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dl |
1.1 |
/* |
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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 John Vint |
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*/ |
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.concurrent.atomic.AtomicInteger; |
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import java.util.concurrent.*; |
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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public class PhaserTest 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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} |
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public static Test suite() { |
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return new TestSuite(PhaserTest.class); |
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} |
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/** |
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* Empty constructor builds a new Phaser with no parent, no registered |
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* parties and initial phase number of 0 |
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*/ |
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public void testConstructor1() { |
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Phaser phaser = new Phaser(); |
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assertNull(phaser.getParent()); |
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assertEquals(0, phaser.getArrivedParties()); |
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assertEquals(0, phaser.getPhase()); |
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} |
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/** |
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* A negative party number for the constructor throws illegal argument |
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* exception |
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*/ |
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public void testConstructor2() { |
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try { |
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new Phaser(-1); |
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this.shouldThrow(); |
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} catch (IllegalArgumentException success) { |
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} |
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} |
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/** |
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* The parent being input into the constructor should equal the original |
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* parent when being returned |
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*/ |
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public void testConstructor3() { |
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Phaser parent = new Phaser(); |
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assertEquals(parent, new Phaser(parent).getParent()); |
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} |
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/** |
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* A negative party number for the constructor throws illegal argument |
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* exception |
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*/ |
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public void testConstructor4() { |
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try { |
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new Phaser(new Phaser(), -1); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) { |
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} |
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} |
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/** |
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* The parent being input into the parameter should equal the original |
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* parent when being returned |
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*/ |
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public void testConstructor5() { |
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Phaser parent = new Phaser(); |
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assertEquals(parent, new Phaser(parent, 0).getParent()); |
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} |
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/** |
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* register() will increment the number of unarrived parties by one and not |
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* affect its arrived parties |
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*/ |
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public void testRegister1() { |
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Phaser phaser = new Phaser(); |
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assertEquals(0, phaser.getUnarrivedParties()); |
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phaser.register(); |
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assertEquals(1, phaser.getUnarrivedParties()); |
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assertEquals(0, phaser.getArrivedParties()); |
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} |
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/** |
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* Registering any more then 65536 parties causes IllegalStateExceptiom |
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*/ |
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public void testRegister2() { |
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Phaser phaser = new Phaser(0); |
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int expectedUnnarivedParties = (1 << 16) - 1; |
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for (int i = 0; i < expectedUnnarivedParties; i++) { |
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phaser.register(); |
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assertEquals(i + 1, phaser.getUnarrivedParties()); |
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} |
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try { |
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phaser.register(); |
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shouldThrow(); |
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} catch (IllegalStateException success) { |
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} catch (Exception ex) { |
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threadUnexpectedException(ex); |
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} |
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} |
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/** |
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* register() correctly returns the current barrier phase number when |
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* invoked |
