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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 static com.google.devtools.build.lib.analysis.config.BuildConfiguration.Fragment;
import com.google.common.collect.ClassToInstanceMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.MutableClassToInstanceMap;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.analysis.ConfigurationCollectionFactory;
import com.google.devtools.build.lib.analysis.ConfiguredRuleClassProvider;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.config.InvalidConfigurationException;
import com.google.devtools.build.lib.packages.RuleClassProvider;
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 com.google.devtools.build.skyframe.ValueOrException;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
/**
* A builder for {@link BuildConfigurationValue} instances.
*/
public class BuildConfigurationFunction implements SkyFunction {
private final BlazeDirectories directories;
private final RuleClassProvider ruleClassProvider;
private final ConfigurationCollectionFactory collectionFactory;
public BuildConfigurationFunction(BlazeDirectories directories,
RuleClassProvider ruleClassProvider) {
this.directories = directories;
this.ruleClassProvider = ruleClassProvider;
collectionFactory =
((ConfiguredRuleClassProvider) ruleClassProvider).getConfigurationCollectionFactory();
}
@Override
public SkyValue compute(SkyKey skyKey, Environment env)
throws InterruptedException, BuildConfigurationFunctionException {
WorkspaceNameValue workspaceNameValue = (WorkspaceNameValue) env
.getValue(WorkspaceNameValue.key());
if (workspaceNameValue == null) {
return null;
}
BuildConfigurationValue.Key key = (BuildConfigurationValue.Key) skyKey.argument();
Set<Fragment> fragments;
try {
fragments = getConfigurationFragments(key, env);
} catch (InvalidConfigurationException e) {
throw new BuildConfigurationFunctionException(e);
}
if (fragments == null) {
return null;
}
ClassToInstanceMap<Fragment> fragmentsMap = MutableClassToInstanceMap.create();
for (Fragment fragment : fragments) {
fragmentsMap.put(fragment.getClass(), fragment);
}
BuildConfiguration config = new BuildConfiguration(directories, fragmentsMap,
key.getBuildOptions(), !key.actionsEnabled(), workspaceNameValue.getName());
// Unlike static configurations, dynamic configurations don't need to embed transition logic
// within the configuration itself. However we still use this interface to provide a mapping
// between Transition types (e.g. HOST) and the dynamic transitions that apply those
// transitions. Once static configurations are cleaned out we won't need this interface
// any more (all the centralized logic that maintains the transition logic can be distributed
// to the actual rule code that uses it).
config.setConfigurationTransitions(collectionFactory.getDynamicTransitionLogic(config));
return new BuildConfigurationValue(config);
}
private Set<Fragment> getConfigurationFragments(BuildConfigurationValue.Key key, Environment env)
throws InvalidConfigurationException, InterruptedException {
// Get SkyKeys for the fragments we need to load.
Set<SkyKey> fragmentKeys = new LinkedHashSet<>();
for (Class<? extends BuildConfiguration.Fragment> fragmentClass : key.getFragments()) {
fragmentKeys.add(
ConfigurationFragmentValue.key(key.getBuildOptions(), fragmentClass, ruleClassProvider));
}
// Load them as Skyframe deps.
Map<SkyKey, ValueOrException<InvalidConfigurationException>> fragmentDeps =
env.getValuesOrThrow(fragmentKeys, InvalidConfigurationException.class);
if (env.valuesMissing()) {
return null;
}
// Collect and return the results.
ImmutableSet.Builder<Fragment> fragments = ImmutableSet.builder();
for (ValueOrException<InvalidConfigurationException> value : fragmentDeps.values()) {
BuildConfiguration.Fragment fragment =
((ConfigurationFragmentValue) value.get()).getFragment();
if (fragment != null) {
fragments.add(fragment);
}
}
return fragments.build();
}
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
private static final class BuildConfigurationFunctionException extends SkyFunctionException {
public BuildConfigurationFunctionException(InvalidConfigurationException e) {
super(e, Transience.PERSISTENT);
}
}
}
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