jpa/tests/org.eclipse.jpt.utility.tests/src/org/eclipse/jpt/utility/tests/internal/SynchronizedObjectTests.java - dali/webtools.dali - Git at Google

 /*******************************************************************************
  * Copyright (c) 2007, 2010 Oracle. All rights reserved.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v1.0, which accompanies this distribution
  * and is available at http://www.eclipse.org/legal/epl-v10.html.
  *
  * Contributors:
  *     Oracle - initial API and implementation
  ******************************************************************************/
 package org.eclipse.jpt.utility.tests.internal;

 import org.eclipse.jpt.utility.internal.SynchronizedObject;

 @SuppressWarnings("nls")
 public class SynchronizedObjectTests
 	extends MultiThreadedTestCase
 {
 	private volatile SynchronizedObject<Object> so;
 	volatile boolean timeoutOccurred;
 	volatile Object value = new Object();
 	volatile long startTime;
 	volatile long endTime;
 	volatile Object soValue;


 	public SynchronizedObjectTests(String name) {
 		super(name);
 	}

 	@Override
 	protected void setUp() throws Exception {
 		super.setUp();
 		this.so = new SynchronizedObject<Object>();
 		this.timeoutOccurred = false;
 		this.startTime = 0;
 		this.endTime = 0;
 		this.soValue = null;
 	}

 	public void testAccessors() throws Exception {
 		this.so.setValue(null);
 		assertNull(this.so.getValue());
 		assertFalse(this.so.isNotNull());
 		assertTrue(this.so.isNull());

 		this.so.setValue(this.value);
 		assertEquals(this.value, this.so.getValue());
 		assertTrue(this.so.isNotNull());
 		assertFalse(this.so.isNull());

 		this.so.setNull();
 		assertNull(this.so.getValue());
 		assertFalse(this.so.isNotNull());
 		assertTrue(this.so.isNull());

 		assertSame(this.so, this.so.getMutex());
 	}

 	public void testEquals() throws Exception {
 		this.so.setValue(null);
 		SynchronizedObject<Object> so2 = new SynchronizedObject<Object>(null);
 		assertEquals(this.so, so2);

 		this.so.setValue(this.value);
 		assertFalse(this.so.equals(so2));

 		so2.setValue(this.value);
 		assertEquals(this.so, so2);
 	}

 	public void testHashCode() {
 		this.so.setValue(this.value);
 		assertEquals(this.value.hashCode(), this.so.hashCode());

 		this.so.setValue(null);
 		assertEquals(0, this.so.hashCode());
 	}

 	/**
 	 * t2 will wait indefinitely until t1 sets the value to null
 	 */
 	public void testWaitUntilNull() throws Exception {
 		this.verifyWaitUntilNull(0);
 		// no timeout occurs...
 		assertFalse(this.timeoutOccurred);
 		// ...and the value should be set to null by t2
 		assertNull(this.so.getValue());
 		// make a reasonable guess about how long t2 took
 		long time = this.calculateElapsedTime();
 		assertTrue("t2 finished a bit early (expected value should be > " + TICK + "): " + time, time > TICK);
 	}

 	/**
 	 * t2 will time out waiting for t1 to set the value to null
 	 */
 	public void testWaitUntilNullTimeout() throws Exception {
 		this.verifyWaitUntilNull(TICK);
 		// timeout occurs...
 		assertTrue(this.timeoutOccurred);
 		// ...and the value will eventually be set to null by t1
 		assertNull(this.so.getValue());
 		// make a reasonable guess about how long t2 took
 		long time = this.calculateElapsedTime();
 		assertTrue("t2 finished a bit late (expected value should be < " + THREE_TICKS + "): " + time, time < THREE_TICKS);
 	}

 	private void verifyWaitUntilNull(long t2Timeout) throws Exception {
 		this.executeThreads(this.buildSetNullCommand(), this.buildWaitUntilNullCommand(t2Timeout));
 	}

 	/**
 	 * t2 will wait indefinitely until t1 sets the value to null;
 	 * then t2 will set the value to an object
 	 */
 	public void testWaitToSetValue() throws Exception {
 		this.verifyWaitToSetValue(0);
 		// no timeout occurs...
 		assertFalse(this.timeoutOccurred);
 		// ...and the value should be set to an object by t2
 		assertTrue(this.so.isNotNull());
 		// make a reasonable guess about how long t2 took
 		long time = this.calculateElapsedTime();
 		assertTrue("t2 finished a bit early (expected value should be > " + TICK + "): " + time, time > TICK);
 	}

