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// Copyright 2015 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.lib.skyframe;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.cmdline.PackageIdentifier.RepositoryName;
import com.google.devtools.build.lib.cmdline.ResolvedTargets;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.pkgcache.FilteringPolicy;
import com.google.devtools.build.lib.pkgcache.TargetPatternResolverUtil;
import com.google.devtools.build.lib.skyframe.PrepareDepsOfTargetsUnderDirectoryValue.PrepareDepsOfTargetsUnderDirectoryKey;
import com.google.devtools.build.lib.skyframe.RecursivePkgValue.RecursivePkgKey;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Ensures the graph contains the targets in the directory's package, if any, and in the
* non-excluded packages in its subdirectories, and all those targets' transitive dependencies,
* after a successful evaluation.
*
* <p>Computes {@link PrepareDepsOfTargetsUnderDirectoryValue} which describes whether the
* directory is a package and how many non-excluded packages exist below each of the directory's
* subdirectories.
*/
public class PrepareDepsOfTargetsUnderDirectoryFunction implements SkyFunction {
@Override
public SkyValue compute(SkyKey skyKey, Environment env) {
PrepareDepsOfTargetsUnderDirectoryKey argument =
(PrepareDepsOfTargetsUnderDirectoryKey) skyKey.argument();
FilteringPolicy filteringPolicy = argument.getFilteringPolicy();
RecursivePkgKey recursivePkgKey = argument.getRecursivePkgKey();
return new MyTraversalFunction(filteringPolicy).visitDirectory(recursivePkgKey, env);
}
private static class MyTraversalFunction
extends RecursiveDirectoryTraversalFunction<MyVisitor,
PrepareDepsOfTargetsUnderDirectoryValue> {
private final FilteringPolicy filteringPolicy;
private MyTraversalFunction(FilteringPolicy filteringPolicy) {
this.filteringPolicy = filteringPolicy;
}
@Override
protected PrepareDepsOfTargetsUnderDirectoryValue getEmptyReturn() {
return PrepareDepsOfTargetsUnderDirectoryValue.EMPTY;
}
@Override
protected MyVisitor getInitialVisitor() {
return new MyVisitor(filteringPolicy);
}
@Override
protected SkyKey getSkyKeyForSubdirectory(RepositoryName repository, RootedPath subdirectory,
ImmutableSet<PathFragment> excludedSubdirectoriesBeneathSubdirectory) {
return PrepareDepsOfTargetsUnderDirectoryValue.key(repository, subdirectory,
excludedSubdirectoriesBeneathSubdirectory, filteringPolicy);
}
@Override
protected PrepareDepsOfTargetsUnderDirectoryValue aggregateWithSubdirectorySkyValues(
MyVisitor visitor, Map<SkyKey, SkyValue> subdirectorySkyValues) {
// Aggregate the child subdirectory package state.
ImmutableMap.Builder<RootedPath, Boolean> builder = ImmutableMap.builder();
for (SkyKey key : subdirectorySkyValues.keySet()) {
PrepareDepsOfTargetsUnderDirectoryKey prepDepsKey =
(PrepareDepsOfTargetsUnderDirectoryKey) key.argument();
PrepareDepsOfTargetsUnderDirectoryValue prepDepsValue =
(PrepareDepsOfTargetsUnderDirectoryValue) subdirectorySkyValues.get(key);
boolean packagesInSubdirectory = prepDepsValue.isDirectoryPackage();
// If the subdirectory isn't a package, check to see if any of its subdirectories
// transitively contain packages.
if (!packagesInSubdirectory) {
ImmutableCollection<Boolean> subdirectoryValues =
prepDepsValue.getSubdirectoryTransitivelyContainsPackages().values();
for (Boolean pkgsInSubSub : subdirectoryValues) {
if (pkgsInSubSub) {
packagesInSubdirectory = true;
break;
}
}
}
builder.put(prepDepsKey.getRecursivePkgKey().getRootedPath(), packagesInSubdirectory);
}
return new PrepareDepsOfTargetsUnderDirectoryValue(visitor.isDirectoryPackage(),
builder.build());
}
}
private static class MyVisitor implements RecursiveDirectoryTraversalFunction.Visitor {
private final FilteringPolicy filteringPolicy;
private boolean isDirectoryPackage;
private MyVisitor(FilteringPolicy filteringPolicy) {
this.filteringPolicy = Preconditions.checkNotNull(filteringPolicy);
}
@Override
public void visitPackageValue(Package pkg, Environment env) {
isDirectoryPackage = true;
loadTransitiveTargets(env, pkg, filteringPolicy);
}
public boolean isDirectoryPackage() {
return isDirectoryPackage;
}
}
private static void loadTransitiveTargets(Environment env, Package pkg,
FilteringPolicy filteringPolicy) {
ResolvedTargets<Target> packageTargets =
TargetPatternResolverUtil.resolvePackageTargets(pkg, filteringPolicy);
ImmutableList.Builder<SkyKey> builder = ImmutableList.builder();
for (Target target : packageTargets.getTargets()) {
builder.add(TransitiveTraversalValue.key(target.getLabel()));
}
ImmutableList<SkyKey> skyKeys = builder.build();
env.getValuesOrThrow(skyKeys, NoSuchPackageException.class, NoSuchTargetException.class);
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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