1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using System;
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23 | using System.Collections.Generic;
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24 | using System.IO;
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25 | using System.Runtime.CompilerServices;
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26 | using System.ServiceModel;
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27 | using System.Threading;
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28 | using HeuristicLab.Clients.Hive.Slave.ServiceContracts;
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29 | using HeuristicLab.Common;
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30 | using HeuristicLab.Core;
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31 | using HeuristicLab.Services.Hive.Common;
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32 | using HeuristicLab.Services.Hive.Common.DataTransfer;
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33 |
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34 |
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35 | namespace HeuristicLab.Clients.Hive.Slave {
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36 | /// <summary>
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37 | /// The core component of the Hive Client
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38 | /// </summary>
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39 | public class Core : MarshalByRefObject {
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40 | public static bool abortRequested { get; set; }
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41 | private Semaphore waitShutdownSem = new Semaphore(0, 1);
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42 | public static ILog Log { get; set; }
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43 |
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44 | private Dictionary<Guid, Executor> engines = new Dictionary<Guid, Executor>();
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45 | private Dictionary<Guid, AppDomain> appDomains = new Dictionary<Guid, AppDomain>();
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46 | private Dictionary<Guid, Job> jobs = new Dictionary<Guid, Job>();
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47 |
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48 | private WcfService wcfService;
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49 | private HeartbeatManager heartbeatManager;
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50 | private int coreThreadId;
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51 |
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52 | private ISlaveCommunication ClientCom;
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53 | private ServiceHost slaveComm;
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54 |
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55 | public Dictionary<Guid, Executor> ExecutionEngines {
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56 | get { return engines; }
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57 | }
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58 |
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59 | internal Dictionary<Guid, Job> Jobs {
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60 | get { return jobs; }
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61 | }
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62 |
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63 | public Core() {
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64 | }
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65 |
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66 | /// <summary>
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67 | /// Main Method for the client
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68 | /// </summary>
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69 | public void Start() {
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70 | coreThreadId = Thread.CurrentThread.ManagedThreadId;
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71 | abortRequested = false;
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72 |
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73 | //start the client communication service (pipe between slave and slave gui)
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74 | slaveComm = new ServiceHost(typeof(SlaveCommunicationService));
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75 | slaveComm.Open();
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76 |
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77 | ClientCom = SlaveClientCom.Instance.ClientCom;
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78 | ClientCom.LogMessage("Hive Slave started");
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79 |
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80 | ConfigManager manager = ConfigManager.Instance;
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81 | manager.Core = this;
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82 |
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83 | wcfService = WcfService.Instance;
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84 | RegisterServiceEvents();
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85 |
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86 | StartHeartbeats(); // Start heartbeats thread
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87 | DispatchMessageQueue(); // dispatch messages until abortRequested
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88 |
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89 | DeRegisterServiceEvents();
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90 | waitShutdownSem.Release();
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91 | }
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92 |
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93 | private void StartHeartbeats() {
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94 | //Initialize the heartbeat
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95 | heartbeatManager = new HeartbeatManager { Interval = new TimeSpan(0, 0, 10) };
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96 | heartbeatManager.StartHeartbeat();
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97 | }
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98 |
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99 | private void DispatchMessageQueue() {
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100 | MessageQueue queue = MessageQueue.GetInstance();
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101 | while (!abortRequested) {
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102 | MessageContainer container = queue.GetMessage();
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103 | DetermineAction(container);
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104 | }
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105 | }
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106 |
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107 | private void RegisterServiceEvents() {
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108 | WcfService.Instance.Connected += new EventHandler(wcfService_Connected);
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109 | WcfService.Instance.ExceptionOccured += new EventHandler<EventArgs<Exception>>(wcfService_ExceptionOccured);
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110 | }
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111 |
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112 | private void DeRegisterServiceEvents() {
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113 | WcfService.Instance.Connected -= wcfService_Connected;
