forked from grpc/grpc-java
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathContextTest.java
More file actions
410 lines (363 loc) · 13.2 KB
/
ContextTest.java
File metadata and controls
410 lines (363 loc) · 13.2 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
/*
* Copyright 2015, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package io.grpc;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import com.google.common.util.concurrent.MoreExecutors;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* Tests for {@link Context}.
*/
@RunWith(JUnit4.class)
public class ContextTest {
private static final Context.Key<String> PET = Context.key("pet");
private static final Context.Key<String> FOOD = Context.keyWithDefault("food", "lasagna");
private static final Context.Key<String> COLOR = Context.key("color");
private static final Context.Key<Object> OBSERVED = Context.key("observed");
private Context listenerNotifedContext;
private CountDownLatch deadlineLatch = new CountDownLatch(1);
private Context.CancellationListener cancellationListener = new Context.CancellationListener() {
@Override
public void cancelled(Context context) {
listenerNotifedContext = context;
deadlineLatch.countDown();
}
};
private CountDownLatch observableLatch = new CountDownLatch(1);
private Object observed;
private Runnable runner = new Runnable() {
@Override
public void run() {
observed = OBSERVED.get();
observableLatch.countDown();
}
};
private ExecutorService executorService = Executors.newCachedThreadPool();
@Before
public void setUp() throws Exception {
// Detach all contexts back to the root.
while (Context.current() != Context.ROOT) {
Context.current().detach();
}
}
@After
public void tearDown() throws Exception {
}
@Test
public void rootIsInitialContext() {
assertNotNull(Context.ROOT);
assertTrue(Context.ROOT.isCurrent());
}
@Test
public void rootIsAlwaysBound() {
Context root = Context.current();
try {
root.detach();
} catch (IllegalStateException ise) {
// Expected
assertTrue(Context.ROOT.isCurrent());
return;
}
fail("Attempting to detach root should fail");
}
@Test
public void rootCanBeAttached() {
Context root = Context.current();
Context.CancellableContext fork = root.fork();
fork.attach();
root.attach();
assertTrue(root.isCurrent());
root.detach();
assertTrue(fork.isCurrent());
fork.detach();
assertTrue(root.isCurrent());
}
@Test
public void rootCanNeverHaveAListener() {
Context root = Context.current();
root.addListener(cancellationListener, MoreExecutors.directExecutor());
assertEquals(0, root.listenerCount());
}
@Test
public void attachedCancellableContextCannotBeCastFromCurrent() {
Context initial = Context.current();
Context.CancellableContext base = Context.current().withCancellation();
base.attach();
assertFalse(Context.current() instanceof Context.CancellableContext);
assertNotSame(initial, Context.current());
base.detachAndCancel(null);
assertTrue(initial.isCurrent());
}
@Test
public void detachingNonCurrentThrowsIllegalStateException() {
Context base = Context.current().fork();
try {
base.detach();
} catch (IllegalStateException ise) {
return;
}
fail("Expected exception");
}
@Test
public void detachUnwindsAttach() {
Context base = Context.current().fork();
Context child = base.withValue(COLOR, "red");
Context grandchild = child.withValue(COLOR, "blue");
base.attach();
base.attach();
child.attach();
base.attach();
grandchild.attach();
assertTrue(grandchild.isCurrent());
grandchild.detach();
assertTrue(base.isCurrent());
base.detach();
assertTrue(child.isCurrent());
child.detach();
assertTrue(base.isCurrent());
base.detach();
assertTrue(base.isCurrent());
base.detach();
assertTrue(Context.ROOT.isCurrent());
}
@Test
public void valuesAndOverrides() {
Context base = Context.current().withValue(PET, "dog");
Context child = base.withValues(PET, null, FOOD, "cheese");
base.attach();
assertEquals("dog", PET.get());
assertEquals("lasagna", FOOD.get());
assertNull(COLOR.get());
child.attach();
assertNull(PET.get());
assertEquals("cheese", FOOD.get());
assertNull(COLOR.get());
child.detach();
// Should have values from base
assertEquals("dog", PET.get());
assertEquals("lasagna", FOOD.get());
assertNull(COLOR.get());
base.detach();
assertNull(PET.get());
assertEquals("lasagna", FOOD.get());
assertNull(COLOR.get());
}
@Test
public void cancelReturnsFalseIfAlreadyCancelled() {
Context.CancellableContext base = Context.current().withCancellation();
assertTrue(base.cancel(null));
assertTrue(base.isCancelled());
assertFalse(base.cancel(null));
}
@Test
public void notifyListenerOnCancel() {
Context.CancellableContext base = Context.current().withCancellation();
base.attach();
base.addListener(cancellationListener, MoreExecutors.directExecutor());
base.detachAndCancel(null);
assertSame(base, listenerNotifedContext);
}
@Test
public void cascadingCancellationNotifiesChild() {
// Root is not cancellable so we can't cascade from it
Context.CancellableContext base = Context.current().withCancellation();
assertEquals(0, base.listenerCount());
Context child = base.withValue(FOOD, "lasagna");
assertEquals(0, child.listenerCount());
child.addListener(cancellationListener, MoreExecutors.directExecutor());
assertEquals(1, child.listenerCount());
assertEquals(1, base.listenerCount()); // child is now listening to base
