test/tck/AtomicLongFieldUpdaterTest.java

/*
 * Written by members of JCP JSR-166 Expert Group and released to the
 * public domain. Use, modify, and redistribute this code in any way
 * without acknowledgement. Other contributors include Andrew Wright,
 * Jeffrey Hayes, Pat Fischer, Mike Judd.
 */

import java.util.concurrent.atomic.*;
import junit.framework.*;
import java.util.*;

public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
    volatile long x = 0;
    int z;
    long w;

    public static void main(String[] args){
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicLongFieldUpdaterTest.class);
    }

    /**
     * Contruction with non-existent field throws RuntimeException
     */
    public void testConstructor(){
        try{
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 
                a = AtomicLongFieldUpdater.newUpdater
                (AtomicLongFieldUpdaterTest.class, "y");
            shouldThrow();
        }
        catch (RuntimeException rt) {}
    }

    /**
     * construction with field not of given type throws RuntimeException
     */
    public void testConstructor2(){
        try{
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 
                a = AtomicLongFieldUpdater.newUpdater
                (AtomicLongFieldUpdaterTest.class, "z");
            shouldThrow();
        }
        catch (RuntimeException rt) {}
    }

    /**
     * construction with non-volatile field throws RuntimeException
     */
    public void testConstructor3(){
        try{
            AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> 
                a = AtomicLongFieldUpdater.newUpdater
                (AtomicLongFieldUpdaterTest.class, "w");
            shouldThrow();
        }

        catch (RuntimeException rt) {}
    }

    /**
     *  get returns the last value set or assigned
     */
    public void testGetSet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.get(this));
        a.set(this,2);
        assertEquals(2,a.get(this));
        a.set(this,-3);
        assertEquals(-3,a.get(this));
        
    }
    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertTrue(a.compareAndSet(this,1,2));
        assertTrue(a.compareAndSet(this,2,-4));
        assertEquals(-4,a.get(this));
        assertFalse(a.compareAndSet(this,-5,7));
        assertFalse((7 == a.get(this)));
        assertTrue(a.compareAndSet(this,-4,7));
        assertEquals(7,a.get(this));
    }


    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() {
        x = 1;
        final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");

        Thread t = new Thread(new Runnable() {
                public void run() {
                    while(!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) Thread.yield();
                }});
        try {
            t.start();
            assertTrue(a.compareAndSet(this, 1, 2));
            t.join(LONG_DELAY_MS);
            assertFalse(t.isAlive());
            assertEquals(a.get(this), 3);
        }
        catch(Exception e) {
            unexpectedException();
        }
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected 
     */
    public void testWeakCompareAndSet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        while(!a.weakCompareAndSet(this,1,2));
        while(!a.weakCompareAndSet(this,2,-4));
        assertEquals(-4,a.get(this));
        while(!a.weakCompareAndSet(this,-4,7));
        assertEquals(7,a.get(this));
    }

    /**
     *  getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndSet(this, 0));
        assertEquals(0,a.getAndSet(this,-10));
        assertEquals(-10,a.getAndSet(this,1));
    }

    /**
     * getAndAdd returns previous value and adds given value
     */
    public void testGetAndAdd(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndAdd(this,2));
        assertEquals(3,a.get(this));
        assertEquals(3,a.getAndAdd(this,-4));
        assertEquals(-1,a.get(this));
    }

    /**
     * getAndDecrement returns previous value and decrements
     */
    public void testGetAndDecrement(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndDecrement(this));
        assertEquals(0,a.getAndDecrement(this));
        assertEquals(-1,a.getAndDecrement(this));
    }

    /**
     * getAndIncrement returns previous value and increments
     */
    public void testGetAndIncrement(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(1,a.getAndIncrement(this));
        assertEquals(2,a.get(this));
        a.set(this,-2);
        assertEquals(-2,a.getAndIncrement(this));
        assertEquals(-1,a.getAndIncrement(this));
        assertEquals(0,a.getAndIncrement(this));
        assertEquals(1,a.get(this));
    }

