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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.devtools.build.lib.clock.BlazeClock;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.util.Date;
/**
* Base class for Command events that includes some resource fields.
*/
public abstract class CommandEvent {
private final long eventTimeInNanos;
private final long eventTimeInEpochTime;
private final long gcTimeInMillis;
protected CommandEvent() {
eventTimeInNanos = BlazeClock.nanoTime();
eventTimeInEpochTime = new Date().getTime();
gcTimeInMillis = collectGcTimeInMillis();
}
/**
* Returns time spent in garbage collection since the start of the JVM process.
*/
private static long collectGcTimeInMillis() {
long gcTime = 0;
for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) {
gcTime += gcBean.getCollectionTime();
}
return gcTime;
}
/**
* Get the time-stamp in ns for the event.
*/
public long getEventTimeInNanos() {
return eventTimeInNanos;
}
/**
* Get the time-stamp as epoch-time for the event.
*/
public long getEventTimeInEpochTime() {
return eventTimeInEpochTime;
}
/**
* Get the cumulative GC time for the event.
*/
public long getGCTimeInMillis() {
return gcTimeInMillis;
}
}
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