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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.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.cmdline.RepositoryName;
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;
/**
* Computes {@link CollectPackagesUnderDirectoryValue} which describes whether the directory is a
* package, or would have been a package but for a package loading error, and whether non-excluded
* packages (or errors) 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<
MyPackageDirectoryConsumer, CollectPackagesUnderDirectoryValue> {
private MyTraversalFunction() {
super(directories);
}
@Override
protected MyPackageDirectoryConsumer getInitialConsumer() {
return new MyPackageDirectoryConsumer();
}
@Override
protected SkyKey getSkyKeyForSubdirectory(
RepositoryName repository,
RootedPath subdirectory,
ImmutableSet<PathFragment> excludedSubdirectoriesBeneathSubdirectory) {
return CollectPackagesUnderDirectoryValue.key(
repository, subdirectory, excludedSubdirectoriesBeneathSubdirectory);
}
@Override
protected CollectPackagesUnderDirectoryValue aggregateWithSubdirectorySkyValues(
MyPackageDirectoryConsumer consumer, 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 packagesOrErrorsInSubdirectory =
collectPackagesValue.isDirectoryPackage()
|| collectPackagesValue.getErrorMessage() != null
|| Iterables.contains(
collectPackagesValue
.getSubdirectoryTransitivelyContainsPackagesOrErrors()
.values(),
Boolean.TRUE);
builder.put(recursivePkgKey.getRootedPath(), packagesOrErrorsInSubdirectory);
}
ImmutableMap<RootedPath, Boolean> subdirectories = builder.build();
String errorMessage = consumer.getErrorMessage();
if (errorMessage != null) {
return CollectPackagesUnderDirectoryValue.ofError(errorMessage, subdirectories);
}
return CollectPackagesUnderDirectoryValue.ofNoError(
consumer.isDirectoryPackage(), subdirectories);
}
}
private static class MyPackageDirectoryConsumer
implements RecursiveDirectoryTraversalFunction.PackageDirectoryConsumer {
private boolean isDirectoryPackage;
@Nullable private String errorMessage;
private MyPackageDirectoryConsumer() {}
@Override
public void notePackage(PathFragment pkgPath) {
isDirectoryPackage = true;
}
@Override
public void notePackageError(String noSuchPackageExceptionErrorMessage) {
this.errorMessage = noSuchPackageExceptionErrorMessage;
}
boolean isDirectoryPackage() {
return isDirectoryPackage;
}
@Nullable
String getErrorMessage() {
return errorMessage;
}
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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