com.facebook.buck.rules.RuleDepsCache.java Source code

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Here is the source code for com.facebook.buck.rules.RuleDepsCache.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;

import com.facebook.buck.model.BuildTarget;
import com.google.common.base.Throwables;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;

import java.util.concurrent.ExecutionException;

/**
 * A "loading cache" of rule deps futures.
 *
 * Not a mere LoadingCache since the key is a build target but the loader uses a build rule.
 */
public class RuleDepsCache {
    private final ListeningExecutorService service;
    private final SourcePathRuleFinder ruleFinder;
    private final Cache<BuildTarget, ListenableFuture<ImmutableSortedSet<BuildRule>>> cache;

    public RuleDepsCache(ListeningExecutorService service, SourcePathRuleFinder ruleFinder) {
        this.service = service;
        this.ruleFinder = ruleFinder;
        this.cache = CacheBuilder.newBuilder().build();
    }

    public ListenableFuture<ImmutableSortedSet<BuildRule>> get(final BuildRule rule) {
        try {
            return cache.get(rule.getBuildTarget(), () -> service.submit(() -> {
                ImmutableSortedSet.Builder<BuildRule> deps = ImmutableSortedSet.naturalOrder();
                deps.addAll(rule.getDeps());
                if (rule instanceof HasRuntimeDeps) {
                    deps.addAll(ruleFinder.filterBuildRuleInputs(((HasRuntimeDeps) rule).getRuntimeDeps()));
                }
                return deps.build();
            }));
        } catch (ExecutionException e) {
            // service.submit doesn't throw any checked exceptions, so this should be fine.
            throw Throwables.propagate(e.getCause());
        }
    }
}