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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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import junit.framework.*; |
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import java.util.concurrent.atomic.*; |
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import java.io.*; |
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import java.util.concurrent.atomic.AtomicReference; |
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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public class AtomicReferenceTest extends JSR166TestCase { |
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public static void main (String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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public static void main(String[] args) { |
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main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(AtomicReferenceTest.class); |
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*/ |
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public void testConstructor() { |
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AtomicReference ai = new AtomicReference(one); |
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assertSame(one,ai.get()); |
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assertSame(one, ai.get()); |
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} |
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/** |
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*/ |
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public void testGetSet() { |
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AtomicReference ai = new AtomicReference(one); |
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assertSame(one,ai.get()); |
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assertSame(one, ai.get()); |
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ai.set(two); |
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assertSame(two,ai.get()); |
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assertSame(two, ai.get()); |
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ai.set(m3); |
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assertSame(m3,ai.get()); |
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assertSame(m3, ai.get()); |
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} |
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/** |
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*/ |
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public void testGetLazySet() { |
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AtomicReference ai = new AtomicReference(one); |
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assertSame(one,ai.get()); |
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assertSame(one, ai.get()); |
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ai.lazySet(two); |
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assertSame(two,ai.get()); |
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assertSame(two, ai.get()); |
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ai.lazySet(m3); |
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assertSame(m3,ai.get()); |
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assertSame(m3, ai.get()); |
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} |
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/** |
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*/ |
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public void testCompareAndSet() { |
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AtomicReference ai = new AtomicReference(one); |
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assertTrue(ai.compareAndSet(one,two)); |
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assertTrue(ai.compareAndSet(two,m4)); |
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assertSame(m4,ai.get()); |
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assertFalse(ai.compareAndSet(m5,seven)); |
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assertSame(m4,ai.get()); |
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assertTrue(ai.compareAndSet(m4,seven)); |
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assertSame(seven,ai.get()); |
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assertTrue(ai.compareAndSet(one, two)); |
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assertTrue(ai.compareAndSet(two, m4)); |
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assertSame(m4, ai.get()); |
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assertFalse(ai.compareAndSet(m5, seven)); |
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assertSame(m4, ai.get()); |
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assertTrue(ai.compareAndSet(m4, seven)); |
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assertSame(seven, ai.get()); |
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} |
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/** |
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assertTrue(ai.compareAndSet(one, two)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertSame(ai.get(), three); |
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assertSame(three, ai.get()); |
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} |
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/** |
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*/ |
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public void testWeakCompareAndSet() { |
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AtomicReference ai = new AtomicReference(one); |
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while (!ai.weakCompareAndSet(one,two)); |
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while (!ai.weakCompareAndSet(two,m4)); |
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assertSame(m4,ai.get()); |
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while (!ai.weakCompareAndSet(m4,seven)); |
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assertSame(seven,ai.get()); |
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do {} while (!ai.weakCompareAndSet(one, two)); |
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do {} while (!ai.weakCompareAndSet(two, m4)); |
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assertSame(m4, ai.get()); |
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do {} while (!ai.weakCompareAndSet(m4, seven)); |
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assertSame(seven, ai.get()); |
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} |
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/** |
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*/ |
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public void testGetAndSet() { |
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AtomicReference ai = new AtomicReference(one); |
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assertSame(one,ai.getAndSet(zero)); |
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assertSame(zero,ai.getAndSet(m10)); |
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assertSame(m10,ai.getAndSet(one)); |
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assertSame(one, ai.getAndSet(zero)); |
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assertSame(zero, ai.getAndSet(m10)); |
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assertSame(m10, ai.getAndSet(one)); |
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} |
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/** |
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* a deserialized serialized atomic holds same value |
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*/ |
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public void testSerialization() throws Exception { |
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AtomicReference l = new AtomicReference(); |
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l.set(one); |
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ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
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ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
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out.writeObject(l); |
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out.close(); |
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ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
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ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
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AtomicReference r = (AtomicReference) in.readObject(); |
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assertEquals(l.get(), r.get()); |
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AtomicReference x = new AtomicReference(); |
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AtomicReference y = serialClone(x); |
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assertNotSame(x, y); |
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x.set(one); |
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AtomicReference z = serialClone(x); |
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assertNotSame(y, z); |
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assertEquals(one, x.get()); |
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assertEquals(null, y.get()); |
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assertEquals(one, z.get()); |
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} |
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/** |
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*/ |
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public void testToString() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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assertEquals(ai.toString(), one.toString()); |
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assertEquals(one.toString(), ai.toString()); |
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ai.set(two); |
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assertEquals(two.toString(), ai.toString()); |
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} |
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|
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// jdk9 |
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|
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/** |
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* getPlain returns the last value set |
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*/ |
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public void testGetPlainSet() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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assertEquals(one, ai.getPlain()); |
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ai.set(two); |
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assertEquals(ai.toString(), two.toString()); |
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assertEquals(two, ai.getPlain()); |
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ai.set(m3); |
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assertEquals(m3, ai.getPlain()); |
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} |
