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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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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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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.*; |
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import java.util.Arrays; |
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import java.util.concurrent.atomic.AtomicLongArray; |
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|
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public class AtomicLongArrayTest 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(AtomicLongArrayTest.class); |
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/** |
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* constructor creates array of given size with all elements zero |
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*/ |
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public void testConstructor(){ |
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public void testConstructor() { |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) |
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assertEquals(0,ai.get(i)); |
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for (int i = 0; i < SIZE; ++i) |
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assertEquals(0, ai.get(i)); |
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} |
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|
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/** |
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try { |
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long[] a = null; |
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AtomicLongArray ai = new AtomicLongArray(a); |
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} catch (NullPointerException success) { |
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} catch (Exception ex) { |
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unexpectedException(); |
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} |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* constructor with array is of same size and has all elements |
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*/ |
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public void testConstructor2() { |
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long[] a = { 17L, 3L, -42L, 99L, -7L}; |
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long[] a = { 17L, 3L, -42L, 99L, -7L }; |
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AtomicLongArray ai = new AtomicLongArray(a); |
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assertEquals(a.length, ai.length()); |
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for (int i = 0; i < a.length; ++i) |
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for (int i = 0; i < a.length; ++i) |
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assertEquals(a[i], ai.get(i)); |
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} |
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|
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/** |
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* get and set for out of bound indices throw IndexOutOfBoundsException |
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*/ |
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public void testIndexing(){ |
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public void testIndexing() { |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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try { |
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ai.get(SIZE); |
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} catch(IndexOutOfBoundsException success){ |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) { |
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} |
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try { |
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ai.get(-1); |
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} catch(IndexOutOfBoundsException success){ |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) { |
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} |
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try { |
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ai.set(SIZE, 0); |
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} catch(IndexOutOfBoundsException success){ |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) { |
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} |
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try { |
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ai.set(-1, 0); |
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} catch(IndexOutOfBoundsException success){ |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) { |
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} |
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} |
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|
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/** |
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* get returns the last value set at index |
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*/ |
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public void testGetSet(){ |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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public void testGetSet() { |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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ai.set(i, 1); |
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assertEquals(1,ai.get(i)); |
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assertEquals(1, ai.get(i)); |
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ai.set(i, 2); |
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assertEquals(2,ai.get(i)); |
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assertEquals(2, ai.get(i)); |
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ai.set(i, -3); |
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assertEquals(-3,ai.get(i)); |
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assertEquals(-3, ai.get(i)); |
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} |
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} |
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|
