245 lines
7.2 KiB
Java
245 lines
7.2 KiB
Java
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: RadioConnection.java,v 1.12 2009/11/25 15:21:15 fros4943 Exp $
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*/
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package se.sics.cooja;
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import java.util.ArrayList;
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import org.apache.log4j.Logger;
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import se.sics.cooja.interfaces.Radio;
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/**
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* A radio connection represents a connection between a single source radio and
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* any number of destination and interfered radios.
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*
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* Note that a destination node may be interfered, and that an interfered radio
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* does not need to be a destination. Interfered radios may be added during the
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* connection lifetime.
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*
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* Radio medium implementations may differ slightly in how they forward connection data
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* to destination and interfered radios.
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* Typically, however, all destination radios (including those that are interfered)
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* receive the connection data.
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* And the interfered non-destination radios do not receive the connection data.
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*
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* @see RadioMedium
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* @author Fredrik Osterlind
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*/
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public class RadioConnection {
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private static Logger logger = Logger.getLogger(RadioConnection.class);
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private static int ID = 0; /* Unique radio connection ID. For internal use */
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private int id;
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private Radio source;
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private ArrayList<Radio> allDestinations = new ArrayList<Radio>();
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private ArrayList<Long> allDestinationDelays = new ArrayList<Long>();
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private ArrayList<Radio> allInterfered = new ArrayList<Radio>();
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private ArrayList<Radio> onlyInterfered = new ArrayList<Radio>();
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private ArrayList<Radio> destinationsNonInterfered = new ArrayList<Radio>();
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private long startTime;
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/**
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* Creates a new radio connection with given source and no destinations.
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*
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* @param sourceRadio Source radio
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*/
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public RadioConnection(Radio sourceRadio) {
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this.source = sourceRadio;
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startTime = sourceRadio.getMote().getSimulation().getSimulationTime();
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this.id = ID++;
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}
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/**
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* @return Radio connection start time
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*/
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public long getStartTime() {
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return startTime;
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}
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/**
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* @return Start time of ongoing reception
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*/
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public long getReceptionStartTime() {
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/* TODO XXX: This may currently return the start time of an ongoing
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* interference. */
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return getStartTime();
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}
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/**
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* Add (non-interfered) destination radio to connection.
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*
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* @param radio Radio
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*/
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public void addDestination(Radio radio) {
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addDestination(radio, new Long(0));
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}
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/**
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* Experimental: remove destination.
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*
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* @param radio Radio
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*/
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public void removeDestination(Radio radio) {
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int idx = allDestinations.indexOf(radio);
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if (idx < 0) {
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logger.fatal("Radio is not a connection destination: " + radio);
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return;
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}
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allDestinations.remove(idx);
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allDestinationDelays.remove(idx);
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destinationsNonInterfered.remove(radio);
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onlyInterfered.remove(radio);
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}
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/**
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* Add (non-interfered) destination radio to connection.
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*
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* @param radio Radio
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* @param delay Radio propagation delay (us)
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*/
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public void addDestination(Radio radio, Long delay) {
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if (isDestination(radio)) {
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logger.fatal("Radio is already a destination: " + radio);
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return;
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}
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allDestinations.add(radio);
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allDestinationDelays.add(delay);
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destinationsNonInterfered.add(radio);
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onlyInterfered.remove(radio);
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}
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/**
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* @param radio Radio
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* @return Radio propagation delay (us)
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*/
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public long getDestinationDelay(Radio radio) {
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int idx = allDestinations.indexOf(radio);
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if (idx < 0) {
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logger.fatal("Radio is not a connection destination: " + radio);
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return 0;
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}
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return allDestinationDelays.get(idx);
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}
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/**
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* Adds interfered radio to connection.
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* Note that the radio may or may not already be a destination.
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*
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* @param radio Radio
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* @see #getDestinations()
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* @see #getAllDestinations()
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*/
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public void addInterfered(Radio radio) {
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if (isInterfered(radio)) {
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logger.fatal("Radio is already interfered: " + radio);
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return;
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}
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allInterfered.add(radio);
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destinationsNonInterfered.remove(radio);
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if (!isDestination(radio)) {
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onlyInterfered.add(radio);
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}
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}
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/**
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* @param radio Radio
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* @return True if radio is a non-interfered destination in this connection
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*/
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public boolean isDestination(Radio radio) {
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return destinationsNonInterfered.contains(radio);
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}
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/**
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* @param radio Radio
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* @return True if radio is interfered in this connection
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*/
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public boolean isInterfered(Radio radio) {
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return allInterfered.contains(radio);
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}
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/**
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* @return Source radio
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*/
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public Radio getSource() {
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return source;
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}
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/**
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* @see #getAllDestinations()
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* @return All non-interfered destinations
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*/
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public Radio[] getDestinations() {
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return destinationsNonInterfered.toArray(new Radio[0]);
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}
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/**
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* @see #getDestinations()
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* @return All destination radios, including radios that became
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* interfered after the connection started.
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*/
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public Radio[] getAllDestinations() {
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return allDestinations.toArray(new Radio[0]);
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}
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/**
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* @return All radios interfered by this connection, including destinations
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*/
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public Radio[] getInterfered() {
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return allInterfered.toArray(new Radio[0]);
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}
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public Radio[] getInterferedNonDestinations() {
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return onlyInterfered.toArray(new Radio[0]);
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}
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public String toString() {
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if (destinationsNonInterfered.size() == 0) {
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return id + ": Radio connection: " + source.getMote() + " -> none";
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}
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if (destinationsNonInterfered.size() == 1) {
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return id + ": Radio connection: " + source.getMote() + " -> " + destinationsNonInterfered.get(0).getMote();
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}
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return id + ": Radio connection: " + source.getMote() + " -> " + destinationsNonInterfered.size() + " motes";
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}
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}
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