com.facebook.buck.distributed.DistBuildCachingEngineDelegate.java Source code

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Here is the source code for com.facebook.buck.distributed.DistBuildCachingEngineDelegate.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.distributed;

import com.facebook.buck.hashing.FileHashLoader;
import com.facebook.buck.io.ProjectFilesystem;
import com.facebook.buck.rules.BuildRule;
import com.facebook.buck.rules.CachingBuildEngineDelegate;
import com.facebook.buck.rules.SourcePathResolver;
import com.facebook.buck.rules.SourcePathRuleFinder;
import com.facebook.buck.rules.keys.DefaultRuleKeyFactory;
import com.facebook.buck.util.cache.FileHashCache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;

import java.util.concurrent.ExecutionException;

import javax.annotation.Nonnull;

/**
 * Implementation of {@link CachingBuildEngineDelegate} for use when building from a state file
 * in distributed build.
 */
public class DistBuildCachingEngineDelegate implements CachingBuildEngineDelegate {
    private final LoadingCache<ProjectFilesystem, FileHashCache> fileHashCacheLoader;
    private final LoadingCache<ProjectFilesystem, DefaultRuleKeyFactory> ruleKeyFactories;

    public DistBuildCachingEngineDelegate(SourcePathResolver sourcePathResolver, SourcePathRuleFinder ruleFinder,
            final DistBuildState remoteState,
            final LoadingCache<ProjectFilesystem, ? extends FileHashLoader> fileHashLoaders) {
        this.fileHashCacheLoader = CacheBuilder.newBuilder()
                .build(new CacheLoader<ProjectFilesystem, FileHashCache>() {
                    @Override
                    public FileHashCache load(@Nonnull ProjectFilesystem filesystem) {
                        return remoteState.createRemoteFileHashCache(filesystem);
                    }
                });
        ruleKeyFactories = DistBuildFileHashes.createRuleKeyFactories(sourcePathResolver, ruleFinder,
                fileHashLoaders, /* keySeed */ 0);
    }

    @Override
    public LoadingCache<ProjectFilesystem, FileHashCache> createFileHashCacheLoader() {
        return fileHashCacheLoader;
    }

    @Override
    public void onRuleAboutToBeBuilt(BuildRule buildRule) {
        try {
            ruleKeyFactories.get(buildRule.getProjectFilesystem()).build(buildRule);
        } catch (ExecutionException e) {
            throw new RuntimeException(e);
        }
    }
}