 	/**
 	 * t2 will time out waiting for t1 to set the value to null
 	 */
 	public void testWaitToSetValueTimeout() throws Exception {
 		this.verifyWaitToSetValue(TICK);
 		// timeout occurs...
 		assertTrue(this.timeoutOccurred);
 		// ...and the value will eventually be set to null by t1
 		assertTrue(this.so.isNull());
 		// make a reasonable guess about how long t2 took
 		long time = this.calculateElapsedTime();
 		assertTrue("t2 finished a bit late (expected value should be < " + THREE_TICKS + "): " + time, time < THREE_TICKS);
 	}

 	private void verifyWaitToSetValue(long t2Timeout) throws Exception {
 		this.executeThreads(this.buildSetNullCommand(), this.buildWaitToSetValueCommand(t2Timeout));
 	}

 	/**
 	 * t2 will wait until t1 is finished "initializing" the value;
 	 * then t2 will get the newly-initialized value ("foo")
 	 */
 	public void testExecute() throws Exception {
 		this.so.setValue(null);
 		Runnable r1 = this.buildRunnable(this.buildInitializeValueCommand(), this.so, 0);
 		// give t1 a head start of 100 ms
 		Runnable r2 = this.buildRunnable(this.buildGetValueCommand(), this.so, TICK);
 		Thread t1 = this.buildThread(r1);
 		Thread t2 = this.buildThread(r2);
 		t1.start();
 		t2.start();
 		t1.join();
 		t2.join();
 		assertEquals("foo", this.so.getValue());
 		assertEquals("foo", this.soValue);
 		// make a reasonable guess about how long t2 took
 		long time = this.calculateElapsedTime();
 		assertTrue("t2 finished a bit early (expected value should be > " + TWO_TICKS + "): " + time, time > TWO_TICKS);
 	}

 	private void executeThreads(Command t1Command, Command t2Command) throws Exception {
 		this.so.setValue(this.value);
 		Runnable r1 = this.buildRunnable(t1Command, this.so, TWO_TICKS);
 		Runnable r2 = this.buildRunnable(t2Command, this.so, 0);
 		Thread t1 = this.buildThread(r1);
 		Thread t2 = this.buildThread(r2);
 		t1.start();
 		t2.start();
 		t1.join();
 		t2.join();
 	}

 	private Command buildSetNullCommand() {
 		return new Command() {
 			public void execute(SynchronizedObject<Object> sObject) {
 				sObject.setNull();
 			}
 		};
 	}

 	private Command buildWaitUntilNullCommand(final long timeout) {
 		return new Command() {
 			public void execute(SynchronizedObject<Object> sObject) throws InterruptedException {
 				SynchronizedObjectTests.this.startTime = System.currentTimeMillis();
 				SynchronizedObjectTests.this.timeoutOccurred = ! sObject.waitUntilNull(timeout);
 				SynchronizedObjectTests.this.endTime = System.currentTimeMillis();
 			}
 		};
 	}

 	private Command buildWaitToSetValueCommand(final long timeout) {
 		return new Command() {
 			public void execute(SynchronizedObject<Object> sObject) throws InterruptedException {
 				SynchronizedObjectTests.this.startTime = System.currentTimeMillis();
 				SynchronizedObjectTests.this.timeoutOccurred = ! sObject.waitToSetValue(SynchronizedObjectTests.this.value, timeout);
 				SynchronizedObjectTests.this.endTime = System.currentTimeMillis();
 			}
 		};
 	}

 	private Command buildInitializeValueCommand() {
 		return new Command() {
 			public void execute(final SynchronizedObject<Object> sObject) throws InterruptedException {
 				sObject.execute(
 					new org.eclipse.jpt.utility.Command() {
 						public void execute() {
 							// pretend to perform some long initialization process
 							try {
 								Thread.sleep(5 * TICK);
 							} catch (Exception ex) {
 								throw new RuntimeException(ex);
 							}
 							sObject.setValue("foo");
 						}
 					}
 				);
 			}
 		};
 	}

 	private Command buildGetValueCommand() {
 		return new Command() {
 			public void execute(SynchronizedObject<Object> sObject) throws InterruptedException {
 				SynchronizedObjectTests.this.startTime = System.currentTimeMillis();
 				SynchronizedObjectTests.this.soValue = sObject.getValue();
 				SynchronizedObjectTests.this.endTime = System.currentTimeMillis();
 			}
 		};
 	}

 	private Runnable buildRunnable(final Command command, final SynchronizedObject<Object> sObject, final long sleep) {
 		return new TestRunnable() {
 			@Override
 			protected void run_() throws InterruptedException {
 				if (sleep != 0) {
 					Thread.sleep(sleep);
 				}
 				command.execute(sObject);
 			}
 		};
 	}

 	private long calculateElapsedTime() {
 		return this.endTime - this.startTime;
 	}