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*/ |
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public void testRegister3() { |
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Phaser phaser = new Phaser(); |
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assertEquals(0, phaser.register()); |
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phaser.arrive(); |
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assertEquals(1, phaser.register()); |
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} |
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/** |
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* register causes the next arrive to not increment the phase rather retain |
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* the phase number |
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*/ |
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public void testRegister4() { |
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Phaser phaser = new Phaser(1); |
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phaser.arrive(); |
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int expectedPhase = phaser.register(); |
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phaser.arrive(); |
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assertEquals(expectedPhase, phaser.getPhase()); |
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} |
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public void testRegister5() { |
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Phaser phaser = new Phaser(); |
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phaser.register(); |
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assertEquals(1, phaser.getUnarrivedParties()); |
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} |
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/** |
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* Invoking bulkRegister with a negative parameter throws an |
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* IllegalArgumentExceptiom |
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*/ |
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public void testBulkRegister1() { |
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try { |
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new Phaser().bulkRegister(-1); |
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shouldThrow(); |
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} catch (IllegalArgumentException success) { |
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} |
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} |
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/** |
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* bulkRegister should correctly record the number of unarrived parties with |
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* the number of parties being registered |
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*/ |
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public void testBulkRegister2() { |
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Phaser phaser = new Phaser(); |
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phaser.bulkRegister(20); |
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assertEquals(20, phaser.getUnarrivedParties()); |
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} |
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/** |
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* Registering with a number of parties greater then or equal to 1<<16 |
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* throws IllegalStateExceptiom. |
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*/ |
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public void testBulkRegister3() { |
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try { |
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new Phaser().bulkRegister(1 << 16); |
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shouldThrow(); |
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} catch (IllegalStateException success) { |
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} |
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} |
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/** |
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* the phase number increments correctly when tripping the barrier |
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*/ |
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public void testPhaseIncrement1() { |
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for (int size = 1; size < nine; size++) { |
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final Phaser phaser = new Phaser(size); |
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for (int index = 0; index <= (1 << size); index++) { |
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int phase = phaser.arrive(); |
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assertTrue(index % size == 0 ? (index / size) == phase : index - (phase * size) > 0); |
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} |
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} |
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} |
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/** |
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* Arrive() on a registered phaser increments phase. |
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*/ |
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public void testArrive1() { |
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Phaser phaser = new Phaser(1); |
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phaser.arrive(); |
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assertEquals(1, phaser.getPhase()); |
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} |
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/** |
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* arrive does not wait for others to arrive at barrier |
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*/ |
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public void testArrive2() { |
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final Phaser phaser = new Phaser(1); |
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phaser.register(); |
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Thread thread = null; |
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for (final Runnable r : getRunnables(10, SHORT_DELAY_MS)) { |
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phaser.register(); |
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thread = new Thread() { |
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public void run() { |
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r.run(); |
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phaser.arriveAndDeregister(); |
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} |
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}; |
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thread.start(); |
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} |
