1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Linq;
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4 | using System.ServiceModel;
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5 | using DistributedGA.Core.Domain;
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6 | using DistributedGA.Core.Interface;
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7 | using System.Timers;
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8 |
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9 | namespace DistributedGA.Core.Implementation
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10 | {
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11 | public class WcfPeerListManager : IPeerListManager
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12 | {
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13 | private string serverString = null;
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14 |
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15 | private IContactService client = null;
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16 |
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17 | private IContactService heartbeatClient = null;
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18 |
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19 | private PeerInfo myself = null;
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20 |
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21 | private Timer timer = null; //sends heartbeat to contact-server
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22 |
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23 | public void Init(PeerInfo source, string contactServerUrl)
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24 | {
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25 | serverString = contactServerUrl;
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26 | client = CreateClient();
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27 | heartbeatClient = CreateClient();
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28 | myself = source;
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29 | client.RegisterPeer(source);
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30 | timer = new Timer(1000 ); //each 5 minutes
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31 | timer.Elapsed += SendHeartbeatToServer;
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32 | timer.Start();
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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 | public List<PeerInfo> GetPeerList()
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38 | {
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39 | var allPeers = client.GetPeerList(myself);
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40 | var peersForMessaging = ChoosePeersForMessaging(allPeers);
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41 | //return peersForMessaging;
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42 | return allPeers; //TODO: Enable 10% list communication
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43 | }
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44 |
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45 | public void SendLogToServer(string msg)
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46 | {
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47 | client.MakeLog(myself, msg);
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48 | }
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49 |
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50 | private IContactService CreateClient()
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51 | {
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52 | var binding = new NetTcpBinding();
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53 | var endpoint = new EndpointAddress(serverString);
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54 | var myChannelFactory = new ChannelFactory<IContactService>(binding, endpoint);
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55 |
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56 | IContactService client = null;
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57 | client = myChannelFactory.CreateChannel();
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58 | return client;
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59 | }
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60 |
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61 | private List<PeerInfo> ChoosePeersForMessaging(List<PeerInfo> allPeers)
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62 | {
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63 | //communicate with 10% of the network
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64 | int noOfPeers = allPeers.Count / 10;
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65 | List<int> indexList = GetRandomItemIndexes(noOfPeers, 0, allPeers.Count - 1);
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66 | List<PeerInfo> res = new List<PeerInfo>();
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67 | foreach (int index in indexList)
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68 | {
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69 | res.Add(allPeers.ElementAt(index));
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70 | }
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71 | return res;
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72 | }
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73 |
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74 | private List<int> GetRandomItemIndexes(int noOfItems, int minValue, int maxValue)
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75 | {
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76 | List<int> res = new List<int>();
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77 | Random rnd = new Random();
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78 | int tmp = -1;
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79 | while (res.Count < noOfItems)
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80 | {
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81 | tmp = rnd.Next(minValue, maxValue);
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82 | if (!res.Contains(tmp))
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83 | {
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84 | res.Add(tmp);
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85 | }
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86 | }
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87 | return res;
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88 | }
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89 |
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90 | private void SendHeartbeatToServer(object sender, ElapsedEventArgs e)
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91 | {
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92 | try
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93 | {
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94 | heartbeatClient.UpdateHeartbeat(myself);
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95 | }
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96 | catch { } //nothing to do, exception is raised when getting peer list
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97 | }
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98 |
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99 | }
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100 | }
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