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1
4 package com.tc.util.concurrent;
5
6 import junit.framework.TestCase;
7
8
13 public class SetOnceRefTest extends TestCase {
14
15 public void testAllowsNull() {
16 SetOnceRef ref = new SetOnceRef(false);
17
18 assertFalse(ref.allowsNull());
19
20 try {
21 ref.set(null);
22 fail();
23 } catch (IllegalArgumentException  iae) {
24 }
26
27 Object val = new Object ();
28 ref.set(val);
29
30 assertTrue(ref.get() == val);
31 }
32
33 public void testSetNull() {
34 final SetOnceRef ref1 = new SetOnceRef(true);
35 ref1.set(null);
36 final SetOnceRef ref2 = new SetOnceRef(null, true);
37
38 assertTrue(ref1.get() == null);
39 assertTrue(ref2.get() == null);
40 }
41
42 public void testSetTwice() {
43 final Object val1 = new Object ();
44 final Object val2 = new Object ();
45
46 final SetOnceRef ref1 = new SetOnceRef();
47 ref1.set(val1);
48 final SetOnceRef ref2 = new SetOnceRef(val2);
49
50 assertTrue(ref1.get() == val1);
51 assertTrue(ref2.get() == val2);
52
53 try {
54 ref1.set(val1);
55 fail();
56 } catch (IllegalStateException e) {
57 }
59
60 try {
61 ref2.set(val2);
62 fail();
63 } catch (IllegalStateException e) {
64 }
66 }
67
68 public void testGetMany() {
69 final Object JUnitGetsMeHard = new Object ();
70 final SetOnceRef ref = new SetOnceRef(JUnitGetsMeHard);
71
72 for (int i = 0; i < 1000; i++) {
73 assertTrue(ref.get() == JUnitGetsMeHard);
74 }
75 }
76
77 public void testThreadAccess() throws InterruptedException {
78 final Object val = new Object ();
79
80 final SetOnceRef ref = new SetOnceRef();
81
82 Thread other = new Thread (new Runnable () {
83 public void run() {
84 ref.set(val);
85 }
86 });
87
88 other.start();
89 other.join();
90
91 assertTrue(ref.get() == val);
92 }
93
94 }
95 |
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