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src/org/cloudbus/cloudsim/UtilizationModelStochastic.java

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+/*
+ * Title:        CloudSim Toolkit
+ * Description:  CloudSim (Cloud Simulation) Toolkit for Modeling and Simulation of Clouds
+ * Licence:      GPL - http://www.gnu.org/copyleft/gpl.html
+ *
+ * Copyright (c) 2009-2012, The University of Melbourne, Australia
+ */
+
+package org.cloudbus.cloudsim;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Random;
+
+/**
+ * The UtilizationModelStochastic class implements a model, according to which a Cloudlet generates
+ * random CPU utilization every time frame.
+ * 
+ * @author Anton Beloglazov
+ * @since CloudSim Toolkit 2.0
+ */
+public class UtilizationModelStochastic implements UtilizationModel {
+
+	/** The random generator. */
+	private Random randomGenerator;
+
+	/** The history. */
+	private Map<Double, Double> history;
+
+	/**
+	 * Instantiates a new utilization model stochastic.
+	 */
+	public UtilizationModelStochastic() {
+		setHistory(new HashMap<Double, Double>());
+		setRandomGenerator(new Random());
+	}
+
+	/**
+	 * Instantiates a new utilization model stochastic.
+	 * 
+	 * @param seed the seed
+	 */
+	public UtilizationModelStochastic(long seed) {
+		setHistory(new HashMap<Double, Double>());
+		setRandomGenerator(new Random(seed));
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see cloudsim.power.UtilizationModel#getUtilization(double)
+	 */
+	@Override
+	public double getUtilization(double time) {
+		if (getHistory().containsKey(time)) {
+			return getHistory().get(time);
+		}
+
+		double utilization = getRandomGenerator().nextDouble();
+		getHistory().put(time, utilization);
+		return utilization;
+	}
+
+	/**
+	 * Gets the history.
+	 * 
+	 * @return the history
+	 */
+	protected Map<Double, Double> getHistory() {
+		return history;
+	}
+
+	/**
+	 * Sets the history.
+	 * 
+	 * @param history the history
+	 */
+	protected void setHistory(Map<Double, Double> history) {
+		this.history = history;
+	}
+
+	/**
+	 * Save history.
+	 * 
+	 * @param filename the filename
+	 * @throws Exception the exception
+	 */
+	public void saveHistory(String filename) throws Exception {
+		FileOutputStream fos = new FileOutputStream(filename);
+		ObjectOutputStream oos = new ObjectOutputStream(fos);
+		oos.writeObject(getHistory());
+		oos.close();
+	}
+
+	/**
+	 * Load history.
+	 * 
+	 * @param filename the filename
+	 * @throws Exception the exception
+	 */
+	@SuppressWarnings("unchecked")
+	public void loadHistory(String filename) throws Exception {
+		FileInputStream fis = new FileInputStream(filename);
+		ObjectInputStream ois = new ObjectInputStream(fis);
+		setHistory((Map<Double, Double>) ois.readObject());
+		ois.close();
+	}
+
+	/**
+	 * Sets the random generator.
+	 * 
+	 * @param randomGenerator the new random generator
+	 */
+	public void setRandomGenerator(Random randomGenerator) {
+		this.randomGenerator = randomGenerator;
+	}
+
+	/**
+	 * Gets the random generator.
+	 * 
+	 * @return the random generator
+	 */
+	public Random getRandomGenerator() {
+		return randomGenerator;
+	}
+
+}