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/* |
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* Written by Doug Lea and Martin Buchholz with assistance from |
3 |
* members of JCP JSR-166 Expert Group and released to the public |
4 |
* domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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|
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import java.util.concurrent.CompletableFuture; |
9 |
import java.util.concurrent.Executor; |
10 |
import java.util.concurrent.Executors; |
11 |
import java.util.concurrent.Flow; |
12 |
import java.util.concurrent.ForkJoinPool; |
13 |
import java.util.concurrent.SubmissionPublisher; |
14 |
import java.util.concurrent.atomic.AtomicInteger; |
15 |
import junit.framework.Test; |
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import junit.framework.TestSuite; |
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|
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import static java.util.concurrent.Flow.Subscriber; |
19 |
import static java.util.concurrent.Flow.Subscription; |
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
21 |
|
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public class SubmissionPublisherTest extends JSR166TestCase { |
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|
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public static void main(String[] args) { |
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main(suite(), args); |
26 |
} |
27 |
public static Test suite() { |
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return new TestSuite(SubmissionPublisherTest.class); |
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} |
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|
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final Executor basicExecutor = basicPublisher().getExecutor(); |
32 |
|
33 |
static SubmissionPublisher<Integer> basicPublisher() { |
34 |
return new SubmissionPublisher<Integer>(); |
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} |
36 |
|
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static class SPException extends RuntimeException {} |
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|
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class TestSubscriber implements Subscriber<Integer> { |
40 |
volatile Subscription sn; |
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int last; // Requires that onNexts are in numeric order |
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volatile int nexts; |
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volatile int errors; |
44 |
volatile int completes; |
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volatile boolean throwOnCall = false; |
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volatile boolean request = true; |
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volatile Throwable lastError; |
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|
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public synchronized void onSubscribe(Subscription s) { |
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threadAssertTrue(sn == null); |
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sn = s; |
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notifyAll(); |
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if (throwOnCall) |
54 |
throw new SPException(); |
55 |
if (request) |
56 |
sn.request(1L); |
57 |
} |
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public synchronized void onNext(Integer t) { |
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++nexts; |
60 |
notifyAll(); |
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int current = t.intValue(); |
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threadAssertTrue(current >= last); |
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last = current; |
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if (request) |
65 |
sn.request(1L); |
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if (throwOnCall) |
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throw new SPException(); |
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} |
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public synchronized void onError(Throwable t) { |
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threadAssertTrue(completes == 0); |
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threadAssertTrue(errors == 0); |
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lastError = t; |
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++errors; |
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notifyAll(); |
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} |
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public synchronized void onComplete() { |
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threadAssertTrue(completes == 0); |