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phaser.arrive(); |
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assertTrue(thread.isAlive()); |
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assertFalse(phaser.isTerminated()); |
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} |
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/** |
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jsr166 |
1.3 |
* arrive() returns a negative number if the Phaser is terminated |
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dl |
1.1 |
*/ |
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public void testArrive3() { |
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Phaser phaser = new Phaser(1); |
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phaser.forceTermination(); |
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assertTrue(phaser.arrive() < 0); |
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} |
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/** |
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* arriveAndDeregister() throws IllegalStateException if number of |
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jsr166 |
1.3 |
* registered or unarrived parties would become negative |
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dl |
1.1 |
*/ |
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public void testArriveAndDeregister1() { |
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try { |
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Phaser phaser = new Phaser(); |
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phaser.arriveAndDeregister(); |
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shouldThrow(); |
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} catch (IllegalStateException success) { |
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} |
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} |
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/** |
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jsr166 |
1.3 |
* arriveAndDeregister deregisters reduces the number of arrived parties |
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dl |
1.1 |
*/ |
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public void testArriveAndDergeister2() { |
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final Phaser phaser = new Phaser(1); |
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phaser.register(); |
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phaser.arrive(); |
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int p = phaser.getArrivedParties(); |
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assertTrue(p == 1); |
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phaser.arriveAndDeregister(); |
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assertTrue(phaser.getArrivedParties() < p); |
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} |
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255 |
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/** |
256 |
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* arriveAndDeregister arrives to the barrier on a phaser with a parent and |
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* when a deregistration occurs and causes the phaser to have zero parties |
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* its parent will be deregistered as well |
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*/ |
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public void testArriveAndDeregsiter3() { |
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Phaser parent = new Phaser(); |
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Phaser root = new Phaser(parent); |
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root.register(); |
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assertTrue(parent.getUnarrivedParties() > 0); |
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assertTrue(root.getUnarrivedParties() > 0); |
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root.arriveAndDeregister(); |
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assertTrue(parent.getUnarrivedParties() == 0); |
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assertTrue(root.getUnarrivedParties() == 0); |
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assertTrue(root.isTerminated() && parent.isTerminated()); |
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} |
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/** |
273 |
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* arriveAndDeregister deregisters one party from its parent when |
274 |
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* the number of parties of root is zero after deregistration |
275 |
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*/ |
276 |
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public void testArriveAndDeregsiter4() { |
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Phaser parent = new Phaser(); |
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Phaser root = new Phaser(parent); |
279 |
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parent.register(); |
280 |
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root.register(); |
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int parentParties = parent.getUnarrivedParties(); |
282 |
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root.arriveAndDeregister(); |
283 |
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assertEquals(parentParties - 1, parent.getUnarrivedParties()); |
284 |
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} |
285 |
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286 |
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/** |
287 |
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* arriveAndDeregister deregisters one party from its parent when |
288 |
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* the number of parties of root is nonzero after deregistration. |
289 |
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*/ |
290 |
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public void testArriveAndDeregister5() { |
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Phaser parent = new Phaser(); |
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Phaser child = new Phaser(parent); |
293 |
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Phaser root = new Phaser(child); |
294 |
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assertTrue(parent.getUnarrivedParties() > 0); |
295 |
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assertTrue(child.getUnarrivedParties() > 0); |
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root.register(); |
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root.arriveAndDeregister(); |
298 |
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assertTrue(parent.getUnarrivedParties() == 0); |
299 |
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assertTrue(child.getUnarrivedParties() == 0); |
300 |
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assertTrue(root.isTerminated()); |
301 |
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} |
302 |
