svn commit: r405491 - /jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java

[se...@apache.org]

Author: sebb
Date: Tue May  9 11:04:47 2006
New Revision: 405491

URL: http://svn.apache.org/viewcvs?rev=405491&view=rev
Log:
Add cheaper calculator (no need to save results)

Added:
    jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java

Added: jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java
URL: http://svn.apache.org/viewcvs/jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java?rev=405491&view=auto
==============================================================================
--- jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java (added)
+++ jakarta/jmeter/branches/rel-2-1/src/jorphan/org/apache/jorphan/math/Calculator.java Tue May  9 11:04:47 2006
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2006 The Apache Software Foundation.
+ *
+ * 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 org.apache.jorphan.math;
+
+/**
+ * Class to calculate various items that don't require all previous results to be saved:
+ * - mean = average
+ * - standard deviation
+ * - minimum
+ * - maximum
+ */
+public class Calculator {
+
+	private double sum = 0;
+
+	private double sumOfSquares = 0;
+
+	private double mean = 0;
+
+	private double deviation = 0;
+
+	private int count = 0;
+
+	private long bytes = 0;
+	
+	private long maximum = Long.MIN_VALUE;
+	
+	private long minimum = Long.MAX_VALUE;
+	
+	public void clear() {
+		maximum = Long.MIN_VALUE;
+		minimum = Long.MAX_VALUE;
+		sum = 0;
+		sumOfSquares = 0;
+		mean = 0;
+		deviation = 0;
+		count = 0;
+	}
+
+	public void addValue(long newValue) {
+		count++;
+		minimum=Math.min(newValue, minimum);
+		maximum=Math.max(newValue, maximum);
+		double currentVal = newValue;
+		sum += currentVal;
+		sumOfSquares += currentVal * currentVal;
+		// Calculate each time, as likely to be called for each add
+		mean = sum / count;
+		deviation = Math.sqrt((sumOfSquares / count) - (mean * mean));
+	}
+
+
+	public void addBytes(long newValue) {
+		bytes += newValue;
+	}
+
+	public long getTotalBytes() {
+		return bytes;
+	}
+
+
+	public double getMean() {
+		return mean;
+	}
+
+	public double getStandardDeviation() {
+		return deviation;
+	}
+
+	public long getMin() {
+		return minimum;
+	}
+
+	public long getMax() {
+		return maximum;
+	}
+
+	public int getCount() {
+		return count;
+	}
+}
\ No newline at end of file



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