com.facebook.buck.rules.keys.InputCountingRuleKeyFactory.java Source code

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Here is the source code for com.facebook.buck.rules.keys.InputCountingRuleKeyFactory.java

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/*
 * Copyright 2016-present Facebook, Inc.
 *
 * 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.facebook.buck.rules.keys;

import com.facebook.buck.hashing.FileHashLoader;
import com.facebook.buck.io.ArchiveMemberPath;
import com.facebook.buck.rules.BuildRule;
import com.facebook.buck.rules.RuleKeyAppendable;
import com.facebook.buck.rules.RuleKeyBuilder;
import com.facebook.buck.rules.SourcePath;
import com.facebook.buck.rules.SourcePathResolver;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;

import java.io.IOException;
import java.nio.file.Path;

import javax.annotation.Nonnull;

public class InputCountingRuleKeyFactory extends
        ReflectiveRuleKeyFactory<RuleKeyBuilder<InputCountingRuleKeyFactory.Result>, InputCountingRuleKeyFactory.Result> {

    protected final LoadingCache<RuleKeyAppendable, InputCountingRuleKeyFactory.Result> resultCache;
    private final FileHashLoader hashLoader;
    private final SourcePathResolver pathResolver;

    public InputCountingRuleKeyFactory(int seed, FileHashLoader hashLoader, SourcePathResolver pathResolver) {
        super(seed);
        this.resultCache = CacheBuilder.newBuilder().weakKeys()
                .build(new CacheLoader<RuleKeyAppendable, InputCountingRuleKeyFactory.Result>() {
                    @Override
                    public InputCountingRuleKeyFactory.Result load(@Nonnull RuleKeyAppendable appendable)
                            throws Exception {
                        RuleKeyBuilder<InputCountingRuleKeyFactory.Result> subKeyBuilder = newBuilder();
                        appendable.appendToRuleKey(subKeyBuilder);
                        return subKeyBuilder.build();
                    }
                });
        this.hashLoader = hashLoader;
        this.pathResolver = pathResolver;
    }

    private RuleKeyBuilder<InputCountingRuleKeyFactory.Result> newBuilder() {
        return new RuleKeyBuilder<InputCountingRuleKeyFactory.Result>(pathResolver, hashLoader) {

            private int inputsCount;
            private long inputsSize;
            private ImmutableSet.Builder<Path> paths = ImmutableSet.builder();
            private ImmutableSet.Builder<SourcePath> sourcePaths = ImmutableSet.builder();

            @Override
            protected RuleKeyBuilder<InputCountingRuleKeyFactory.Result> setBuildRule(BuildRule rule) {
                // Ignore build rules, if the rule is used as an input it will be a SourcePath
                return this;
            }

            @Override
            public RuleKeyBuilder<InputCountingRuleKeyFactory.Result> setAppendableRuleKey(String key,
                    RuleKeyAppendable appendable) {
                InputCountingRuleKeyFactory.Result result = resultCache.getUnchecked(appendable);
                inputsCount += result.getInputsCount();
                inputsSize += result.getInputsSize();
                return this;
            }

            @Override
            protected RuleKeyBuilder<Result> setNonHashingSourcePath(SourcePath sourcePath) {
                sourcePaths.add(sourcePath);
                return this;
            }

            @Override
            protected RuleKeyBuilder<Result> setSourcePath(SourcePath sourcePath) {
                sourcePaths.add(sourcePath);
                return this;
            }

            @Override
            public RuleKeyBuilder<Result> setPath(Path absolutePath, Path ideallyRelative) throws IOException {
                paths.add(absolutePath);
                return this;
            }

            @Override
            public RuleKeyBuilder<Result> setArchiveMemberPath(ArchiveMemberPath absoluteArchiveMemberPath,
                    ArchiveMemberPath relativeArchiveMemberPath) throws IOException {
                paths.add(absoluteArchiveMemberPath.getArchivePath());
                return this;
            }

            @Override
            public InputCountingRuleKeyFactory.Result build() {
                try {
                    for (Path path : Iterables.concat(paths.build(),
                            pathResolver.getAllAbsolutePaths(sourcePaths.build()))) {
                        inputsCount += 1;
                        inputsSize += hashLoader.getSize(path);
                    }
                } catch (IOException e) {
                    throw new WrappedIoException(e);
                }
                return new Result(inputsCount, inputsSize);
            }
        };
    }

    @Override
    protected RuleKeyBuilder<InputCountingRuleKeyFactory.Result> newBuilder(BuildRule rule) {
        return newBuilder();
    }

    public static class Result {

        private final int inputsCount;
        private final long inputsSize;

        public Result(int inputsCount, long inputsSize) {
            this.inputsCount = inputsCount;
            this.inputsSize = inputsSize;
        }

        public int getInputsCount() {
            return inputsCount;
        }

        public long getInputsSize() {
            return inputsSize;
        }

    }

    public static class WrappedIoException extends RuntimeException {

        public WrappedIoException(Exception e) {
            super(e);
        }

    }

}