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// Copyright 2014 Google Inc. 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.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.packages.PackageIdentifier;
import com.google.devtools.build.lib.syntax.Label;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Set;
import javax.annotation.Nullable;
/**
* A <i>transitive</i> target reference that, when built in skyframe, loads the entire
* transitive closure of a target.
*
* This will probably be unnecessary once other refactorings occur throughout the codebase
* which make loading/analysis interleaving more feasible, or we will migrate "blaze query" to
* use this to evaluate its Target graph.
*/
@Immutable
@ThreadSafe
public class TransitiveTargetValue implements SkyValue {
// Non-final for serialization purposes.
private NestedSet<PackageIdentifier> transitiveSuccessfulPkgs;
private NestedSet<PackageIdentifier> transitiveUnsuccessfulPkgs;
private NestedSet<Label> transitiveTargets;
@Nullable private NestedSet<Label> transitiveRootCauses;
@Nullable private NoSuchTargetException errorLoadingTarget;
private TransitiveTargetValue(NestedSet<PackageIdentifier> transitiveSuccessfulPkgs,
NestedSet<PackageIdentifier> transitiveUnsuccessfulPkgs, NestedSet<Label> transitiveTargets,
@Nullable NestedSet<Label> transitiveRootCauses,
@Nullable NoSuchTargetException errorLoadingTarget) {
this.transitiveSuccessfulPkgs = transitiveSuccessfulPkgs;
this.transitiveUnsuccessfulPkgs = transitiveUnsuccessfulPkgs;
this.transitiveTargets = transitiveTargets;
this.transitiveRootCauses = transitiveRootCauses;
this.errorLoadingTarget = errorLoadingTarget;
}
private void writeObject(ObjectOutputStream out) throws IOException {
// It helps to flatten the transitiveSuccessfulPkgs nested set as it has lots of duplicates.
Set<PackageIdentifier> successfulPkgs = transitiveSuccessfulPkgs.toSet();
out.writeInt(successfulPkgs.size());
for (PackageIdentifier pkg : successfulPkgs) {
out.writeObject(pkg);
}
out.writeObject(transitiveUnsuccessfulPkgs);
// Deliberately do not write out transitiveTargets. There is a lot of those and they drive
// serialization costs through the roof, both in terms of space and of time.
// TODO(bazel-team): Deal with this properly once we have efficient serialization of NestedSets.
out.writeObject(transitiveRootCauses);
out.writeObject(errorLoadingTarget);
}
@SuppressWarnings("unchecked")
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
int successfulPkgCount = in.readInt();
NestedSetBuilder<PackageIdentifier> pkgs = NestedSetBuilder.stableOrder();
for (int i = 0; i < successfulPkgCount; i++) {
pkgs.add((PackageIdentifier) in.readObject());
}
transitiveSuccessfulPkgs = pkgs.build();
transitiveUnsuccessfulPkgs = (NestedSet<PackageIdentifier>) in.readObject();
// TODO(bazel-team): Deal with transitiveTargets properly.
transitiveTargets = NestedSetBuilder.emptySet(Order.STABLE_ORDER);
transitiveRootCauses = (NestedSet<Label>) in.readObject();
errorLoadingTarget = (NoSuchTargetException) in.readObject();
}
static TransitiveTargetValue unsuccessfulTransitiveLoading(
NestedSet<PackageIdentifier> transitiveSuccessfulPkgs,
NestedSet<PackageIdentifier> transitiveUnsuccessfulPkgs, NestedSet<Label> transitiveTargets,
NestedSet<Label> rootCauses, @Nullable NoSuchTargetException errorLoadingTarget) {
return new TransitiveTargetValue(transitiveSuccessfulPkgs, transitiveUnsuccessfulPkgs,
transitiveTargets, rootCauses, errorLoadingTarget);
}
static TransitiveTargetValue successfulTransitiveLoading(
NestedSet<PackageIdentifier> transitiveSuccessfulPkgs,
NestedSet<PackageIdentifier> transitiveUnsuccessfulPkgs,
NestedSet<Label> transitiveTargets) {
return new TransitiveTargetValue(transitiveSuccessfulPkgs, transitiveUnsuccessfulPkgs,
transitiveTargets, null, null);
}
/** Returns the error, if any, from loading the target. */
@Nullable
public NoSuchTargetException getErrorLoadingTarget() {
return errorLoadingTarget;
}
/** Returns the packages that were transitively successfully loaded. */
public NestedSet<PackageIdentifier> getTransitiveSuccessfulPackages() {
return transitiveSuccessfulPkgs;
}
/** Returns the packages that were transitively successfully loaded. */
public NestedSet<PackageIdentifier> getTransitiveUnsuccessfulPackages() {
return transitiveUnsuccessfulPkgs;
}
/** Returns the targets that were transitively loaded. */
public NestedSet<Label> getTransitiveTargets() {
return transitiveTargets;
}
/** Returns the root causes, if any, of why targets weren't loaded. */
@Nullable
public NestedSet<Label> getTransitiveRootCauses() {
return transitiveRootCauses;
}
@ThreadSafe
public static SkyKey key(Label label) {
return new SkyKey(SkyFunctions.TRANSITIVE_TARGET, label);
}
}
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