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|
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/** |
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* getOpaque returns the last value set |
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*/ |
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public void testGetOpaqueSet() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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assertEquals(one, ai.getOpaque()); |
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ai.set(two); |
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assertEquals(two, ai.getOpaque()); |
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ai.set(m3); |
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assertEquals(m3, ai.getOpaque()); |
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} |
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|
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/** |
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* getAcquire returns the last value set |
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*/ |
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public void testGetAcquireSet() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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assertEquals(one, ai.getAcquire()); |
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ai.set(two); |
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assertEquals(two, ai.getAcquire()); |
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ai.set(m3); |
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assertEquals(m3, ai.getAcquire()); |
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} |
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|
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/** |
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* get returns the last value setPlain |
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*/ |
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public void testGetSetPlain() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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assertEquals(one, ai.get()); |
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ai.setPlain(two); |
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assertEquals(two, ai.get()); |
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ai.setPlain(m3); |
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assertEquals(m3, ai.get()); |
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} |
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|
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/** |
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* get returns the last value setOpaque |
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*/ |
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public void testGetSetOpaque() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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assertEquals(one, ai.get()); |
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ai.setOpaque(two); |
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assertEquals(two, ai.get()); |
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ai.setOpaque(m3); |
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assertEquals(m3, ai.get()); |
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} |
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|
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/** |
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* get returns the last value setRelease |
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*/ |
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public void testGetSetRelease() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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assertEquals(one, ai.get()); |
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ai.setRelease(two); |
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assertEquals(two, ai.get()); |
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ai.setRelease(m3); |
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assertEquals(m3, ai.get()); |
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} |
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|
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/** |
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* compareAndExchange succeeds in changing value if equal to |
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* expected else fails |
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*/ |
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public void testCompareAndExchange() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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assertEquals(one, ai.compareAndExchange(one, two)); |
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assertEquals(two, ai.compareAndExchange(two, m4)); |
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assertEquals(m4, ai.get()); |
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assertEquals(m4, ai.compareAndExchange(m5, seven)); |
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assertEquals(m4, ai.get()); |
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assertEquals(m4, ai.compareAndExchange(m4, seven)); |
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assertEquals(seven, ai.get()); |
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} |
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|
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/** |
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* compareAndExchangeAcquire succeeds in changing value if equal to |
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* expected else fails |
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*/ |
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public void testCompareAndExchangeAcquire() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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assertEquals(one, ai.compareAndExchangeAcquire(one, two)); |
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assertEquals(two, ai.compareAndExchangeAcquire(two, m4)); |
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assertEquals(m4, ai.get()); |
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assertEquals(m4, ai.compareAndExchangeAcquire(m5, seven)); |
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assertEquals(m4, ai.get()); |
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assertEquals(m4, ai.compareAndExchangeAcquire(m4, seven)); |
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assertEquals(seven, ai.get()); |
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} |
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|
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/** |
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* compareAndExchangeRelease succeeds in changing value if equal to |
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* expected else fails |
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*/ |
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public void testCompareAndExchangeRelease() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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assertEquals(one, ai.compareAndExchangeRelease(one, two)); |
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assertEquals(two, ai.compareAndExchangeRelease(two, m4)); |
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assertEquals(m4, ai.get()); |
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assertEquals(m4, ai.compareAndExchangeRelease(m5, seven)); |
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assertEquals(m4, ai.get()); |
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assertEquals(m4, ai.compareAndExchangeRelease(m4, seven)); |
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assertEquals(seven, ai.get()); |
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} |
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|
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/** |
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* repeated weakCompareAndSetVolatile succeeds in changing value when equal |
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* to expected |
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*/ |
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public void testWeakCompareAndSetVolatile() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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do {} while (!ai.weakCompareAndSetVolatile(one, two)); |
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do {} while (!ai.weakCompareAndSetVolatile(two, m4)); |
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assertEquals(m4, ai.get()); |
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do {} while (!ai.weakCompareAndSetVolatile(m4, seven)); |
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assertEquals(seven, ai.get()); |
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} |
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|
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/** |
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* repeated weakCompareAndSetAcquire succeeds in changing value when equal |
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* to expected |
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*/ |
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public void testWeakCompareAndSetAcquire() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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do {} while (!ai.weakCompareAndSetAcquire(one, two)); |
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do {} while (!ai.weakCompareAndSetAcquire(two, m4)); |
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assertEquals(m4, ai.get()); |
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do {} while (!ai.weakCompareAndSetAcquire(m4, seven)); |
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assertEquals(seven, ai.get()); |
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} |
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|
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/** |
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* repeated weakCompareAndSetRelease succeeds in changing value when equal |
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* to expected |
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*/ |
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public void testWeakCompareAndSetRelease() { |
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AtomicReference<Integer> ai = new AtomicReference<Integer>(one); |
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do {} while (!ai.weakCompareAndSetRelease(one, two)); |
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do {} while (!ai.weakCompareAndSetRelease(two, m4)); |
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assertEquals(m4, ai.get()); |
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do {} while (!ai.weakCompareAndSetRelease(m4, seven)); |
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assertEquals(seven, ai.get()); |
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} |
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} |
