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src/org/fog/application/selectivity/FractionalSelectivity.java

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+package org.fog.application.selectivity;
+
+/**
+ * Generates an output tuple for an incoming input tuple with a fixed probability
+ * @author Harshit Gupta
+ *
+ */
+public class FractionalSelectivity implements SelectivityModel{
+
+	/**
+	 * The fixed probability of output tuple creation per incoming input tuple
+	 */
+	double selectivity;
+	
+	public FractionalSelectivity(double selectivity){
+		setSelectivity(selectivity);
+	}
+	public double getSelectivity() {
+		return selectivity;
+	}
+	public void setSelectivity(double selectivity) {
+		this.selectivity = selectivity;
+	}
+	
+	@Override
+	public boolean canSelect() {
+		if(Math.random() < getSelectivity()) // if the probability condition is satisfied
+			return true;
+		return false;
+	}
+	
+	@Override
+	public double getMeanRate() {
+		return getSelectivity(); // the average rate of tuple generation is the fixed probability value
+	}
+	
+	@Override
+	public double getMaxRate() {
+		return getSelectivity(); // the maximum rate of tuple generation is the fixed probability value
+	}
+	
+}