1 | using System;
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2 | using System.Collections.Concurrent;
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3 | using System.Collections.Generic;
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4 | using System.Linq;
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5 | using System.Net;
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6 | using DistributedGA.Core.Domain;
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7 | using DistributedGA.Core.Interface;
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8 | using DistributedGA.Core.Util;
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9 |
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10 | namespace DistributedGA.Core.Implementation {
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11 | public class PeerNetworkMessageHandler : IMessageHandler {
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12 | //own peer-instance Information
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13 | private PeerInfo ownInstance = null;
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14 |
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15 | //uses peer-list from IPeerListManager to decide which peers to contact
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16 | private IPeerListManager peerListManager;
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17 |
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18 | //uses IMessageSender to send populations to peers
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19 | private IMessageSender sender = null;
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20 |
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21 | //provides current population for the higher layer IMigrationOperator
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22 | //two queues are used to gather and and provide population more efficiently
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23 | private object activeQueueLocker = new Object();
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24 | private SizedConcurrentQueue<byte[]> writeQueue;
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25 | private SizedConcurrentQueue<byte[]> readQueue;
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26 |
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27 | //uses IMessageService for recieving population from one peer at once
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28 | private IMessageService host = null;
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29 |
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30 |
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31 | public void Init(string lanIpPrefix, string contactServerUrl, string problemInstance, int messageCacheCapacity, double communicationRate) {
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32 | try {
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33 | ownInstance = new PeerInfo() {
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34 | IpAddress = GetInternalIpAddress(lanIpPrefix),
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35 | Port = 0,
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36 | ProblemInstance = problemInstance
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37 | }; // TODO: get own peerinfo
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38 |
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39 | writeQueue = new SizedConcurrentQueue<byte[]>();
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40 | readQueue = new SizedConcurrentQueue<byte[]>();
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41 | writeQueue.Limit = messageCacheCapacity;
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42 | readQueue.Limit = writeQueue.Limit;
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43 |
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44 | host = new WcfMessageService();
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45 | ownInstance.Port = host.Init(ownInstance.IpAddress); //getting port, on which service is hostet
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46 | host.OnDataRecieved += new EventHandler<MessageRecieveEventArgs>(OnDataRecieved);
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47 |
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48 | peerListManager = new WcfPeerListManager();
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49 | peerListManager.Init(ownInstance, contactServerUrl, communicationRate);
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50 |
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51 | sender = new WcfMessageSender();
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52 | sender.Init(ownInstance, messageCacheCapacity);
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53 |
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54 | }
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55 | catch (Exception ex) {
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56 | AddError("PeerNetworkMessageHandler.Init", ex);
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57 | }
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58 | }
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59 |
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60 | public void Dispose() {
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61 | try {
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62 | host.Dispose();
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63 | sender.Dispose();
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64 | peerListManager.Dispose();
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65 | }
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66 | catch (Exception ex) {
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67 | AddError("PeerNetworkMessageHandler.Dispose", ex);
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68 | }
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69 | }
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70 |
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71 | public void PublishDataToNetwork(byte[][] data) {
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72 | try {
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73 | foreach (PeerInfo peer in peerListManager.GetPeerList()) {
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74 | //maybe something will go wrong during network communication...
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75 | try {
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76 | sender.SendData(peer, data);
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77 | }
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78 | catch (Exception ex) {
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79 | AddError("PeerNetworkMessageHandler.PublishDataToNetwork(during sending to one peer!)", ex);
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80 | }
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81 | }
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82 | }
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83 | catch (Exception ex) {
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84 | AddError("PeerNetworkMessageHandler.PublishDataToNetwork", ex);
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85 | }
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86 | }
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87 |
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88 | public byte[][] GetDataFromNetwork() {
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89 | try {
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90 | List<byte[]> res = new List<byte[]>();
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91 | byte[] item = null;
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92 | lock (activeQueueLocker) {
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93 | //changing the current queue for storing items to send
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94 | //then read from the now unselect queue
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95 | var tmp = readQueue;
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96 | readQueue = writeQueue;
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97 | writeQueue = tmp;
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98 | }
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99 |
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100 | //creating resultset
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101 | while (!readQueue.IsEmpty) {
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102 | if (readQueue.TryDequeue(out item)) {
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103 | res.Add(item);
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104 | }
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105 | }
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106 | return res.ToArray();
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107 | }
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108 | catch (Exception ex) {
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109 | AddError("PeerNetworkMessageHandler.GetDataFromNetwork", ex);
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110 | return null;
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111 | }
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112 | }
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113 |
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114 | public PeerInfo GetPeerInfo() {
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115 | return ownInstance;
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116 | }
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117 |
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118 | public List<PeerInfo> GetCurrentNetwork() {
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119 | return peerListManager.GetPeerList();
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120 | }
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121 |
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122 | private string GetInternalIpAddress(string ipPrefix) {
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123 | try {
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124 | var strHostName = Dns.GetHostName();
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125 | // Then using host name, get the IP address list..
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126 | IPHostEntry ipEntry = Dns.GetHostEntry(strHostName);
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127 | IPAddress[] addr = ipEntry.AddressList;
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128 |
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129 | return addr
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130 | .Select(ip => ip.ToString())
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131 | .First(str => str.StartsWith(ipPrefix));
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132 | }
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133 | catch { return null; }
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134 | }
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135 |
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136 | private void OnDataRecieved(object sender, MessageRecieveEventArgs e) {
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137 | if (e != null && e.Sender.ProblemInstance.Equals(ownInstance.ProblemInstance)) {
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138 | lock (activeQueueLocker) {
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139 | foreach (byte[] item in e.data) {
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140 | writeQueue.Enqueue(item);
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141 | }
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142 | }
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143 |
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144 | }
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145 | }
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146 |
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147 | private void AddError(string source, Exception ex) {
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148 | if (peerListManager != null) {
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149 | try {
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150 | peerListManager.SendLogToServer(string.Concat("Source: ", source, ", Exception: ", ex.Message));
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151 | }
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152 | catch { }
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153 | }
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154 | }
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155 |
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156 | }
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157 | }
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