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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.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec.VisibleForSerialization;
import com.google.devtools.build.lib.util.Fingerprint;
/**
* An action that depends on a set of inputs and creates a single output file whenever it runs. This
* is useful for bundling up a bunch of dependencies that are shared between individual targets in
* the action graph; for example generated header files.
*/
@Immutable
@AutoCodec
public final class MiddlemanAction extends AbstractAction {
public static final String MIDDLEMAN_MNEMONIC = "Middleman";
private final String description;
private final MiddlemanType middlemanType;
@VisibleForSerialization
@AutoCodec.Instantiator
MiddlemanAction(
ActionOwner owner,
NestedSet<Artifact> inputs,
ImmutableSet<Artifact> outputs,
String description,
MiddlemanType middlemanType) {
super(owner, inputs, outputs);
Preconditions.checkNotNull(middlemanType);
Preconditions.checkArgument(Iterables.getOnlyElement(outputs).isMiddlemanArtifact(), outputs);
Preconditions.checkNotNull(description);
this.description = description;
this.middlemanType = middlemanType;
}
@Override
public final ActionResult execute(ActionExecutionContext actionExecutionContext) {
throw new IllegalStateException("MiddlemanAction should never be executed");
}
@Override
protected void computeKey(ActionKeyContext actionKeyContext, Fingerprint fp) {
// TODO(bazel-team): Need to take middlemanType into account here.
// Only the set of inputs matters, and the dependency checker is
// responsible for considering those.
}
/**
* Returns the type of the middleman.
*/
@Override
public MiddlemanType getActionType() {
return middlemanType;
}
@Override
protected String getRawProgressMessage() {
return null; // users don't really want to know about Middlemen.
}
@Override
public String prettyPrint() {
return description + " for " + Label.print(getOwner().getLabel());
}
@Override
public String getMnemonic() {
return MIDDLEMAN_MNEMONIC;
}
@Override
public boolean mayInsensitivelyPropagateInputs() {
return true;
}
/** Creates a new middleman action. */
public static Action create(
ActionRegistry env,
ActionOwner owner,
NestedSet<Artifact> inputs,
Artifact stampFile,
String purpose,
MiddlemanType middlemanType) {
MiddlemanAction action =
new MiddlemanAction(owner, inputs, ImmutableSet.of(stampFile), purpose, middlemanType);
env.registerAction(action);
return action;
}
}