[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.services; |
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| 7 | |
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| 8 | |
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| 9 | import java.util.*; |
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| 10 | |
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| 11 | import vnsim.applications.trafficview.SimulatedCarInfo; |
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| 12 | import vnsim.applications.vitp.peer.*; |
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| 13 | import vnsim.applications.vitp.utils.*; |
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| 14 | import vnsim.map.object.*; |
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| 15 | |
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| 16 | |
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| 17 | |
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| 18 | public class MessageProcessServices { |
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| 19 | |
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| 20 | //this module keeps a list of all registered services (modules that know how |
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| 21 | //to serve a particular VITPRequest); this module just dispatches the VITP Request |
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| 22 | //to the appropriate module |
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| 23 | |
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| 24 | HashMap<String, Service> servicesMap; |
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| 25 | SimulatedCarInfo car; |
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| 26 | |
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| 27 | public MessageProcessServices(SimulatedCarInfo car) { |
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| 28 | this.car=car; |
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| 29 | servicesMap=new HashMap<String, Service>(); |
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| 30 | servicesMap.put("/vehicle/traffic", new VehicleTraffic(car)); |
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| 31 | servicesMap.put("/Road/Info", new RouteInfo(car)); |
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| 32 | servicesMap.put("/Route/Time", new RouteTime(car)); |
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| 33 | |
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| 34 | |
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| 35 | |
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| 36 | } |
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| 37 | |
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| 38 | public void addService(String name, Service s) { |
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| 39 | servicesMap.put(name,s); |
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| 40 | } |
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| 41 | |
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| 42 | public void remove(String name){ |
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| 43 | servicesMap.remove(name); |
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| 44 | } |
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| 45 | |
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| 46 | public VITPMessage satisfy(VITPRequest req){ |
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| 47 | //tries to find an appropriate Service, in order to serve |
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| 48 | //the request; returns the modified message (it could be a |
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| 49 | //modified request, or a new reply, built as a result of the |
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| 50 | //complete fulfilling of a request) |
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| 51 | String serviceName="/"+URIParser.getType(req.getURI())+"/"+URIParser.getTag(req.getURI()); |
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| 52 | Service s=(Service)(servicesMap.get(serviceName)); |
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| 53 | if(s==null) { |
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| 54 | System.out.println("MessageProcessServices - no service found for:"+serviceName); |
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| 55 | return req; |
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| 56 | } |
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| 57 | |
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| 58 | |
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| 59 | HashMap<String, String> params=new HashMap<String, String>(); |
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| 60 | params.put("speed", ""+car.getSpeed()); |
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| 61 | |
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| 62 | |
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| 63 | VITPRequest ret=s.satisfy(req, params); |
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| 64 | //check for the completion of the return condition; if true, build a reply |
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| 65 | if(!checkForCompletion(ret)) { |
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| 66 | //System.out.println("MPS-sending:"+ret); |
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| 67 | return ret; |
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| 68 | } else { |
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| 69 | //change it into a reply = invert source and destination; set REPLY |
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| 70 | VITPReply repret=ret.getReversedVITP(); |
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| 71 | repret.setStatus("OK"); |
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| 72 | return repret; |
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| 73 | } |
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| 74 | } |
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| 75 | |
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| 76 | private boolean checkForCompletion(VITPRequest req) { |
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| 77 | //check if the cnt field is 0 |
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| 78 | Vector rcs=URIParser.getRCExpressions(req.getURI()); |
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| 79 | if(rcs==null) return true; //no cnt field; consider completed |
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| 80 | for(int i=0;i<rcs.size();i++){ |
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| 81 | if(((String)rcs.elementAt(i)).startsWith("cnt")) { |
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| 82 | String cntSir=(String)rcs.elementAt(i); |
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| 83 | int i1=cntSir.indexOf('='); |
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| 84 | if(i1==-1) return false; |
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| 85 | Integer n=new Integer(cntSir.substring(i1+1)); |
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| 86 | if(n.intValue()==0) |
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| 87 | return true; |
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| 88 | else |
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| 89 | return false; |
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| 90 | } |
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| 91 | } |
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| 92 | return false; |
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| 93 | } |
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| 94 | } |
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