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// Copyright 2014 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.Supplier;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration.Fragment;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.ConfigurationEnvironment;
import com.google.devtools.build.lib.analysis.config.ConfigurationFragmentFactory;
import com.google.devtools.build.lib.analysis.config.InvalidConfigurationException;
import com.google.devtools.build.lib.analysis.config.PackageProviderForConfigurations;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.LabelSyntaxException;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.packages.RuleClassProvider;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.skyframe.ConfigurationFragmentValue.ConfigurationFragmentKey;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;
/**
* A builder for {@link ConfigurationFragmentValue}s.
*/
public final class ConfigurationFragmentFunction implements SkyFunction {
private final Supplier<ImmutableList<ConfigurationFragmentFactory>> configurationFragments;
private final RuleClassProvider ruleClassProvider;
public ConfigurationFragmentFunction(
Supplier<ImmutableList<ConfigurationFragmentFactory>> configurationFragments,
RuleClassProvider ruleClassProvider) {
this.configurationFragments = configurationFragments;
this.ruleClassProvider = ruleClassProvider;
}
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws InterruptedException,
ConfigurationFragmentFunctionException {
ConfigurationFragmentKey configurationFragmentKey =
(ConfigurationFragmentKey) skyKey.argument();
BuildOptions buildOptions = configurationFragmentKey.getBuildOptions();
ConfigurationFragmentFactory factory = getFactory(configurationFragmentKey.getFragmentType());
try {
PackageProviderForConfigurations packageProvider =
new SkyframePackageLoaderWithValueEnvironment(env, ruleClassProvider);
ConfigurationEnvironment confEnv = new ConfigurationBuilderEnvironment(packageProvider);
Fragment fragment = factory.create(confEnv, buildOptions);
if (env.valuesMissing()) {
return null;
}
return new ConfigurationFragmentValue(fragment);
} catch (InvalidConfigurationException e) {
// TODO(bazel-team): Rework the control-flow here so that we're not actually throwing this
// exception with missing Skyframe dependencies.
if (env.valuesMissing()) {
return null;
}
throw new ConfigurationFragmentFunctionException(e);
}
}
private ConfigurationFragmentFactory getFactory(Class<? extends Fragment> fragmentType) {
for (ConfigurationFragmentFactory factory : configurationFragments.get()) {
if (factory.creates().equals(fragmentType)) {
return factory;
}
}
throw new IllegalStateException(
"There is no factory for fragment: " + fragmentType.getSimpleName());
}
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
/**
* A {@link ConfigurationEnvironment} implementation that can create dependencies on files.
*/
private static final class ConfigurationBuilderEnvironment implements ConfigurationEnvironment {
private final PackageProviderForConfigurations packageProvider;
ConfigurationBuilderEnvironment(PackageProviderForConfigurations packageProvider) {
this.packageProvider = packageProvider;
}
@Override
public Target getTarget(Label label)
throws NoSuchPackageException, NoSuchTargetException, InterruptedException {
return packageProvider.getTarget(label);
}
@Override
public Path getPath(Package pkg, String fileName) throws InterruptedException {
Path result = pkg.getPackageDirectory().getRelative(fileName);
try {
packageProvider.addDependency(pkg, fileName);
} catch (IOException | LabelSyntaxException e) {
return null;
}
return result;
}
@Override
public <T extends Fragment> T getFragment(BuildOptions buildOptions, Class<T> fragmentType)
throws InvalidConfigurationException, InterruptedException {
return packageProvider.getFragment(buildOptions, fragmentType);
}
}
/**
* Used to declare all the exception types that can be wrapped in the exception thrown by
* {@link ConfigurationFragmentFunction#compute}.
*/
private static final class ConfigurationFragmentFunctionException extends SkyFunctionException {
public ConfigurationFragmentFunctionException(InvalidConfigurationException e) {
super(e, Transience.PERSISTENT);
}
}
}
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