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// Copyright 2015 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.analysis;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.RunfilesSupplier;
import com.google.devtools.build.lib.analysis.config.BuildConfigurationValue.RunfileSymlinksMode;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.lang.ref.SoftReference;
import java.util.Map;
import java.util.function.Supplier;
import javax.annotation.Nullable;
/** {@link RunfilesSupplier} implementation wrapping a single {@link Runfiles} directory mapping. */
@AutoCodec
public final class SingleRunfilesSupplier implements RunfilesSupplier {
private final PathFragment runfilesDir;
private final Runfiles runfiles;
private final Supplier<Map<PathFragment, Artifact>> runfilesInputs;
@Nullable private final Artifact repoMappingManifest;
private final RunfileSymlinksMode runfileSymlinksMode;
private final boolean buildRunfileLinks;
/**
* Same as {@link SingleRunfilesSupplier#SingleRunfilesSupplier(PathFragment, Runfiles, boolean,
* Artifact, RunfileSymlinksMode, boolean)}, except adds caching for {@linkplain
* Runfiles#getRunfilesInputs runfiles inputs}.
*
* <p>The runfiles inputs are computed lazily and softly cached. Caching is shared across
* instances created via {@link #withOverriddenRunfilesDir}.
*/
public static SingleRunfilesSupplier createCaching(
PathFragment runfilesDir,
Runfiles runfiles,
@Nullable Artifact repoMappingManifest,
RunfileSymlinksMode runfileSymlinksMode,
boolean buildRunfileLinks) {
return new SingleRunfilesSupplier(
runfilesDir,
runfiles,
/* runfilesCachingEnabled= */ true,
repoMappingManifest,
runfileSymlinksMode,
buildRunfileLinks);
}
/**
* Create an instance mapping {@code runfiles} to {@code runfilesDir}.
*
* @param runfilesDir the desired runfiles directory. Should be relative.
* @param runfiles the runfiles for runilesDir.
* @param runfileSymlinksMode how to create runfile symlinks
* @param buildRunfileLinks whether runfile symlinks should be created during the build
*/
@AutoCodec.Instantiator
public SingleRunfilesSupplier(
PathFragment runfilesDir,
Runfiles runfiles,
@Nullable Artifact repoMappingManifest,
RunfileSymlinksMode runfileSymlinksMode,
boolean buildRunfileLinks) {
this(
runfilesDir,
runfiles,
/* runfilesCachingEnabled= */ false,
repoMappingManifest,
runfileSymlinksMode,
buildRunfileLinks);
}
private SingleRunfilesSupplier(
PathFragment runfilesDir,
Runfiles runfiles,
boolean runfilesCachingEnabled,
@Nullable Artifact repoMappingManifest,
RunfileSymlinksMode runfileSymlinksMode,
boolean buildRunfileLinks) {
this(
runfilesDir,
runfiles,
runfilesCachingEnabled
? new RunfilesCacher(runfiles, repoMappingManifest)
: () ->
runfiles.getRunfilesInputs(
/* eventHandler= */ null, /* location= */ null, repoMappingManifest),
repoMappingManifest,
runfileSymlinksMode,
buildRunfileLinks);
}
private SingleRunfilesSupplier(
PathFragment runfilesDir,
Runfiles runfiles,
Supplier<Map<PathFragment, Artifact>> runfilesInputs,
@Nullable Artifact repoMappingManifest,
RunfileSymlinksMode runfileSymlinksMode,
boolean buildRunfileLinks) {
checkArgument(!runfilesDir.isAbsolute());
this.runfilesDir = checkNotNull(runfilesDir);
this.runfiles = checkNotNull(runfiles);
this.runfilesInputs = checkNotNull(runfilesInputs);
this.repoMappingManifest = repoMappingManifest;
this.runfileSymlinksMode = runfileSymlinksMode;
this.buildRunfileLinks = buildRunfileLinks;
}
@Override
public NestedSet<Artifact> getArtifacts() {
return runfiles.getAllArtifacts();
}
@Override
public ImmutableSet<PathFragment> getRunfilesDirs() {
return ImmutableSet.of(runfilesDir);
}
@Override
public ImmutableMap<PathFragment, Map<PathFragment, Artifact>> getMappings() {
return ImmutableMap.of(runfilesDir, runfilesInputs.get());
}
@Override
@Nullable
public RunfileSymlinksMode getRunfileSymlinksMode(PathFragment runfilesDir) {
if (this.runfilesDir.equals(runfilesDir)) {
return runfileSymlinksMode;
}
return null;
}
@Override
public boolean isBuildRunfileLinks(PathFragment runfilesDir) {
return buildRunfileLinks && this.runfilesDir.equals(runfilesDir);
}
@Override
public SingleRunfilesSupplier withOverriddenRunfilesDir(PathFragment newRunfilesDir) {
return newRunfilesDir.equals(runfilesDir)
? this
: new SingleRunfilesSupplier(
newRunfilesDir,
runfiles,
runfilesInputs,
repoMappingManifest,
runfileSymlinksMode,
buildRunfileLinks);
}
/** Softly caches the result of {@link Runfiles#getRunfilesInputs}. */
private static final class RunfilesCacher implements Supplier<Map<PathFragment, Artifact>> {
private final Runfiles runfiles;
@Nullable private final Artifact repoMappingManifest;
private volatile SoftReference<Map<PathFragment, Artifact>> ref = new SoftReference<>(null);
RunfilesCacher(Runfiles runfiles, @Nullable Artifact repoMappingManifest) {
this.runfiles = runfiles;
this.repoMappingManifest = repoMappingManifest;
}
@Override
public Map<PathFragment, Artifact> get() {
Map<PathFragment, Artifact> result = ref.get();
if (result != null) {
return result;
}
synchronized (this) {
result = ref.get();
if (result == null) {
result =
runfiles.getRunfilesInputs(
/*eventHandler=*/ null, /*location=*/ null, repoMappingManifest);
ref = new SoftReference<>(result);
}
}
return result;
}
}
}