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/** |
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* get returns the last value lazySet at index by same thread |
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*/ |
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public void testGetLazySet(){ |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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public void testGetLazySet() { |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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ai.lazySet(i, 1); |
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assertEquals(1,ai.get(i)); |
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assertEquals(1, ai.get(i)); |
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ai.lazySet(i, 2); |
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assertEquals(2,ai.get(i)); |
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assertEquals(2, ai.get(i)); |
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ai.lazySet(i, -3); |
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assertEquals(-3,ai.get(i)); |
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assertEquals(-3, ai.get(i)); |
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} |
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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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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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public void testCompareAndSet() { |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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ai.set(i, 1); |
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assertTrue(ai.compareAndSet(i, 1,2)); |
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assertTrue(ai.compareAndSet(i, 2,-4)); |
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assertEquals(-4,ai.get(i)); |
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assertFalse(ai.compareAndSet(i, -5,7)); |
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assertFalse((7 == ai.get(i))); |
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assertTrue(ai.compareAndSet(i, -4,7)); |
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assertEquals(7,ai.get(i)); |
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assertTrue(ai.compareAndSet(i, 1, 2)); |
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assertTrue(ai.compareAndSet(i, 2, -4)); |
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assertEquals(-4, ai.get(i)); |
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assertFalse(ai.compareAndSet(i, -5, 7)); |
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assertEquals(-4, ai.get(i)); |
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assertTrue(ai.compareAndSet(i, -4, 7)); |
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assertEquals(7, ai.get(i)); |
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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 InterruptedException { |
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final AtomicLongArray a = new AtomicLongArray(1); |
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a.set(0, 1); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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while(!a.compareAndSet(0, 2, 3)) Thread.yield(); |
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}}); |
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try { |
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t.start(); |
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assertTrue(a.compareAndSet(0, 1, 2)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertEquals(a.get(0), 3); |
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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 (!a.compareAndSet(0, 2, 3)) |
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Thread.yield(); |
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}}); |
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|
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t.start(); |
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assertTrue(a.compareAndSet(0, 1, 2)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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assertEquals(a.get(0), 3); |
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} |
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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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> |
* to expected |
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*/ |
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< |
public void testWeakCompareAndSet(){ |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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> |
public void testWeakCompareAndSet() { |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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ai.set(i, 1); |
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while(!ai.weakCompareAndSet(i, 1,2)); |
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while(!ai.weakCompareAndSet(i, 2,-4)); |
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assertEquals(-4,ai.get(i)); |
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while(!ai.weakCompareAndSet(i, -4,7)); |
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assertEquals(7,ai.get(i)); |
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while (!ai.weakCompareAndSet(i, 1, 2)); |
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while (!ai.weakCompareAndSet(i, 2, -4)); |
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assertEquals(-4, ai.get(i)); |
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while (!ai.weakCompareAndSet(i, -4, 7)); |
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> |
assertEquals(7, ai.get(i)); |
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} |
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} |
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|
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/** |
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* getAndSet returns previous value and sets to given value at given index |
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* getAndSet returns previous value and sets to given value at given index |
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*/ |
