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[FIXED JENKINS-42150] Add latency options to mock scm impl in SCM API…

…'s test artifact
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stephenc committed Feb 17, 2017
1 parent ce217be commit b89eac3ca21e8b2717223e7405ad060a30eb32b9
@@ -0,0 +1,85 @@
/*
* The MIT License
*
* Copyright (c) 2017 CloudBees, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/

package jenkins.scm.impl.mock;

import java.util.Random;
import java.util.concurrent.TimeUnit;

/**
* Represents latency in connecting to the {@link MockSCM}.
*
* @since 2.0.5
*/
public abstract class MockLatency {
public abstract void apply() throws InterruptedException;

/**
* A fixed latency.
* @param time the latency.
* @param units the units.
* @return a fixed latency.
*/
public static MockLatency fixed(final long time, final TimeUnit units) {
return new MockLatency() {
@Override
public void apply() throws InterruptedException {
units.sleep(time);
}
};
}

/**
* A random latency that has an expected average time.
*
* @param time the expected average latency.
* @param units the units.
* @return a fixed latency.
*/
public static MockLatency average(final long time, final TimeUnit units) {
return new MockLatency() {
final Random entropy = new Random();
@Override
public void apply() throws InterruptedException {
long ms = units.toMillis(time);
ms = Math.min(ms * 3L, Math.max((long) (ms + (ms * entropy.nextGaussian())), 1L));
Thread.sleep(ms);
}
};
}
/**
* A latency that just forces the thread scheduler to yield.
*
* @return a minimal latency that causes background threads to run.
*/
public static MockLatency yield() {
return new MockLatency() {
@Override
public void apply() throws InterruptedException {
Thread.yield();
}
};
}
}
@@ -26,6 +26,7 @@
package jenkins.scm.impl.mock;

import edu.umd.cs.findbugs.annotations.CheckForNull;
import edu.umd.cs.findbugs.annotations.NonNull;
import hudson.FilePath;
import java.io.ByteArrayInputStream;
import java.io.Closeable;
@@ -58,6 +59,7 @@

private Map<String, Repository> repositories = new TreeMap<String, Repository>();
private List<MockFailure> faults = new ArrayList<MockFailure>();
private MockLatency latency = null;
private String displayName;
private String description;
private String url;
@@ -80,6 +82,16 @@ public static MockSCMController create() {
return c;
}

public MockSCMController withLatency(@NonNull MockLatency latency) {
this.latency = latency;
return this;
}

public MockSCMController withoutLatency() {
this.latency = null;
return this;
}

/**
* (Re)creates a {@link MockSCMController} for use when you are running a data migration test.
* It will be the callers responsibility to restore the state of the {@link MockSCMController} accordingly.
@@ -178,7 +190,10 @@ public synchronized void clearFaults() {

public synchronized void checkFaults(@CheckForNull String repository, @CheckForNull String branch,
@CheckForNull String revision, boolean actions)
throws IOException {
throws IOException, InterruptedException {
if (latency != null) {
latency.apply();
}
for (MockFailure fault: faults) {
fault.check(repository, branch, revision, actions);
}

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