1 | /************************************************************************************ |
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2 | * Copyright (C) 2008 by Politehnica University of Bucharest and Rutgers University |
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3 | * All rights reserved. |
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4 | * Refer to LICENSE for terms and conditions of use. |
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5 | ***********************************************************************************/ |
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6 | package vnsim.applications.vitp.utils; |
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7 | |
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8 | import java.util.*; |
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9 | |
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10 | public class MessageIndexModule { |
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11 | //an instance of this class manages the unique identifiers of the VITP |
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12 | //messages issued by the local node. It is used by the routing layer to |
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13 | //match incoming replies to pending requests |
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14 | |
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15 | public static int index=0; |
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16 | |
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17 | Vector<Integer> pending=new Vector<Integer>(); //the pending replies |
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18 | |
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19 | Vector<Integer> broadcasted=new Vector<Integer>(); //the |
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20 | //messages already broadcasted |
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21 | |
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22 | public synchronized static int getNewMessageIdentifier(){ |
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23 | index++; |
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24 | return index; |
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25 | } |
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26 | |
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27 | public void addToPending(int id) { |
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28 | pending.addElement(new Integer(id)); |
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29 | } |
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30 | |
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31 | public void addToBroacasted(int id) { |
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32 | broadcasted.addElement(new Integer(id)); |
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33 | } |
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34 | |
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35 | public boolean isPending(int id){ |
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36 | for(int i=0;i<pending.size();i++){ |
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37 | if(((Integer)pending.elementAt(i)).intValue()==id) |
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38 | return true; |
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39 | } |
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40 | return false; |
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41 | } |
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42 | |
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43 | public boolean wasBroadcasted(int id){ |
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44 | for(int i=0;i<broadcasted.size();i++){ |
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45 | if(((Integer)broadcasted.elementAt(i)).intValue()==id) |
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46 | return true; |
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47 | } |
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48 | return false; |
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49 | } |
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50 | |
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51 | public void removeFromPending(int id){ |
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52 | pending.removeElement(new Integer(id)); |
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53 | } |
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54 | |
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55 | public void clearPending(){ |
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56 | pending.removeAll(pending); |
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57 | } |
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58 | |
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59 | |
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60 | |
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61 | private HashMap<Integer, Integer> sentMessages=new HashMap<Integer,Integer> (); |
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62 | // <messageId, vehicleId> |
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63 | // keeps track of which messages have been unicasted to which vehicle; |
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64 | // this is necessary for the reply-computation phase; when a node receives |
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65 | // the same message again, it should not send it to the same node (because |
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66 | // this suggests a loop) |
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67 | |
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68 | public void addToSent(int msgId, int vehicleId) { |
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69 | sentMessages.put(msgId, vehicleId); |
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70 | } |
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71 | |
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72 | public Integer sentTo(int msgId) { |
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73 | return sentMessages.get(msgId); |
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74 | } |
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75 | |
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76 | } |
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