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// 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.base.Preconditions;
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.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);
}
}
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