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++completes; |
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notifyAll(); |
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} |
81 |
|
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synchronized void awaitSubscribe() { |
83 |
while (sn == null) { |
84 |
try { |
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wait(); |
86 |
} catch (Exception ex) { |
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threadUnexpectedException(ex); |
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break; |
89 |
} |
90 |
} |
91 |
} |
92 |
synchronized void awaitNext(int n) { |
93 |
while (nexts < n) { |
94 |
try { |
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wait(); |
96 |
} catch (Exception ex) { |
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threadUnexpectedException(ex); |
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break; |
99 |
} |
100 |
} |
101 |
} |
102 |
synchronized void awaitComplete() { |
103 |
while (completes == 0 && errors == 0) { |
104 |
try { |
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wait(); |
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} catch (Exception ex) { |
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threadUnexpectedException(ex); |
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break; |
109 |
} |
110 |
} |
111 |
} |
112 |
synchronized void awaitError() { |
113 |
while (errors == 0) { |
114 |
try { |
115 |
wait(); |
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} catch (Exception ex) { |
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threadUnexpectedException(ex); |
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break; |
119 |
} |
120 |
} |
121 |
} |
122 |
|
123 |
} |
124 |
|
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/** |
126 |
* A new SubmissionPublisher has no subscribers, a non-null |
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* executor, a power-of-two capacity, is not closed, and reports |
128 |
* zero demand and lag |
129 |
*/ |
130 |
void checkInitialState(SubmissionPublisher<?> p) { |
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assertFalse(p.hasSubscribers()); |
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assertEquals(0, p.getNumberOfSubscribers()); |
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assertTrue(p.getSubscribers().isEmpty()); |
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assertFalse(p.isClosed()); |
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assertNull(p.getClosedException()); |
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int n = p.getMaxBufferCapacity(); |
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assertTrue((n & (n - 1)) == 0); // power of two |
138 |
assertNotNull(p.getExecutor()); |
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assertEquals(0, p.estimateMinimumDemand()); |
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assertEquals(0, p.estimateMaximumLag()); |
141 |
} |
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|
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/** |
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* A default-constructed SubmissionPublisher has no subscribers, |
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* is not closed, has default buffer size, and uses the |
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* defaultExecutor |
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*/ |
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public void testConstructor1() { |
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SubmissionPublisher<Integer> p = new SubmissionPublisher<>(); |
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checkInitialState(p); |
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assertEquals(p.getMaxBufferCapacity(), Flow.defaultBufferSize()); |
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Executor e = p.getExecutor(), c = ForkJoinPool.commonPool(); |
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if (ForkJoinPool.getCommonPoolParallelism() > 1) |
154 |
assertSame(e, c); |
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else |
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assertNotSame(e, c); |
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} |
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|
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/** |
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* A new SubmissionPublisher has no subscribers, is not closed, |
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* has the given buffer size, and uses the given executor |
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*/ |
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public void testConstructor2() { |
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Executor e = Executors.newFixedThreadPool(1); |