assertFalse(base.isCancelled());
assertFalse(child.isCancelled());
IllegalStateException cause = new IllegalStateException();
base.cancel(cause);
assertTrue(base.isCancelled());
assertSame(cause, base.cause());
assertSame(child, listenerNotifedContext);
assertTrue(child.isCancelled());
assertSame(cause, child.cause());
assertEquals(0, base.listenerCount());
assertEquals(0, child.listenerCount());
}
@Test
public void cancellableContextCascadesFromCancellableParent() {
// Root is not cancellable so we can't cascade from it
Context.CancellableContext base = Context.current().withCancellation();
Context child = base.withCancellation();
child.addListener(cancellationListener, MoreExecutors.directExecutor());
assertFalse(base.isCancelled());
assertFalse(child.isCancelled());
IllegalStateException cause = new IllegalStateException();
base.cancel(cause);
assertTrue(base.isCancelled());
assertSame(cause, base.cause());
assertSame(child, listenerNotifedContext);
assertTrue(child.isCancelled());
assertSame(cause, child.cause());
assertEquals(0, base.listenerCount());
assertEquals(0, child.listenerCount());
}
@Test
public void nonCascadingCancellationDoesNotNotifyForked() {
Context.CancellableContext base = Context.current().withCancellation();
Context fork = base.fork();
fork.addListener(cancellationListener, MoreExecutors.directExecutor());
assertTrue(base.cancel(null));
assertNull(listenerNotifedContext);
assertFalse(fork.isCancelled());
assertEquals(1, fork.listenerCount());
}
@Test
public void testWrapRunnable() throws Exception {
Context base = Context.current().withValue(OBSERVED, "cat");
executorService.execute(base.wrap(runner));
observableLatch.await();
assertEquals("cat", observed);
observableLatch = new CountDownLatch(1);
executorService.execute(Context.current().wrap(runner));
observableLatch.await();
assertNull(observed);
}
@Test
public void typicalTryFinallyHandling() throws Exception {
Context base = Context.current().withValue(COLOR, "blue");
base.attach();
try {
assertTrue(base.isCurrent());
// Do something
} finally {
base.detach();
}
assertFalse(base.isCurrent());
}
@Test
public void typicalCancellableTryCatchFinallyHandling() throws Exception {
Context.CancellableContext base = Context.current().withCancellation();
base.attach();
try {
// Do something
throw new IllegalStateException("Argh");
} catch (IllegalStateException ise) {
base.cancel(ise);
} finally {
base.detachAndCancel(null);
}
assertTrue(base.isCancelled());
assertNotNull(base.cause());
}
/*
public void testTryWithResource() throws Exception {
Context.CancellableContext base = Context.current().withCancellation();
try (Closeable c = base.attachAsCloseable()) {
// Do something
throw new IllegalStateException("Argh");
} catch (IllegalStateException ise) {
// Don't capture exception
}
assertTrue(base.isCancelled());
assertNull(base.cause());
}
public void testTryWithResource() throws Exception {
Context.CancellableContext base = Context.current().withCancellation();
try (Closeable c = base.attachAsCloseable()) {
// Do something
throw new IllegalStateException("Argh");
} catch (IllegalStateException ise) {
base.cancel(ise);
}
assertTrue(base.isCancelled());
assertNotNull(base.cause());
}
*/
@Test
public void absoluteDeadlineTriggersAndPropagates() throws Exception {
Context base = Context.current().withDeadlineNanoTime(System.nanoTime()
+ TimeUnit.SECONDS.toNanos(1));
Context child = base.withValue(FOOD, "lasagna");
child.addListener(cancellationListener, MoreExecutors.directExecutor());
assertFalse(base.isCancelled());
assertFalse(child.isCancelled());
deadlineLatch.await(2, TimeUnit.SECONDS);
assertTrue(base.isCancelled());
assertTrue(base.cause() instanceof TimeoutException);
assertSame(child, listenerNotifedContext);
assertTrue(child.isCancelled());
assertSame(base.cause(), child.cause());
}
@Test
public void relativeDeadlineTriggersAndPropagates() throws Exception {
Context base = Context.current().withDeadlineAfter(1, TimeUnit.SECONDS);
Context child = base.withValue(FOOD, "lasagna");
child.addListener(cancellationListener, MoreExecutors.directExecutor());
assertFalse(base.isCancelled());
assertFalse(child.isCancelled());
deadlineLatch.await(2, TimeUnit.SECONDS);
assertTrue(base.isCancelled());
assertTrue(base.cause() instanceof TimeoutException);
assertSame(child, listenerNotifedContext);
assertTrue(child.isCancelled());
assertSame(base.cause(), child.cause());
}
@Test
public void innerDeadlineCompletesBeforeOuter() throws Exception {
Context base = Context.current().withDeadlineAfter(2, TimeUnit.SECONDS);
Context child = base.withDeadlineAfter(1, TimeUnit.SECONDS);
child.addListener(cancellationListener, MoreExecutors.directExecutor());
assertFalse(base.isCancelled());
assertFalse(child.isCancelled());
deadlineLatch.await(2, TimeUnit.SECONDS);
assertFalse(base.isCancelled());
assertSame(child, listenerNotifedContext);
assertTrue(child.isCancelled());
assertTrue(child.cause() instanceof TimeoutException);
deadlineLatch = new CountDownLatch(1);
base.addListener(cancellationListener, MoreExecutors.directExecutor());
deadlineLatch.await(2, TimeUnit.SECONDS);
assertTrue(base.isCancelled());
assertTrue(base.cause() instanceof TimeoutException);
assertNotSame(base.cause(), child.cause());
}
}