Github user R-Rajkumar commented on a diff in the pull request:
https://github.com/apache/stratos/pull/382#discussion_r35234677
--- Diff:
extensions/cep/stratos-cep-extension/src/main/java/org/apache/stratos/cep/extension/CurveFinderWindowProcessor.java
---
@@ -0,0 +1,236 @@
+package org.apache.stratos.cep.extension;
+
+import org.apache.log4j.Logger;
+import org.wso2.siddhi.core.config.SiddhiContext;
+import org.wso2.siddhi.core.event.StreamEvent;
+import org.wso2.siddhi.core.event.in.InEvent;
+import org.wso2.siddhi.core.event.in.InListEvent;
+import org.wso2.siddhi.core.event.remove.RemoveEvent;
+import org.wso2.siddhi.core.event.remove.RemoveListEvent;
+import org.wso2.siddhi.core.persistence.ThreadBarrier;
+import org.wso2.siddhi.core.query.QueryPostProcessingElement;
+import org.wso2.siddhi.core.query.processor.window.RunnableWindowProcessor;
+import org.wso2.siddhi.core.query.processor.window.WindowProcessor;
+import
org.wso2.siddhi.core.util.collection.queue.scheduler.ISchedulerSiddhiQueue;
+import
org.wso2.siddhi.core.util.collection.queue.scheduler.SchedulerSiddhiQueue;
+import
org.wso2.siddhi.core.util.collection.queue.scheduler.SchedulerSiddhiQueueGrid;
+import org.wso2.siddhi.query.api.definition.AbstractDefinition;
+import org.wso2.siddhi.query.api.definition.Attribute;
+import org.wso2.siddhi.query.api.definition.Attribute.Type;
+import org.wso2.siddhi.query.api.expression.Expression;
+import org.wso2.siddhi.query.api.expression.Variable;
+import org.wso2.siddhi.query.api.expression.constant.IntConstant;
+import org.wso2.siddhi.query.api.expression.constant.LongConstant;
+import org.wso2.siddhi.query.api.extension.annotation.SiddhiExtension;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.concurrent.RejectedExecutionException;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+@SiddhiExtension(namespace = "stratos", function = "curveFitting")
+public class CurveFinderWindowProcessor extends WindowProcessor implements
RunnableWindowProcessor{
+
+ static final Logger log =
Logger.getLogger(CurveFinderWindowProcessor.class);
+ /**
+ * alpha is used as the smoothing constant in exponential moving
average
+ */
+ public static final double ALPHA = 0.8000;
--- End diff --
make this ALPHA configurable.
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