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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.runtime;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.Action;
import com.google.devtools.build.lib.util.Clock;
/**
* Computes the critical path during a build.
*/
public class SimpleCriticalPathComputer
extends CriticalPathComputer<SimpleCriticalPathComponent,
AggregatedCriticalPath<SimpleCriticalPathComponent>> {
SimpleCriticalPathComputer(Clock clock, boolean discardActions) {
super(clock, discardActions);
}
@Override
public SimpleCriticalPathComponent createComponent(Action action, long relativeStartNanos) {
return discardActions
? new ActionDiscardingCriticalPathComponent(action, relativeStartNanos)
: new SimpleCriticalPathComponent(action, relativeStartNanos);
}
/**
* Return the critical path stats for the current command execution.
*
* <p>This method allow us to calculate lazily the aggregate statistics of the critical path,
* avoiding the memory and cpu penalty for doing it for all the actions executed.
*/
@Override
public AggregatedCriticalPath<SimpleCriticalPathComponent> aggregate() {
ImmutableList.Builder<SimpleCriticalPathComponent> components = ImmutableList.builder();
SimpleCriticalPathComponent maxCriticalPath = getMaxCriticalPath();
if (maxCriticalPath == null) {
return new AggregatedCriticalPath<>(0, components.build());
}
SimpleCriticalPathComponent child = maxCriticalPath;
while (child != null) {
components.add(child);
child = child.getChild();
}
return new AggregatedCriticalPath<>(maxCriticalPath.getAggregatedElapsedTimeMillis(),
components.build());
}
}
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