| // 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); |
| } |
| } |
| } |