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SubmissionPublisher<Integer> p = new SubmissionPublisher<>(e, 8); |
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checkInitialState(p); |
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assertSame(p.getExecutor(), e); |
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assertEquals(8, p.getMaxBufferCapacity()); |
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} |
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|
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/** |
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* A null Executor argument to SubmissionPublisher constructor |
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* throws NullPointerException |
174 |
*/ |
175 |
public void testConstructor3() { |
176 |
try { |
177 |
new SubmissionPublisher<Integer>(null, 8); |
178 |
shouldThrow(); |
179 |
} catch (NullPointerException success) {} |
180 |
} |
181 |
|
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/** |
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* A negative capacity argument to SubmissionPublisher constructor |
184 |
* throws IllegalArgumentException |
185 |
*/ |
186 |
public void testConstructor4() { |
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Executor e = Executors.newFixedThreadPool(1); |
188 |
try { |
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new SubmissionPublisher<Integer>(e, -1); |
190 |
shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
192 |
} |
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|
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/** |
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* A closed publisher reports isClosed with no closedException and |
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* throws IllegalStateException upon attempted submission; a |
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* subsequent close or closeExceptionally has no additional |
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* effect. |
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*/ |
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public void testClose() { |
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SubmissionPublisher<Integer> p = basicPublisher(); |
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checkInitialState(p); |
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p.close(); |
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assertTrue(p.isClosed()); |
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assertNull(p.getClosedException()); |
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try { |
207 |
p.submit(1); |
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shouldThrow(); |
209 |
} catch (IllegalStateException success) {} |
210 |
Throwable ex = new SPException(); |
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p.closeExceptionally(ex); |
212 |
assertTrue(p.isClosed()); |
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assertNull(p.getClosedException()); |
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} |
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|
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/** |
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* A publisher closedExceptionally reports isClosed with the |
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* closedException and throws IllegalStateException upon attempted |
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* submission; a subsequent close or closeExceptionally has no |
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* additional effect. |
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*/ |
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public void testCloseExceptionally() { |
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SubmissionPublisher<Integer> p = basicPublisher(); |
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checkInitialState(p); |
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Throwable ex = new SPException(); |
226 |
p.closeExceptionally(ex); |
227 |
assertTrue(p.isClosed()); |
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assertSame(p.getClosedException(), ex); |
229 |
try { |
230 |
p.submit(1); |
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shouldThrow(); |
232 |
} catch (IllegalStateException success) {} |
233 |
p.close(); |
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assertTrue(p.isClosed()); |
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assertSame(p.getClosedException(), ex); |
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} |
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|
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/** |
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* Upon subscription, the subscriber's onSubscribe is called, no |
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* other Subscriber methods are invoked, the publisher |
