[31] | 1 | |
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| 2 | /** |
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| 3 | * Mazilu Sinziana |
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| 4 | * |
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| 5 | * EZCab Car Entity |
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| 6 | */ |
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| 7 | |
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| 8 | package vnsim.applications.ezcab; |
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| 9 | |
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| 10 | import java.io.IOException; |
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| 11 | import java.io.Serializable; |
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| 12 | import java.nio.ByteBuffer; |
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| 13 | import java.util.ArrayList; |
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| 14 | |
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| 15 | import vnsim.network.dsrc.*; |
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| 16 | import vnsim.core.*; |
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| 17 | import vnsim.core.events.SendEvent; |
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| 18 | import vnsim.map.object.Globals; |
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| 19 | |
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| 20 | public class EzcabCar extends CarRunningDSRC{ |
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| 21 | |
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| 22 | private int entityType = EzcabGlobals.CAB; /* type of entity: client or cab */ |
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| 23 | private int state; /* state of cab */ |
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| 24 | private int newState = EzcabGlobals.FREE_STATE; /* future state of cab */ |
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| 25 | private EzcabMessage newMessage; /* next message to be prepared */ |
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| 26 | private ArrayList<EzcabRequest> waitingMessages = new ArrayList<EzcabRequest>(); |
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| 27 | |
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| 28 | private long changeInWaitingState = 0; |
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| 29 | private int clientID; |
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| 30 | private int timeOfsending = 0; |
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| 31 | |
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| 32 | public EzcabCar(int state, int vehicleId, byte lane, double speed, short roadIdx, |
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| 33 | short pointIdx, byte direction,double offset) { |
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| 34 | super(vehicleId, lane, speed, roadIdx, pointIdx, direction, offset); |
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| 35 | |
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| 36 | this.entityType = EzcabGlobals.CAB; |
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| 37 | this.state = state; |
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| 38 | } |
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| 39 | |
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| 40 | /* this should be used */ |
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| 41 | public EzcabCar(int vehicleId, byte lane, double speed, short roadIdx, |
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| 42 | short pointIdx, byte direction,double offset) { |
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| 43 | super(vehicleId, lane, speed, roadIdx, pointIdx, direction, offset); |
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| 44 | |
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| 45 | this.entityType = EzcabGlobals.CAB; |
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| 46 | this.state = EzcabGlobals.FREE_STATE; |
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| 47 | } |
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| 48 | |
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| 49 | public void onReceive(byte[] bytesReceived, Serializable message, Communicator sender){ |
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| 50 | |
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| 51 | if (!isEquipped) |
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| 52 | return; |
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| 53 | |
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| 54 | if(bytesReceived == null){ |
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| 55 | processMessage(message); |
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| 56 | return; |
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| 57 | } |
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| 58 | byte header = bytesReceived[0]; |
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| 59 | |
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| 60 | switch(header) |
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| 61 | { |
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| 62 | case Globals.PROT_EZCAB: |
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| 63 | processMessage(message); |
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| 64 | break; |
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| 65 | |
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| 66 | default: |
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| 67 | super.onReceive(bytesReceived, message, sender); |
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| 68 | } |
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| 69 | } |
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| 70 | |
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| 71 | public void processMessage(Serializable message) { |
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| 72 | int idClient; |
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| 73 | int noHops; |
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| 74 | int ts; |
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| 75 | |
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| 76 | if(message == null){ |
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| 77 | return; |
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| 78 | } |
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| 79 | |
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| 80 | if(message instanceof EzcabRequest){ |
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| 81 | EzcabRequest req = (EzcabRequest)message; |
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| 82 | noHops = req.getNoHops(); |
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| 83 | idClient = req.getIdClient(); |
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| 84 | ts = req.getTimeOfSending(); |
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| 85 | |
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| 86 | /* verify if cab doesn't wait too long */ |
