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 | public class WcfPeerListManager : IPeerListManager {
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11 |
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12 | private string serverString = null;
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13 |
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14 | private PeerInfo myself = null;
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15 |
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16 | private Timer timer = null; //sends heartbeat to contact-server
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17 |
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18 | private Object timerLock = new Object();
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19 |
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20 | private ChannelFactory<IContactService> myChannelFactory;
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21 |
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22 | private IContactService client;
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23 |
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24 | private IContactService heartbeatClient;
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25 |
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26 | private int communicationRate; //how many peers are contacted by this peer in percent
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27 |
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28 | public void Init(PeerInfo source, string contactServerUrl, int communicationRate) {
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29 | serverString = contactServerUrl;
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30 | this.communicationRate = communicationRate;
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31 | myself = source;
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32 | //Init ChannelFactory and Clients
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33 | var binding = new NetTcpBinding();
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34 | var endpoint = new EndpointAddress(serverString);
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35 | myChannelFactory = new ChannelFactory<IContactService>(binding, endpoint);
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36 | client = myChannelFactory.CreateChannel();
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37 | heartbeatClient = myChannelFactory.CreateChannel();
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38 | //Register Peer
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39 | client.RegisterPeer(source);
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40 | //Start heartbeat timer
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41 | timer = new Timer(1000); //each 5 minutes
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42 | timer.Elapsed += SendHeartbeatToServer;
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43 | timer.Start();
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44 | }
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45 |
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46 | public List<PeerInfo> GetPeerList() {
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47 | try {
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48 | var allPeers = client.GetPeerList(myself); //maybe timout exception...
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49 | var peersForMessaging = ChoosePeersForMessaging(allPeers);
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50 | //return peersForMessaging;
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51 | return allPeers; //TODO: Enable 10% list communication
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52 | }
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53 | catch { } //if maybe sending failed (because of connection lost, etc.): just ignore
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54 | return new List<PeerInfo>();
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55 | }
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56 |
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57 | public void SendLogToServer(string msg) {
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58 | client.MakeLog(myself, msg);
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59 | }
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60 |
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61 | public void Dispose() {
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62 | timer.Stop();
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63 | timer.Dispose();
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64 | ((IClientChannel)client).Close();
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65 | ((IClientChannel)heartbeatClient).Close();
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66 | myChannelFactory.Close();
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67 | client = null;
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68 | myChannelFactory = null;
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69 | }
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70 |
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71 |
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72 | private List<PeerInfo> ChoosePeersForMessaging(List<PeerInfo> allPeers) {
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73 | //communicate with 10% of the network
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74 | int noOfPeers = allPeers.Count / (100 / communicationRate);
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75 | List<int> indexList = GetRandomItemIndexes(noOfPeers, 0, allPeers.Count - 1);
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76 | List<PeerInfo> res = new List<PeerInfo>();
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77 | foreach (int index in indexList) {
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78 | res.Add(allPeers.ElementAt(index));
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79 | }
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80 | return allPeers;
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81 | }
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82 |
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83 | private List<int> GetRandomItemIndexes(int noOfItems, int minValue, int maxValue) {
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84 | List<int> res = new List<int>();
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85 | Random rnd = new Random();
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86 | int tmp = -1;
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87 | while (res.Count < noOfItems) {
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88 | tmp = rnd.Next(minValue, maxValue + 1);
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89 | if (!res.Contains(tmp)) {
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90 | res.Add(tmp);
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91 | }
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92 | }
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93 | return res;
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94 | }
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95 |
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96 | private void SendHeartbeatToServer(object sender, ElapsedEventArgs e) {
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97 | lock (timerLock) {
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98 | try {
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99 | heartbeatClient.UpdateHeartbeat(myself);
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100 | }
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101 | catch { } //nothing to do
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102 | }
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103 | }
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104 |
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105 | }
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106 | }
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