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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.devtools.build.lib.actions.FileStateValue;
import com.google.devtools.build.lib.util.io.TimestampGranularityMonitor;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicReference;
/**
* A {@link SkyFunction} for {@link FileStateValue}s.
*
* <p>Merely calls FileStateValue#create, but also has special handling for files outside the
* package roots (see {@link ExternalFilesHelper}).
*/
public class FileStateFunction implements SkyFunction {
private final AtomicReference<TimestampGranularityMonitor> tsgm;
private final ExternalFilesHelper externalFilesHelper;
public FileStateFunction(AtomicReference<TimestampGranularityMonitor> tsgm,
ExternalFilesHelper externalFilesHelper) {
this.tsgm = tsgm;
this.externalFilesHelper = externalFilesHelper;
}
@Override
public SkyValue compute(SkyKey skyKey, Environment env)
throws FileStateFunctionException, InterruptedException {
RootedPath rootedPath = (RootedPath) skyKey.argument();
try {
externalFilesHelper.maybeHandleExternalFile(rootedPath, env);
if (env.valuesMissing()) {
return null;
}
return FileStateValue.create(rootedPath, tsgm.get());
} catch (ExternalFilesHelper.NonexistentImmutableExternalFileException e) {
return FileStateValue.NONEXISTENT_FILE_STATE_NODE;
} catch (IOException e) {
throw new FileStateFunctionException(e);
}
}
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
/**
* Used to declare all the exception types that can be wrapped in the exception thrown by
* {@link FileStateFunction#compute}.
*/
private static final class FileStateFunctionException extends SkyFunctionException {
public FileStateFunctionException(IOException e) {
super(e, Transience.TRANSIENT);
}
}
}
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