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Improve test isolation and performance of BeginEndRuleTests #725
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Several test cases in BeginEndRuleTests cannot successfully be executed
standalone. When starting a test environment, i.e., a workspace, several
jobs are running on startup. These jobs trigger the JobChangeAdapter
registered in some test cases, which does not properly filter the events
and leads to faulty test results. In addition, the test cases rely on
sleep operations, which waste execution time and at the same time are
prone to fail randomly.

This change rewrite the according test cases:
- Corrects job event filtering for proper test isolation
- Replaces sleep operations with join operation on jobs and barriers to
improve performance and reduce the risk of random failures
- Improves assertions and their messages

Fixes #725.
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@HeikoKlare
HeikoKlare committed Sep 30, 2023
1 parent 6b9f8a0 commit 4d65c67
Showing 1 changed file with 65 additions and 36 deletions.
101 changes: 65 additions & 36 deletions ....eclipse.core.tests.runtime/src/org/eclipse/core/tests/runtime/jobs/BeginEndRuleTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -13,9 +13,27 @@
*******************************************************************************/
package org.eclipse.core.tests.runtime.jobs;

import java.util.concurrent.atomic.*;
import org.eclipse.core.runtime.*;
import org.eclipse.core.runtime.jobs.*;
import static org.hamcrest.CoreMatchers.hasItem;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.not;
import static org.hamcrest.MatcherAssert.assertThat;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicIntegerArray;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.SubMonitor;
import org.eclipse.core.runtime.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.ISchedulingRule;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.core.runtime.jobs.JobChangeAdapter;
import org.eclipse.core.runtime.jobs.ProgressProvider;
import org.eclipse.core.tests.harness.FussyProgressMonitor;
import org.eclipse.core.tests.harness.TestBarrier2;
import org.junit.Test;
Expand All @@ -25,6 +43,8 @@
*/
public class BeginEndRuleTest extends AbstractJobManagerTest {

private static final long TIMEOUT_IN_MILLIS = 10_000;

/**
* This runnable will try to end the given rule in the Job Manager
*/
Expand Down Expand Up @@ -628,79 +648,88 @@ private void waitForEnd(Job job) {
}

public void testIgnoreScheduleThreadJob() throws Exception {
final int[] count = new int[1];
JobChangeAdapter a = new JobChangeAdapter() {
Set<Job> jobsStartedRunning = Collections.synchronizedSet(new HashSet<>());
JobChangeAdapter runningThreadStoreListener = new JobChangeAdapter() {
@Override
public void running(org.eclipse.core.runtime.jobs.IJobChangeEvent event) {
count[0]++;
public void running(IJobChangeEvent event) {
jobsStartedRunning.add(event.getJob());
}
};
Job.getJobManager().addJobChangeListener(a);
Job.getJobManager().addJobChangeListener(runningThreadStoreListener);
IdentityRule rule = new IdentityRule();
Job rescheduledJob = null;
try {
Job.getJobManager().beginRule(rule, null);
Job.getJobManager().currentJob().schedule();
rescheduledJob = Job.getJobManager().currentJob();
rescheduledJob.schedule();
} finally {
Job.getJobManager().endRule(rule);
}
Thread.sleep(250);
Job.getJobManager().removeJobChangeListener(a);
assertEquals("ThreadJob did not ignore reschedule", 0, count[0]);
rescheduledJob.join(TIMEOUT_IN_MILLIS, new NullProgressMonitor());
Job.getJobManager().removeJobChangeListener(runningThreadStoreListener);
assertThat("ThreadJob did not finish", rescheduledJob.getState(), is(Job.NONE));
assertThat("ThreadJob did not ignore reschedule", jobsStartedRunning,
not(hasItem(rescheduledJob)));
}

public void testRunThreadJobIsNotRescheduled() throws Exception {
final int[] count = new int[1];
JobChangeAdapter a = new JobChangeAdapter() {
Set<Job> jobsStartedRunning = Collections.synchronizedSet(new HashSet<>());
JobChangeAdapter runningThreadStoreListener = new JobChangeAdapter() {
@Override
public void running(org.eclipse.core.runtime.jobs.IJobChangeEvent event) {
count[0]++;
public void running(IJobChangeEvent event) {
jobsStartedRunning.add(event.getJob());
}
};
Job.getJobManager().addJobChangeListener(a);
Job.getJobManager().addJobChangeListener(runningThreadStoreListener);
IdentityRule rule = new IdentityRule();
Job scheduledJob = null;
try {
Job.getJobManager().beginRule(rule, null);
scheduledJob = Job.getJobManager().currentJob();
} finally {
Job.getJobManager().endRule(rule);
}
Thread.sleep(250);
Job.getJobManager().removeJobChangeListener(a);
assertEquals("ThreadJob did not ignore reschedule", 0, count[0]);
scheduledJob.join(TIMEOUT_IN_MILLIS, new NullProgressMonitor());
Job.getJobManager().removeJobChangeListener(runningThreadStoreListener);
assertThat("ThreadJob did not finish", scheduledJob.getState(), is(Job.NONE));
assertThat("ThreadJob was rescheduled", jobsStartedRunning, not(hasItem(scheduledJob)));
}

public void testRunNestedAcquireThreadIsNotRescheduled() throws Exception {
final PathRule rule = new PathRule(getName());
final PathRule subRule = new PathRule(getName() + "/subRule");

final int[] count = new int[1];

Set<Job> jobsStartedRunning = Collections.synchronizedSet(new HashSet<>());
JobChangeAdapter runningThreadStoreListener = new JobChangeAdapter() {
@Override
public void running(IJobChangeEvent event) {
jobsStartedRunning.add(event.getJob());
}
};
Job.getJobManager().addJobChangeListener(runningThreadStoreListener);
TestBarrier2 waitForThreadJob = new TestBarrier2();
AtomicReference<Job> scheduledJob = new AtomicReference<>();
final Job job = new Job(getName() + "acquire") {
@Override
protected IStatus run(IProgressMonitor monitor) {
try {
Job.getJobManager().beginRule(subRule, null);
scheduledJob.set(Job.getJobManager().currentJob());
waitForThreadJob.setStatus(TestBarrier2.STATUS_DONE);
} finally {
Job.getJobManager().endRule(subRule);
}
return Status.OK_STATUS;
}
};
job.setRule(rule);

JobChangeAdapter a = new JobChangeAdapter() {
@Override
public void running(org.eclipse.core.runtime.jobs.IJobChangeEvent event) {
if (event.getJob() == job) {
return;
}
count[0]++;
}
};
Job.getJobManager().addJobChangeListener(a);
job.schedule();
Thread.sleep(250);
Job.getJobManager().removeJobChangeListener(a);
assertEquals("ThreadJob did not ignore reschedule", 0, count[0]);
waitForThreadJob.waitForStatus(TestBarrier2.STATUS_DONE);
job.join(TIMEOUT_IN_MILLIS, new NullProgressMonitor());
scheduledJob.get().join(TIMEOUT_IN_MILLIS, new NullProgressMonitor());
Job.getJobManager().removeJobChangeListener(runningThreadStoreListener);
assertThat("Another nested job was created", job, is(scheduledJob.get()));
assertThat("Job did not finish", job.getState(), is(Job.NONE));
}

}

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