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114 | WcfService.Instance.ExceptionOccured -= wcfService_ExceptionOccured;
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115 | }
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116 |
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117 | void wcfService_ExceptionOccured(object sender, EventArgs<Exception> e) {
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118 | ClientCom.LogMessage("Connection to server interruped with exception: " + e.Value.Message);
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119 | }
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120 |
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121 | void wcfService_Connected(object sender, EventArgs e) {
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122 | ClientCom.LogMessage("Connected successfully to Hive server");
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123 | }
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124 |
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125 | /// <summary>
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126 | /// Reads and analyzes the Messages from the MessageQueue and starts corresponding actions
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127 | /// </summary>
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128 | /// <param name="container">The Container, containing the message</param>
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129 | private void DetermineAction(MessageContainer container) {
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130 | ClientCom.LogMessage("Message: " + container.Message.ToString() + " for job: " + container.JobId);
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131 | //TODO: find a better solution
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132 | if (container is ExecutorMessageContainer<Guid>) {
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133 | ExecutorMessageContainer<Guid> c = (ExecutorMessageContainer<Guid>)container;
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134 | c.execute();
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135 | } else if (container is MessageContainer) {
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136 | switch (container.Message) {
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137 | //Server requests to abort a job
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138 | case MessageContainer.MessageType.AbortJob:
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139 | if (engines.ContainsKey(container.JobId))
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140 | try {
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141 | engines[container.JobId].Abort();
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142 | }
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143 | catch (AppDomainUnloadedException) {
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144 | // appdomain already unloaded. Finishing job probably ongoing
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145 | } else
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146 | ClientCom.LogMessage("AbortJob: Engine doesn't exist");
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147 | break;
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148 |
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149 | //Pull a Job from the Server
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150 | case MessageContainer.MessageType.AquireJob:
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151 | Job myJob = wcfService.AquireJob();
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152 | //TODO: handle in own thread!!
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153 | JobData jobData = wcfService.GetJobData(myJob.Id);
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154 | StartJobInAppDomain(myJob, jobData);
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155 | break;
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156 |
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157 | //Hard shutdown of the client
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158 | case MessageContainer.MessageType.ShutdownSlave:
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159 | ShutdownCore();
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160 | break;
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161 | case MessageContainer.MessageType.HardPause:
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162 | doHardPause();
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163 | break;
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164 | case MessageContainer.MessageType.SoftPause:
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165 | doSoftPause();
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166 | break;
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167 | case MessageContainer.MessageType.Restart:
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168 | doRestart();
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169 | break;
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170 | }
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171 | } else {
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172 | ClientCom.LogMessage("Unknown MessageContainer: " + container);
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173 | }
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174 | }
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175 |
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176 | /// <summary>
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177 | /// reinitializes everything and continues operation,
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178 | /// can be called after SoftPause() or HardPause()
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179 | /// </summary>
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180 | public void Restart() {
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181 | MessageContainer mc = new MessageContainer(MessageContainer.MessageType.Restart);
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182 | MessageQueue.GetInstance().AddMessage(mc);
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183 | }
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184 |
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185 | private void doRestart() {
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186 | ClientCom.LogMessage("Restart received");
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187 | StartHeartbeats();
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188 | ClientCom.LogMessage("Restart done");
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189 | }
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190 |
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191 | /// <summary>
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192 | /// wait for jobs to finish, then pause client
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193 | /// </summary>
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194 | public void SoftPause() {
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195 | MessageContainer mc = new MessageContainer(MessageContainer.MessageType.SoftPause);
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196 | MessageQueue.GetInstance().AddMessage(mc);
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197 | }
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198 |
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199 | private void doSoftPause() {
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200 | ClientCom.LogMessage("Soft pause received");
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201 |
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202 | //TODO: jobs get removed from Jobs map, is this a problem?
