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/*
* Copyright 2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.gradle.initialization;
import org.gradle.internal.exceptions.DefaultMultiCauseException;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
public class DefaultBuildCancellationToken implements BuildCancellationToken {
private final Object lock = new Object();
private boolean cancelled;
private List callbacks = new LinkedList();
@Override
public boolean isCancellationRequested() {
synchronized (lock) {
return cancelled;
}
}
@Override
public boolean addCallback(Runnable cancellationHandler) {
boolean returnValue;
synchronized (lock) {
returnValue = cancelled;
if (!cancelled) {
callbacks.add(cancellationHandler);
}
}
if (returnValue) {
cancellationHandler.run();
}
return returnValue;
}
@Override
public void removeCallback(Runnable cancellationHandler) {
synchronized (lock) {
callbacks.remove(cancellationHandler);
}
}
@Override
public void cancel() {
List toCall = new ArrayList();
synchronized (lock) {
if (cancelled) {
return;
}
cancelled = true;
toCall.addAll(callbacks);
callbacks.clear();
}
List failures = new ArrayList();
for (Runnable callback : toCall) {
try {
callback.run();
} catch (Throwable ex) {
failures.add(ex);
}
}
if (!failures.isEmpty()) {
throw new DefaultMultiCauseException("Failed to run cancellation actions.", failures);
}
}
}
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