com.facebook.buck.artifact_cache.InMemoryArtifactCache.java Source code

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Here is the source code for com.facebook.buck.artifact_cache.InMemoryArtifactCache.java

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/*
 * Copyright 2015-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.artifact_cache;

import com.facebook.buck.io.BorrowablePath;
import com.facebook.buck.io.LazyPath;
import com.facebook.buck.rules.RuleKey;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.common.io.ByteStreams;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.util.Map;

public class InMemoryArtifactCache implements ArtifactCache {

    private final Map<RuleKey, Artifact> artifacts = Maps.newConcurrentMap();

    public int getArtifactCount() {
        return artifacts.size();
    }

    public boolean hasArtifact(RuleKey ruleKey) {
        return artifacts.containsKey(ruleKey);
    }

    @Override
    public CacheResult fetch(RuleKey ruleKey, LazyPath output) {
        Artifact artifact = artifacts.get(ruleKey);
        if (artifact == null) {
            return CacheResult.miss();
        }
        try {
            Files.write(output.get(), artifact.data);
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }
        return CacheResult.hit("in-memory", artifact.metadata, artifact.data.length);
    }

    public void store(ArtifactInfo info, byte[] data) {
        Artifact artifact = new Artifact();
        artifact.metadata = info.getMetadata();
        artifact.data = data;
        for (RuleKey ruleKey : info.getRuleKeys()) {
            artifacts.put(ruleKey, artifact);
        }
    }

    @Override
    public ListenableFuture<Void> store(ArtifactInfo info, BorrowablePath output) {
        try (InputStream inputStream = Files.newInputStream(output.getPath())) {
            store(info, ByteStreams.toByteArray(inputStream));
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }

        return Futures.immediateFuture(null);
    }

    @Override
    public boolean isStoreSupported() {
        return true;
    }

    @Override
    public void close() {
    }

    public boolean isEmpty() {
        return artifacts.isEmpty();
    }

    public class Artifact {
        public ImmutableMap<String, String> metadata;
        public byte[] data;
    }

}