();
            t.join();
        } catch (Exception e){
            fail("Unexpected exception");
        }
    }  


    public void testPeek(){
        SynchronousQueue q = new SynchronousQueue();
        assertNull(q.peek());
    }

    public void testElement(){
        SynchronousQueue q = new SynchronousQueue();
        try {
            q.element();
            fail("no such element");
        }
        catch (NoSuchElementException success) {}
    }

    public void testRemove(){
        SynchronousQueue q = new SynchronousQueue();
        try {
            q.remove();
            fail("remove should throw");
        } catch (NoSuchElementException success){
        }   
    }

    public void testRemoveElement(){
        SynchronousQueue q = new SynchronousQueue();
        for (int i = 1; i < N; i+=2) {
            assertFalse(q.remove(new Integer(i)));
        }
        assertTrue(q.isEmpty());
    }
        
    public void testContains(){
        SynchronousQueue q = new SynchronousQueue();
        for (int i = 0; i < N; ++i) {
            assertFalse(q.contains(new Integer(i)));
        }
    }

    public void testClear(){
        SynchronousQueue q = new SynchronousQueue();
        q.clear();
        assertTrue(q.isEmpty());
    }

    public void testContainsAll(){
        SynchronousQueue q = new SynchronousQueue();
        Integer[] empty = new Integer[0];
        Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
        //        assertTrue(q.containsAll(Arrays.asList(empty)));
        assertFalse(q.containsAll(Arrays.asList(ints)));
    }

    public void testRetainAll(){
        SynchronousQueue q = new SynchronousQueue();
        Integer[] empty = new Integer[0];
        Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
        q.retainAll(Arrays.asList(ints));
        //        assertTrue(q.containsAll(Arrays.asList(empty)));
        assertFalse(q.containsAll(Arrays.asList(ints)));
    }

    public void testRemoveAll(){
        SynchronousQueue q = new SynchronousQueue();
        Integer[] empty = new Integer[0];
        Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
        q.removeAll(Arrays.asList(ints));
        //        assertTrue(q.containsAll(Arrays.asList(empty)));
        assertFalse(q.containsAll(Arrays.asList(ints)));
    }


    public void testToArray(){
        SynchronousQueue q = new SynchronousQueue();
        Object[] o = q.toArray();
        assertEquals(o.length, 0);
    }

    public void testToArray2(){
        SynchronousQueue q = new SynchronousQueue();
        Integer[] ints = new Integer[1];
        assertNull(ints[0]);
    }
    
    public void testIterator(){
        SynchronousQueue q = new SynchronousQueue();
        Iterator it = q.iterator();
        assertFalse(it.hasNext());
        try {
            Object x = it.next();
            fail("should throw");
        }
        catch (NoSuchElementException success) {}
    }

    public void testIteratorRemove(){
        SynchronousQueue q = new SynchronousQueue();
        Iterator it = q.iterator();
        try {
            it.remove();
            fail("should throw");
        }
        catch (IllegalStateException success) {}
    }

    public void testToString(){
        SynchronousQueue q = new SynchronousQueue();
        String s = q.toString();
        assertTrue(s != null);
    }        


    public void testOfferInExecutor() {
        final SynchronousQueue q = new SynchronousQueue();
        ExecutorService executor = Executors.newFixedThreadPool(2);
        final Integer one = new Integer(1);

        executor.execute(new Runnable() {
            public void run() {
                assertFalse(q.offer(one));
                try {
                    assertTrue(q.offer(one, MEDIUM_DELAY_MS * 2, TimeUnit.MILLISECONDS));
                    assertEquals(0, q.remainingCapacity());
                }
                catch (InterruptedException e) {
                    fail("should not be interrupted");
                }
            }
        });

        executor.execute(new Runnable() {
            public void run() {
                try {
                    Thread.sleep(MEDIUM_DELAY_MS);
                    assertEquals(one, q.take());
                }
                catch (InterruptedException e) {
                    fail("should not be interrupted");
                }
            }
        });
        
        executor.shutdown();

    }

    public void testPollInExecutor() {

        final SynchronousQueue q = new SynchronousQueue();

        ExecutorService executor = Executors.newFixedThreadPool(2);

        executor.execute(new Runnable() {
            public void run() {
                assertNull(q.poll());
                try {
                    assertTrue(null != q.poll(MEDIUM_DELAY_MS * 2, TimeUnit.MILLISECONDS));
                    assertTrue(q.isEmpty());
                }
                catch (InterruptedException e) {
                    fail("should not be interrupted");
                }
            }
        });

        executor.execute(new Runnable() {
            public void run() {
                try {
                    Thread.sleep(MEDIUM_DELAY_MS);
                    q.put(new Integer(1));
                }
                catch (InterruptedException e) {
                    fail("should not be interrupted");
                }
            }
        });
        
        executor.shutdown();

