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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.analysis.config;
import com.google.common.cache.Cache;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.analysis.ConfigurationCollectionFactory;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration.Fragment;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadCompatible;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.util.Preconditions;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
/**
* A factory class for {@link BuildConfiguration} instances. This is unfortunately more complex,
* and should be simplified in the future, if
* possible. Right now, creating a {@link BuildConfiguration} instance involves
* creating the instance itself and the related configurations; the main method
* is {@link #createConfigurations}.
*
* <p>Avoid calling into this class, and instead use the skyframe infrastructure to obtain
* configuration instances.
*
* <p>Blaze currently relies on the fact that all {@link BuildConfiguration}
* instances used in a build can be constructed ahead of time by this class.
*/
@ThreadCompatible // safe as long as separate instances are used
public final class ConfigurationFactory {
private final List<ConfigurationFragmentFactory> configurationFragmentFactories;
private final ConfigurationCollectionFactory configurationCollectionFactory;
public ConfigurationFactory(
ConfigurationCollectionFactory configurationCollectionFactory,
ConfigurationFragmentFactory... fragmentFactories) {
this(configurationCollectionFactory, ImmutableList.copyOf(fragmentFactories));
}
public ConfigurationFactory(
ConfigurationCollectionFactory configurationCollectionFactory,
List<ConfigurationFragmentFactory> fragmentFactories) {
this.configurationCollectionFactory =
Preconditions.checkNotNull(configurationCollectionFactory);
this.configurationFragmentFactories = ImmutableList.copyOf(fragmentFactories);
}
/**
* Creates a set of build configurations with top-level configuration having the given options.
*
* <p>The rest of the configurations are created based on the set of transitions available.
*/
@Nullable
public BuildConfiguration createConfigurations(
Cache<String, BuildConfiguration> cache,
PackageProviderForConfigurations loadedPackageProvider, BuildOptions buildOptions,
EventHandler errorEventListener)
throws InvalidConfigurationException {
return configurationCollectionFactory.createConfigurations(this, cache,
loadedPackageProvider, buildOptions, errorEventListener);
}
/**
* Returns a {@link com.google.devtools.build.lib.analysis.config.BuildConfiguration} based on
* the given set of build options.
*
* <p>If the configuration has already been created, re-uses it, otherwise, creates a new one.
*/
@Nullable
public BuildConfiguration getConfiguration(PackageProviderForConfigurations loadedPackageProvider,
BuildOptions buildOptions, boolean actionsDisabled, Cache<String, BuildConfiguration> cache)
throws InvalidConfigurationException {
String cacheKey = buildOptions.computeCacheKey();
BuildConfiguration result = cache.getIfPresent(cacheKey);
if (result != null) {
return result;
}
Map<Class<? extends Fragment>, Fragment> fragments = new HashMap<>();
// Create configuration fragments
for (ConfigurationFragmentFactory factory : configurationFragmentFactories) {
Class<? extends Fragment> fragmentType = factory.creates();
Fragment fragment = loadedPackageProvider.getFragment(buildOptions, fragmentType);
if (fragment != null && fragments.get(fragment.getClass()) == null) {
fragments.put(fragment.getClass(), fragment);
}
}
BlazeDirectories directories = loadedPackageProvider.getDirectories();
if (loadedPackageProvider.valuesMissing()) {
return null;
}
result = new BuildConfiguration(directories, fragments, buildOptions, actionsDisabled);
cache.put(cacheKey, result);
return result;
}
public List<ConfigurationFragmentFactory> getFactories() {
return configurationFragmentFactories;
}
}
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