 	// ********** Command interface **********

 	private interface Command {
 		void execute(SynchronizedObject<Object> so) throws InterruptedException;
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2007, 2010 Oracle. All rights reserved.
	* This program and the accompanying materials are made available under the
	* terms of the Eclipse Public License v1.0, which accompanies this distribution
	* and is available at http://www.eclipse.org/legal/epl-v10.html.
	*
	* Contributors:
	* Oracle - initial API and implementation
	******************************************************************************/
	package org.eclipse.jpt.utility.tests.internal;

	import org.eclipse.jpt.utility.internal.SynchronizedObject;

	@SuppressWarnings("nls")
	public class SynchronizedObjectTests
	extends MultiThreadedTestCase
	{
	private volatile SynchronizedObject<Object> so;
	volatile boolean timeoutOccurred;
	volatile Object value = new Object();
	volatile long startTime;
	volatile long endTime;
	volatile Object soValue;


	public SynchronizedObjectTests(String name) {
	super(name);
	}

	@Override
	protected void setUp() throws Exception {
	super.setUp();
	this.so = new SynchronizedObject<Object>();
	this.timeoutOccurred = false;
	this.startTime = 0;
	this.endTime = 0;
	this.soValue = null;
	}

	public void testAccessors() throws Exception {
	this.so.setValue(null);
	assertNull(this.so.getValue());
	assertFalse(this.so.isNotNull());
	assertTrue(this.so.isNull());

	this.so.setValue(this.value);
	assertEquals(this.value, this.so.getValue());
	assertTrue(this.so.isNotNull());
	assertFalse(this.so.isNull());

	this.so.setNull();
	assertNull(this.so.getValue());
	assertFalse(this.so.isNotNull());
	assertTrue(this.so.isNull());

	assertSame(this.so, this.so.getMutex());
	}

	public void testEquals() throws Exception {
	this.so.setValue(null);
	SynchronizedObject<Object> so2 = new SynchronizedObject<Object>(null);
	assertEquals(this.so, so2);

	this.so.setValue(this.value);
	assertFalse(this.so.equals(so2));

	so2.setValue(this.value);
	assertEquals(this.so, so2);
	}

	public void testHashCode() {
	this.so.setValue(this.value);
	assertEquals(this.value.hashCode(), this.so.hashCode());

	this.so.setValue(null);
	assertEquals(0, this.so.hashCode());
	}

	/**
	* t2 will wait indefinitely until t1 sets the value to null
	*/
	public void testWaitUntilNull() throws Exception {
	this.verifyWaitUntilNull(0);
	// no timeout occurs...
	assertFalse(this.timeoutOccurred);
	// ...and the value should be set to null by t2
	assertNull(this.so.getValue());
	// make a reasonable guess about how long t2 took
	long time = this.calculateElapsedTime();
	assertTrue("t2 finished a bit early (expected value should be > " + TICK + "): " + time, time > TICK);
	}

	/**
	* t2 will time out waiting for t1 to set the value to null
	*/
	public void testWaitUntilNullTimeout() throws Exception {
	this.verifyWaitUntilNull(TICK);
	// timeout occurs...
	assertTrue(this.timeoutOccurred);
	// ...and the value will eventually be set to null by t1
	assertNull(this.so.getValue());
	// make a reasonable guess about how long t2 took
	long time = this.calculateElapsedTime();
	assertTrue("t2 finished a bit late (expected value should be < " + THREE_TICKS + "): " + time, time < THREE_TICKS);
	}

	private void verifyWaitUntilNull(long t2Timeout) throws Exception {
	this.executeThreads(this.buildSetNullCommand(), this.buildWaitUntilNullCommand(t2Timeout));
	}

	/**
	* t2 will wait indefinitely until t1 sets the value to null;
	* then t2 will set the value to an object
	*/
	public void testWaitToSetValue() throws Exception {
	this.verifyWaitToSetValue(0);
	// no timeout occurs...
	assertFalse(this.timeoutOccurred);
	// ...and the value should be set to an object by t2
	assertTrue(this.so.isNotNull());
	// make a reasonable guess about how long t2 took
	long time = this.calculateElapsedTime();
	assertTrue("t2 finished a bit early (expected value should be > " + TICK + "): " + time, time > TICK);
	}

