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// Copyright 2014 Google Inc. 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.base.Preconditions;
import com.google.devtools.build.lib.actions.Action;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadCompatible;
import javax.annotation.Nullable;
/**
* This class records the critical path for the graph of actions executed.
*/
@ThreadCompatible
public class AbstractCriticalPathComponent<C extends AbstractCriticalPathComponent<C>> {
/** Wall time start time for the action. In milliseconds. */
private final long startTime;
/** Wall time finish time for the action. In milliseconds. */
private long finishTime = 0;
protected volatile boolean isRunning = true;
/** We keep here the critical path time for the most expensive child. */
private long childAggregatedWallTime = 0;
/** The action for which we are storing the stat. */
private final Action action;
/**
* Child with the maximum critical path.
*/
@Nullable
private C child;
public AbstractCriticalPathComponent(Action action, long startTime) {
this.action = action;
this.startTime = startTime;
}
/** Sets the finish time for the action in milliseconds. */
public void setFinishTimeMillis(long finishTime) {
Preconditions.checkState(isRunning, "Already stopped! %s.", action);
this.finishTime = finishTime;
isRunning = false;
}
/** The action for which we are storing the stat. */
public Action getAction() {
return action;
}
/**
* Add statistics for one dependency of this action.
*/
public void addDepInfo(C dep) {
Preconditions.checkState(!dep.isRunning,
"Cannot add critical path stats when the action is not finished. %s. %s", action,
dep.getAction());
long childAggregatedWallTime = dep.getAggregatedWallTime();
// Replace the child if its critical path had the maximum wall time.
if (child == null || childAggregatedWallTime > this.childAggregatedWallTime) {
this.childAggregatedWallTime = childAggregatedWallTime;
child = dep;
}
}
public long getActionWallTime() {
Preconditions.checkState(!isRunning, "Still running %s", action);
return finishTime - startTime;
}
/**
* Returns the current critical path for the action in milliseconds.
*
* <p>Critical path is defined as : action_execution_time + max(child_critical_path).
*/
public long getAggregatedWallTime() {
Preconditions.checkState(!isRunning, "Still running %s", action);
return getActionWallTime() + childAggregatedWallTime;
}
/** Time when the action started to execute. Milliseconds since epoch time. */
public long getStartTime() {
return startTime;
}
/**
* Get the child critical path component.
*
* <p>The component dependency with the maximum total critical path time.
*/
@Nullable
public C getChild() {
return child;
}
/**
* Returns a human readable representation of the critical path stats with all the details.
*/
@Override
public String toString() {
String currentTime = "still running ";
if (!isRunning) {
currentTime = String.format("%.2f", getActionWallTime() / 1000.0) + "s ";
}
return currentTime + action.describe();
}
}
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