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| 87 | //if( ((int)(currentTime - this.changeInWaitingState)/Globals.SECOND) > EzcabGlobals.TIMEOUT){ |
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| 88 | if( ((long)(Globals.engine.getCrtTime() - this.timeOfsending)/Globals.SECOND * 1000) > EzcabGlobals.TIMEOUT ){ |
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| 89 | this.changeInWaitingState = 0; |
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| 90 | this.timeOfsending = 0; |
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| 91 | this.clientID = -1; |
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| 92 | this.state = EzcabGlobals.FREE_STATE; |
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| 93 | |
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| 94 | this.newMessage = null; |
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| 95 | this.newState = EzcabGlobals.FREE_STATE; |
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| 96 | } |
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| 97 | |
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| 98 | if(this.state == EzcabGlobals.WAITING_STATE){ |
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| 99 | /* if message is not expired */ |
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| 100 | if((noHops - 1) > 0){ |
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| 101 | /* add message to my waiting queue */ |
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| 102 | updateWaitingQueue(); |
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| 103 | if(((long)(Globals.engine.getCrtTime() - ts)/Globals.SECOND * 1000) < EzcabGlobals.TIMEOUT ){ |
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| 104 | this.newMessage = new EzcabRequest(Globals.PROT_EZCAB, EzcabGlobals.REQUEST, idClient, (noHops -1), ts); |
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| 105 | this.waitingMessages.add(req); |
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| 106 | } |
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| 107 | else{ |
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| 108 | this.newMessage = null; |
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| 109 | } |
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| 110 | /* prepare to forward message in next event handler */ |
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| 111 | } |
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| 112 | else{ |
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| 113 | this.newMessage = null; |
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| 114 | } |
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| 115 | /* in this case, state is the same */ |
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| 116 | this.newState = EzcabGlobals.WAITING_STATE; |
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| 117 | } |
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| 118 | if(this.state == EzcabGlobals.FREE_STATE){ |
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| 119 | EzcabRequest requestFromQueue = this.getMessageMaxSendTime(); |
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| 120 | if(requestFromQueue != null){ |
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| 121 | if(requestFromQueue.getTimeOfSending() > ts){ |
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| 122 | this.newMessage = requestFromQueue; |
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| 123 | this.timeOfsending = requestFromQueue.getTimeOfSending(); |
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| 124 | this.clientID = requestFromQueue.getIdClient(); |
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| 125 | |
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| 126 | this.waitingMessages.add(req); |
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| 127 | } |
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| 128 | else{ |
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| 129 | /* make a next message with the response */ |
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| 130 | this.newMessage = new EzcabResponse(Globals.PROT_EZCAB, EzcabGlobals.RESPONSE, this.vehicleId, |
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| 131 | idClient, EzcabGlobals.MAX_HOPS); |
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| 132 | //this.changeInWaitingState = System.currentTimeMillis(); |
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| 133 | this.timeOfsending = ts; |
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| 134 | this.clientID = idClient; |
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| 135 | } |
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| 136 | } |
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| 137 | else{ |
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| 138 | /* make a next message with the response */ |
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| 139 | this.newMessage = new EzcabResponse(Globals.PROT_EZCAB, EzcabGlobals.RESPONSE, this.vehicleId, |
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| 140 | idClient, EzcabGlobals.MAX_HOPS); |
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| 141 | //this.changeInWaitingState = System.currentTimeMillis(); |
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| 142 | this.timeOfsending = ts; |
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| 143 | this.clientID = idClient; |
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| 144 | } |
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| 145 | /* change next state */ |
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| 146 | this.newState = EzcabGlobals.WAITING_STATE; |
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| 147 | } |
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| 148 | |
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| 149 | if(this.state == EzcabGlobals.BUSY_STATE){ |
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| 150 | if((noHops -1) > 0){ |
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| 151 | this.newMessage = new EzcabRequest(Globals.PROT_EZCAB, EzcabGlobals.REQUEST, idClient, (noHops -1), ts); |
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| 152 | } |
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| 153 | else{ |
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| 154 | this.newMessage = null; |
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| 155 | } |
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| 156 | this.newState = EzcabGlobals.BUSY_STATE; |
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| 157 | } |
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| 158 | }//end ezcabRequest |
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| 159 | |
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| 160 | if(message instanceof EzcabAck){ |
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| 161 | EzcabAck ack = (EzcabAck)message; |
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| 162 | noHops = ack.getNoHops(); |
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| 163 | idClient = ack.getIdClient(); |
