Github user R-Rajkumar commented on a diff in the pull request:
https://github.com/apache/stratos/pull/382#discussion_r35234774
--- Diff:
extensions/cep/stratos-cep-extension/src/main/java/org/apache/stratos/cep/extension/ExponentialMovingAverage.java
---
@@ -0,0 +1,32 @@
+package org.apache.stratos.cep.extension;
+
+/**
+ * class to demonstrate how EMA works
+ */
+public class ExponentialMovingAverage {
+ public Double value;
+
+ /**
+ * smooth the value with respect to the previous value
+ * @param value
+ * @return
+ */
+ public double getAverage(double value){
+ if(this.value == null){
+ this.value = value;
+ return value;
+ }
+
+ /**
+ * calculating smoothed value
+ */
+ double newValue = CurveFinderWindowProcessor.ALPHA * value + (1.0
- CurveFinderWindowProcessor.ALPHA)*value;
+ this.value = newValue;
+
+ return newValue;
+ }
+
+ public Double getValue() {
+ return value;
+ }
+}
--- End diff --
add the licence header to this class
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