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// Copyright 2016 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.ImmutableList;
import com.google.devtools.build.lib.actions.Action;
import com.google.devtools.build.lib.actions.Artifact.TreeFileArtifact;
import com.google.devtools.build.lib.actions.ArtifactPrefixConflictException;
import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException;
import com.google.devtools.build.lib.analysis.actions.SpawnActionTemplate;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.skyframe.ActionTemplateExpansionValue.ActionTemplateExpansionKey;
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 javax.annotation.Nullable;
/**
* The SkyFunction for {@link ActionTemplateExpansionValue}.
*
* <p>Given an action template, this function resolves its input TreeArtifact, then expands the
* action template into a list of actions using the expanded {@link TreeFileArtifact}s under the
* input TreeArtifact.
*/
public class ActionTemplateExpansionFunction implements SkyFunction {
@Override
public SkyValue compute(SkyKey skyKey, Environment env)
throws ActionTemplateExpansionFunctionException, InterruptedException {
ActionTemplateExpansionKey key = (ActionTemplateExpansionKey) skyKey.argument();
SpawnActionTemplate actionTemplate = key.getActionTemplate();
// Requests the TreeArtifactValue object for the input TreeArtifact.
SkyKey artifactValueKey = ArtifactSkyKey.key(actionTemplate.getInputTreeArtifact(), true);
TreeArtifactValue treeArtifactValue = (TreeArtifactValue) env.getValue(artifactValueKey);
// Input TreeArtifact is not ready yet.
if (env.valuesMissing()) {
return null;
}
Iterable<TreeFileArtifact> inputTreeFileArtifacts = treeArtifactValue.getChildren();
Iterable<Action> expandedActions;
try {
// Expand the action template using the list of expanded input TreeFileArtifacts.
expandedActions = ImmutableList.<Action>copyOf(
actionTemplate.generateActionForInputArtifacts(inputTreeFileArtifacts, key));
} catch (ActionConflictException e) {
e.reportTo(env.getListener());
throw new ActionTemplateExpansionFunctionException(e);
} catch (ArtifactPrefixConflictException e) {
env.getListener().handle(Event.error(e.getMessage()));
throw new ActionTemplateExpansionFunctionException(e);
}
return new ActionTemplateExpansionValue(expandedActions);
}
/** Exception thrown by {@link ActionTemplateExpansionFunction}. */
public static final class ActionTemplateExpansionFunctionException extends SkyFunctionException {
ActionTemplateExpansionFunctionException(ActionConflictException e) {
super(e, Transience.PERSISTENT);
}
ActionTemplateExpansionFunctionException(ArtifactPrefixConflictException e) {
super(e, Transience.PERSISTENT);
}
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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