| // 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>> { |
| |
| public SimpleCriticalPathComputer(Clock clock) { |
| super(clock); |
| } |
| |
| @Override |
| public SimpleCriticalPathComponent createComponent(Action action, long relativeStartNanos) { |
| return 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()); |
| } |
| } |
| |