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229 lines
7.8 KiB
Java
229 lines
7.8 KiB
Java
// MCASTSource.java
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package protocol; // protocol package
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import java.util.*; // import Java utility classes
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import support.*; // import Jasper support classes
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/**
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This is the class that supports the source for broad/uni/multicast.
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@author Kenneth J. Turner
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@version 1.0 (24th July 2010, KJT): initial version
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*/
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public class MCASTSource implements ProtocolEntity {
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/** Service broadcast send offer */
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private final static String SEND_BROADCAST =
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"Broadcast message for routers B, D, E, F";
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/** Service multicast send offer */
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private final static String SEND_MULTICAST =
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"Multicast message for routers B, D, E";
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/** Service unicast send offer */
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private final static String SEND_UNICAST =
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"Unicast message for routers B, D, E";
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/** Service message count */
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private int messageCount;
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/** Service data unit output */
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private PDU sdu;
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/** Service data unit destination letters */
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private String serviceDestinations;
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/** Service provider events */
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private Vector<ProtocolEvent> serviceEvents;
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/** Service entity name */
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private String serviceName;
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/**
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Constructor for sources/sinks.
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@param serviceName service name
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*/
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public MCASTSource(String serviceName) {
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this.serviceName = serviceName; // set service name
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initialise(); // initialise service entity
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}
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/**
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Check if the service destinations have received an SDU. If so, re-initialise
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these destinations.
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@return true/false if all service destinations have/have not
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received an SDU
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*/
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public boolean checkDestinations() {
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boolean result = false; // initialise result
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int sduCount = 0; // initialise SDU count
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int length = serviceDestinations.length(); // get number of destinations
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for (int i = 0; i < length; i++) { // go through destinations
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Vector<MCASTSdu> sdus = // get SDUs for destination
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MCAST.getSDUs(serviceDestinations.charAt(i));
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if (sdus != null && sdus.size() > 0) // destination has SDUs?
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sduCount++; // increment SDU count
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}
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if (sduCount == length) { // all destinations have SDUs?
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result = true; // note true result
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for (int i = 0; i < length; i++) { // go through destinations
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ProtocolEntity entity = // get destination entity
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MCAST.getEntity(serviceDestinations.charAt(i));
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entity.initialise(); // re-initialise entity
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}
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}
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return(result); // return check result
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}
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/**
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Return the service name.
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@return service name
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*/
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public String getName() {
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return(serviceName); // return service name
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}
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/**
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Return services currently offered.
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@return list of services
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*/
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public Vector<String> getServices() {
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Vector<String> list = new Vector<String>(); // initialise service list
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if (sdu == null || checkDestinations()) { // no SDU sent or all received?
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if (MCAST.serviceMode == MCAST.BROADCAST) // broadcast?
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list.addElement(SEND_BROADCAST); // add broadcast send to list
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else if (MCAST.serviceMode == MCAST.MULTICAST) // multicast?
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list.addElement(SEND_MULTICAST); // add multicast send to list
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else if (MCAST.serviceMode == MCAST.UNICAST) // multicast?
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list.addElement(SEND_UNICAST); // add unicast send to list
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}
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return(list); // return service list
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}
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/**
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Initialise the service entity.
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*/
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public void initialise() {
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messageCount = 0; // initialise message count
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sdu = null; // initialise SDU output
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serviceEvents = new Vector<ProtocolEvent>();// initialise service events
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}
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/**
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Perform service.
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@param service service request
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@return resulting service events
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*/
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public Vector<ProtocolEvent> performService(String service) {
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serviceEvents = new Vector<ProtocolEvent>();// initialise service events
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String message = "M" + messageCount; // create message
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messageCount++; // increment message count
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if (service.equals(SEND_BROADCAST)) { // send broadcast request?
