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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.skyframe;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.util.Preconditions;
import com.google.devtools.common.options.OptionsClassProvider;
import javax.annotation.Nullable;
/**
* A driver for auto-updating graphs which operate over monotonically increasing integer versions.
*/
public class SequentialBuildDriver implements BuildDriver {
private final MemoizingEvaluator memoizingEvaluator;
private IntVersion curVersion;
public SequentialBuildDriver(MemoizingEvaluator evaluator) {
this.memoizingEvaluator = Preconditions.checkNotNull(evaluator);
this.curVersion = IntVersion.of(0);
}
@Override
public <T extends SkyValue> EvaluationResult<T> evaluate(
Iterable<SkyKey> roots, boolean keepGoing, int numThreads, EventHandler reporter)
throws InterruptedException {
try {
return memoizingEvaluator.evaluate(roots, curVersion, keepGoing, numThreads, reporter);
} finally {
curVersion = curVersion.next();
}
}
@Override
public String meta(Iterable<SkyKey> of, OptionsClassProvider options) {
return "";
}
@Override
public MemoizingEvaluator getGraphForTesting() {
return memoizingEvaluator;
}
@Nullable
@Override
public SkyValue getExistingValueForTesting(SkyKey key) {
return memoizingEvaluator.getExistingValueForTesting(key);
}
@Nullable
@Override
public ErrorInfo getExistingErrorForTesting(SkyKey key) {
return memoizingEvaluator.getExistingErrorForTesting(key);
}
}
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