[31] | 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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