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303 |
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/** |
304 |
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* arriveAndDeregister returns the phase in which it leaves the |
305 |
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* phaser in after deregistration |
306 |
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*/ |
307 |
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public void testArriveAndDeregister6() { |
308 |
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final Phaser phaser = new Phaser(2); |
309 |
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new Thread() { |
310 |
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311 |
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public void run() { |
312 |
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getRunnable(SHORT_DELAY_MS).run(); |
313 |
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phaser.arrive(); |
314 |
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} |
315 |
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}.start(); |
316 |
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phaser.arriveAndAwaitAdvance(); |
317 |
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int phase = phaser.arriveAndDeregister(); |
318 |
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assertEquals(phase, phaser.getPhase()); |
319 |
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} |
320 |
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321 |
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/** |
322 |
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* awaitAdvance succeeds upon advance |
323 |
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*/ |
324 |
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public void testAwaitAdvance1() { |
325 |
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final Phaser phaser = new Phaser(1); |
326 |
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phaser.awaitAdvance(phaser.arrive()); |
327 |
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} |
328 |
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329 |
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/** |
330 |
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* awaitAdvance with a negative parameter will return without affecting the |
331 |
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* phaser |
332 |
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*/ |
333 |
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public void testAwaitAdvance2() { |
334 |
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try { |
335 |
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Phaser phaser = new Phaser(); |
336 |
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phaser.awaitAdvance(-1); |
337 |
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} catch (Exception failure) { |
338 |
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this.unexpectedException(); |
339 |
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} |
340 |
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} |
341 |
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342 |
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/** |
343 |
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* awaitAdvance while waiting does not abort on interrupt. |
344 |
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*/ |
345 |
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public void testAwaitAdvance3() { |
346 |
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final Phaser phaser = new Phaser(); |
347 |
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Thread th1 = new Thread() { |
348 |
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349 |
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public void run() { |
350 |
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try { |
351 |
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phaser.register(); |
352 |
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getRunnable(LONG_DELAY_MS).run(); |
353 |
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phaser.awaitAdvance(phaser.arrive()); |
354 |
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} catch (Exception failure) { |
355 |
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threadUnexpectedException(failure); |
356 |
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} |
357 |
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358 |
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} |
359 |
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}; |
360 |
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phaser.register(); |
361 |
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th1.start(); |
362 |
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try { |
363 |
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Thread.sleep(SHORT_DELAY_MS); |
364 |
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th1.interrupt(); |
365 |
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Thread.sleep(LONG_DELAY_MS); |
366 |
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phaser.arrive(); |
367 |
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} catch (Exception failure) { |
368 |
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unexpectedException(); |
369 |
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} |
370 |
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assertFalse(th1.isInterrupted()); |
371 |
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} |
372 |
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373 |
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/** |
374 |
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* awaitAdvance atomically waits for all parties within the same phase to |
375 |
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* complete before continuing |
376 |
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*/ |
377 |
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public void testAwaitAdvance4() { |
378 |
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final Phaser phaser = new Phaser(four); |
379 |
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final AtomicInteger phaseCount = new AtomicInteger(0); |
380 |
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for (int i = 0; i < four; i++) { |
381 |
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new Thread() { |
382 |
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383 |
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public void run() { |
384 |
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int phase = phaser.arrive(); |
385 |
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phaseCount.incrementAndGet(); |
386 |
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getRunnable(LONG_DELAY_MS).run(); |
387 |
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phaser.awaitAdvance(phase); |
388 |
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assertTrue(phaseCount.get() == four); |
389 |
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} |
390 |
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}.start(); |
