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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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junit.textui.TestRunner.run(suite()); |
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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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* constructor initializes to given value |
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*/ |
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public void testConstructor(){ |
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public void testConstructor() { |
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AtomicReference ai = new AtomicReference(one); |
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assertEquals(one,ai.get()); |
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assertSame(one, ai.get()); |
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} |
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/** |
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* default constructed initializes to null |
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*/ |
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public void testConstructor2(){ |
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public void testConstructor2() { |
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AtomicReference ai = new AtomicReference(); |
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assertNull(ai.get()); |
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assertNull(ai.get()); |
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} |
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/** |
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* get returns the last value set |
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*/ |
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public void testGetSet(){ |
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public void testGetSet() { |
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AtomicReference ai = new AtomicReference(one); |
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assertEquals(one,ai.get()); |
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ai.set(two); |
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assertEquals(two,ai.get()); |
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ai.set(m3); |
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assertEquals(m3,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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ai.set(m3); |
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assertSame(m3, ai.get()); |
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} |
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/** |
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* get returns the last value lazySet in same thread |
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*/ |
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public void testGetLazySet(){ |
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public void testGetLazySet() { |
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AtomicReference ai = new AtomicReference(one); |
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assertEquals(one,ai.get()); |
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ai.lazySet(two); |
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assertEquals(two,ai.get()); |
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ai.lazySet(m3); |
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assertEquals(m3,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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ai.lazySet(m3); |
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assertSame(m3, ai.get()); |
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} |
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/** |
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* compareAndSet succeeds in changing value if equal to expected else fails |
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*/ |
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public void testCompareAndSet(){ |
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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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assertEquals(m4,ai.get()); |
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assertFalse(ai.compareAndSet(m5,seven)); |
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assertFalse((seven.equals(ai.get()))); |
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assertTrue(ai.compareAndSet(m4,seven)); |
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assertEquals(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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* compareAndSet in one thread enables another waiting for value |
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* to succeed |
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*/ |
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public void testCompareAndSetInMultipleThreads() { |
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public void testCompareAndSetInMultipleThreads() throws Exception { |
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final AtomicReference ai = new AtomicReference(one); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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while(!ai.compareAndSet(two, three)) Thread.yield(); |
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}}); |
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try { |
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t.start(); |
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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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assertEquals(ai.get(), three); |
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} |
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catch(Exception e) { |
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unexpectedException(); |
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} |
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Thread t = new Thread(new CheckedRunnable() { |
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public void realRun() { |
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while (!ai.compareAndSet(two, three)) |
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Thread.yield(); |
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}}); |
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t.start(); |
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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(three, ai.get()); |
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} |
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/** |
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* repeated weakCompareAndSet succeeds in changing value when equal |
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* to expected |
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*/ |
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public void testWeakCompareAndSet(){ |
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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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assertEquals(m4,ai.get()); |
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while(!ai.weakCompareAndSet(m4,seven)); |
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assertEquals(seven,ai.get()); |
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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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} |
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/** |
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* getAndSet returns previous value and sets to given value |
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*/ |
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public void testGetAndSet(){ |
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public void testGetAndSet() { |
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AtomicReference ai = new AtomicReference(one); |
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assertEquals(one,ai.getAndSet(zero)); |
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assertEquals(zero,ai.getAndSet(m10)); |
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assertEquals(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() { |
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AtomicReference l = new AtomicReference(); |
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try { |
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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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} catch(Exception e){ |
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unexpectedException(); |
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} |
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public void testSerialization() throws Exception { |
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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(ai.toString(), two.toString()); |
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assertEquals(two.toString(), ai.toString()); |
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} |
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} |
