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/*
* Copyright (C) 2010, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.lib;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import org.junit.Test;
public class ThreadSafeProgressMonitorTest {
@Test
public void testFailsMethodsOnBackgroundThread()
throws InterruptedException {
final MockProgressMonitor mock = new MockProgressMonitor();
final ThreadSafeProgressMonitor pm = new ThreadSafeProgressMonitor(mock);
runOnThread(() -> {
try {
pm.start(1);
fail("start did not fail on background thread");
} catch (IllegalStateException notMainThread) {
// Expected result
}
try {
pm.beginTask("title", 1);
fail("beginTask did not fail on background thread");
} catch (IllegalStateException notMainThread) {
// Expected result
}
try {
pm.endTask();
fail("endTask did not fail on background thread");
} catch (IllegalStateException notMainThread) {
// Expected result
}
});
// Ensure we didn't alter the mock above when checking threads.
assertNull(mock.taskTitle);
assertEquals(0, mock.value);
}
@Test
public void testMethodsOkOnMainThread() {
final MockProgressMonitor mock = new MockProgressMonitor();
final ThreadSafeProgressMonitor pm = new ThreadSafeProgressMonitor(mock);
pm.start(1);
assertEquals(1, mock.value);
pm.beginTask("title", 42);
assertEquals("title", mock.taskTitle);
assertEquals(42, mock.value);
pm.update(1);
pm.pollForUpdates();
assertEquals(43, mock.value);
pm.update(2);
pm.pollForUpdates();
assertEquals(45, mock.value);
pm.endTask();
assertNull(mock.taskTitle);
assertEquals(0, mock.value);
}
@Test
public void testUpdateOnBackgroundThreads() throws InterruptedException {
final MockProgressMonitor mock = new MockProgressMonitor();
final ThreadSafeProgressMonitor pm = new ThreadSafeProgressMonitor(mock);
pm.startWorker();
final CountDownLatch doUpdate = new CountDownLatch(1);
final CountDownLatch didUpdate = new CountDownLatch(1);
final CountDownLatch doEndWorker = new CountDownLatch(1);
final Thread bg = new Thread() {
@Override
public void run() {
assertFalse(pm.isCancelled());
await(doUpdate);
pm.update(2);
didUpdate.countDown();
await(doEndWorker);
pm.update(1);
pm.endWorker();
}
};
bg.start();
pm.pollForUpdates();
assertEquals(0, mock.value);
doUpdate.countDown();
await(didUpdate);
pm.pollForUpdates();
assertEquals(2, mock.value);
doEndWorker.countDown();
pm.waitForCompletion();
assertEquals(3, mock.value);
}
private static void await(CountDownLatch cdl) {
try {
assertTrue("latch released", cdl.await(1000, TimeUnit.MILLISECONDS));
} catch (InterruptedException ie) {
throw new AssertionError("Did not expect to be interrupted", ie);
}
}
private static void runOnThread(Runnable task) throws InterruptedException {
Thread t = new Thread(task);
t.start();
t.join(1000);
assertFalse("thread has stopped", t.isAlive());
}
private static class MockProgressMonitor implements ProgressMonitor {
String taskTitle;
int value;
@Override
public void update(int completed) {
value += completed;
}
@Override
public void start(int totalTasks) {
value = totalTasks;
}
@Override
public void beginTask(String title, int totalWork) {
taskTitle = title;
value = totalWork;
}
@Override
public void endTask() {
taskTitle = null;
value = 0;
}
@Override
public boolean isCancelled() {
return false;
}
@Override
public void showDuration(boolean enabled) {
// not implemented
}
}
}
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