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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.actions;
import com.google.common.base.Preconditions;
import com.google.devtools.build.lib.actions.Artifact.OwnerlessArtifactWrapper;
import javax.annotation.Nullable;
import javax.annotation.concurrent.ThreadSafe;
/**
* An action graph that resolves generating actions by looking them up in a map.
*/
@ThreadSafe
public final class MapBasedActionGraph implements MutableActionGraph {
private final ActionKeyContext actionKeyContext;
private final ConcurrentMultimapWithHeadElement<OwnerlessArtifactWrapper, ActionAnalysisMetadata>
generatingActionMap = new ConcurrentMultimapWithHeadElement<>();
public MapBasedActionGraph(ActionKeyContext actionKeyContext) {
this.actionKeyContext = actionKeyContext;
}
@Override
@Nullable
public ActionAnalysisMetadata getGeneratingAction(Artifact artifact) {
return generatingActionMap.get(new OwnerlessArtifactWrapper(artifact));
}
@Override
public void registerAction(ActionAnalysisMetadata action) throws ActionConflictException {
for (Artifact artifact : action.getOutputs()) {
OwnerlessArtifactWrapper wrapper = new OwnerlessArtifactWrapper(artifact);
ActionAnalysisMetadata previousAction = generatingActionMap.putAndGet(wrapper, action);
if (previousAction != null
&& previousAction != action
&& !Actions.canBeShared(actionKeyContext, action, previousAction)) {
generatingActionMap.remove(wrapper, action);
throw new ActionConflictException(actionKeyContext, artifact, previousAction, action);
}
}
}
@Override
public void unregisterAction(ActionAnalysisMetadata action) {
for (Artifact artifact : action.getOutputs()) {
OwnerlessArtifactWrapper wrapper = new OwnerlessArtifactWrapper(artifact);
generatingActionMap.remove(wrapper, action);
ActionAnalysisMetadata otherAction = generatingActionMap.get(wrapper);
Preconditions.checkState(
otherAction == null
|| (otherAction != action
&& Actions.canBeShared(actionKeyContext, action, otherAction)),
"%s %s",
action,
otherAction);
}
}
@Override
public void clear() {
generatingActionMap.clear();
}
}
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