1 | // License: GPL. For details, see LICENSE file.
|
---|
2 | package org.openstreetmap.josm.tools;
|
---|
3 |
|
---|
4 | import static org.junit.jupiter.api.Assertions.assertFalse;
|
---|
5 | import static org.junit.jupiter.api.Assertions.assertNotNull;
|
---|
6 | import static org.junit.jupiter.api.Assertions.assertNull;
|
---|
7 | import static org.junit.jupiter.api.Assertions.assertSame;
|
---|
8 | import static org.junit.jupiter.api.Assertions.assertTrue;
|
---|
9 |
|
---|
10 | import org.junit.jupiter.api.extension.RegisterExtension;
|
---|
11 | import org.junit.jupiter.api.Test;
|
---|
12 | import org.openstreetmap.josm.testutils.JOSMTestRules;
|
---|
13 |
|
---|
14 | import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
|
---|
15 |
|
---|
16 | /**
|
---|
17 | * Tests for {@link ListenableWeakReference}
|
---|
18 | * @author Michael Zangl
|
---|
19 | * @since 12181
|
---|
20 | */
|
---|
21 | class ListenableWeakReferenceTest {
|
---|
22 | /**
|
---|
23 | * Default test rules.
|
---|
24 | */
|
---|
25 | @RegisterExtension
|
---|
26 | @SuppressFBWarnings(value = "URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD")
|
---|
27 | public JOSMTestRules test = new JOSMTestRules();
|
---|
28 | private Object object;
|
---|
29 | private boolean called;
|
---|
30 |
|
---|
31 | /**
|
---|
32 | * Tests that {@link ListenableWeakReference#onDereference()} is called.
|
---|
33 | * @throws InterruptedException never
|
---|
34 | */
|
---|
35 | @Test
|
---|
36 | void testOnDereference() throws InterruptedException {
|
---|
37 | object = new Object();
|
---|
38 | called = false;
|
---|
39 | ListenableWeakReference<Object> weak = new ListenableWeakReference<>(object, () -> called = true);
|
---|
40 | assertFalse(called);
|
---|
41 | assertSame(object, weak.get());
|
---|
42 |
|
---|
43 | // now delete it
|
---|
44 | object = null;
|
---|
45 | System.gc();
|
---|
46 | System.runFinalization();
|
---|
47 | // now we wait for the listener thread
|
---|
48 | Thread.sleep(200);
|
---|
49 | assertTrue(called);
|
---|
50 |
|
---|
51 | assertNotNull(weak);
|
---|
52 | assertNull(weak.get());
|
---|
53 | }
|
---|
54 |
|
---|
55 | }
|
---|