com.google.devtools.build.lib.skyframe.TargetPatternFunction.java Source code

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Here is the source code for com.google.devtools.build.lib.skyframe.TargetPatternFunction.java

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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.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.cmdline.ResolvedTargets;
import com.google.devtools.build.lib.cmdline.TargetParsingException;
import com.google.devtools.build.lib.cmdline.TargetPattern;
import com.google.devtools.build.lib.collect.CompactHashSet;
import com.google.devtools.build.lib.concurrent.MultisetSemaphore;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.skyframe.EnvironmentBackedRecursivePackageProvider.MissingDepException;
import com.google.devtools.build.lib.util.BatchCallback;
import com.google.devtools.build.lib.util.Preconditions;
import com.google.devtools.build.lib.vfs.PathFragment;
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.util.Set;
import javax.annotation.Nullable;

/**
 * TargetPatternFunction translates a target pattern (eg, "foo/...") into a set of resolved
 * Targets.
 */
public class TargetPatternFunction implements SkyFunction {

    public TargetPatternFunction() {
    }

    @Override
    public SkyValue compute(SkyKey key, Environment env)
            throws TargetPatternFunctionException, InterruptedException {
        TargetPatternValue.TargetPatternKey patternKey = ((TargetPatternValue.TargetPatternKey) key.argument());
        ResolvedTargets<Target> resolvedTargets;
        try {
            EnvironmentBackedRecursivePackageProvider provider = new EnvironmentBackedRecursivePackageProvider(env);
            RecursivePackageProviderBackedTargetPatternResolver resolver = new RecursivePackageProviderBackedTargetPatternResolver(
                    provider, env.getListener(), patternKey.getPolicy(),
                    MultisetSemaphore.<PackageIdentifier>unbounded());
            TargetPattern parsedPattern = patternKey.getParsedPattern();
            ImmutableSet<PathFragment> excludedSubdirectories = patternKey.getExcludedSubdirectories();
            final Set<Target> results = CompactHashSet.create();
            BatchCallback<Target, RuntimeException> callback = new BatchCallback<Target, RuntimeException>() {
                @Override
                public void process(Iterable<Target> partialResult) {
                    Iterables.addAll(results, partialResult);
                }
            };
            parsedPattern.eval(resolver, excludedSubdirectories, callback, RuntimeException.class);
            resolvedTargets = ResolvedTargets.<Target>builder().addAll(results).build();
        } catch (TargetParsingException e) {
            throw new TargetPatternFunctionException(e);
        } catch (MissingDepException e) {
            // The EnvironmentBackedRecursivePackageProvider constructed above might throw
            // MissingDepException to signal when it has a dependency on a missing Environment value.
            // Note that MissingDepException extends RuntimeException because the methods called
            // on EnvironmentBackedRecursivePackageProvider all belong to an interface shared with other
            // implementations that are unconcerned with MissingDepExceptions.
            return null;
        }
        Preconditions.checkNotNull(resolvedTargets, key);
        ResolvedTargets.Builder<Label> resolvedLabelsBuilder = ResolvedTargets.builder();
        for (Target target : resolvedTargets.getTargets()) {
            resolvedLabelsBuilder.add(target.getLabel());
        }
        for (Target target : resolvedTargets.getFilteredTargets()) {
            resolvedLabelsBuilder.remove(target.getLabel());
        }
        return new TargetPatternValue(resolvedLabelsBuilder.build());
    }

    @Nullable
    @Override
    public String extractTag(SkyKey skyKey) {
        return null;
    }

    /**
     * Used to declare all the exception types that can be wrapped in the exception thrown by
     * {@link TargetPatternFunction#compute}.
     */
    private static final class TargetPatternFunctionException extends SkyFunctionException {
        public TargetPatternFunctionException(TargetParsingException e) {
            super(e, Transience.PERSISTENT);
        }
    }
}