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.peer; |
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7 | |
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8 | import vnsim.applications.vitp.routing.*; |
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9 | import vnsim.applications.vitp.services.*; |
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10 | import vnsim.applications.vitp.ui.*; |
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11 | import vnsim.applications.vitp.utils.*; |
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12 | |
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13 | public class Peer { |
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14 | |
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15 | //a peer module, comunicating with a routing module (the layer below), |
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16 | //a user interface (the layer above) and a services module, in order to |
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17 | //properly serve VITP Requests |
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18 | |
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19 | public RoutingModule routingModule; |
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20 | private MessageProcessServices servicesModule; |
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21 | private UserInterface userInterfaceModule; |
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22 | |
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23 | public void attachModules(RoutingModule r, MessageProcessServices s, UserInterface ui){ |
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24 | this.routingModule=r; |
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25 | this.servicesModule=s; |
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26 | this.userInterfaceModule=ui; |
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27 | } |
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28 | |
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29 | public boolean postMessageFromBelow(VITPMessage msg){ |
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30 | //method to be called by the module below, in order to send a message |
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31 | //to this peer; returns true if the peer properly deals with the packet, |
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32 | //false otherwise |
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33 | |
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34 | //this peer has received a packet; there are several possibilities; |
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35 | |
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36 | //it could be a POST request or a reply; in that case, since it was |
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37 | //delivered to me by the routing layer, it is for the local node, |
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38 | //so it has to be delivered to the user interface |
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39 | |
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40 | //finally, it could be a GET request, in which case I have to try and satisfy |
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41 | //it, by using the services |
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42 | |
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43 | if(msg.isReply()) { |
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44 | return userInterfaceModule.postMessage(msg); |
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45 | } |
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46 | if(msg.isRequest()) { |
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47 | try{ |
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48 | VITPRequest req=(VITPRequest)msg; |
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49 | if(req.isPost()) { |
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50 | //return userInterfaceModule.postMessage(msg); |
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51 | userInterfaceModule.postMessage(msg); |
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52 | return routingModule.postMessageFromAbove(msg); |
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53 | } else { |
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54 | if(req.isGet()){ |
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55 | //use the services to try and satisfy this request |
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56 | VITPMessage mes=servicesModule.satisfy(req); |
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57 | return routingModule.postMessageFromAbove(mes); |
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58 | } else { |
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59 | System.out.println("ERROR! Unknown method:="+req.getMethod()); |
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60 | return false; |
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61 | } |
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62 | } |
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63 | } catch (Exception ex){ |
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64 | System.out.println("PEER_EXCEPTION:"+ex.toString()); |
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65 | ex.printStackTrace(); |
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66 | return false; |
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67 | } |
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68 | } |
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69 | System.out.println("Discarding! Peer.postMessage could not decide on the following message:"+msg); |
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70 | System.out.println("***"); |
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71 | return false; |
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72 | } |
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73 | |
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74 | public boolean postMessageFromAbove(VITPMessage msg){ |
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75 | //method to be called by the module above, in order to send a message |
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76 | //to this peer; returns true if the peer properly deals with the packet, |
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77 | //false otherwise |
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78 | |
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79 | //this peer has received a message from the user interface; it should be |
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80 | //a request |
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81 | if(msg.isRequest()) { |
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82 | msg.setMsgIdInval(); //invalidate the id; thus, the routing module will |
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83 | //see the invalid id, and provide it a new one |
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84 | return routingModule.postMessageFromAbove(msg); |
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85 | } |
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86 | return false; |
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87 | } |
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88 | } |
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