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 |
} |