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203 | foreach (Job job in Jobs.Values) {
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204 | engines[job.Id].Pause();
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205 | JobData sJob = engines[job.Id].GetFinishedJob();
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206 | job.Exception = engines[job.Id].CurrentException;
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207 | job.ExecutionTime = engines[job.Id].ExecutionTime;
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208 |
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209 | try {
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210 | ClientCom.LogMessage("Sending the paused job with id: " + job.Id);
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211 | wcfService.UpdateJob(job, sJob);
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212 | SlaveStatusInfo.JobsProcessed++; //TODO: count or not count, thats the question
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213 | }
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214 | catch (Exception e) {
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215 | ClientCom.LogMessage("Transmitting to server failed. Storing the paused job with id: " + job.Id + " to hdd (" + e.ToString() + ")");
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216 | }
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217 | finally {
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218 | KillAppDomain(job.Id); // kill app-domain in every case
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219 | }
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220 | }
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221 |
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222 | heartbeatManager.StopHeartBeat();
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223 | WcfService.Instance.Disconnect();
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224 | ClientCom.LogMessage("Soft pause done");
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225 | }
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226 |
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227 | /// <summary>
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228 | /// pause slave immediately
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229 | /// </summary>
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230 | public void HardPause() {
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231 | MessageContainer mc = new MessageContainer(MessageContainer.MessageType.HardPause);
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232 | MessageQueue.GetInstance().AddMessage(mc);
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233 | }
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234 |
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235 | private void doHardPause() {
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236 | ClientCom.LogMessage("Hard pause received");
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237 | heartbeatManager.StopHeartBeat();
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238 |
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239 | lock (engines) {
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240 | ClientCom.LogMessage("engines locked");
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241 | foreach (KeyValuePair<Guid, AppDomain> kvp in appDomains) {
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242 | ClientCom.LogMessage("Shutting down Appdomain for " + kvp.Key);
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243 | appDomains[kvp.Key].UnhandledException -= new UnhandledExceptionEventHandler(appDomain_UnhandledException);
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244 | AppDomain.Unload(kvp.Value);
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245 | }
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246 | }
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247 | WcfService.Instance.Disconnect();
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248 | ClientCom.LogMessage("Hard pause done");
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249 | }
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250 |
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251 | public void Shutdown() {
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252 | MessageContainer mc = new MessageContainer(MessageContainer.MessageType.ShutdownSlave);
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253 | MessageQueue.GetInstance().AddMessage(mc);
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254 | waitShutdownSem.WaitOne();
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255 | }
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256 |
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257 | /// <summary>
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258 | /// hard shutdown, should be called before the the application is exited
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259 | /// </summary>
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260 | private void ShutdownCore() {
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261 | ClientCom.LogMessage("Shutdown Signal received");
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262 | ClientCom.LogMessage("Stopping heartbeat");
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263 | heartbeatManager.StopHeartBeat();
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264 | abortRequested = true;
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265 | ClientCom.LogMessage("Logging out");
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266 |
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267 |
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268 | lock (engines) {
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269 | ClientCom.LogMessage("engines locked");
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270 | foreach (KeyValuePair<Guid, AppDomain> kvp in appDomains) {
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271 | ClientCom.LogMessage("Shutting down Appdomain for " + kvp.Key);
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272 | appDomains[kvp.Key].UnhandledException -= new UnhandledExceptionEventHandler(appDomain_UnhandledException);
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273 | AppDomain.Unload(kvp.Value);
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274 | }
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275 | }
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276 | WcfService.Instance.Disconnect();
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277 | ClientCom.Shutdown();
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278 | SlaveClientCom.Close();
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279 |
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280 | if (slaveComm.State != CommunicationState.Closed)
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281 | slaveComm.Close();
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282 | }
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283 |
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284 | /// <summary>
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285 | /// Pauses a job, which means sending it to the server and killing it locally;
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286 | /// atm only used when executor is waiting for child jobs
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287 | /// </summary>
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288 | /// <param name="data"></param>
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289 | [MethodImpl(MethodImplOptions.Synchronized)]
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290 | public void PauseJob(JobData data) {
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291 | if (!Jobs.ContainsKey(data.JobId)) {
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292 | ClientCom.LogMessage("Can't find job with id " + data.JobId);
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293 | } else {
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294 | Job job = Jobs[data.JobId];
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295 | job.JobState = JobState.WaitingForChildJobs;
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296 | wcfService.UpdateJob(job, data);
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297 | }
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298 | KillAppDomain(data.JobId);
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299 | }
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300 |
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301 | /// <summary>
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302 | /// serializes the finished job and submits it to the server. If, at the time, a network connection is unavailable, the Job gets stored on the disk.