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| 164 | int idCab = ack.getIdCab(); |
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| 165 | |
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| 166 | if(this.state == EzcabGlobals.WAITING_STATE){ |
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| 167 | |
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| 168 | //if( ((currentTime - this.changeInWaitingState)%Globals.SECOND) > EzcabGlobals.TIMEOUT){ |
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| 169 | if( ((long)(Globals.engine.getCrtTime() - this.timeOfsending)/Globals.SECOND * 1000) > EzcabGlobals.TIMEOUT ){ |
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| 170 | this.changeInWaitingState = 0; |
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| 171 | this.timeOfsending = 0; |
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| 172 | this.clientID = -1; |
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| 173 | this.state = EzcabGlobals.FREE_STATE; |
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| 174 | |
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| 175 | //don't know if is necessary |
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| 176 | this.newMessage = null; |
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| 177 | this.newState = EzcabGlobals.FREE_STATE; |
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| 178 | } |
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| 179 | else{ |
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| 180 | if(this.vehicleId == idCab){//that means is for me yeeeeeyyyy! |
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| 181 | try { |
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| 182 | Engine.bwCab.write(idClient + " " + this.vehicleId + " " + (long)((float)Globals.engine.crtTime)/Globals.SECOND * 1000L + " " + (long)((float)(Globals.engine.crtTime - this.timeOfsending)/Globals.SECOND * 1000L) + "\n"); |
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| 183 | Engine.bwCab.flush(); |
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| 184 | |
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| 185 | } catch (IOException e1) { |
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| 186 | e1.printStackTrace(); |
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| 187 | } |
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| 188 | |
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| 189 | this.newMessage = null; |
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| 190 | this.newState = EzcabGlobals.BUSY_STATE; |
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| 191 | } |
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| 192 | else{ |
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| 193 | if((noHops -1) > 0){ |
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| 194 | this.newMessage = new EzcabAck(Globals.PROT_EZCAB, EzcabGlobals.ACK, idClient, idCab, (noHops - 1)); |
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| 195 | } |
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| 196 | else |
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| 197 | this.newMessage = null; |
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| 198 | this.newState = EzcabGlobals.WAITING_STATE; |
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| 199 | } |
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| 200 | } |
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| 201 | } |
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| 202 | |
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| 203 | if( (this.state == EzcabGlobals.FREE_STATE) |
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| 204 | || (this.state == EzcabGlobals.BUSY_STATE) ){ |
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| 205 | if((noHops -1) > 0){ |
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| 206 | this.newMessage = new EzcabAck(Globals.PROT_EZCAB, EzcabGlobals.ACK, idClient, idCab, (noHops - 1)); |
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| 207 | } |
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| 208 | else |
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| 209 | this.newMessage = null; |
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| 210 | this.newState = this.state; |
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| 211 | } |
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| 212 | }// end ezcabAck |
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| 213 | |
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| 214 | if(message instanceof EzcabResponse){ |
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| 215 | EzcabResponse res = (EzcabResponse)message; |
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| 216 | int idFreeCab = res.getIdFreeCab(); |
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| 217 | idClient = res.getIdClient(); |
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| 218 | noHops = res.getNoHops(); |
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| 219 | |
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| 220 | /* dosn't matter the state of the cab - he only forwards the message */ |
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| 221 | if((noHops -1) > 0){ |
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| 222 | this.newMessage = new EzcabResponse(Globals.PROT_EZCAB, EzcabGlobals.RESPONSE, idFreeCab, idClient, (noHops - 1)); |
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| 223 | } |
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| 224 | else{ |
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| 225 | this.newMessage = null; |
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| 226 | } |
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| 227 | this.newState = this.state; |
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| 228 | }// end ezcabResponse |
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| 229 | |
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| 230 | SendEvent e = new SendEvent(Globals.engine.crtTime, this, Globals.TYPE_EZCAB); |
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| 231 | e.setMessageObject(this.newMessage); |
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| 232 | Globals.engine.schedEvent(e); |
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| 233 | this.state = this.newState; |
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| 234 | } |
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| 235 | |
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| 236 | |
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| 237 | public byte[] prepareMessage(int messageType){ |
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| 238 | |
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| 239 | byte[] bytesToSend=null; |
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| 240 | |
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| 241 | /* update state */ |
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| 242 | this.state = this.newState; |
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| 243 | |