241 |
* hasSubscribers, isSubscribed is true, and existing |
242 |
* subscriptions are unaffected. |
243 |
*/ |
244 |
public void testSubscribe1() { |
245 |
TestSubscriber s = new TestSubscriber(); |
246 |
SubmissionPublisher<Integer> p = basicPublisher(); |
247 |
p.subscribe(s); |
248 |
assertTrue(p.hasSubscribers()); |
249 |
assertEquals(1, p.getNumberOfSubscribers()); |
250 |
assertTrue(p.getSubscribers().contains(s)); |
251 |
assertTrue(p.isSubscribed(s)); |
252 |
s.awaitSubscribe(); |
253 |
assertNotNull(s.sn); |
254 |
assertEquals(0, s.nexts); |
255 |
assertEquals(0, s.errors); |
256 |
assertEquals(0, s.completes); |
257 |
TestSubscriber s2 = new TestSubscriber(); |
258 |
p.subscribe(s2); |
259 |
assertTrue(p.hasSubscribers()); |
260 |
assertEquals(2, p.getNumberOfSubscribers()); |
261 |
assertTrue(p.getSubscribers().contains(s)); |
262 |
assertTrue(p.getSubscribers().contains(s2)); |
263 |
assertTrue(p.isSubscribed(s)); |
264 |
assertTrue(p.isSubscribed(s2)); |
265 |
s2.awaitSubscribe(); |
266 |
assertNotNull(s2.sn); |
267 |
assertEquals(0, s2.nexts); |
268 |
assertEquals(0, s2.errors); |
269 |
assertEquals(0, s2.completes); |
270 |
p.close(); |
271 |
} |
272 |
|
273 |
/** |
274 |
* If closed, upon subscription, the subscriber's onComplete |
275 |
* method is invoked |
276 |
*/ |
277 |
public void testSubscribe2() { |
278 |
TestSubscriber s = new TestSubscriber(); |
279 |
SubmissionPublisher<Integer> p = basicPublisher(); |
280 |
p.close(); |
281 |
p.subscribe(s); |
282 |
s.awaitComplete(); |
283 |
assertEquals(0, s.nexts); |
284 |
assertEquals(0, s.errors); |
285 |
assertEquals(1, s.completes, 1); |
286 |
} |
287 |
|
288 |
/** |
289 |
* If closedExceptionally, upon subscription, the subscriber's |
290 |
* onError method is invoked |
291 |
*/ |
292 |
public void testSubscribe3() { |
293 |
TestSubscriber s = new TestSubscriber(); |
294 |
SubmissionPublisher<Integer> p = basicPublisher(); |
295 |
Throwable ex = new SPException(); |
296 |
p.closeExceptionally(ex); |
297 |
assertTrue(p.isClosed()); |
298 |
assertSame(p.getClosedException(), ex); |
299 |
p.subscribe(s); |
300 |
s.awaitError(); |
301 |
assertEquals(0, s.nexts); |
302 |
assertEquals(1, s.errors); |
303 |
} |
304 |
|
305 |
/** |
306 |
* Upon attempted resubscription, the subscriber's onError is |
307 |
* called and the subscription is cancelled. |
308 |
*/ |
309 |
public void testSubscribe4() { |
310 |
TestSubscriber s = new TestSubscriber(); |
311 |
SubmissionPublisher<Integer> p = basicPublisher(); |
312 |
p.subscribe(s); |
313 |
assertTrue(p.hasSubscribers()); |
314 |
assertEquals(1, p.getNumberOfSubscribers()); |
315 |
assertTrue(p.getSubscribers().contains(s)); |
316 |
assertTrue(p.isSubscribed(s)); |
317 |
s.awaitSubscribe(); |
318 |
assertNotNull(s.sn); |
319 |
assertEquals(0, s.nexts); |
320 |
assertEquals(0, s.errors); |
321 |
assertEquals(0, s.completes); |
322 |
p.subscribe(s); |
323 |
s.awaitError(); |
324 |
assertEquals(0, s.nexts); |
325 |
assertEquals(1, s.errors); |
326 |
assertFalse(p.isSubscribed(s)); |
327 |
} |
328 |
|
329 |
/** |
330 |
* An exception thrown in onSubscribe causes onError |
331 |
*/ |
332 |
public void testSubscribe5() { |
333 |
TestSubscriber s = new TestSubscriber(); |
334 |
SubmissionPublisher<Integer> p = basicPublisher(); |
335 |
s.throwOnCall = true; |
336 |
try { |
337 |
p.subscribe(s); |
338 |
} catch (Exception ok) {} |
339 |
s.awaitError(); |
340 |
assertEquals(0, s.nexts); |
341 |
assertEquals(1, s.errors); |
342 |
assertEquals(0, s.completes); |
343 |
} |
344 |
|
345 |
/** |
346 |
* subscribe(null) throws NPE |
347 |
*/ |
348 |
public void testSubscribe6() { |
349 |
SubmissionPublisher<Integer> p = basicPublisher(); |
350 |
try { |
351 |
p.subscribe(null); |
352 |
shouldThrow(); |
353 |
} catch (NullPointerException success) {} |
354 |
checkInitialState(p); |
355 |
} |
356 |
|
357 |
/** |
358 |
* Closing a publisher causes onComplete to subscribers |
359 |
*/ |
360 |
public void testCloseCompletes() { |
361 |
SubmissionPublisher<Integer> p = basicPublisher(); |
362 |
TestSubscriber s1 = new TestSubscriber(); |
363 |
TestSubscriber s2 = new TestSubscriber(); |
364 |
p.subscribe(s1); |
365 |
p.subscribe(s2); |
366 |
p.submit(1); |
367 |
p.close(); |
368 |
assertTrue(p.isClosed()); |
369 |
assertNull(p.getClosedException()); |
370 |
s1.awaitComplete(); |
371 |
assertEquals(1, s1.nexts); |
372 |
assertEquals(1, s1.completes); |
373 |
s2.awaitComplete(); |
374 |
assertEquals(1, s2.nexts); |
375 |
assertEquals(1, s2.completes); |
376 |
} |
377 |
|
378 |
/** |
379 |
* Closing a publisher exceptionally causes onError to subscribers |
380 |
* after they are subscribed |
381 |
*/ |
382 |
public void testCloseExceptionallyError() { |
383 |
SubmissionPublisher<Integer> p = basicPublisher(); |
384 |
TestSubscriber s1 = new TestSubscriber(); |
385 |
TestSubscriber s2 = new TestSubscriber(); |
386 |
p.subscribe(s1); |
