org.apache.uima.ducc.container.common.SynchronizedStats Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.uima.ducc.container.common;
public class SynchronizedStats {
long num;
double sum;
double sumsqrs;
double min;
double max;
Object mux;
public SynchronizedStats() {
num = 0;
sum = 0;
sumsqrs = 0;
min = Double.MAX_VALUE;
max = Double.MIN_VALUE;
mux = new Object();
}
public void addValue(double d) {
synchronized(mux) {
num++;
sum += d;
sumsqrs += d*d;
if (d < min) {
min = d;
}
if (d > max) {
max = d;
}
}
}
public long getNum() {
synchronized(mux) {
return num;
}
}
public double getSum() {
synchronized(mux) {
return sum;
}
}
public double getMax() {
synchronized(mux) {
return max;
}
}
public double getMin() {
synchronized(mux) {
return min;
}
}
public double getMean() {
synchronized(mux) {
if (num == 0 ) {
return Double.NaN;
} else {
return sum/num;
}
}
}
public double getStandardDeviation1() {
synchronized(mux) {
if ( num == 0 ) {
return Double.NaN;
} else {
return Math.sqrt((num*sumsqrs - sum*sum)/num);
}
}
}
//s = square root of[(sum of Xsquared -((sum of X)*(sum of X)/N))/(N-1)]
public double getStandardDeviation() {
synchronized(mux) {
if ( num == 0 ) {
return Double.NaN;
} else {
return Math.sqrt(((sumsqrs-(sum*sum)/num)/(num-1)));
}
}
}
/**
* @param args
*/
public static void main(String[] args) {
SynchronizedStats s = new SynchronizedStats();
s.addValue(1);
s.addValue(2);
s.addValue(3);
System.out.println("max:"+s.getMax());
System.out.println("min:"+s.getMin());
System.out.println("avg:"+s.getMean());
System.out.println("dev:"+s.getStandardDeviation());
}
}