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// Copyright 2014 Google Inc. All rights reserved.
//
// 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 com.google.devtools.build.skyframe;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
/** {@link NotifyingInMemoryGraph} that returns reverse deps ordered alphabetically. */
public class DeterministicInMemoryGraph extends NotifyingInMemoryGraph {
public DeterministicInMemoryGraph(Listener listener) {
super(listener);
}
public DeterministicInMemoryGraph() {
super(Listener.NULL_LISTENER);
}
@Override
protected DeterministicValueEntry getEntry(SkyKey key) {
return new DeterministicValueEntry(key);
}
/**
* This class uses TreeSet to store reverse dependencies of NodeEntry. As a result all values are
* lexicographically sorted.
*/
private class DeterministicValueEntry extends NotifyingNodeEntry {
private DeterministicValueEntry(SkyKey myKey) {
super(myKey);
}
final Comparator<SkyKey> valueEntryComparator = new Comparator<SkyKey>() {
@Override
public int compare(SkyKey o1, SkyKey o2) {
return o1.toString().compareTo(o2.toString());
}
};
@SuppressWarnings("unchecked")
@Override
synchronized Iterable<SkyKey> getReverseDeps() {
TreeSet<SkyKey> result = new TreeSet<SkyKey>(valueEntryComparator);
if (reverseDeps instanceof List) {
result.addAll((Collection<? extends SkyKey>) reverseDeps);
} else {
result.add((SkyKey) reverseDeps);
}
return result;
}
@Override
synchronized Set<SkyKey> getInProgressReverseDeps() {
TreeSet<SkyKey> result = new TreeSet<SkyKey>(valueEntryComparator);
result.addAll(buildingState.getReverseDepsToSignal());
return result;
}
}
}
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