387 |
p.subscribe(s2); |
388 |
p.submit(1); |
389 |
p.closeExceptionally(new SPException()); |
390 |
assertTrue(p.isClosed()); |
391 |
s1.awaitSubscribe(); |
392 |
s1.awaitError(); |
393 |
assertTrue(s1.nexts <= 1); |
394 |
assertEquals(1, s1.errors); |
395 |
s2.awaitSubscribe(); |
396 |
s2.awaitError(); |
397 |
assertTrue(s2.nexts <= 1); |
398 |
assertEquals(1, s2.errors); |
399 |
} |
400 |
|
401 |
/** |
402 |
* Cancelling a subscription eventually causes no more onNexts to be issued |
403 |
*/ |
404 |
public void testCancel() { |
405 |
SubmissionPublisher<Integer> p = basicPublisher(); |
406 |
TestSubscriber s1 = new TestSubscriber(); |
407 |
TestSubscriber s2 = new TestSubscriber(); |
408 |
p.subscribe(s1); |
409 |
p.subscribe(s2); |
410 |
s1.awaitSubscribe(); |
411 |
p.submit(1); |
412 |
s1.sn.cancel(); |
413 |
for (int i = 2; i <= 20; ++i) |
414 |
p.submit(i); |
415 |
p.close(); |
416 |
s2.awaitComplete(); |
417 |
assertEquals(20, s2.nexts); |
418 |
assertEquals(1, s2.completes); |
419 |
assertTrue(s1.nexts < 20); |
420 |
assertFalse(p.isSubscribed(s1)); |
421 |
} |
422 |
|
423 |
/** |
424 |
* Throwing an exception in onNext causes onError |
425 |
*/ |
426 |
public void testThrowOnNext() { |
427 |
SubmissionPublisher<Integer> p = basicPublisher(); |
428 |
TestSubscriber s1 = new TestSubscriber(); |
429 |
TestSubscriber s2 = new TestSubscriber(); |
430 |
p.subscribe(s1); |
431 |
p.subscribe(s2); |
432 |
s1.awaitSubscribe(); |
433 |
p.submit(1); |
434 |
s1.throwOnCall = true; |
435 |
p.submit(2); |
436 |
p.close(); |
437 |
s2.awaitComplete(); |
438 |
assertEquals(2, s2.nexts); |
439 |
s1.awaitComplete(); |
440 |
assertEquals(1, s1.errors); |
441 |
} |
442 |
|
443 |
/** |
444 |
* If a handler is supplied in constructor, it is invoked when |
445 |
* subscriber throws an exception in onNext |
446 |
*/ |
447 |
public void testThrowOnNextHandler() { |
448 |
AtomicInteger calls = new AtomicInteger(); |
449 |
SubmissionPublisher<Integer> p = new SubmissionPublisher<>( |
450 |
basicExecutor, 8, (s, e) -> calls.getAndIncrement()); |
451 |
TestSubscriber s1 = new TestSubscriber(); |
452 |
TestSubscriber s2 = new TestSubscriber(); |
453 |
p.subscribe(s1); |
454 |
p.subscribe(s2); |
455 |
s1.awaitSubscribe(); |
456 |
p.submit(1); |
457 |
s1.throwOnCall = true; |
458 |
p.submit(2); |
459 |
p.close(); |
460 |
s2.awaitComplete(); |
461 |
assertEquals(2, s2.nexts); |
462 |
assertEquals(1, s2.completes); |
463 |
s1.awaitError(); |
464 |
assertEquals(1, s1.errors); |
465 |
assertEquals(1, calls.get()); |
466 |
} |
467 |
|
468 |
/** |
469 |
* onNext items are issued in the same order to each subscriber |
470 |
*/ |
471 |
public void testOrder() { |
472 |
SubmissionPublisher<Integer> p = basicPublisher(); |
473 |
TestSubscriber s1 = new TestSubscriber(); |
474 |
TestSubscriber s2 = new TestSubscriber(); |
475 |
p.subscribe(s1); |
476 |
p.subscribe(s2); |
477 |
for (int i = 1; i <= 20; ++i) |
478 |
p.submit(i); |
479 |
p.close(); |
480 |
s2.awaitComplete(); |
481 |
s1.awaitComplete(); |
482 |
assertEquals(20, s2.nexts); |
483 |
assertEquals(1, s2.completes); |
484 |
assertEquals(20, s1.nexts); |
485 |
assertEquals(1, s1.completes); |
486 |
} |
487 |
|
488 |
/** |
489 |
* onNext is issued only if requested |
490 |
*/ |
491 |
public void testRequest1() { |
492 |
SubmissionPublisher<Integer> p = basicPublisher(); |
493 |
TestSubscriber s1 = new TestSubscriber(); |
494 |
s1.request = false; |
495 |
p.subscribe(s1); |
496 |
s1.awaitSubscribe(); |
497 |
assertEquals(0, p.estimateMinimumDemand()); |
498 |
TestSubscriber s2 = new TestSubscriber(); |
499 |
p.subscribe(s2); |
500 |
p.submit(1); |
501 |
p.submit(2); |
502 |
s2.awaitNext(1); |
503 |
assertEquals(0, s1.nexts); |
504 |
s1.sn.request(3); |
505 |
p.submit(3); |
506 |
p.close(); |
507 |
s2.awaitComplete(); |
508 |
assertEquals(3, s2.nexts); |
509 |
assertEquals(1, s2.completes); |
510 |
s1.awaitComplete(); |
511 |
assertTrue(s1.nexts > 0); |
512 |
assertEquals(1, s1.completes); |
513 |
} |
514 |
|
515 |
/** |
516 |
* onNext is not issued when requests become zero |
517 |
*/ |
518 |
public void testRequest2() { |
519 |
SubmissionPublisher<Integer> p = basicPublisher(); |
520 |
TestSubscriber s1 = new TestSubscriber(); |
521 |
TestSubscriber s2 = new TestSubscriber(); |
522 |
p.subscribe(s1); |
523 |
p.subscribe(s2); |
524 |
s2.awaitSubscribe(); |
525 |
s1.awaitSubscribe(); |
526 |
s1.request = false; |
527 |
p.submit(1); |
528 |
p.submit(2); |
529 |
p.close(); |
530 |
s2.awaitComplete(); |
531 |
assertEquals(2, s2.nexts); |
532 |
assertEquals(1, s2.completes); |
533 |
s1.awaitNext(1); |
534 |
assertEquals(1, s1.nexts); |
535 |
} |
536 |
|
537 |
/** |
538 |
* Non-positive request causes error |
539 |
*/ |
540 |
public void testRequest3() { |
541 |
SubmissionPublisher<Integer> p = basicPublisher(); |
542 |
TestSubscriber s1 = new TestSubscriber(); |
543 |
TestSubscriber s2 = new TestSubscriber(); |
544 |
