// 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.base.MoreObjects; 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.concurrent.ThreadSafety.ThreadSafe; 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.SkyKey; import com.google.devtools.build.skyframe.SkyValue; import java.util.Objects; /** * The value computed by {@link CollectPackagesUnderDirectoryFunction}. Contains a mapping for all * its non-excluded directories to whether there are packages beneath them. * *
This value is used by {@link GraphBackedRecursivePackageProvider#getPackagesUnderDirectory} * to help it traverse the graph and find the set of packages under a directory, recursively by * {@link CollectPackagesUnderDirectoryFunction} which computes a value for a directory by * aggregating results calculated from its subdirectories, and by * {@link PrepareDepsOfTargetsUnderDirectoryFunction} which uses this value to find transitive * targets to load. * *
Note that even though the {@link CollectPackagesUnderDirectoryFunction} is evaluated in
* part because of its side-effects (i.e. loading transitive dependencies of targets), this value
* interacts safely with change pruning, despite the fact that this value is a lossy representation
* of the packages beneath a directory (i.e. it doesn't care which packages are under a
* directory, just whether there are any). When the targets in a package change, the
* {@link PackageValue} that {@link CollectPackagesUnderDirectoryFunction} depends on will be
* invalidated, and the PrepareDeps function for that package's directory will be reevaluated,
* loading any new transitive dependencies. Change pruning may prevent the reevaluation of
* PrepareDeps for directories above that one, but they don't need to be re-run.
*/
public class CollectPackagesUnderDirectoryValue implements SkyValue {
public static final CollectPackagesUnderDirectoryValue EMPTY =
new CollectPackagesUnderDirectoryValue(false, ImmutableMap.