    }

    public void testSerialization() {
        SynchronousQueue q = new SynchronousQueue();
        try {
            ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
            ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
            out.writeObject(q);
            out.close();

            ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
            ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
            SynchronousQueue r = (SynchronousQueue)in.readObject();
            assertEquals(q.size(), r.size());
            while (!q.isEmpty()) 
                assertEquals(q.remove(), r.remove());
        } catch(Exception e){
            fail("unexpected exception");
        }
    }

}
Revision:	1.2
Committed:	Sun Sep 7 20:39:11 2003 UTC (20 years, 8 months ago) by dl
Branch:	MAIN
Changes since 1.1:	+21 -1 lines
Log Message:	Added serialization and lock tests
#	Content
1	/*
2	* Written by members of JCP JSR-166 Expert Group and released to the
3	* public domain. Use, modify, and redistribute this code in any way
4	* without acknowledgement. Other contributors include Andrew Wright,
5	* Jeffrey Hayes, Pat Fischer, Mike Judd.
6	*/
7
8	import junit.framework.*;
9	import java.util.*;
10	import java.util.concurrent.*;
11	import java.io.*;
12
13	public class SynchronousQueueTest extends TestCase {
14
15	private final static int N = 1;
16	private static long SHORT_DELAY_MS = 100;
17	private static long MEDIUM_DELAY_MS = 1000;
18	private static long LONG_DELAY_MS = 10000;
19
20	public static void main(String[] args) {
21	junit.textui.TestRunner.run (suite());
22	}
23
24	public static Test suite() {
25	return new TestSuite(SynchronousQueueTest.class);
26	}
27
28	public void testEmptyFull() {
29	SynchronousQueue q = new SynchronousQueue();
30	assertTrue(q.isEmpty());
31	assertEquals(0, q.size());
32	assertEquals(0, q.remainingCapacity());
33	assertFalse(q.offer(new Integer(3)));
34	}
35
36	public void testOfferNull(){
37	try {
38	SynchronousQueue q = new SynchronousQueue();
39	q.offer(null);
40	fail("should throw NPE");
41	} catch (NullPointerException success) { }
42	}
43
44	public void testOffer(){
45	SynchronousQueue q = new SynchronousQueue();
46	assertFalse(q.offer(new Integer(1)));
47	}
48
49	public void testAdd(){
50	try {
51	SynchronousQueue q = new SynchronousQueue();
52	assertEquals(0, q.remainingCapacity());
53	q.add(new Integer(0));
54	} catch (IllegalStateException success){
55	}
56	}
57
58	public void testAddAll1(){
59	try {
60	SynchronousQueue q = new SynchronousQueue();
61	q.addAll(null);
62	fail("Cannot add null collection");
63	}
64	catch (NullPointerException success) {}
65	}
66	public void testAddAll2(){
67	try {
68	SynchronousQueue q = new SynchronousQueue();
69	Integer[] ints = new Integer[N];
70	q.addAll(Arrays.asList(ints));
71	fail("Cannot add null elements");
72	}
73	catch (NullPointerException success) {}
74	}
75	public void testAddAll4(){
76	try {
77	SynchronousQueue q = new SynchronousQueue();
78	Integer[] ints = new Integer[N];
79	for (int i = 0; i < N; ++i)
80	ints[i] = new Integer(i);
81	q.addAll(Arrays.asList(ints));
82	fail("Cannot add with insufficient capacity");
83	}
84	catch (IllegalStateException success) {}
85	}
86
87	public void testPutNull() {
88	try {
89	SynchronousQueue q = new SynchronousQueue();
90	q.put(null);
91	fail("put should throw NPE");
92	}
93	catch (NullPointerException success){
94	}
95	catch (InterruptedException ie) {
96	fail("Unexpected exception");
97	}
98	}
99
100	public void testBlockingPut(){
101	Thread t = new Thread(new Runnable() {
102	public void run() {
103	try {
104	SynchronousQueue q = new SynchronousQueue();
105	q.put(new Integer(0));
106	fail("put should block");
107	} catch (InterruptedException ie){
108	}
109	}});
110	t.start();
111	try {
112	Thread.sleep(SHORT_DELAY_MS);
113	t.interrupt();
114	t.join();
115	}
116	catch (InterruptedException ie) {
117	fail("Unexpected exception");
118	}
119	}
120
121	public void testPutWithTake() {
122	final SynchronousQueue q = new SynchronousQueue();
123	Thread t = new Thread(new Runnable() {
124	public void run(){
125	int added = 0;
126	try {
127	q.put(new Object());
