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// Copyright 2016 The Bazel Authors. 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.lib.query2;
import static com.google.common.collect.ImmutableSet.toImmutableSet;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Multimap;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.concurrent.MultisetSemaphore;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.query2.engine.Callback;
import com.google.devtools.build.lib.query2.engine.QueryException;
import com.google.devtools.build.skyframe.SkyKey;
import java.util.Collection;
import java.util.Set;
/** Helper class to traverse edges, processing targets. */
abstract class AbstractEdgeVisitor<T> extends ParallelVisitor<T, Target> {
private static final int PROCESS_RESULTS_BATCH_SIZE = SkyQueryEnvironment.BATCH_CALLBACK_SIZE;
protected final SkyQueryEnvironment env;
protected final MultisetSemaphore<PackageIdentifier> packageSemaphore;
protected AbstractEdgeVisitor(
SkyQueryEnvironment env,
Callback<Target> callback,
MultisetSemaphore<PackageIdentifier> packageSemaphore) {
super(callback, ParallelSkyQueryUtils.VISIT_BATCH_SIZE, PROCESS_RESULTS_BATCH_SIZE);
this.env = env;
this.packageSemaphore = packageSemaphore;
}
@Override
protected void processPartialResults(
Iterable<SkyKey> keysToUseForResult, Callback<Target> callback)
throws QueryException, InterruptedException {
processResultsAndReturnTargets(keysToUseForResult, callback);
}
protected Iterable<Target> processResultsAndReturnTargets(
Iterable<SkyKey> keysToUseForResult, Callback<Target> callback)
throws QueryException, InterruptedException {
Multimap<SkyKey, SkyKey> packageKeyToTargetKeyMap =
env.makePackageKeyToTargetKeyMap(keysToUseForResult);
Set<PackageIdentifier> pkgIdsNeededForResult =
packageKeyToTargetKeyMap
.keySet()
.stream()
.map(SkyQueryEnvironment.PACKAGE_SKYKEY_TO_PACKAGE_IDENTIFIER)
.collect(toImmutableSet());
packageSemaphore.acquireAll(pkgIdsNeededForResult);
Iterable<Target> targets;
try {
targets = env.makeTargetsFromPackageKeyToTargetKeyMap(packageKeyToTargetKeyMap).values();
callback.process(targets);
} finally {
packageSemaphore.releaseAll(pkgIdsNeededForResult);
}
return targets;
}
protected abstract SkyKey getNewNodeFromEdge(T visit);
@Override
protected Iterable<Task> getVisitTasks(Collection<T> pendingVisits) {
// Group pending visitation by the package of the new node, since we'll be targetfying the
// node during the visitation.
ListMultimap<PackageIdentifier, T> visitsByPackage = ArrayListMultimap.create();
for (T visit : pendingVisits) {
Label label = SkyQueryEnvironment.SKYKEY_TO_LABEL.apply(getNewNodeFromEdge(visit));
if (label != null) {
visitsByPackage.put(label.getPackageIdentifier(), visit);
}
}
ImmutableList.Builder<Task> builder = ImmutableList.builder();
// A couple notes here:
// (i) ArrayListMultimap#values returns the values grouped by key, which is exactly what we
// want.
// (ii) ArrayListMultimap#values returns a Collection view, so we make a copy to avoid
// accidentally retaining the entire ArrayListMultimap object.
for (Iterable<T> visitBatch :
Iterables.partition(
ImmutableList.copyOf(visitsByPackage.values()),
ParallelSkyQueryUtils.VISIT_BATCH_SIZE)) {
builder.add(new VisitTask(visitBatch));
}
return builder.build();
}
}
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