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MCAST.serviceMode = MCAST.BROADCAST; // set broadcast mode
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serviceDestinations = "BDEF"; // set service destinations
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sdu = new MCASTSdu("B", message); // create SDU to B
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serviceEvents.addElement( // add copy comment
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MCAST.comment(this, "copy"));
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transmitPDU(sdu, 'A'); // send message to router A
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sdu = new MCASTSdu("D", message); // create SDU to D
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serviceEvents.addElement( // add copy comment
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MCAST.comment(this, "copy"));
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transmitPDU(sdu, 'A'); // send message to router A
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sdu = new MCASTSdu("E", message); // create SDU to E
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serviceEvents.addElement( // add copy comment
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MCAST.comment(this, "copy"));
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transmitPDU(sdu, 'A'); // send message to router A
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sdu = new MCASTSdu("F", message); // create SDU to F
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serviceEvents.addElement( // add copy comment
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MCAST.comment(this, "copy"));
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transmitPDU(sdu, 'A'); // send message to router A
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}
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else if (service.equals(SEND_MULTICAST)) { // send multicast request?
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MCAST.serviceMode = MCAST.MULTICAST; // set multicast mode
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serviceDestinations = "BDE"; // set service destinations
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sdu = new MCASTSdu("BDE", message); // create SDU to B, D, E
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transmitPDU(sdu, 'A'); // send message to router A
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}
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else if (service.equals(SEND_UNICAST)) { // send unicast request?
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MCAST.serviceMode = MCAST.UNICAST; // set unicast mode
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serviceDestinations = "BDE"; // set service destinations
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sdu = new MCASTSdu("B", message); // create SDU to B
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serviceEvents.addElement( // add copy comment
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MCAST.comment(this, "copy"));
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transmitPDU(sdu, 'A'); // send message to router A
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sdu = new MCASTSdu("D", message); // create SDU to D
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serviceEvents.addElement( // add copy comment
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MCAST.comment(this, "copy"));
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transmitPDU(sdu, 'A'); // send message to router A
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sdu = new MCASTSdu("E", message); // create SDU to E
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serviceEvents.addElement( // add copy comment
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MCAST.comment(this, "copy"));
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transmitPDU(sdu, 'A'); // send message to router A
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}
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return(serviceEvents); // return service events
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}
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/**
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Receive an SDU.
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@param sdu SDU
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@return resulting service events
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*/
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public Vector<ProtocolEvent> receivePDU(PDU sdu) {
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serviceEvents = new Vector<ProtocolEvent>();// initialise service events
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return(serviceEvents); // return service events
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}
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/**
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Send an SDU.
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@param sdu SDU
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*/
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public void transmitPDU(PDU sdu) {
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String destinations = // get destinations
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((MCASTSdu) sdu).getDestinations();
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ProtocolEntity entityDestination = // get protocol entity dest.
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MCAST.getEntity(destinations.charAt(0));
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transmitPDU(sdu, entityDestination); // transmit PDU
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}
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/**
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Send an SDU to the given destination letter.
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@param sdu SDU
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@param destination destination letter
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*/
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public void transmitPDU(PDU sdu, char destination) {
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ProtocolEntity entityDestination = // get protocol entity dest.
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MCAST.getEntity(destination);
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transmitPDU(sdu, entityDestination); // transmit PDU
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}
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/**
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Send an SDU to the given destination entity.
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@param sdu SDU
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@param destination destination entity
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*/
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public void transmitPDU(PDU sdu, ProtocolEntity destination) {
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sdu.setSource(this); // set source as this entity
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sdu.setDestination(destination); // set destination
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Vector<ProtocolEvent> receiveEvents = // receive SDU at destination
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destination.receivePDU(sdu);
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serviceEvents.addElement( // add send event
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new ProtocolEvent(ProtocolEvent.SEND, sdu));
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for (int i = 0; i < receiveEvents.size(); i++) // go through receive events
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serviceEvents.addElement( // append receive event
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receiveEvents.get(i));
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}
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}
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