128	++added;
129	q.put(new Object());
130	++added;
131	q.put(new Object());
132	++added;
133	q.put(new Object());
134	++added;
135	fail("Should block");
136	} catch (InterruptedException e){
137	assertTrue(added >= 1);
138	}
139	}
140	});
141	try {
142	t.start();
143	Thread.sleep(SHORT_DELAY_MS);
144	q.take();
145	Thread.sleep(SHORT_DELAY_MS);
146	t.interrupt();
147	t.join();
148	} catch (Exception e){
149	fail("Unexpected exception");
150	}
151	}
152
153	public void testTimedOffer() {
154	final SynchronousQueue q = new SynchronousQueue();
155	Thread t = new Thread(new Runnable() {
156	public void run(){
157	try {
158
159	assertFalse(q.offer(new Object(), SHORT_DELAY_MS/2, TimeUnit.MILLISECONDS));
160	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
161	fail("Should block");
162	} catch (InterruptedException success){}
163	}
164	});
165
166	try {
167	t.start();
168	Thread.sleep(SHORT_DELAY_MS);
169	t.interrupt();
170	t.join();
171	} catch (Exception e){
172	fail("Unexpected exception");
173	}
174	}
175
176
177	public void testTakeFromEmpty() {
178	final SynchronousQueue q = new SynchronousQueue();
179	Thread t = new Thread(new Runnable() {
180	public void run(){
181	try {
182	q.take();
183	fail("Should block");
184	} catch (InterruptedException success){ }
185	}
186	});
187	try {
188	t.start();
189	Thread.sleep(SHORT_DELAY_MS);
190	t.interrupt();
191	t.join();
192	} catch (Exception e){
193	fail("Unexpected exception");
194	}
195	}
196
197	public void testPoll(){
198	SynchronousQueue q = new SynchronousQueue();
199	assertNull(q.poll());
200	}
201
202	public void testTimedPoll0() {
203	try {
204	SynchronousQueue q = new SynchronousQueue();
205	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
206	} catch (InterruptedException e){
207	fail("Unexpected exception");
208	}
209	}
210
211	public void testTimedPoll() {
212	try {
213	SynchronousQueue q = new SynchronousQueue();
214	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
215	} catch (InterruptedException e){
216	fail("Unexpected exception");
217	}
218	}
219
220	public void testInterruptedTimedPoll(){
221	Thread t = new Thread(new Runnable() {
222	public void run() {
223	try {
224	SynchronousQueue q = new SynchronousQueue();
225	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
226	} catch (InterruptedException success){
227	}
228	}});
229	t.start();
230	try {
231	Thread.sleep(SHORT_DELAY_MS);
232	t.interrupt();
233	t.join();
234	}
235	catch (InterruptedException ie) {
236	fail("Unexpected exception");
237	}
238	}
239
240	public void testTimedPollWithOffer(){
241	final SynchronousQueue q = new SynchronousQueue();
242	Thread t = new Thread(new Runnable() {
243	public void run(){
244	try {
245	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
246	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
247	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
248	fail("Should block");
249	} catch (InterruptedException success) { }
250	}
251	});
252	try {
253	t.start();
254	Thread.sleep(SHORT_DELAY_MS * 2);
255	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
256	t.interrupt();
257	t.join();
258	} catch (Exception e){
259	fail("Unexpected exception");
260	}
261	}
262
263
264	public void testPeek(){
265	SynchronousQueue q = new SynchronousQueue();
266	assertNull(q.peek());
267	}
268
269	public void testElement(){
270	SynchronousQueue q = new SynchronousQueue();
271	try {
272	q.element();
273	fail("no such element");
274	}
275	catch (NoSuchElementException success) {}
276	}
277
278	public void testRemove(){
279	SynchronousQueue q = new SynchronousQueue();
280	try {
281	q.remove();
282	fail("remove should throw");
283	} catch (NoSuchElementException success){
284	}
285	}
286
287	public void testRemoveElement(){
288	SynchronousQueue q = new SynchronousQueue();
289	for (int i = 1; i < N; i+=2) {
290	assertFalse(q.remove(new Integer(i)));
291	}
292	assertTrue(q.isEmpty());
293	}
294
295	public void testContains(){
296	SynchronousQueue q = new SynchronousQueue();
297	for (int i = 0; i < N; ++i) {
298	assertFalse(q.contains(new Integer(i)));
299	}
300	}
301
302	public void testClear(){
303	SynchronousQueue q = new SynchronousQueue();
