com.sun.btrace.aggregation.Average Maven / Gradle / Ivy
/*
* Copyright 2008-2010 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package com.sun.btrace.aggregation;
/**
* Aggregation function for computing the mean value.
*
*
* @author Christian Glencross
*/
class Average implements AggregationValue {
long sum = 0;
int count = 0;
@Override
public synchronized void clear() {
sum = 0;
count = 0;
}
@Override
public synchronized void add(long delta) {
sum += delta;
count++;
}
public synchronized long getValue() {
if (count == 0) {
return 0; // Avoid division by zero
}
return (int) (sum / count);
}
public Object getData() {
return Long.valueOf(getValue());
}
}