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src/org/cloudbus/cloudsim/SanStorage.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.util.Iterator;
+import java.util.List;
+
+/**
+ * SANStorage represents a storage area network composed of a set of harddisks connected in a LAN.
+ * Capacity of individual disks are abstracted, thus only the overall capacity of the SAN is
+ * considered. WARNING: This class is not yet fully functional. Effects of network contention are
+ * not considered in the simulation. So, time for file transfer is underestimated in the presence of
+ * high network load.
+ * 
+ * @author Rodrigo N. Calheiros
+ * @since CloudSim Toolkit 1.0
+ */
+public class SanStorage extends HarddriveStorage {
+
+	/** The bandwidth. */
+	double bandwidth;
+
+	/** The network latency. */
+	double networkLatency;
+
+	/**
+	 * Creates a new SAN with a given capacity, latency, and bandwidth of the network connection.
+	 * 
+	 * @param capacity Storage device capacity
+	 * @param bandwidth Network bandwidth
+	 * @param networkLatency Network latency
+	 * @throws ParameterException when the name and the capacity are not valid
+	 */
+	public SanStorage(double capacity, double bandwidth, double networkLatency) throws ParameterException {
+		super(capacity);
+		this.bandwidth = bandwidth;
+		this.networkLatency = networkLatency;
+	}
+
+	/**
+	 * Creates a new SAN with a given capacity, latency, and bandwidth of the network connection.
+	 * 
+	 * @param name the name of the new harddrive storage
+	 * @param capacity Storage device capacity
+	 * @param bandwidth Network bandwidth
+	 * @param networkLatency Network latency
+	 * @throws ParameterException when the name and the capacity are not valid
+	 */
+	public SanStorage(String name, double capacity, double bandwidth, double networkLatency)
+			throws ParameterException {
+		super(name, capacity);
+		this.bandwidth = bandwidth;
+		this.networkLatency = networkLatency;
+	}
+
+	/**
+	 * Adds a file for which the space has already been reserved.
+	 * 
+	 * @param file the file to be added
+	 * @return the time (in seconds) required to add the file
+	 */
+	@Override
+	public double addReservedFile(File file) {
+		double time = super.addReservedFile(file);
+		time += networkLatency;
+		time += file.getSize() * bandwidth;
+
+		return time;
+	}
+
+	/**
+	 * Gets the maximum transfer rate of the storage in MB/sec.
+	 * 
+	 * @return the maximum transfer rate in MB/sec
+	 */
+	@Override
+	public double getMaxTransferRate() {
+
+		double diskRate = super.getMaxTransferRate();
+
+		// the max transfer rate is the minimum between
+		// the network bandwidth and the disk rate
+		if (diskRate < bandwidth) {
+			return diskRate;
+		}
+		return bandwidth;
+	}
+
+	/**
+	 * Adds a file to the storage.
+	 * 
+	 * @param file the file to be added
+	 * @return the time taken (in seconds) for adding the specified file
+	 */
+	@Override
+	public double addFile(File file) {
+		double time = super.addFile(file);
+
+		time += networkLatency;
+		time += file.getSize() * bandwidth;
+
+		return time;
+	}
+
+	/**
+	 * Adds a set of files to the storage. Runs through the list of files and save all of them. The
+	 * time taken (in seconds) for adding each file can also be found using
+	 * {@link gridsim.datagrid.File#getTransactionTime()}.
+	 * 
+	 * @param list the files to be added
+	 * @return the time taken (in seconds) for adding the specified files
+	 */
+	@Override
+	public double addFile(List<File> list) {
+		double result = 0.0;
+		if (list == null || list.size() == 0) {
+			Log.printLine(getName() + ".addFile(): Warning - list is empty.");
+			return result;
+		}
+
+		Iterator<File> it = list.iterator();
+		File file = null;
+		while (it.hasNext()) {
+			file = it.next();
+			result += this.addFile(file);    // add each file in the list
+		}
+		return result;
+	}
+
+	/**
+	 * Removes a file from the storage. The time taken (in seconds) for deleting the file can also
+	 * be found using {@link gridsim.datagrid.File#getTransactionTime()}.
+	 * 
+	 * @param fileName the name of the file to be removed
+	 * @param file the file which is removed from the storage is returned through this parameter
+	 * @return the time taken (in seconds) for deleting the specified file
+	 */
+	@Override
+	public double deleteFile(String fileName, File file) {
+		return this.deleteFile(file);
+	}
+
+	/**
+	 * Removes a file from the storage. The time taken (in seconds) for deleting the file can also
+	 * be found using {@link gridsim.datagrid.File#getTransactionTime()}.
+	 * 
+	 * @param file the file which is removed from the storage is returned through this parameter
+	 * @return the time taken (in seconds) for deleting the specified file
+	 */
+	@Override
+	public double deleteFile(File file) {
+		double time = super.deleteFile(file);
+
+		time += networkLatency;
+		time += file.getSize() * bandwidth;
+
+		return time;
+	}
+
+}