304	q.clear();
305	assertTrue(q.isEmpty());
306	}
307
308	public void testContainsAll(){
309	SynchronousQueue q = new SynchronousQueue();
310	Integer[] empty = new Integer[0];
311	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
312	// assertTrue(q.containsAll(Arrays.asList(empty)));
313	assertFalse(q.containsAll(Arrays.asList(ints)));
314	}
315
316	public void testRetainAll(){
317	SynchronousQueue q = new SynchronousQueue();
318	Integer[] empty = new Integer[0];
319	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
320	q.retainAll(Arrays.asList(ints));
321	// assertTrue(q.containsAll(Arrays.asList(empty)));
322	assertFalse(q.containsAll(Arrays.asList(ints)));
323	}
324
325	public void testRemoveAll(){
326	SynchronousQueue q = new SynchronousQueue();
327	Integer[] empty = new Integer[0];
328	Integer[] ints = new Integer[1]; ints[0] = new Integer(0);
329	q.removeAll(Arrays.asList(ints));
330	// assertTrue(q.containsAll(Arrays.asList(empty)));
331	assertFalse(q.containsAll(Arrays.asList(ints)));
332	}
333
334
335	public void testToArray(){
336	SynchronousQueue q = new SynchronousQueue();
337	Object[] o = q.toArray();
338	assertEquals(o.length, 0);
339	}
340
341	public void testToArray2(){
342	SynchronousQueue q = new SynchronousQueue();
343	Integer[] ints = new Integer[1];
344	assertNull(ints[0]);
345	}
346
347	public void testIterator(){
348	SynchronousQueue q = new SynchronousQueue();
349	Iterator it = q.iterator();
350	assertFalse(it.hasNext());
351	try {
352	Object x = it.next();
353	fail("should throw");
354	}
355	catch (NoSuchElementException success) {}
356	}
357
358	public void testIteratorRemove(){
359	SynchronousQueue q = new SynchronousQueue();
360	Iterator it = q.iterator();
361	try {
362	it.remove();
363	fail("should throw");
364	}
365	catch (IllegalStateException success) {}
366	}
367
368	public void testToString(){
369	SynchronousQueue q = new SynchronousQueue();
370	String s = q.toString();
371	assertTrue(s != null);
372	}
373
374
375	public void testOfferInExecutor() {
376	final SynchronousQueue q = new SynchronousQueue();
377	ExecutorService executor = Executors.newFixedThreadPool(2);
378	final Integer one = new Integer(1);
379
380	executor.execute(new Runnable() {
381	public void run() {
382	assertFalse(q.offer(one));
383	try {
384	assertTrue(q.offer(one, MEDIUM_DELAY_MS * 2, TimeUnit.MILLISECONDS));
385	assertEquals(0, q.remainingCapacity());
386	}
387	catch (InterruptedException e) {
388	fail("should not be interrupted");
389	}
390	}
391	});
392
393	executor.execute(new Runnable() {
394	public void run() {
395	try {
396	Thread.sleep(MEDIUM_DELAY_MS);
397	assertEquals(one, q.take());
398	}
399	catch (InterruptedException e) {
400	fail("should not be interrupted");
401	}
402	}
403	});
404
405	executor.shutdown();
406
407	}
408
409	public void testPollInExecutor() {
410
411	final SynchronousQueue q = new SynchronousQueue();
412
413	ExecutorService executor = Executors.newFixedThreadPool(2);
414
415	executor.execute(new Runnable() {
416	public void run() {
417	assertNull(q.poll());
418	try {
419	assertTrue(null != q.poll(MEDIUM_DELAY_MS * 2, TimeUnit.MILLISECONDS));
420	assertTrue(q.isEmpty());
421	}
422	catch (InterruptedException e) {
423	fail("should not be interrupted");
424	}
425	}
426	});
427
428	executor.execute(new Runnable() {
429	public void run() {
430	try {
431	Thread.sleep(MEDIUM_DELAY_MS);
432	q.put(new Integer(1));
433	}
434	catch (InterruptedException e) {
435	fail("should not be interrupted");
436	}
437	}
438	});
439
440	executor.shutdown();
441
442	}
443
444	public void testSerialization() {
445	SynchronousQueue q = new SynchronousQueue();
446	try {
447	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
448	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
449	out.writeObject(q);
450	out.close();
451
452	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
453	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
454	SynchronousQueue r = (SynchronousQueue)in.readObject();
455	assertEquals(q.size(), r.size());
456	while (!q.isEmpty())
457	assertEquals(q.remove(), r.remove());
458	} catch(Exception e){
459	fail("unexpected exception");
460	}
461	}
462
463	}