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88 lines
2.4 KiB
Java
88 lines
2.4 KiB
Java
// UDPService.java (C) I. A. Robin, K. J. Turner 04/03/06
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package protocol;
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import java.util.*;
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import support.*;
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public class UDPService implements ProtocolEntity {
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private static final String SEND = "Send DatReq";
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private static final String SOURCE_PORT = "Source port";
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private static final String DEST_PORT = "Destination port";
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private ProtocolEntity provider; // protocol for service
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private Vector providerEvents;
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private PDU pduSent;
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private String name;
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private int block; // SDU ID number
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private int sourcePort = 0;
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private int destPort = 0;
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public UDPService(String name) {
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this.name = name;
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initialise();
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}
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public void initialise() {
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block = 0;
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providerEvents = new Vector();
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}
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public String getName() {
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return(name);
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}
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public void setProvider(ProtocolEntity provider) {
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this.provider = provider;
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}
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public void setSourcePort(int sp) {
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sourcePort = sp;
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}
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public void setDestPort(int dp) {
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destPort = dp;
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}
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public Vector<ProtocolEvent> receivePDU(PDU pdu) {
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return(new Vector<ProtocolEvent>());
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}
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public void transmitPDU(PDU pdu, ProtocolEntity dest) {
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pdu.setSource(this);
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pdu.setDestination(dest);
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providerEvents = dest.receivePDU(pdu);
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pduSent = pdu;
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}
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public Vector<String> getServices() {
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Vector<String> list = new Vector<String>();
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String s = SEND + "(D" + block + "): "
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+ SOURCE_PORT + " " + sourcePort + ", "
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+ DEST_PORT + " " + destPort;
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list.addElement(s);
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return(list);
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}
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public Vector<ProtocolEvent> performService(String s) {
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Vector<ProtocolEvent> events = new Vector<ProtocolEvent>();
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if (s.startsWith(SEND)) {
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String sdu = "D" + block;
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int spStart = s.indexOf(SOURCE_PORT) + SOURCE_PORT.length() + 1;
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int spEnd = s.indexOf(", ");
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int dpStart = s.indexOf(DEST_PORT) + DEST_PORT.length() + 1;
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int sp = Integer.parseInt(s.substring(spStart, spEnd));
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int dp = Integer.parseInt(s.substring(dpStart));
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PDU pdu = new UDPMessage("DatReq", sp, dp, sdu);
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transmitPDU(pdu, provider);
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block++;
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events.addElement(new ProtocolEvent(ProtocolEvent.SEND, pdu));
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}
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for (Enumeration e = providerEvents.elements(); e.hasMoreElements(); )
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events.addElement((ProtocolEvent) e.nextElement());
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return(events);
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}
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}
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