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public void testGetAndSet(){ |
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AtomicLongArray ai = new AtomicLongArray(SIZE); |
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> |
public void testGetAndSet() { |
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> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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ai.set(i, 1); |
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assertEquals(1,ai.getAndSet(i,0)); |
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assertEquals(0,ai.getAndSet(i,-10)); |
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assertEquals(-10,ai.getAndSet(i,1)); |
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> |
assertEquals(1, ai.getAndSet(i, 0)); |
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assertEquals(0, ai.getAndSet(i, -10)); |
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assertEquals(-10, ai.getAndSet(i, 1)); |
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} |
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} |
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|
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/** |
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* getAndAdd returns previous value and adds given value |
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> |
* getAndAdd returns previous value and adds given value |
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*/ |
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< |
public void testGetAndAdd(){ |
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< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
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> |
public void testGetAndAdd() { |
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> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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ai.set(i, 1); |
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< |
assertEquals(1,ai.getAndAdd(i,2)); |
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< |
assertEquals(3,ai.get(i)); |
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< |
assertEquals(3,ai.getAndAdd(i,-4)); |
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< |
assertEquals(-1,ai.get(i)); |
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> |
assertEquals(1, ai.getAndAdd(i, 2)); |
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> |
assertEquals(3, ai.get(i)); |
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> |
assertEquals(3, ai.getAndAdd(i, -4)); |
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> |
assertEquals(-1, ai.get(i)); |
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} |
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} |
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|
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/** |
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* getAndDecrement returns previous value and decrements |
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*/ |
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< |
public void testGetAndDecrement(){ |
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< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
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> |
public void testGetAndDecrement() { |
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> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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ai.set(i, 1); |
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< |
assertEquals(1,ai.getAndDecrement(i)); |
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< |
assertEquals(0,ai.getAndDecrement(i)); |
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< |
assertEquals(-1,ai.getAndDecrement(i)); |
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> |
assertEquals(1, ai.getAndDecrement(i)); |
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> |
assertEquals(0, ai.getAndDecrement(i)); |
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> |
assertEquals(-1, ai.getAndDecrement(i)); |
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} |
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} |
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|
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/** |
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* getAndIncrement returns previous value and increments |
| 204 |
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*/ |
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< |
public void testGetAndIncrement(){ |
| 206 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
| 205 |
> |
public void testGetAndIncrement() { |
| 206 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
| 207 |
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for (int i = 0; i < SIZE; ++i) { |
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ai.set(i, 1); |
| 209 |
< |
assertEquals(1,ai.getAndIncrement(i)); |
| 210 |
< |
assertEquals(2,ai.get(i)); |
| 211 |
< |
ai.set(i,-2); |
| 212 |
< |
assertEquals(-2,ai.getAndIncrement(i)); |
| 213 |
< |
assertEquals(-1,ai.getAndIncrement(i)); |
| 214 |
< |
assertEquals(0,ai.getAndIncrement(i)); |
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< |
assertEquals(1,ai.get(i)); |
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> |
assertEquals(1, ai.getAndIncrement(i)); |
| 210 |
> |
assertEquals(2, ai.get(i)); |
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> |
ai.set(i, -2); |
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> |
assertEquals(-2, ai.getAndIncrement(i)); |
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> |
assertEquals(-1, ai.getAndIncrement(i)); |
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> |
assertEquals(0, ai.getAndIncrement(i)); |
| 215 |
> |
assertEquals(1, ai.get(i)); |
| 216 |
|
} |
| 217 |
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} |
| 218 |
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|
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|
/** |
| 220 |
< |
* addAndGet adds given value to current, and returns current value |
| 220 |
> |
* addAndGet adds given value to current, and returns current value |
| 221 |
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*/ |
| 222 |
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public void testAddAndGet() { |
| 223 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