391 |
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} |
392 |
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} |
393 |
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|
394 |
|
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/** |
395 |
|
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* awaitAdvance returns the current phase |
396 |
|
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*/ |
397 |
|
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public void testAwaitAdvance5() { |
398 |
|
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final Phaser phaser = new Phaser(1); |
399 |
|
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int phase = phaser.awaitAdvance(phaser.arrive()); |
400 |
|
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assertEquals(phase, phaser.getPhase()); |
401 |
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phaser.register(); |
402 |
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for (int i = 0; i < eight; i++) { |
403 |
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new Thread() { |
404 |
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|
405 |
|
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public void run() { |
406 |
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getRunnable(SHORT_DELAY_MS).run(); |
407 |
|
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phaser.arrive(); |
408 |
|
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} |
409 |
|
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}.start(); |
410 |
|
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phase = phaser.awaitAdvance(phaser.arrive()); |
411 |
|
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assertEquals(phase, phaser.getPhase()); |
412 |
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} |
413 |
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} |
414 |
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|
415 |
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/** |
416 |
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* awaitAdvance returns when the phaser is externally terminated |
417 |
|
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*/ |
418 |
|
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public void testAwaitAdvance6() { |
419 |
|
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final Phaser phaser = new Phaser(3); |
420 |
|
|
/* |
421 |
|
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* Start new thread. This thread waits a small amount of time |
422 |
|
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* and waits for the other two parties to arrive. The party |
423 |
|
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* in the main thread arrives quickly so at best this thread |
424 |
|
|
* waits for the second thread's party to arrive |
425 |
|
|
*/ |
426 |
|
|
new Thread() { |
427 |
jsr166 |
1.2 |
|
428 |
dl |
1.1 |
public void run() { |
429 |
|
|
getRunnable(SMALL_DELAY_MS).run(); |
430 |
|
|
int phase = phaser.awaitAdvance(phaser.arrive()); |
431 |
|
|
/* |
432 |
|
|
* This point is reached when force termination is called in which phase = -1 |
433 |
|
|
*/ |
434 |
|
|
threadAssertTrue(phase < 0); |
435 |
|
|
threadAssertTrue(phaser.isTerminated()); |
436 |
|
|
} |
437 |
|
|
}.start(); |
438 |
|
|
/* |
439 |
|
|
* This thread will cause the first thread run to wait, in doing so |
440 |
jsr166 |
1.2 |
* the main thread will force termination in which the first thread |
441 |
|
|
* should exit peacefully as this one |
442 |
dl |
1.1 |
*/ |
443 |
|
|
new Thread() { |
444 |
|
|
|
445 |
|
|
public void run() { |
446 |
|
|
getRunnable(LONG_DELAY_MS).run(); |
447 |
|
|
int p1 = phaser.arrive(); |
448 |
|
|
int phase = phaser.awaitAdvance(p1); |
449 |
|
|
threadAssertTrue(phase < 0); |
450 |
|
|
threadAssertTrue(phaser.isTerminated()); |
451 |
|
|
} |
452 |
|
|
}.start(); |
453 |
|
|
|
454 |
|
|
phaser.arrive(); |
455 |
|
|
phaser.forceTermination(); |
456 |
|
|
} |
457 |
|
|
|
458 |
|
|
/** |
459 |
|
|
* arriveAndAwaitAdvance throws IllegalStateException with no |
460 |
|
|
* unarrived parties |
461 |
|
|
*/ |
462 |
|
|
public void testArriveAndAwaitAdvance1() { |
463 |
|
|
try { |
464 |
|
|
Phaser phaser = new Phaser(); |
465 |
|
|
phaser.arriveAndAwaitAdvance(); |
466 |
|
|
shouldThrow(); |
467 |
|
|
} catch (IllegalStateException success) { |
468 |
|
|
} |
469 |
|
|
} |
470 |
|
|
|
471 |
|
|
/** |
472 |
|
|
* Interrupted arriveAndAwaitAdvance does not throw InterruptedException |
473 |
|
|
*/ |
474 |
|
|
public void testArriveAndAwaitAdvance2() { |
475 |
|
|
final Phaser phaser = new Phaser(2); |
476 |
|
|
Thread th = new Thread() { |
477 |
|
|
public void run() { |
478 |
|
|
try { |
479 |
|
|
phaser.arriveAndAwaitAdvance(); |
480 |
|
|
} catch (Exception failure) { |
481 |
|
|
threadUnexpectedException(failure); |
482 |
|
|
} |
483 |
|
|
} |
484 |
|
|
}; |
485 |
|
|
|
486 |
|
|
try { |
487 |
|
|
th.start(); |
488 |
|
|
Thread.sleep(LONG_DELAY_MS); |
489 |
|
|
th.interrupt(); |
490 |
|
|
Thread.sleep(LONG_DELAY_MS); |
491 |
|
|
phaser.arrive(); |
492 |
|
|
} catch (InterruptedException failure) { |
493 |
|
|
this.unexpectedException(); |
494 |
|
|
} |
495 |
|
|
assertFalse(th.isInterrupted()); |
496 |
|
|
} |
497 |
|
|
|
498 |
|
|
/** |
499 |
|
|
* arriveAndAwaitAdvance waits for all threads to arrive, the |
500 |
|
|
* number of arrived parties is the same number that is accounted |
501 |
|
|
* for when the main thread awaitsAdvance |
502 |
|
|
*/ |
503 |
|
|
public void testArriveAndAwaitAdvance3() { |
504 |
|
|
final Phaser phaser = new Phaser(1); |
505 |
|
|
final AtomicInteger arrivingCount = new AtomicInteger(0); |
506 |
|
|
for (final Runnable run : getRunnables(six, SHORT_DELAY_MS)) { |
507 |
|
|
new Thread() { |
508 |
|
|
|
509 |
|
|
public void run() { |
510 |
|
|
phaser.register(); |
511 |
|
|
run.run(); |
512 |
|
|
arrivingCount.getAndIncrement(); |
513 |
|
|
phaser.arrive(); |
514 |
|
|
} |
515 |
|
|
}.start(); |
516 |
|
|
} |
517 |
|
|
int phaseNumber = phaser.arriveAndAwaitAdvance(); |
518 |
|
|
arrivingCount.incrementAndGet(); |
519 |
|
|
//the + 1 adds to expectedArrive to account for the main threads arrival |
520 |
|
|
int expectedArrived = phaseNumber > 0 ? phaseNumber * six + 1 : phaser.getArrivedParties() + 1; |
521 |
|
|
threadAssertEquals(expectedArrived, arrivingCount.get()); |
522 |
|
|
} |
523 |
|
|
// .. initially called, for n tasks via |
524 |
|
|
private List<Runnable> getRunnables(int size, long wait) { |
525 |
|
|
List<Runnable> list = new ArrayList<Runnable>(); |
526 |
|
|
for (int i = 0; i < size; i++) { |
527 |
|
|
list.add(getRunnable(wait)); |
528 |
|
|
} |
529 |
|
|
return list; |
530 |
|
|
} |
531 |
|
|
|
532 |
|
|
private Runnable getRunnable(final long wait) { |
533 |
|
|
return new Runnable() { |
534 |
|
|
|
535 |
|
|
public void run() { |
536 |
|
|
try { |
537 |
|
|
Thread.sleep(wait); |
538 |
|
|
} catch (InterruptedException noop) { |
539 |
|
|
// sleep interruption isn't a problem case for these example |
540 |
|
|
} catch (Exception ex) { |
541 |
|
|
threadUnexpectedException(ex); |
542 |
|
|
} |
543 |
|
|
|
544 |
|
|
} |
545 |
|
|
}; |
546 |
|
|
} |
547 |
|
|
|
548 |
|
|
} |