X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/ff6cb26262ba25fefdf1265628265a75d790ebd6..200986a368bbbbb5df459d43cbc7f5ef3d7678db:/contrib/psg/src/peersim/transport/TriangularMatrixParser.java

diff --git a/contrib/psg/src/peersim/transport/TriangularMatrixParser.java b/contrib/psg/src/peersim/transport/TriangularMatrixParser.java
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+/*
+ * Copyright (c) 2003-2005 The BISON Project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+package peersim.transport;
+
+import java.io.*;
+
+import peersim.config.*;
+import peersim.core.*;
+
+/**
+ * Initializes static singleton {@link E2ENetwork} by reading a trace 
+ * file containing the latency distance measured between a set of 
+ * "virtual" routers. Latency is assumed to be symmetric, so the 
+ * latency between x and y is equal to the latency to y and x.
+ * 
+ * The format of the file is as follows: all values are stored as
+ * integers. The first value is the number of nodes considered.
+ * The rest of the values correspond to a "strictly upper triangular 
+ * matrix" (see this 
+ * <a href="http://en.wikipedia.org/w/index.php?title=Triangular_matrix&oldid=82411128">
+ * link</a>), ordered first by row than by column.
+ * 
+ * @author Alberto Montresor
+ * @version $Revision: 1.4 $
+ */
+public class TriangularMatrixParser implements Control
+{
+
+// ---------------------------------------------------------------------
+// Parameters
+// ---------------------------------------------------------------------
+
+/**
+ * This configuration parameter identifies the filename of the file
+ * containing the measurements. First, the file is used as a pathname 
+ * in the local file system. If no file can be identified in this way, 
+ * the file is searched in the local classpath. If the file cannot be 
+ * identified again, an error message is reported.
+ * @config
+ */
+private static final String PAR_FILE = "file";
+
+/**
+ * The ratio between the time units used in the configuration file and the
+ * time units used in the Peersim simulator.
+ * @config
+ */
+private static final String PAR_RATIO = "ratio";
+
+// ---------------------------------------------------------------------
+// Fields
+// ---------------------------------------------------------------------
+
+/** Name of the file containing the measurements. */
+private String filename;
+
+/** Ratio read from PAR_RATIO */
+private double ratio;
+
+// ---------------------------------------------------------------------
+// Initialization
+// ---------------------------------------------------------------------
+
+/**
+ * Read the configuration parameters.
+ */
+public TriangularMatrixParser(String prefix)
+{
+	filename = Configuration.getString(prefix + "." + PAR_FILE);
+	ratio = Configuration.getDouble(prefix + "." + PAR_RATIO);
+}
+
+// ---------------------------------------------------------------------
+// Methods
+// ---------------------------------------------------------------------
+
+/**
+ * Initializes static singleton {@link E2ENetwork} by reading a king data set.
+* @return  always false
+*/
+public boolean execute()
+{
+	try {
+		ObjectInputStream in = null;
+		try {
+			in = new ObjectInputStream(
+					new BufferedInputStream(
+							new FileInputStream(filename)));
+			System.err.println("TriangularMatrixParser: Reading " + filename + " from local file system");
+		} catch (FileNotFoundException e) {
+			in = new ObjectInputStream(
+					new BufferedInputStream(
+							ClassLoader.getSystemResourceAsStream(filename)));
+			System.err.println("TriangularMatrixParser: Reading " + filename + " through the class loader");
+		}
+	
+		// Read the number of nodes in the file (first four bytes).
+	  int size = in.readInt();
+	  
+		// Reset the E2E network
+		E2ENetwork.reset(size, true);
+		System.err.println("TriangularMatrixParser: reading " + size + " rows");
+	
+		// If the file format is not correct, data will be read 
+		// incorrectly. Probably a good way to spot this is the 
+		// presence of negative delays, or an end of file.
+	
+		// Reading data
+		int count = 0;
+		for (int r=0; r < size; r++) {
+			for (int c = r+1; c < size; c++) {
+				int x = (int) (ratio*in.readInt());
+				count++;
+				E2ENetwork.setLatency(r,c,x);
+			}
+		}
+		System.err.println("TriangularMatrixParser: Read " + count + " entries");
+	} catch (IOException e) {
+		throw new RuntimeException(e.getMessage());
+	}
+	return false;
+}
+
+}