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303 | /// once the connection gets reestablished, the job gets submitted
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304 | /// </summary>
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305 | /// <param name="jobId"></param>
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306 | [MethodImpl(MethodImplOptions.Synchronized)]
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307 | public void SendFinishedJob(object jobId) {
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308 | try {
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309 | Guid jId = (Guid)jobId;
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310 | ClientCom.LogMessage("Getting the finished job with id: " + jId);
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311 | if (!engines.ContainsKey(jId)) {
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312 | ClientCom.LogMessage("Engine doesn't exist");
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313 | return;
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314 | }
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315 | if (!jobs.ContainsKey(jId)) {
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316 | ClientCom.LogMessage("Job doesn't exist");
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317 | return;
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318 | }
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319 | Job cJob = jobs[jId];
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320 |
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321 | JobData sJob = engines[jId].GetFinishedJob();
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322 | cJob.Exception = engines[jId].CurrentException;
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323 | cJob.ExecutionTime = engines[jId].ExecutionTime;
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324 |
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325 | try {
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326 | ClientCom.LogMessage("Sending the finished job with id: " + jId);
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327 | wcfService.UpdateJob(cJob, sJob);
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328 | SlaveStatusInfo.JobsProcessed++;
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329 | }
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330 | catch (Exception e) {
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331 | ClientCom.LogMessage("Transmitting to server failed. Storing the finished job with id: " + jId + " to hdd (" + e.ToString() + ")");
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332 | }
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333 | finally {
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334 | KillAppDomain(jId); // kill app-domain in every case
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335 | heartbeatManager.AwakeHeartBeatThread();
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336 | }
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337 | }
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338 | catch (Exception e) {
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339 | OnExceptionOccured(e);
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340 | }
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341 | }
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342 |
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343 | /// <summary>
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344 | /// A new Job from the wcfService has been received and will be started within a AppDomain.
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345 | /// </summary>
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346 | /// <param name="sender"></param>
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347 | /// <param name="e"></param>
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348 | private void StartJobInAppDomain(Job myJob, JobData jobData) {
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349 | ClientCom.LogMessage("Received new job with id " + myJob.Id);
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350 | String pluginDir = Path.Combine(PluginCache.Instance.PluginTempBaseDir, myJob.Id.ToString());
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351 | bool pluginsPrepared = false;
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352 |
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353 | try {
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354 | PluginCache.Instance.PreparePlugins(myJob, jobData);
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355 | ClientCom.LogMessage("Plugins fetched for job " + myJob.Id);
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356 | pluginsPrepared = true;
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357 | }
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358 | catch (Exception exception) {
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359 | ClientCom.LogMessage(string.Format("Copying plugins for job {0} failed: {1}", myJob.Id, exception));
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360 | }
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361 |
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362 | if (pluginsPrepared) {
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363 | try {
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364 | AppDomain appDomain = HeuristicLab.PluginInfrastructure.Sandboxing.SandboxManager.CreateAndInitSandbox(myJob.Id.ToString(), pluginDir, Path.Combine(pluginDir, PluginCache.ConfigFileName));
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365 | appDomain.UnhandledException += new UnhandledExceptionEventHandler(appDomain_UnhandledException);
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366 | lock (engines) {
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367 | if (!jobs.ContainsKey(myJob.Id)) {
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368 | jobs.Add(myJob.Id, myJob);
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369 | appDomains.Add(myJob.Id, appDomain);
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370 | ClientCom.LogMessage("Creating AppDomain");
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371 | Executor engine = (Executor)appDomain.CreateInstanceAndUnwrap(typeof(Executor).Assembly.GetName().Name, typeof(Executor).FullName);
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372 | ClientCom.LogMessage("Created AppDomain");
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373 | engine.JobId = myJob.Id;
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374 | engine.core = this;
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375 | ClientCom.LogMessage("Starting Engine for job " + myJob.Id);
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376 | engines.Add(myJob.Id, engine);
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377 | engine.Start(jobData.Data);
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378 | SlaveStatusInfo.JobsFetched++;
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379 | ClientCom.LogMessage("Increment FetchedJobs to:" + SlaveStatusInfo.JobsFetched);
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380 | }
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381 | }
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382 | heartbeatManager.AwakeHeartBeatThread();
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383 | }
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384 | catch (Exception exception) {
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385 | ClientCom.LogMessage("Creating the Appdomain and loading the job failed for job " + myJob.Id);
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386 | ClientCom.LogMessage("Error thrown is: " + exception.ToString());
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387 | KillAppDomain(myJob.Id);
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388 | }
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389 | }
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390 | }
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391 |
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392 | public event EventHandler<EventArgs<Exception>> ExceptionOccured;
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393 | private void OnExceptionOccured(Exception e) {
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394 | ClientCom.LogMessage("Error: " + e.ToString());
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395 | var handler = ExceptionOccured;
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396 | if (handler != null) handler(this, new EventArgs<Exception>(e));
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397 | }
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398 |
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399 | private void appDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e) {
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400 | ClientCom.LogMessage("Exception in AppDomain: " + e.ExceptionObject.ToString());
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401 | KillAppDomain(new Guid(e.ExceptionObject.ToString()));
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402 | }
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403 |
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404 | /// <summary>
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405 | /// Enqueues messages from the executor to the message queue.
