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// Copyright 2015 Google Inc. 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.rules.extra;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.Action;
import com.google.devtools.build.lib.actions.ActionOwner;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.Executor;
import com.google.devtools.build.lib.actions.extra.ExtraActionInfo;
import com.google.devtools.build.lib.analysis.actions.AbstractFileWriteAction;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.util.Fingerprint;
import java.io.IOException;
import java.io.OutputStream;
/**
* Requests extra action info from shadowed action and writes it, in protocol buffer format, to an
* .xa file for use by an extra action. This can only be done at execution time because actions may
* store information only known at execution time into the protocol buffer.
*/
public class ExtraActionInfoFileWriteAction extends AbstractFileWriteAction {
private final Action shadowedAction;
private static final String UUID = "1759f81d-e72e-477d-b182-c4532bdbaeeb";
ExtraActionInfoFileWriteAction(ActionOwner owner, Artifact extraActionInfoFile,
Action shadowedAction) {
super(owner, ImmutableList.<Artifact>of(), extraActionInfoFile, false);
this.shadowedAction = Preconditions.checkNotNull(shadowedAction, extraActionInfoFile);
}
@Override
public DeterministicWriter newDeterministicWriter(EventHandler eventHandler, Executor executor)
throws IOException, InterruptedException, ExecException {
return new DeterministicWriter() {
// Instantiate the extra action info only on execution, so it is computed freshly each
// execution, but is constant for the lifetime of this action's execution. These are not
// large objects, so keeping them in memory for the duration of a single action's execution
// is acceptable.
private final ExtraActionInfo extraActionInfo = shadowedAction.getExtraActionInfo().build();
@Override
public void writeOutputFile(OutputStream out) throws IOException {
extraActionInfo.writeTo(out);
}
};
}
@Override
protected String computeKey() {
Fingerprint f = new Fingerprint();
f.addString(UUID);
f.addString(shadowedAction.getKey());
return f.hexDigestAndReset();
}
}
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