TestSubscriber s3 = new TestSubscriber(); |
545 |
p.subscribe(s1); |
546 |
p.subscribe(s2); |
547 |
p.subscribe(s3); |
548 |
s3.awaitSubscribe(); |
549 |
s2.awaitSubscribe(); |
550 |
s1.awaitSubscribe(); |
551 |
s1.sn.request(-1L); |
552 |
s3.sn.request(0L); |
553 |
p.submit(1); |
554 |
p.submit(2); |
555 |
p.close(); |
556 |
s2.awaitComplete(); |
557 |
assertEquals(2, s2.nexts); |
558 |
assertEquals(1, s2.completes); |
559 |
s1.awaitError(); |
560 |
assertEquals(1, s1.errors); |
561 |
assertTrue(s1.lastError instanceof IllegalArgumentException); |
562 |
s3.awaitError(); |
563 |
assertEquals(1, s3.errors); |
564 |
assertTrue(s3.lastError instanceof IllegalArgumentException); |
565 |
} |
566 |
|
567 |
/** |
568 |
* estimateMinimumDemand reports 0 until request, nonzero after |
569 |
* request, and zero again after delivery |
570 |
*/ |
571 |
public void testEstimateMinimumDemand() { |
572 |
TestSubscriber s = new TestSubscriber(); |
573 |
SubmissionPublisher<Integer> p = basicPublisher(); |
574 |
s.request = false; |
575 |
p.subscribe(s); |
576 |
s.awaitSubscribe(); |
577 |
assertEquals(0, p.estimateMinimumDemand()); |
578 |
s.sn.request(1); |
579 |
assertEquals(1, p.estimateMinimumDemand()); |
580 |
p.submit(1); |
581 |
s.awaitNext(1); |
582 |
assertEquals(0, p.estimateMinimumDemand()); |
583 |
} |
584 |
|
585 |
/** |
586 |
* submit to a publisher with no subscribers returns lag 0 |
587 |
*/ |
588 |
public void testEmptySubmit() { |
589 |
SubmissionPublisher<Integer> p = basicPublisher(); |
590 |
assertEquals(0, p.submit(1)); |
591 |
} |
592 |
|
593 |
/** |
594 |
* submit(null) throws NPE |
595 |
*/ |
596 |
public void testNullSubmit() { |
597 |
SubmissionPublisher<Integer> p = basicPublisher(); |
598 |
try { |
599 |
p.submit(null); |
600 |
shouldThrow(); |
601 |
} catch (NullPointerException success) {} |
602 |
} |
603 |
|
604 |
/** |
605 |
* submit returns number of lagged items, compatible with result |
606 |
* of estimateMaximumLag. |
607 |
*/ |
608 |
public void testLaggedSubmit() { |
609 |
SubmissionPublisher<Integer> p = basicPublisher(); |
610 |
TestSubscriber s1 = new TestSubscriber(); |
611 |
s1.request = false; |
612 |
TestSubscriber s2 = new TestSubscriber(); |
613 |
s2.request = false; |
614 |
p.subscribe(s1); |
615 |
p.subscribe(s2); |
616 |
s2.awaitSubscribe(); |
617 |
s1.awaitSubscribe(); |
618 |
assertEquals(1, p.submit(1)); |
619 |
assertTrue(p.estimateMaximumLag() >= 1); |
620 |
assertTrue(p.submit(2) >= 2); |
621 |
assertTrue(p.estimateMaximumLag() >= 2); |
622 |
s1.sn.request(4); |
623 |
assertTrue(p.submit(3) >= 3); |
624 |
assertTrue(p.estimateMaximumLag() >= 3); |
625 |
s2.sn.request(4); |
626 |
p.submit(4); |
627 |
p.close(); |
628 |
s2.awaitComplete(); |
629 |
assertEquals(4, s2.nexts); |
630 |
s1.awaitComplete(); |
631 |
assertEquals(4, s2.nexts); |
632 |
} |
633 |
|
634 |
/** |
635 |
* submit eventually issues requested items when buffer capacity is 1 |
636 |
*/ |
637 |
public void testCap1Submit() { |
638 |
SubmissionPublisher<Integer> p |
639 |
= new SubmissionPublisher<>(basicExecutor, 1); |
640 |
TestSubscriber s1 = new TestSubscriber(); |
641 |
TestSubscriber s2 = new TestSubscriber(); |
642 |
p.subscribe(s1); |
643 |
p.subscribe(s2); |
644 |
for (int i = 1; i <= 20; ++i) { |
645 |
assertTrue(p.estimateMinimumDemand() <= 1); |
646 |
assertTrue(p.submit(i) >= 0); |
647 |
} |
648 |
p.close(); |
649 |
s2.awaitComplete(); |
650 |
s1.awaitComplete(); |
651 |
assertEquals(20, s2.nexts); |
652 |
assertEquals(1, s2.completes); |
653 |
assertEquals(20, s1.nexts); |
654 |
assertEquals(1, s1.completes); |
655 |
} |
656 |
|
657 |
static boolean noopHandle(AtomicInteger count) { |
658 |
count.getAndIncrement(); |
659 |
return false; |
660 |
} |
661 |
|
662 |
static boolean reqHandle(AtomicInteger count, Subscriber s) { |
663 |
count.getAndIncrement(); |
664 |
((TestSubscriber)s).sn.request(Long.MAX_VALUE); |
665 |
return true; |
666 |
} |
667 |
|
668 |
/** |
669 |
* offer to a publisher with no subscribers returns lag 0 |
670 |
*/ |
671 |
public void testEmptyOffer() { |
672 |
SubmissionPublisher<Integer> p = basicPublisher(); |
673 |
assertEquals(0, p.offer(1, null)); |
674 |
} |
675 |
|
676 |
/** |
677 |
* offer(null) throws NPE |
678 |
*/ |
679 |
public void testNullOffer() { |
680 |
SubmissionPublisher<Integer> p = basicPublisher(); |
681 |
try { |
682 |
p.offer(null, null); |
683 |
shouldThrow(); |
684 |
} catch (NullPointerException success) {} |
685 |
} |
686 |
|
687 |
/** |
688 |
* offer returns number of lagged items if not saturated |
689 |
*/ |
690 |
public void testLaggedOffer() { |
691 |
SubmissionPublisher<Integer> p = basicPublisher(); |
692 |
TestSubscriber s1 = new TestSubscriber(); |
693 |
s1.request = false; |
694 |
TestSubscriber s2 = new TestSubscriber(); |
695 |
s2.request = false; |
696 |
p.subscribe(s1); |
697 |
p.subscribe(s2); |
698 |
s2.awaitSubscribe(); |
699 |
s1.awaitSubscribe(); |
700 |
assertTrue(p.offer(1, null) >= 1); |