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| 244 | if ( (!isEquipped) || (this.newMessage == null) ) |
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| 245 | return null; |
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| 246 | |
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| 247 | if(messageType == Globals.TYPE_EZCAB){ |
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| 248 | |
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| 249 | /* if is a request message */ |
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| 250 | if(this.newMessage instanceof EzcabRequest){ |
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| 251 | EzcabRequest request = (EzcabRequest)this.newMessage; |
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| 252 | ByteBuffer bb = ByteBuffer.allocate(17); |
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| 253 | |
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| 254 | bb.put(request.getProtType()); //bb.put(Globals.PROT_EZCAB); |
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| 255 | bb.putInt(request.getMessageType()); //bb.putInt(EzcabGlobals.REQUEST); |
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| 256 | bb.putInt(request.getIdClient()); |
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| 257 | bb.putInt(request.getNoHops()); |
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| 258 | bb.putInt(request.getTimeOfSending()); |
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| 259 | |
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| 260 | bytesToSend = bb.array(); |
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| 261 | } |
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| 262 | |
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| 263 | /* if is a response message */ |
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| 264 | if(this.newMessage instanceof EzcabResponse){ |
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| 265 | EzcabResponse response = (EzcabResponse)this.newMessage; |
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| 266 | ByteBuffer bb = ByteBuffer.allocate(17); |
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| 267 | |
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| 268 | bb.put(response.getProtType()); //bb.put(Globals.PROT_EZCAB); |
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| 269 | bb.putInt(response.getMessageType()); //bb.putInt(EzcabGlobals.RESPONSE); |
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| 270 | bb.putInt(response.getIdFreeCab()); |
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| 271 | bb.putInt(response.getIdClient()); |
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| 272 | bb.putInt(response.getNoHops()); |
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| 273 | |
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| 274 | bytesToSend = bb.array(); |
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| 275 | } |
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| 276 | |
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| 277 | /* if is an ack message */ |
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| 278 | if(this.newMessage instanceof EzcabAck){ |
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| 279 | EzcabAck ack = (EzcabAck)this.newMessage; |
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| 280 | ByteBuffer bb = ByteBuffer.allocate(17); |
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| 281 | |
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| 282 | bb.put(ack.getProtType()); //bb.put(Globals.PROT_EZCAB); |
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| 283 | bb.putInt(ack.getMessageType()); //bb.putInt(EzcabGlobals.ACK); |
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| 284 | bb.putInt(ack.getIdClient()); |
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| 285 | bb.putInt(ack.getIdCab()); |
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| 286 | bb.putInt(ack.getNoHops()); |
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| 287 | |
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| 288 | bytesToSend = bb.array(); |
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| 289 | } |
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| 290 | |
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| 291 | return bytesToSend; |
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| 292 | } |
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| 293 | else{ |
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| 294 | return super.prepareMessage(messageType); |
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| 295 | } |
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| 296 | } |
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| 297 | |
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| 298 | /* remove from waiting queue expired messages */ |
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| 299 | public void updateWaitingQueue(){ |
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| 300 | int messageTime; |
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| 301 | |
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| 302 | for(int i = 0; i < this.waitingMessages.size(); i++){ |
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| 303 | messageTime = (int)(this.waitingMessages.get(i)).getTimeOfSending(); |
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| 304 | if( ((long)(Globals.engine.getCrtTime() - messageTime) / Globals.SECOND * 1000) > EzcabGlobals.TIMEOUT) |
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| 305 | this.waitingMessages.remove(i); |
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| 306 | } |
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| 307 | } |
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| 308 | |
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| 309 | public EzcabRequest getMessageMaxSendTime(){ |
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| 310 | int messageTime, maxTime = 0; |
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| 311 | EzcabRequest message = null; |
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| 312 | |
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| 313 | for(int i = 0; i < this.waitingMessages.size(); i++){ |
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| 314 | messageTime = (int)(this.waitingMessages.get(i)).getTimeOfSending(); |
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| 315 | if(messageTime > maxTime){ |
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| 316 | maxTime = messageTime; |
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| 317 | message = this.waitingMessages.get(i); |
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| 318 | } |
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| 319 | } |
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| 320 | |
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| 321 | return message; |
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| 322 | } |
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| 323 | |
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| 324 | } |
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