| // Copyright 2018 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.Preconditions; |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.Interner; |
| import com.google.devtools.build.lib.cmdline.RepositoryName; |
| import com.google.devtools.build.lib.concurrent.BlazeInterners; |
| import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec; |
| import com.google.devtools.build.skyframe.AbstractSkyKey; |
| import com.google.devtools.build.skyframe.SkyFunctionName; |
| import com.google.devtools.build.skyframe.SkyValue; |
| import java.util.Objects; |
| |
| /** |
| * A value that represents the 'mappings' of an external Bazel workspace, as defined in the main |
| * WORKSPACE file. The SkyValue contains the mappings themselves, with the key being the name of the |
| * external repository. |
| * |
| * <p>Given the following rule: |
| * |
| * <pre>{@code |
| * local_repository( |
| * name = "a", |
| * path = "../a", |
| * repo_mapping = {"@x" : "@y"} |
| * ) |
| * }</pre> |
| * |
| * <p>The SkyKey would be {@code "@a"} and the SkyValue would be the map {@code {"@x" : "@y"}} |
| * |
| * <p>This is kept as a separate value with trivial change pruning so as to not necessitate a |
| * dependency from every {@link PackageValue} to the //external {@link PackageValue}, so that |
| * changes to things in the WORKSPACE other than the mappings (and name) won't require reloading all |
| * packages. If the mappings are changed then the external packages need to be reloaded. |
| */ |
| public class RepositoryMappingValue implements SkyValue { |
| |
| private final ImmutableMap<RepositoryName, RepositoryName> repositoryMapping; |
| |
| private RepositoryMappingValue(ImmutableMap<RepositoryName, RepositoryName> repositoryMapping) { |
| Preconditions.checkNotNull(repositoryMapping); |
| this.repositoryMapping = repositoryMapping; |
| } |
| |
| /** Returns the workspace mappings. */ |
| public ImmutableMap<RepositoryName, RepositoryName> getRepositoryMapping() { |
| return repositoryMapping; |
| } |
| |
| /** Returns the {@link Key} for {@link RepositoryMappingValue}s. */ |
| public static Key key(RepositoryName repositoryName) { |
| return RepositoryMappingValue.Key.create(repositoryName); |
| } |
| |
| /** Returns a {@link RepositoryMappingValue} for a workspace with the given name. */ |
| public static RepositoryMappingValue withMapping( |
| ImmutableMap<RepositoryName, RepositoryName> repositoryMapping) { |
| return new RepositoryMappingValue(Preconditions.checkNotNull(repositoryMapping)); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (!(o instanceof RepositoryMappingValue)) { |
| return false; |
| } |
| RepositoryMappingValue other = (RepositoryMappingValue) o; |
| return Objects.equals(repositoryMapping, other.repositoryMapping); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(repositoryMapping); |
| } |
| |
| @Override |
| public String toString() { |
| return repositoryMapping.toString(); |
| } |
| |
| /** {@link com.google.devtools.build.skyframe.SkyKey} for {@link RepositoryMappingValue}. */ |
| @AutoCodec.VisibleForSerialization |
| @AutoCodec |
| static class Key extends AbstractSkyKey<RepositoryName> { |
| |
| private static final Interner<Key> interner = BlazeInterners.newWeakInterner(); |
| |
| private Key(RepositoryName arg) { |
| super(arg); |
| } |
| |
| @AutoCodec.VisibleForSerialization |
| @AutoCodec.Instantiator |
| static Key create(RepositoryName arg) { |
| return interner.intern(new Key(arg)); |
| } |
| |
| @Override |
| public SkyFunctionName functionName() { |
| return SkyFunctions.REPOSITORY_MAPPING; |
| } |
| } |
| } |