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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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*/ |
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|
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import junit.framework.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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|
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public class ExchangerTest extends JSR166TestCase { |
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|
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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(ExchangerTest.class); |
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} |
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|
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/** |
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* exchange exchanges objects across two threads |
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*/ |
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public void testExchange() { |
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final Exchanger e = new Exchanger(); |
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Thread t1 = new Thread(new Runnable(){ |
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public void run(){ |
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try { |
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Object v = e.exchange(one); |
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threadAssertEquals(v, two); |
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Object w = e.exchange(v); |
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threadAssertEquals(w, one); |
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} catch (InterruptedException e){ |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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Thread t2 = new Thread(new Runnable(){ |
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public void run(){ |
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try { |
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Object v = e.exchange(two); |
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threadAssertEquals(v, one); |
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Object w = e.exchange(v); |
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threadAssertEquals(w, two); |
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} catch (InterruptedException e){ |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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try { |
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t1.start(); |
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t2.start(); |
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t1.join(); |
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t2.join(); |
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} catch (InterruptedException ex) { |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* timed exchange exchanges objects across two threads |
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*/ |
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public void testTimedExchange() { |
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final Exchanger e = new Exchanger(); |
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Thread t1 = new Thread(new Runnable(){ |
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public void run(){ |
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try { |
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Object v = e.exchange(one, SHORT_DELAY_MS, TimeUnit.MILLISECONDS); |
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threadAssertEquals(v, two); |
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Object w = e.exchange(v, SHORT_DELAY_MS, TimeUnit.MILLISECONDS); |
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threadAssertEquals(w, one); |
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} catch (InterruptedException e){ |
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threadUnexpectedException(); |
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} catch (TimeoutException toe) { |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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Thread t2 = new Thread(new Runnable(){ |
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public void run(){ |
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try { |
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Object v = e.exchange(two, SHORT_DELAY_MS, TimeUnit.MILLISECONDS); |
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threadAssertEquals(v, one); |
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Object w = e.exchange(v, SHORT_DELAY_MS, TimeUnit.MILLISECONDS); |
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threadAssertEquals(w, two); |
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} catch (InterruptedException e){ |
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threadUnexpectedException(); |
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} catch (TimeoutException toe) { |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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try { |
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t1.start(); |
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t2.start(); |
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t1.join(); |
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t2.join(); |
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} catch (InterruptedException ex) { |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* interrupt during wait for exchange throws IE |
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*/ |
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public void testExchange_InterruptedException(){ |
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final Exchanger e = new Exchanger(); |
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Thread t = new Thread(new Runnable() { |
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public void run(){ |
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try { |
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e.exchange(one); |
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threadShouldThrow(); |
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} catch (InterruptedException success){ |
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} |
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} |
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}); |
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try { |
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t.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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t.join(); |
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} catch (InterruptedException ex) { |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* interrupt during wait for timed exchange throws IE |
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*/ |
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public void testTimedExchange_InterruptedException(){ |
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final Exchanger e = new Exchanger(); |
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Thread t = new Thread(new Runnable() { |
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public void run(){ |
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try { |
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e.exchange(null, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS); |
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threadShouldThrow(); |
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} catch (InterruptedException success){ |
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} catch (Exception e2){ |
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threadFail("should throw IE"); |
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} |
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} |
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}); |
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try { |
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t.start(); |
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t.interrupt(); |
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t.join(); |
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} catch (InterruptedException ex){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* timeout during wait for timed exchange throws TOE |
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*/ |
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public void testExchange_TimeOutException(){ |
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final Exchanger e = new Exchanger(); |
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Thread t = new Thread(new Runnable() { |
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public void run(){ |
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try { |
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e.exchange(null, SHORT_DELAY_MS, TimeUnit.MILLISECONDS); |
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threadShouldThrow(); |
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} catch (TimeoutException success){ |
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} catch (InterruptedException e2){ |
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threadFail("should throw TOE"); |
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} |
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} |
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}); |
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try { |
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t.start(); |
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t.join(); |
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} catch (InterruptedException ex){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* If one exchanging thread is interrupted, another succeeds. |
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*/ |
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public void testReplacementAfterExchange() { |
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final Exchanger e = new Exchanger(); |
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Thread t1 = new Thread(new Runnable(){ |
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public void run(){ |
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try { |
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Object v = e.exchange(one); |
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threadAssertEquals(v, two); |
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Object w = e.exchange(v); |
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threadShouldThrow(); |
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} catch (InterruptedException success){ |
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} |
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} |
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}); |
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Thread t2 = new Thread(new Runnable(){ |
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public void run(){ |
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try { |
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Object v = e.exchange(two); |
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threadAssertEquals(v, one); |
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Thread.sleep(SMALL_DELAY_MS); |
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Object w = e.exchange(v); |
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threadAssertEquals(w, three); |
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} catch (InterruptedException e){ |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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Thread t3 = new Thread(new Runnable(){ |
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public void run(){ |
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try { |
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Thread.sleep(SMALL_DELAY_MS); |
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Object w = e.exchange(three); |
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threadAssertEquals(w, one); |
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} catch (InterruptedException e){ |
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threadUnexpectedException(); |
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} |
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} |
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}); |
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|
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try { |
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t1.start(); |
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t2.start(); |
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t3.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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t1.interrupt(); |
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t1.join(); |
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t2.join(); |
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t3.join(); |
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} catch (InterruptedException ex) { |
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unexpectedException(); |
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} |
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} |
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|
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} |