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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.skyframe;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.Interner;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.FragmentClassSet;
import com.google.devtools.build.lib.concurrent.BlazeInterners;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.skyframe.serialization.InjectingObjectCodec;
import com.google.devtools.build.lib.skyframe.serialization.ObjectCodec;
import com.google.devtools.build.lib.skyframe.serialization.SerializationException;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.skyframe.serialization.strings.StringCodecs;
import com.google.devtools.build.lib.vfs.FileSystemProvider;
import com.google.devtools.build.skyframe.SkyFunctionName;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.CodedOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.util.Objects;
import java.util.Set;
/** A Skyframe value representing a {@link BuildConfiguration}. */
// TODO(bazel-team): mark this immutable when BuildConfiguration is immutable.
// @Immutable
@AutoCodec(dependency = FileSystemProvider.class)
@ThreadSafe
public class BuildConfigurationValue implements SkyValue {
public static final InjectingObjectCodec<BuildConfigurationValue, FileSystemProvider> CODEC =
new BuildConfigurationValue_AutoCodec();
private static final Interner<Key> keyInterner = BlazeInterners.newWeakInterner();
private final BuildConfiguration configuration;
BuildConfigurationValue(BuildConfiguration configuration) {
this.configuration = configuration;
}
public BuildConfiguration getConfiguration() {
return configuration;
}
/**
* Returns the key for a requested configuration.
*
* @param fragments the fragments the configuration should contain
* @param buildOptions the build options the fragments should be built from
*/
@ThreadSafe
public static Key key(
Set<Class<? extends BuildConfiguration.Fragment>> fragments, BuildOptions buildOptions) {
return key(
FragmentClassSet.of(
ImmutableSortedSet.copyOf(BuildConfiguration.lexicalFragmentSorter, fragments)),
buildOptions);
}
public static Key key(FragmentClassSet fragmentClassSet, BuildOptions buildOptions) {
return keyInterner.intern(new Key(fragmentClassSet, buildOptions));
}
static final class Key implements SkyKey, Serializable {
private final FragmentClassSet fragments;
private final BuildOptions buildOptions;
// If hashCode really is -1, we'll recompute it from scratch each time. Oh well.
private volatile int hashCode = -1;
private Key(FragmentClassSet fragments, BuildOptions buildOptions) {
this.fragments = fragments;
this.buildOptions = Preconditions.checkNotNull(buildOptions);
}
ImmutableSortedSet<Class<? extends BuildConfiguration.Fragment>> getFragments() {
return fragments.fragmentClasses();
}
BuildOptions getBuildOptions() {
return buildOptions;
}
@Override
public SkyFunctionName functionName() {
return SkyFunctions.BUILD_CONFIGURATION;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof Key)) {
return false;
}
Key otherConfig = (Key) o;
return buildOptions.equals(otherConfig.buildOptions)
&& Objects.equals(fragments, otherConfig.fragments);
}
@Override
public int hashCode() {
if (hashCode == -1) {
hashCode = Objects.hash(fragments, buildOptions);
}
return hashCode;
}
private static class Codec implements ObjectCodec<Key> {
@Override
public Class<Key> getEncodedClass() {
return Key.class;
}
@Override
public void serialize(Key obj, CodedOutputStream codedOut)
throws SerializationException, IOException {
BuildOptions.CODEC.serialize(obj.buildOptions, codedOut);
codedOut.writeInt32NoTag(obj.fragments.fragmentClasses().size());
for (Class<? extends BuildConfiguration.Fragment> fragment :
obj.fragments.fragmentClasses()) {
StringCodecs.asciiOptimized().serialize(fragment.getName(), codedOut);
}
}
@Override
@SuppressWarnings("unchecked") // Class<? extends...> cast
public Key deserialize(CodedInputStream codedIn) throws SerializationException, IOException {
BuildOptions buildOptions = BuildOptions.CODEC.deserialize(codedIn);
int fragmentsSize = codedIn.readInt32();
ImmutableSortedSet.Builder<Class<? extends BuildConfiguration.Fragment>> fragmentsBuilder =
ImmutableSortedSet.orderedBy(BuildConfiguration.lexicalFragmentSorter);
for (int i = 0; i < fragmentsSize; i++) {
try {
fragmentsBuilder.add(
(Class<? extends BuildConfiguration.Fragment>)
Class.forName(StringCodecs.asciiOptimized().deserialize(codedIn)));
} catch (ClassNotFoundException e) {
throw new SerializationException(
"Couldn't deserialize BuildConfigurationValue$Key fragment class", e);
}
}
return key(fragmentsBuilder.build(), buildOptions);
}
}
}
}
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