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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.skyframe;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.cmdline.RepositoryName;
import com.google.devtools.build.lib.packages.Package;
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;
/**
* <p>Computes {@link CollectPackagesUnderDirectoryValue} which describes whether the directory is a
* package and whether non-excluded packages exist below each of the directory's subdirectories. As
* a side effect, loads all of these packages, in order to interleave the disk-bound work of
* checking for directories and the CPU-bound work of package loading.
*/
public class CollectPackagesUnderDirectoryFunction implements SkyFunction {
private final BlazeDirectories directories;
public CollectPackagesUnderDirectoryFunction(BlazeDirectories directories) {
this.directories = directories;
}
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws InterruptedException {
return new MyTraversalFunction().visitDirectory((RecursivePkgKey) skyKey.argument(), env);
}
private class MyTraversalFunction
extends RecursiveDirectoryTraversalFunction<MyVisitor, CollectPackagesUnderDirectoryValue> {
private MyTraversalFunction() {
super(directories);
}
@Override
protected CollectPackagesUnderDirectoryValue getEmptyReturn() {
return CollectPackagesUnderDirectoryValue.EMPTY;
}
@Override
protected MyVisitor getInitialVisitor() {
return new MyVisitor();
}
@Override
protected SkyKey getSkyKeyForSubdirectory(
RepositoryName repository,
RootedPath subdirectory,
ImmutableSet<PathFragment> excludedSubdirectoriesBeneathSubdirectory) {
return CollectPackagesUnderDirectoryValue.key(
repository, subdirectory, excludedSubdirectoriesBeneathSubdirectory);
}
@Override
protected CollectPackagesUnderDirectoryValue 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()) {
RecursivePkgKey recursivePkgKey = (RecursivePkgKey) key.argument();
CollectPackagesUnderDirectoryValue collectPackagesValue =
(CollectPackagesUnderDirectoryValue) subdirectorySkyValues.get(key);
boolean packagesInSubdirectory = collectPackagesValue.isDirectoryPackage();
// If the subdirectory isn't a package, check to see if any of its subdirectories
// transitively contain packages.
if (!packagesInSubdirectory) {
ImmutableCollection<Boolean> subdirectoryValues =
collectPackagesValue.getSubdirectoryTransitivelyContainsPackages().values();
for (Boolean pkgsInSubSub : subdirectoryValues) {
if (pkgsInSubSub) {
packagesInSubdirectory = true;
break;
}
}
}
builder.put(recursivePkgKey.getRootedPath(), packagesInSubdirectory);
}
return CollectPackagesUnderDirectoryValue.of(visitor.isDirectoryPackage(), builder.build());
}
}
private static class MyVisitor implements RecursiveDirectoryTraversalFunction.Visitor {
private boolean isDirectoryPackage;
private MyVisitor() {}
@Override
public void visitPackageValue(Package pkg, Environment env) {
isDirectoryPackage = true;
}
boolean isDirectoryPackage() {
return isDirectoryPackage;
}
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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