cacheOverflow.WorkerStats Maven / Gradle / Ivy
/*
* Copyright (c) 2010-2015 Pivotal Software, 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. See accompanying
* LICENSE file.
*/
package cacheOverflow;
import com.gemstone.gemfire.*;
/**
* {@linkplain Statistics Statistics} about the work performed by a
* {@link Worker}.
*
* @author GemStone Systems, Inc.
*
* @since 3.2
*/
public class WorkerStats {
/** The statistic type of the WorkerStats */
private static StatisticsType type;
/** The offset of the "bytesAdded" statistic */
private static int bytesAddedOffset;
/////////////////////// Instance Fields //////////////////////
/** The actual object that keeps track of stats */
private final Statistics stats;
/////////////////////// Static Methods ///////////////////////
/**
* Initializes the statistics type using the given
* StatisticsTypeFactory. Note that this method is
* synchronized because we only want the statistics type created
* once.
*/
private static synchronized void
initializeStatsType(StatisticsTypeFactory factory) {
if (type != null) {
return;
}
String typeDesc = "Statistics about a Worker thread";
String bytesAddedDesc =
"The number of bytes added to the overflow region";
type = factory.createType(WorkerStats.class.getName(), typeDesc,
new StatisticDescriptor[] {
factory.createLongCounter("bytesAdded", bytesAddedDesc,
"bytes", true /* largerBetter */)
});
bytesAddedOffset = type.nameToDescriptor("bytesAdded").getId();
}
//////////////////////// Constructors ////////////////////////
/**
* Creates a new WorkerStats for the worker with the
* given id and registers it with the given
* StatisticsFactory.
*/
WorkerStats(int workerId, StatisticsFactory factory) {
initializeStatsType(factory);
this.stats = factory.createStatistics(type, "Worker " + workerId);
}
////////////////////// Instance Methods //////////////////////
/**
* Increments the total number of bytes added to the region by a
* given amount.
*/
void incBytesAdded(long bytesAdded) {
this.stats.incLong(bytesAddedOffset, bytesAdded);
}
}