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406 | /// This is necessary if the core thread has to execute certain actions, e.g.
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407 | /// killing of an app domain.
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408 | /// </summary>
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409 | /// <typeparam name="T"></typeparam>
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410 | /// <param name="action"></param>
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411 | /// <param name="parameter"></param>
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412 | /// <returns>true if the calling method can continue execution, else false</returns>
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413 | private bool EnqueueExecutorMessage<T>(Action<T> action, T parameter) {
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414 | if (Thread.CurrentThread.ManagedThreadId != this.coreThreadId) {
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415 | ExecutorMessageContainer<T> container = new ExecutorMessageContainer<T>();
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416 | container.Callback = action;
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417 | container.CallbackParameter = parameter;
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418 | MessageQueue.GetInstance().AddMessage(container);
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419 | return false;
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420 | } else {
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421 | return true;
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422 | }
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423 | }
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424 |
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425 | /// <summary>
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426 | /// Kill a appdomain with a specific id.
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427 | /// </summary>
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428 | /// <param name="id">the GUID of the job</param>
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429 | [MethodImpl(MethodImplOptions.Synchronized)]
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430 | public void KillAppDomain(Guid id) {
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431 | if (EnqueueExecutorMessage<Guid>(KillAppDomain, id)) {
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432 | ClientCom.LogMessage("Shutting down Appdomain for Job " + id);
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433 | lock (engines) {
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434 | try {
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435 | if (engines.ContainsKey(id)) {
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436 | engines[id].Dispose();
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437 | engines.Remove(id);
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438 | }
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439 |
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440 | if (appDomains.ContainsKey(id)) {
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441 | appDomains[id].UnhandledException -= new UnhandledExceptionEventHandler(appDomain_UnhandledException);
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442 |
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443 | int repeat = 5;
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444 | while (repeat > 0) {
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445 | try {
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446 | AppDomain.Unload(appDomains[id]);
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447 | repeat = 0;
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448 | }
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449 | catch (CannotUnloadAppDomainException) {
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450 | ClientCom.LogMessage("Could not unload AppDomain, will try again in 1 sec.");
|
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451 | Thread.Sleep(1000);
|
---|
452 | repeat--;
|
---|
453 | if (repeat == 0) {
|
---|
454 | throw; // rethrow and let app crash
|
---|
455 | }
|
---|
456 | }
|
---|
457 | }
|
---|
458 | appDomains.Remove(id);
|
---|
459 | }
|
---|
460 |
|
---|
461 | jobs.Remove(id);
|
---|
462 | PluginCache.Instance.DeletePluginsForJob(id);
|
---|
463 | GC.Collect();
|
---|
464 | }
|
---|
465 | catch (Exception ex) {
|
---|
466 | ClientCom.LogMessage("Exception when unloading the appdomain: " + ex.ToString());
|
---|
467 | }
|
---|
468 | }
|
---|
469 | GC.Collect();
|
---|
470 | }
|
---|
471 | }
|
---|
472 | }
|
---|
473 | }
|
---|