    /**
     * addAndGet adds given value to current, and returns current value
     */
    public void testAddAndGet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(3,a.addAndGet(this,2));
        assertEquals(3,a.get(this));
        assertEquals(-1,a.addAndGet(this,-4));
        assertEquals(-1,a.get(this));
    }

    /**
     *  decrementAndGet decrements and returns current value
     */
    public void testDecrementAndGet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(0,a.decrementAndGet(this));
        assertEquals(-1,a.decrementAndGet(this));
        assertEquals(-2,a.decrementAndGet(this));
        assertEquals(-2,a.get(this));
    }

    /**
     * incrementAndGet increments and returns current value
     */
    public void testIncrementAndGet(){
        AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
        x = 1;
        assertEquals(2,a.incrementAndGet(this));
        assertEquals(2,a.get(this));
        a.set(this,-2);
        assertEquals(-1,a.incrementAndGet(this));
        assertEquals(0,a.incrementAndGet(this));
        assertEquals(1,a.incrementAndGet(this));
        assertEquals(1,a.get(this));
    }

}
Revision:	1.5
Committed:	Sat Oct 25 16:02:13 2003 UTC (20 years, 6 months ago) by dl
Branch:	MAIN
CVS Tags:	JSR166_NOV3_FREEZE, JSR166_DEC9_PRE_ES_SUBMIT, JSR166_DEC9_POST_ES_SUBMIT
Changes since 1.4:	+14 -14 lines
Log Message:	Added PrivilegedFutureTaskTest
#	Content
1	/*
2	* Written by members of JCP JSR-166 Expert Group and released to the
3	* public domain. Use, modify, and redistribute this code in any way
4	* without acknowledgement. Other contributors include Andrew Wright,
5	* Jeffrey Hayes, Pat Fischer, Mike Judd.
6	*/
7
8	import java.util.concurrent.atomic.*;
9	import junit.framework.*;
10	import java.util.*;
11
12	public class AtomicLongFieldUpdaterTest extends JSR166TestCase {
13	volatile long x = 0;
14	int z;
15	long w;
16
17	public static void main(String[] args){
18	junit.textui.TestRunner.run(suite());
19	}
20	public static Test suite() {
21	return new TestSuite(AtomicLongFieldUpdaterTest.class);
22	}
23
24	/**
25	* Contruction with non-existent field throws RuntimeException
26	*/
27	public void testConstructor(){
28	try{
29	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
30	a = AtomicLongFieldUpdater.newUpdater
31	(AtomicLongFieldUpdaterTest.class, "y");
32	shouldThrow();
33	}
34	catch (RuntimeException rt) {}
35	}
36
37	/**
38	* construction with field not of given type throws RuntimeException
39	*/
40	public void testConstructor2(){
41	try{
42	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
43	a = AtomicLongFieldUpdater.newUpdater
44	(AtomicLongFieldUpdaterTest.class, "z");
45	shouldThrow();
46	}
47	catch (RuntimeException rt) {}
48	}
49
50	/**
51	* construction with non-volatile field throws RuntimeException
52	*/
53	public void testConstructor3(){
54	try{
55	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>
56	a = AtomicLongFieldUpdater.newUpdater
57	(AtomicLongFieldUpdaterTest.class, "w");
58	shouldThrow();
59	}
60
61	catch (RuntimeException rt) {}
62	}
63
64	/**
65	* get returns the last value set or assigned
66	*/
67	public void testGetSet(){
68	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
69	x = 1;
70	assertEquals(1,a.get(this));
71	a.set(this,2);
72	assertEquals(2,a.get(this));
73	a.set(this,-3);
74	assertEquals(-3,a.get(this));
75
76	}
77	/**
78	* compareAndSet succeeds in changing value if equal to expected else fails
79	*/
80	public void testCompareAndSet(){
81	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
82	x = 1;
83	assertTrue(a.compareAndSet(this,1,2));
84	assertTrue(a.compareAndSet(this,2,-4));
85	assertEquals(-4,a.get(this));
86	assertFalse(a.compareAndSet(this,-5,7));
87	assertFalse((7 == a.get(this)));
88	assertTrue(a.compareAndSet(this,-4,7));