701 |
assertTrue(p.offer(2, null) >= 2); |
702 |
s1.sn.request(4); |
703 |
assertTrue(p.offer(3, null) >= 3); |
704 |
s2.sn.request(4); |
705 |
p.offer(4, null); |
706 |
p.close(); |
707 |
s2.awaitComplete(); |
708 |
assertEquals(4, s2.nexts); |
709 |
s1.awaitComplete(); |
710 |
assertEquals(4, s2.nexts); |
711 |
} |
712 |
|
713 |
/** |
714 |
* offer reports drops if saturated |
715 |
*/ |
716 |
public void testDroppedOffer() { |
717 |
SubmissionPublisher<Integer> p |
718 |
= new SubmissionPublisher<>(basicExecutor, 4); |
719 |
TestSubscriber s1 = new TestSubscriber(); |
720 |
s1.request = false; |
721 |
TestSubscriber s2 = new TestSubscriber(); |
722 |
s2.request = false; |
723 |
p.subscribe(s1); |
724 |
p.subscribe(s2); |
725 |
s2.awaitSubscribe(); |
726 |
s1.awaitSubscribe(); |
727 |
for (int i = 1; i <= 4; ++i) |
728 |
assertTrue(p.offer(i, null) >= 0); |
729 |
p.offer(5, null); |
730 |
assertTrue(p.offer(6, null) < 0); |
731 |
s1.sn.request(64); |
732 |
assertTrue(p.offer(7, null) < 0); |
733 |
s2.sn.request(64); |
734 |
p.close(); |
735 |
s2.awaitComplete(); |
736 |
assertTrue(s2.nexts >= 4); |
737 |
s1.awaitComplete(); |
738 |
assertTrue(s1.nexts >= 4); |
739 |
} |
740 |
|
741 |
/** |
742 |
* offer invokes drop handler if saturated |
743 |
*/ |
744 |
public void testHandledDroppedOffer() { |
745 |
AtomicInteger calls = new AtomicInteger(); |
746 |
SubmissionPublisher<Integer> p |
747 |
= new SubmissionPublisher<>(basicExecutor, 4); |
748 |
TestSubscriber s1 = new TestSubscriber(); |
749 |
s1.request = false; |
750 |
TestSubscriber s2 = new TestSubscriber(); |
751 |
s2.request = false; |
752 |
p.subscribe(s1); |
753 |
p.subscribe(s2); |
754 |
s2.awaitSubscribe(); |
755 |
s1.awaitSubscribe(); |
756 |
for (int i = 1; i <= 4; ++i) |
757 |
assertTrue(p.offer(i, (s, x) -> noopHandle(calls)) >= 0); |
758 |
p.offer(4, (s, x) -> noopHandle(calls)); |
759 |
assertTrue(p.offer(6, (s, x) -> noopHandle(calls)) < 0); |
760 |
s1.sn.request(64); |
761 |
assertTrue(p.offer(7, (s, x) -> noopHandle(calls)) < 0); |
762 |
s2.sn.request(64); |
763 |
p.close(); |
764 |
s2.awaitComplete(); |
765 |
s1.awaitComplete(); |
766 |
assertTrue(calls.get() >= 4); |
767 |
} |
768 |
|
769 |
/** |
770 |
* offer succeeds if drop handler forces request |
771 |
*/ |
772 |
public void testRecoveredHandledDroppedOffer() { |
773 |
AtomicInteger calls = new AtomicInteger(); |
774 |
SubmissionPublisher<Integer> p |
775 |
= new SubmissionPublisher<>(basicExecutor, 4); |
776 |
TestSubscriber s1 = new TestSubscriber(); |
777 |
s1.request = false; |
778 |
TestSubscriber s2 = new TestSubscriber(); |
779 |
s2.request = false; |
780 |
p.subscribe(s1); |
781 |
p.subscribe(s2); |
782 |
s2.awaitSubscribe(); |
783 |
s1.awaitSubscribe(); |
784 |
int n = 0; |
785 |
for (int i = 1; i <= 8; ++i) { |
786 |
int d = p.offer(i, (s, x) -> reqHandle(calls, s)); |
787 |
n = n + 2 + (d < 0 ? d : 0); |
788 |
} |
789 |
p.close(); |
790 |
s2.awaitComplete(); |
791 |
s1.awaitComplete(); |
792 |
assertEquals(n, s1.nexts + s2.nexts); |
793 |
assertTrue(calls.get() >= 2); |
794 |
} |
795 |
|
796 |
/** |
797 |
* Timed offer to a publisher with no subscribers returns lag 0 |
798 |
*/ |
799 |
public void testEmptyTimedOffer() { |
800 |
SubmissionPublisher<Integer> p = basicPublisher(); |
801 |
long startTime = System.nanoTime(); |
802 |
assertEquals(0, p.offer(1, LONG_DELAY_MS, MILLISECONDS, null)); |
803 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2); |
804 |
} |
805 |
|
806 |
/** |
807 |
* Timed offer with null item or TimeUnit throws NPE |
808 |
*/ |
809 |
public void testNullTimedOffer() { |
810 |
SubmissionPublisher<Integer> p = basicPublisher(); |
811 |
long startTime = System.nanoTime(); |
812 |
try { |
813 |
p.offer(null, LONG_DELAY_MS, MILLISECONDS, null); |
814 |
shouldThrow(); |
815 |
} catch (NullPointerException success) {} |
816 |
try { |
817 |
p.offer(1, LONG_DELAY_MS, null, null); |
818 |
shouldThrow(); |
819 |
} catch (NullPointerException success) {} |
820 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2); |
821 |
} |
822 |
|
823 |
/** |
824 |
* Timed offer returns number of lagged items if not saturated |
825 |
*/ |
826 |
public void testLaggedTimedOffer() { |
827 |
SubmissionPublisher<Integer> p = basicPublisher(); |
828 |
TestSubscriber s1 = new TestSubscriber(); |
829 |
s1.request = false; |
830 |
TestSubscriber s2 = new TestSubscriber(); |
831 |
s2.request = false; |
832 |
p.subscribe(s1); |
833 |
p.subscribe(s2); |
834 |
s2.awaitSubscribe(); |
835 |
s1.awaitSubscribe(); |
836 |
long startTime = System.nanoTime(); |
837 |
assertTrue(p.offer(1, LONG_DELAY_MS, MILLISECONDS, null) >= 1); |
838 |
assertTrue(p.offer(2, LONG_DELAY_MS, MILLISECONDS, null) >= 2); |
839 |
s1.sn.request(4); |
840 |
assertTrue(p.offer(3, LONG_DELAY_MS, MILLISECONDS, null) >= 3); |
841 |
s2.sn.request(4); |
842 |
p.offer(4, LONG_DELAY_MS, MILLISECONDS, null); |
843 |
p.close(); |
844 |
