+++ /dev/null
-/*
- * 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;
-
-
-/**
- * This static singleton emulates an underlying router network
- * of fixed size, and stores the latency measurements for all pairs
- * of routers.
- *
- * @author Alberto Montresor
- * @version $Revision: 1.6 $
- */
-public class E2ENetwork
-{
-
-//---------------------------------------------------------------------
-//Fields
-//---------------------------------------------------------------------
-
-/**
- * True if latency between nodes is considered symmetric. False otherwise.
- */
-private static boolean symm;
-
-/**
- * Size of the router network.
- */
-private static int size;
-
-/**
- * Latency distances between nodes.
- */
-private static int[][] array;
-
-//---------------------------------------------------------------------
-//Initialization
-//---------------------------------------------------------------------
-
-/** Disable instance construction */
-private E2ENetwork() {}
-
-//---------------------------------------------------------------------
-//Methods
-//---------------------------------------------------------------------
-
-/**
- * Resets the network, by creating a triangular (if symm is true) or
- * a rectangular (if symm is false) array of integers. Initially all
- * latencies between any pairs are set to be 0.
- * @param size the number or routers
- * @param symm if latency is symmetric between all pairs of routers
- */
-public static void reset(int size, boolean symm)
-{
- E2ENetwork.symm = symm;
- E2ENetwork.size = size;
- array = new int[size][];
- for (int i=0; i < size; i++) {
- if (symm)
- array[i] = new int[i];
- else
- array[i] = new int[size];
- }
-}
-
-//---------------------------------------------------------------------
-
-/**
- * Returns the latency associated to the specified (sender, receiver)
- * pair. Routers are indexed from 0.
- *
- * @param sender the index of the sender
- * @param receiver the index of the receiver
- * @return the latency associated to the specified (sender, receiver)
- * pair.
- */
-public static int getLatency(int sender, int receiver)
-{
- if (sender == receiver)
- return 0;
- // XXX There should be the possibility to fix the delay.
- if (symm) {
- // Symmetric network
- if (sender < receiver) {
- int tmp = sender;
- sender = receiver;
- receiver = tmp;
- }
- }
- return array[sender][receiver];
-}
-
-//---------------------------------------------------------------------
-
-/**
- * Sets the latency associated to the specified (sender, receiver)
- * pair. Routers are indexed from 0.
- *
- * @param sender the index of the sender
- * @param receiver the index of the receiver
- * @param latency the latency to be set
- */
-public static void setLatency(int sender, int receiver, int latency)
-{
- if (symm) {
- // Symmetric network
- if (sender < receiver) {
- int tmp = sender;
- sender = receiver;
- receiver = tmp;
- }
- }
- array[sender][receiver] = latency;
-}
-
-//---------------------------------------------------------------------
-
-/**
- * Returns the current size of the underlying network (i.e., the number of
- * routers).
- */
-public static int getSize()
-{
- return size;
-}
-
-}