	/**
	* t2 will time out waiting for t1 to set the value to null
	*/
	public void testWaitToSetValueTimeout() throws Exception {
	this.verifyWaitToSetValue(TICK);
	// timeout occurs...
	assertTrue(this.timeoutOccurred);
	// ...and the value will eventually be set to null by t1
	assertTrue(this.so.isNull());
	// make a reasonable guess about how long t2 took
	long time = this.calculateElapsedTime();
	assertTrue("t2 finished a bit late (expected value should be < " + THREE_TICKS + "): " + time, time < THREE_TICKS);
	}

	private void verifyWaitToSetValue(long t2Timeout) throws Exception {
	this.executeThreads(this.buildSetNullCommand(), this.buildWaitToSetValueCommand(t2Timeout));
	}

	/**
	* t2 will wait until t1 is finished "initializing" the value;
	* then t2 will get the newly-initialized value ("foo")
	*/
	public void testExecute() throws Exception {
	this.so.setValue(null);
	Runnable r1 = this.buildRunnable(this.buildInitializeValueCommand(), this.so, 0);
	// give t1 a head start of 100 ms
	Runnable r2 = this.buildRunnable(this.buildGetValueCommand(), this.so, TICK);
	Thread t1 = this.buildThread(r1);
	Thread t2 = this.buildThread(r2);
	t1.start();
	t2.start();
	t1.join();
	t2.join();
	assertEquals("foo", this.so.getValue());
	assertEquals("foo", this.soValue);
	// make a reasonable guess about how long t2 took
	long time = this.calculateElapsedTime();
	assertTrue("t2 finished a bit early (expected value should be > " + TWO_TICKS + "): " + time, time > TWO_TICKS);
	}

	private void executeThreads(Command t1Command, Command t2Command) throws Exception {
	this.so.setValue(this.value);
	Runnable r1 = this.buildRunnable(t1Command, this.so, TWO_TICKS);
	Runnable r2 = this.buildRunnable(t2Command, this.so, 0);
	Thread t1 = this.buildThread(r1);
	Thread t2 = this.buildThread(r2);
	t1.start();
	t2.start();
	t1.join();
	t2.join();
	}

	private Command buildSetNullCommand() {
	return new Command() {
	public void execute(SynchronizedObject<Object> sObject) {
	sObject.setNull();
	}
	};
	}

	private Command buildWaitUntilNullCommand(final long timeout) {
	return new Command() {
	public void execute(SynchronizedObject<Object> sObject) throws InterruptedException {
	SynchronizedObjectTests.this.startTime = System.currentTimeMillis();
	SynchronizedObjectTests.this.timeoutOccurred = ! sObject.waitUntilNull(timeout);
	SynchronizedObjectTests.this.endTime = System.currentTimeMillis();
	}
	};
	}

	private Command buildWaitToSetValueCommand(final long timeout) {
	return new Command() {
	public void execute(SynchronizedObject<Object> sObject) throws InterruptedException {
	SynchronizedObjectTests.this.startTime = System.currentTimeMillis();
	SynchronizedObjectTests.this.timeoutOccurred = ! sObject.waitToSetValue(SynchronizedObjectTests.this.value, timeout);
	SynchronizedObjectTests.this.endTime = System.currentTimeMillis();
	}
	};
	}

	private Command buildInitializeValueCommand() {
	return new Command() {
	public void execute(final SynchronizedObject<Object> sObject) throws InterruptedException {
	sObject.execute(
	new org.eclipse.jpt.utility.Command() {
	public void execute() {
	// pretend to perform some long initialization process
	try {
	Thread.sleep(5 * TICK);
	} catch (Exception ex) {
	throw new RuntimeException(ex);
	}
	sObject.setValue("foo");
	}
	}
	);
	}
	};
	}

	private Command buildGetValueCommand() {
	return new Command() {
	public void execute(SynchronizedObject<Object> sObject) throws InterruptedException {
	SynchronizedObjectTests.this.startTime = System.currentTimeMillis();
	SynchronizedObjectTests.this.soValue = sObject.getValue();
	SynchronizedObjectTests.this.endTime = System.currentTimeMillis();
	}
	};
	}

	private Runnable buildRunnable(final Command command, final SynchronizedObject<Object> sObject, final long sleep) {
	return new TestRunnable() {
	@Override
	protected void run_() throws InterruptedException {
	if (sleep != 0) {
	Thread.sleep(sleep);
	}
	command.execute(sObject);
	}
	};
	}

	private long calculateElapsedTime() {
	return this.endTime - this.startTime;
	}


	// ******** Command interface ********

	private interface Command {
	void execute(SynchronizedObject<Object> so) throws InterruptedException;
	}

	}