89	assertEquals(7,a.get(this));
90	}
91
92
93	/**
94	* compareAndSet in one thread enables another waiting for value
95	* to succeed
96	*/
97	public void testCompareAndSetInMultipleThreads() {
98	x = 1;
99	final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest>a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
100
101	Thread t = new Thread(new Runnable() {
102	public void run() {
103	while(!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) Thread.yield();
104	}});
105	try {
106	t.start();
107	assertTrue(a.compareAndSet(this, 1, 2));
108	t.join(LONG_DELAY_MS);
109	assertFalse(t.isAlive());
110	assertEquals(a.get(this), 3);
111	}
112	catch(Exception e) {
113	unexpectedException();
114	}
115	}
116
117	/**
118	* repeated weakCompareAndSet succeeds in changing value when equal
119	* to expected
120	*/
121	public void testWeakCompareAndSet(){
122	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
123	x = 1;
124	while(!a.weakCompareAndSet(this,1,2));
125	while(!a.weakCompareAndSet(this,2,-4));
126	assertEquals(-4,a.get(this));
127	while(!a.weakCompareAndSet(this,-4,7));
128	assertEquals(7,a.get(this));
129	}
130
131	/**
132	* getAndSet returns previous value and sets to given value
133	*/
134	public void testGetAndSet(){
135	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
136	x = 1;
137	assertEquals(1,a.getAndSet(this, 0));
138	assertEquals(0,a.getAndSet(this,-10));
139	assertEquals(-10,a.getAndSet(this,1));
140	}
141
142	/**
143	* getAndAdd returns previous value and adds given value
144	*/
145	public void testGetAndAdd(){
146	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
147	x = 1;
148	assertEquals(1,a.getAndAdd(this,2));
149	assertEquals(3,a.get(this));
150	assertEquals(3,a.getAndAdd(this,-4));
151	assertEquals(-1,a.get(this));
152	}
153
154	/**
155	* getAndDecrement returns previous value and decrements
156	*/
157	public void testGetAndDecrement(){
158	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
159	x = 1;
160	assertEquals(1,a.getAndDecrement(this));
161	assertEquals(0,a.getAndDecrement(this));
162	assertEquals(-1,a.getAndDecrement(this));
163	}
164
165	/**
166	* getAndIncrement returns previous value and increments
167	*/
168	public void testGetAndIncrement(){
169	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
170	x = 1;
171	assertEquals(1,a.getAndIncrement(this));
172	assertEquals(2,a.get(this));
173	a.set(this,-2);
174	assertEquals(-2,a.getAndIncrement(this));
175	assertEquals(-1,a.getAndIncrement(this));
176	assertEquals(0,a.getAndIncrement(this));
177	assertEquals(1,a.get(this));
178	}
179
180	/**
181	* addAndGet adds given value to current, and returns current value
182	*/
183	public void testAddAndGet(){
184	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
185	x = 1;
186	assertEquals(3,a.addAndGet(this,2));
187	assertEquals(3,a.get(this));
188	assertEquals(-1,a.addAndGet(this,-4));
189	assertEquals(-1,a.get(this));
190	}
191
192	/**
193	* decrementAndGet decrements and returns current value
194	*/
195	public void testDecrementAndGet(){
196	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
197	x = 1;
198	assertEquals(0,a.decrementAndGet(this));
199	assertEquals(-1,a.decrementAndGet(this));
200	assertEquals(-2,a.decrementAndGet(this));
201	assertEquals(-2,a.get(this));
202	}
203
204	/**
205	* incrementAndGet increments and returns current value
206	*/
207	public void testIncrementAndGet(){
208	AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = AtomicLongFieldUpdater.newUpdater(AtomicLongFieldUpdaterTest.class, "x");
209	x = 1;
210	assertEquals(2,a.incrementAndGet(this));
211	assertEquals(2,a.get(this));
212	a.set(this,-2);
213	assertEquals(-1,a.incrementAndGet(this));
214	assertEquals(0,a.incrementAndGet(this));
215	assertEquals(1,a.incrementAndGet(this));
216	assertEquals(1,a.get(this));
217	}
218
219	}