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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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import junit.framework.*; |
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import java.util.concurrent.*; |
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import java.util.concurrent.Executors; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.Phaser; |
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import java.util.concurrent.atomic.LongAccumulator; |
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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|
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public class LongAccumulatorTest 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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main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(LongAccumulatorTest.class); |
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} |
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/** |
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* default constructed initializes to zero |
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* new instance initialized to supplied identity |
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*/ |
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public void testConstructor() { |
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LongAccumulator ai = new LongAccumulator(Long::max, 0L); |
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assertEquals(0, ai.get()); |
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for (long identity : new long[] { Long.MIN_VALUE, 0, Long.MAX_VALUE }) |
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assertEquals(identity, |
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new LongAccumulator(Long::max, identity).get()); |
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} |
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|
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/** |
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* accumulate accumulates given value to current, and get returns current value |
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*/ |
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public void testAccumulateAndGet() { |
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LongAccumulator ai = new LongAccumulator(Long::max, 0L); |
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ai.accumulate(2); |
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assertEquals(2, ai.get()); |
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ai.accumulate(-4); |
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assertEquals(2, ai.get()); |
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ai.accumulate(4); |
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assertEquals(4, ai.get()); |
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LongAccumulator acc = new LongAccumulator(Long::max, 0L); |
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acc.accumulate(2); |
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assertEquals(2, acc.get()); |
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acc.accumulate(-4); |
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assertEquals(2, acc.get()); |
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acc.accumulate(4); |
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assertEquals(4, acc.get()); |
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} |
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|
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/** |
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* reset zeroes get |
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* reset() causes subsequent get() to return zero |
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*/ |
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public void testReset() { |
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LongAccumulator ai = new LongAccumulator(Long::max, 0L); |
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ai.accumulate(2); |
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assertEquals(2, ai.get()); |
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ai.reset(); |
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assertEquals(0, ai.get()); |
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LongAccumulator acc = new LongAccumulator(Long::max, 0L); |
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acc.accumulate(2); |
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assertEquals(2, acc.get()); |
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acc.reset(); |
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assertEquals(0, acc.get()); |
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} |
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|
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/** |
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* getThenReset returns get then zeros |
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* getThenReset() returns current value; subsequent get() returns zero |
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*/ |
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public void testGetThenReset() { |
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LongAccumulator ai = new LongAccumulator(Long::max, 0L); |
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ai.accumulate(2); |
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assertEquals(2, ai.get()); |
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assertEquals(2, ai.getThenReset()); |
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assertEquals(0, ai.get()); |
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LongAccumulator acc = new LongAccumulator(Long::max, 0L); |
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acc.accumulate(2); |
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assertEquals(2, acc.get()); |
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assertEquals(2, acc.getThenReset()); |
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assertEquals(0, acc.get()); |
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} |
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|
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/** |
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* toString returns current value. |
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*/ |
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public void testToString() { |
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LongAccumulator ai = new LongAccumulator(Long::max, 0L); |
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assertEquals("0", ai.toString()); |
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ai.accumulate(1); |
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assertEquals(Long.toString(1), ai.toString()); |
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LongAccumulator acc = new LongAccumulator(Long::max, 0L); |
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assertEquals("0", acc.toString()); |
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acc.accumulate(1); |
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assertEquals(Long.toString(1), acc.toString()); |
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} |
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|
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/** |
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* intValue returns current value. |
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*/ |
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public void testIntValue() { |
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LongAccumulator ai = new LongAccumulator(Long::max, 0L); |
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assertEquals(0, ai.intValue()); |
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ai.accumulate(1); |
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assertEquals(1, ai.intValue()); |
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LongAccumulator acc = new LongAccumulator(Long::max, 0L); |
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assertEquals(0, acc.intValue()); |
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acc.accumulate(1); |
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assertEquals(1, acc.intValue()); |
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} |
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|
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/** |
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* longValue returns current value. |
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*/ |
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public void testLongValue() { |
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LongAccumulator ai = new LongAccumulator(Long::max, 0L); |
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assertEquals(0, ai.longValue()); |
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ai.accumulate(1); |
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assertEquals(1, ai.longValue()); |
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LongAccumulator acc = new LongAccumulator(Long::max, 0L); |
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assertEquals(0, acc.longValue()); |
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acc.accumulate(1); |
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assertEquals(1, acc.longValue()); |
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} |
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|
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/** |
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* floatValue returns current value. |
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*/ |
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public void testFloatValue() { |
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LongAccumulator ai = new LongAccumulator(Long::max, 0L); |
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assertEquals(0.0f, ai.floatValue()); |
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ai.accumulate(1); |
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assertEquals(1.0f, ai.floatValue()); |
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LongAccumulator acc = new LongAccumulator(Long::max, 0L); |
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assertEquals(0.0f, acc.floatValue()); |
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acc.accumulate(1); |
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assertEquals(1.0f, acc.floatValue()); |
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} |
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/** |
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* doubleValue returns current value. |
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*/ |
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public void testDoubleValue() { |
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LongAccumulator ai = new LongAccumulator(Long::max, 0L); |
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assertEquals(0.0, ai.doubleValue()); |
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ai.accumulate(1); |
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assertEquals(1.0, ai.doubleValue()); |
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LongAccumulator acc = new LongAccumulator(Long::max, 0L); |
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assertEquals(0.0, acc.doubleValue()); |
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acc.accumulate(1); |
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assertEquals(1.0, acc.doubleValue()); |
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} |
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/** |
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pool.shutdown(); |
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} |
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|
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static final class AccTask implements Runnable { |
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static final class AccTask implements Runnable { |
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final LongAccumulator acc; |
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final Phaser phaser; |
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final int incs; |
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volatile long result; |
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AccTask(LongAccumulator acc, Phaser phaser, int incs) { |
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this.acc = acc; |
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AccTask(LongAccumulator acc, Phaser phaser, int incs) { |
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this.acc = acc; |
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this.phaser = phaser; |
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this.incs = incs; |
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} |