| // 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.Interner; |
| import com.google.common.collect.Interners; |
| import com.google.common.io.BaseEncoding; |
| import com.google.devtools.build.lib.actions.ActionInput; |
| import com.google.devtools.build.lib.actions.ActionInputFileCache; |
| import com.google.devtools.build.lib.actions.Artifact; |
| import com.google.devtools.build.lib.util.Preconditions; |
| import com.google.devtools.build.lib.vfs.Path; |
| import com.google.protobuf.ByteString; |
| |
| import java.io.IOException; |
| import java.nio.charset.StandardCharsets; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import javax.annotation.Nullable; |
| |
| /** |
| * Cache provided by an {@link ActionExecutionFunction}, allowing Blaze to obtain artifact metadata |
| * from the graph. |
| * |
| * <p>Data for the action's inputs is injected into this cache on construction, using the graph as |
| * the source of truth. |
| */ |
| class PerActionFileCache implements ActionInputFileCache { |
| private final Map<Artifact, FileArtifactValue> inputArtifactData; |
| // Populated lazily, on calls to #getDigest. |
| private final Map<ByteString, Artifact> reverseMap = new ConcurrentHashMap<>(); |
| |
| private static final Interner<ByteString> BYTE_INTERNER = Interners.newWeakInterner(); |
| |
| /** |
| * @param inputArtifactData Map from artifact to metadata, used to return metadata upon request. |
| */ |
| PerActionFileCache(Map<Artifact, FileArtifactValue> inputArtifactData) { |
| this.inputArtifactData = Preconditions.checkNotNull(inputArtifactData); |
| } |
| |
| @Nullable |
| private FileArtifactValue getInputFileArtifactValue(ActionInput input) { |
| if (!(input instanceof Artifact)) { |
| return null; |
| } |
| return Preconditions.checkNotNull(inputArtifactData.get(input), input); |
| } |
| |
| @Override |
| public long getSizeInBytes(ActionInput input) throws IOException { |
| FileArtifactValue metadata = getInputFileArtifactValue(input); |
| if (metadata != null) { |
| return metadata.getSize(); |
| } |
| return -1; |
| } |
| |
| @Nullable |
| @Override |
| public Artifact getInputFromDigest(ByteString digest) throws IOException { |
| return reverseMap.get(digest); |
| } |
| |
| @Override |
| public Path getInputPath(ActionInput input) { |
| return ((Artifact) input).getPath(); |
| } |
| |
| @Nullable |
| @Override |
| public ByteString getDigest(ActionInput input) throws IOException { |
| FileArtifactValue value = getInputFileArtifactValue(input); |
| if (value != null) { |
| byte[] bytes = value.getDigest(); |
| if (bytes != null) { |
| ByteString digest = ByteString.copyFrom(BaseEncoding.base16().lowerCase().encode(bytes) |
| .getBytes(StandardCharsets.US_ASCII)); |
| reverseMap.put(BYTE_INTERNER.intern(digest), (Artifact) input); |
| return digest; |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| public boolean isFile(Artifact input) { |
| // getInputArtifactValue always returns a value when supplied with an Artifact. |
| return getInputFileArtifactValue(input).isFile(); |
| } |
| |
| @Override |
| public boolean contentsAvailableLocally(ByteString digest) { |
| return reverseMap.containsKey(digest); |
| } |
| } |