| 223 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
| 224 |
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for (int i = 0; i < SIZE; ++i) { |
| 225 |
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ai.set(i, 1); |
| 226 |
< |
assertEquals(3,ai.addAndGet(i,2)); |
| 227 |
< |
assertEquals(3,ai.get(i)); |
| 228 |
< |
assertEquals(-1,ai.addAndGet(i,-4)); |
| 229 |
< |
assertEquals(-1,ai.get(i)); |
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> |
assertEquals(3, ai.addAndGet(i, 2)); |
| 227 |
> |
assertEquals(3, ai.get(i)); |
| 228 |
> |
assertEquals(-1, ai.addAndGet(i, -4)); |
| 229 |
> |
assertEquals(-1, ai.get(i)); |
| 230 |
|
} |
| 231 |
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} |
| 232 |
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|
| 233 |
|
/** |
| 234 |
|
* decrementAndGet decrements and returns current value |
| 235 |
|
*/ |
| 236 |
< |
public void testDecrementAndGet(){ |
| 237 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
| 236 |
> |
public void testDecrementAndGet() { |
| 237 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
| 238 |
|
for (int i = 0; i < SIZE; ++i) { |
| 239 |
|
ai.set(i, 1); |
| 240 |
< |
assertEquals(0,ai.decrementAndGet(i)); |
| 241 |
< |
assertEquals(-1,ai.decrementAndGet(i)); |
| 242 |
< |
assertEquals(-2,ai.decrementAndGet(i)); |
| 243 |
< |
assertEquals(-2,ai.get(i)); |
| 240 |
> |
assertEquals(0, ai.decrementAndGet(i)); |
| 241 |
> |
assertEquals(-1, ai.decrementAndGet(i)); |
| 242 |
> |
assertEquals(-2, ai.decrementAndGet(i)); |
| 243 |
> |
assertEquals(-2, ai.get(i)); |
| 244 |
|
} |
| 245 |
|
} |
| 246 |
|
|
| 248 |
|
* incrementAndGet increments and returns current value |
| 249 |
|
*/ |
| 250 |
|
public void testIncrementAndGet() { |
| 251 |
< |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
| 251 |
> |
AtomicLongArray ai = new AtomicLongArray(SIZE); |
| 252 |
|
for (int i = 0; i < SIZE; ++i) { |
| 253 |
|
ai.set(i, 1); |
| 254 |
< |
assertEquals(2,ai.incrementAndGet(i)); |
| 255 |
< |
assertEquals(2,ai.get(i)); |
| 254 |
> |
assertEquals(2, ai.incrementAndGet(i)); |
| 255 |
> |
assertEquals(2, ai.get(i)); |
| 256 |
|
ai.set(i, -2); |
| 257 |
< |
assertEquals(-1,ai.incrementAndGet(i)); |
| 258 |
< |
assertEquals(0,ai.incrementAndGet(i)); |
| 259 |
< |
assertEquals(1,ai.incrementAndGet(i)); |
| 260 |
< |
assertEquals(1,ai.get(i)); |
| 257 |
> |
assertEquals(-1, ai.incrementAndGet(i)); |
| 258 |
> |
assertEquals(0, ai.incrementAndGet(i)); |
| 259 |
> |
assertEquals(1, ai.incrementAndGet(i)); |
| 260 |
> |
assertEquals(1, ai.get(i)); |
| 261 |
|
} |
| 262 |
|
} |
| 263 |
|
|
| 264 |
|
static final long COUNTDOWN = 100000; |
| 265 |
< |
|
| 266 |
< |
class Counter implements Runnable { |
| 265 |
> |
|
| 266 |
> |
class Counter extends CheckedRunnable { |
| 267 |
|
final AtomicLongArray ai; |
| 268 |
|
volatile long counts; |
| 269 |
|
Counter(AtomicLongArray a) { ai = a; } |
| 270 |
< |
public void run() { |
| 270 |
> |
public void realRun() { |
| 271 |
|
for (;;) { |
| 272 |
|
boolean done = true; |
| 273 |
|
for (int i = 0; i < ai.length(); ++i) { |
| 274 |
|
long v = ai.get(i); |
| 275 |
< |
threadAssertTrue(v >= 0); |
| 275 |
> |
assertTrue(v >= 0); |
| 276 |
|
if (v != 0) { |
| 277 |
|
done = false; |
| 278 |
|
if (ai.compareAndSet(i, v, v-1)) |
| 289 |
|
* Multiple threads using same array of counters successfully |
| 290 |
|
* update a number of times equal to total count |
| 291 |
|
*/ |
| 292 |
< |
public void testCountingInMultipleThreads() { |
| 293 |
< |
try { |
| 294 |
< |
final AtomicLongArray ai = new AtomicLongArray(SIZE); |
| 295 |
< |
for (int i = 0; i < SIZE; ++i) |
| 296 |
< |
ai.set(i, COUNTDOWN); |
| 297 |
< |
Counter c1 = new Counter(ai); |
| 298 |
< |
Counter c2 = new Counter(ai); |
| 299 |
< |
Thread t1 = new Thread(c1); |
| 300 |
< |
Thread t2 = new Thread(c2); |
| 301 |
< |
t1.start(); |
| 302 |
< |
t2.start(); |
| 303 |
< |
t1.join(); |
| 304 |
< |
t2.join(); |
| 307 |
< |
assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN); |
| 308 |
< |
} |
| 309 |
< |
catch(InterruptedException ie) { |
| 310 |
< |
unexpectedException(); |
| 311 |
< |
} |
| 292 |
> |
public void testCountingInMultipleThreads() throws InterruptedException { |
| 293 |
> |
final AtomicLongArray ai = new AtomicLongArray(SIZE); |
| 294 |
> |
for (int i = 0; i < SIZE; ++i) |
| 295 |
> |
ai.set(i, COUNTDOWN); |
| 296 |
> |
Counter c1 = new Counter(ai); |
| 297 |
> |
Counter c2 = new Counter(ai); |
| 298 |
> |
Thread t1 = new Thread(c1); |
| 299 |
> |
Thread t2 = new Thread(c2); |
| 300 |
> |
t1.start(); |
| 301 |
> |
t2.start(); |
| 302 |
> |
t1.join(); |
| 303 |
> |
t2.join(); |
| 304 |
> |
assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN); |
| 305 |
|
} |
| 306 |
|
|
| 307 |
|
/** |
| 308 |
|
* a deserialized serialized array holds same values |
| 309 |
|
*/ |
| 310 |
< |
public void testSerialization() { |
| 311 |
< |
AtomicLongArray l = new AtomicLongArray(SIZE); |
| 312 |
< |
for (int i = 0; i < SIZE; ++i) |
| 313 |
< |
l.set(i, -i); |
| 314 |
< |
|
| 315 |
< |
try { |
| 316 |
< |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
| 317 |
< |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
| 318 |
< |
out.writeObject(l); |
| 326 |
< |
out.close(); |
| 327 |
< |
|
| 328 |
< |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
| 329 |
< |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
| 330 |
< |
AtomicLongArray r = (AtomicLongArray) in.readObject(); |
| 331 |
< |
for (int i = 0; i < SIZE; ++i) { |
| 332 |
< |
assertEquals(l.get(i), r.get(i)); |
| 333 |
< |
} |
| 334 |
< |
} catch(Exception e){ |
| 335 |
< |
unexpectedException(); |
| 310 |
> |
public void testSerialization() throws Exception { |
| 311 |
> |
AtomicLongArray x = new AtomicLongArray(SIZE); |
| 312 |
> |
for (int i = 0; i < SIZE; ++i) |
| 313 |
> |
x.set(i, -i); |
| 314 |
> |
AtomicLongArray y = serialClone(x); |
| 315 |
> |
assertTrue(x != y); |
| 316 |
> |
assertEquals(x.length(), y.length()); |
| 317 |
> |
for (int i = 0; i < SIZE; ++i) { |
| 318 |
> |
assertEquals(x.get(i), y.get(i)); |
| 319 |
|
} |
| 320 |
|
} |
| 321 |
|
|
| 322 |
|
/** |
| 323 |
|
* toString returns current value. |
| 324 |
< |
*/ |
| 324 |
> |
*/ |
| 325 |
|
public void testToString() { |
| 326 |
< |
long[] a = { 17, 3, -42, 99, -7}; |
| 326 |
> |
long[] a = { 17, 3, -42, 99, -7 }; |
| 327 |
|
AtomicLongArray ai = new AtomicLongArray(a); |
| 328 |
|
assertEquals(Arrays.toString(a), ai.toString()); |
| 329 |
|
} |
| 330 |
|
|
| 348 |
– |
|
| 331 |
|
} |