s2.awaitComplete(); |
845 |
assertEquals(4, s2.nexts); |
846 |
s1.awaitComplete(); |
847 |
assertEquals(4, s2.nexts); |
848 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2); |
849 |
} |
850 |
|
851 |
/** |
852 |
* Timed offer reports drops if saturated |
853 |
*/ |
854 |
public void testDroppedTimedOffer() { |
855 |
SubmissionPublisher<Integer> p |
856 |
= new SubmissionPublisher<>(basicExecutor, 4); |
857 |
TestSubscriber s1 = new TestSubscriber(); |
858 |
s1.request = false; |
859 |
TestSubscriber s2 = new TestSubscriber(); |
860 |
s2.request = false; |
861 |
p.subscribe(s1); |
862 |
p.subscribe(s2); |
863 |
s2.awaitSubscribe(); |
864 |
s1.awaitSubscribe(); |
865 |
long delay = timeoutMillis(); |
866 |
for (int i = 1; i <= 4; ++i) |
867 |
assertTrue(p.offer(i, delay, MILLISECONDS, null) >= 0); |
868 |
long startTime = System.nanoTime(); |
869 |
assertTrue(p.offer(5, delay, MILLISECONDS, null) < 0); |
870 |
s1.sn.request(64); |
871 |
assertTrue(p.offer(6, delay, MILLISECONDS, null) < 0); |
872 |
// 2 * delay should elapse but check only 1 * delay to allow timer slop |
873 |
assertTrue(millisElapsedSince(startTime) >= delay); |
874 |
s2.sn.request(64); |
875 |
p.close(); |
876 |
s2.awaitComplete(); |
877 |
assertTrue(s2.nexts >= 2); |
878 |
s1.awaitComplete(); |
879 |
assertTrue(s1.nexts >= 2); |
880 |
} |
881 |
|
882 |
/** |
883 |
* Timed offer invokes drop handler if saturated |
884 |
*/ |
885 |
public void testHandledDroppedTimedOffer() { |
886 |
AtomicInteger calls = new AtomicInteger(); |
887 |
SubmissionPublisher<Integer> p |
888 |
= new SubmissionPublisher<>(basicExecutor, 4); |
889 |
TestSubscriber s1 = new TestSubscriber(); |
890 |
s1.request = false; |
891 |
TestSubscriber s2 = new TestSubscriber(); |
892 |
s2.request = false; |
893 |
p.subscribe(s1); |
894 |
p.subscribe(s2); |
895 |
s2.awaitSubscribe(); |
896 |
s1.awaitSubscribe(); |
897 |
long delay = timeoutMillis(); |
898 |
for (int i = 1; i <= 4; ++i) |
899 |
assertTrue(p.offer(i, delay, MILLISECONDS, (s, x) -> noopHandle(calls)) >= 0); |
900 |
long startTime = System.nanoTime(); |
901 |
assertTrue(p.offer(5, delay, MILLISECONDS, (s, x) -> noopHandle(calls)) < 0); |
902 |
s1.sn.request(64); |
903 |
assertTrue(p.offer(6, delay, MILLISECONDS, (s, x) -> noopHandle(calls)) < 0); |
904 |
assertTrue(millisElapsedSince(startTime) >= delay); |
905 |
s2.sn.request(64); |
906 |
p.close(); |
907 |
s2.awaitComplete(); |
908 |
s1.awaitComplete(); |
909 |
assertTrue(calls.get() >= 2); |
910 |
} |
911 |
|
912 |
/** |
913 |
* Timed offer succeeds if drop handler forces request |
914 |
*/ |
915 |
public void testRecoveredHandledDroppedTimedOffer() { |
916 |
AtomicInteger calls = new AtomicInteger(); |
917 |
SubmissionPublisher<Integer> p |
918 |
= new SubmissionPublisher<>(basicExecutor, 4); |
919 |
TestSubscriber s1 = new TestSubscriber(); |
920 |
s1.request = false; |
921 |
TestSubscriber s2 = new TestSubscriber(); |
922 |
s2.request = false; |
923 |
p.subscribe(s1); |
924 |
p.subscribe(s2); |
925 |
s2.awaitSubscribe(); |
926 |
s1.awaitSubscribe(); |
927 |
int n = 0; |
928 |
long delay = timeoutMillis(); |
929 |
long startTime = System.nanoTime(); |
930 |
for (int i = 1; i <= 6; ++i) { |
931 |
int d = p.offer(i, delay, MILLISECONDS, (s, x) -> reqHandle(calls, s)); |
932 |
n = n + 2 + (d < 0 ? d : 0); |
933 |
} |
934 |
assertTrue(millisElapsedSince(startTime) >= delay); |
935 |
p.close(); |
936 |
s2.awaitComplete(); |
937 |
s1.awaitComplete(); |
938 |
assertEquals(n, s1.nexts + s2.nexts); |
939 |
assertTrue(calls.get() >= 2); |
940 |
} |
941 |
|
942 |
/** |
943 |
* consume returns a CompletableFuture that is done when |
944 |
* publisher completes |
945 |
*/ |
946 |
public void testConsume() { |
947 |
AtomicInteger sum = new AtomicInteger(); |
948 |
SubmissionPublisher<Integer> p = basicPublisher(); |
949 |
CompletableFuture<Void> f = |
950 |
p.consume((Integer x) -> sum.getAndAdd(x.intValue())); |
951 |
int n = 20; |
952 |
for (int i = 1; i <= n; ++i) |
953 |
p.submit(i); |
954 |
p.close(); |
955 |
f.join(); |
956 |
assertEquals((n * (n + 1)) / 2, sum.get()); |
957 |
} |
958 |
|
959 |
/** |
960 |
* consume(null) throws NPE |
961 |
*/ |
962 |
public void testConsumeNPE() { |
963 |
SubmissionPublisher<Integer> p = basicPublisher(); |
964 |
try { |
965 |
CompletableFuture<Void> f = p.consume(null); |
966 |
shouldThrow(); |
967 |
} catch (NullPointerException success) {} |
968 |
} |
969 |
|
970 |
/** |
971 |
* consume eventually stops processing published items if cancelled |
972 |
*/ |
973 |
public void testCancelledConsume() { |
974 |
AtomicInteger count = new AtomicInteger(); |
975 |
SubmissionPublisher<Integer> p = basicPublisher(); |
976 |
CompletableFuture<Void> f = p.consume(x -> count.getAndIncrement()); |
977 |
f.cancel(true); |
978 |
int n = 1000000; // arbitrary limit |
979 |
for (int i = 1; i <= n; ++i) |
980 |
p.submit(i); |
981 |
assertTrue(count.get() < n); |
982 |
} |
983 |
|
984 |
} |