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 |
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41 | //TODO: this class should be a singleton; there is only one instance, the reference is meanwhile save in TheCore
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42 | public static Core TheCore;
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43 |
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44 | public static bool abortRequested { get; set; }
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45 | private Semaphore waitShutdownSem = new Semaphore(0, 1);
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46 | public static ILog Log { get; set; }
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47 |
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48 | private Dictionary<Guid, Executor> engines = new Dictionary<Guid, Executor>();
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49 | private Dictionary<Guid, AppDomain> appDomains = new Dictionary<Guid, AppDomain>();
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50 | private Dictionary<Guid, Job> jobs = new Dictionary<Guid, Job>();
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51 |
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52 | private WcfService wcfService;
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53 | private HeartbeatManager heartbeatManager;
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54 | private int coreThreadId;
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55 |
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56 | private ISlaveCommunication ClientCom;
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57 | private ServiceHost slaveComm;
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58 |
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59 | public Dictionary<Guid, Executor> ExecutionEngines {
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60 | get { return engines; }
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61 | }
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62 |
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63 | internal Dictionary<Guid, Job> Jobs {
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64 | get { return jobs; }
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65 | }
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66 |
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67 | public Core() {
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68 | TheCore = this;
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69 | }
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70 |
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71 | /// <summary>
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72 | /// Main Method for the client
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73 | /// </summary>
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74 | public void Start() {
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75 | coreThreadId = Thread.CurrentThread.ManagedThreadId;
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76 | abortRequested = false;
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77 |
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78 | //start the client communication service (pipe between slave and slave gui)
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79 | slaveComm = new ServiceHost(typeof(SlaveCommunicationService));
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80 | slaveComm.Open();
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81 |
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82 | ClientCom = SlaveClientCom.Instance.ClientCom;
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83 | ClientCom.LogMessage("Hive Slave started");
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84 |
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85 | ConfigManager manager = ConfigManager.Instance;
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86 | manager.Core = this;
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87 |
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88 | wcfService = WcfService.Instance;
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89 | RegisterServiceEvents();
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90 |
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91 | StartHeartbeats(); // Start heartbeats thread
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92 | DispatchMessageQueue(); // dispatch messages until abortRequested
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93 |
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94 | DeRegisterServiceEvents();
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95 | waitShutdownSem.Release();
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96 | }
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97 |
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98 | private void StartHeartbeats() {
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99 | //Initialize the heartbeat
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100 | heartbeatManager = new HeartbeatManager { Interval = new TimeSpan(0, 0, 10) };
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101 | heartbeatManager.StartHeartbeat();
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102 | }
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103 |
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104 | private void DispatchMessageQueue() {
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105 | MessageQueue queue = MessageQueue.GetInstance();
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106 | while (!abortRequested) {
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107 | MessageContainer container = queue.GetMessage();
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108 | DetermineAction(container);
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109 | }
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110 | }
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111 |
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112 | private void RegisterServiceEvents() {
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113 | WcfService.Instance.Connected += new EventHandler(wcfService_Connected);
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114 | WcfService.Instance.ExceptionOccured += new EventHandler<EventArgs<Exception>>(wcfService_ExceptionOccured);
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115 | }
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116 |
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117 | private void DeRegisterServiceEvents() {
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118 | WcfService.Instance.Connected -= wcfService_Connected;
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119 | WcfService.Instance.ExceptionOccured -= wcfService_ExceptionOccured;
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120 | }
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121 |
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122 | void wcfService_ExceptionOccured(object sender, EventArgs<Exception> e) {
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123 | ClientCom.LogMessage("Connection to server interruped with exception: " + e.Value.Message);
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124 | }
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125 |
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126 | void wcfService_Connected(object sender, EventArgs e) {
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127 | ClientCom.LogMessage("Connected successfully to Hive server");
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128 | }
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129 |
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130 | /// <summary>
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131 | /// Reads and analyzes the Messages from the MessageQueue and starts corresponding actions
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132 | /// </summary>
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133 | /// <param name="container">The Container, containing the message</param>
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134 | private void DetermineAction(MessageContainer container) {
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135 | ClientCom.LogMessage("Message: " + container.Message.ToString() + " for job: " + container.JobId);
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136 | //TODO: find a better solution
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137 | if (container is ExecutorMessageContainer<Guid>) {
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138 | ExecutorMessageContainer<Guid> c = (ExecutorMessageContainer<Guid>)container;
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139 | c.execute();
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140 | } else if (container is MessageContainer) {
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141 | switch (container.Message) {
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142 | //Server requests to abort a job
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143 | case MessageContainer.MessageType.AbortJob:
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144 | if (engines.ContainsKey(container.JobId))
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145 | try {
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146 | engines[container.JobId].Abort();
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147 | }
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148 | catch (AppDomainUnloadedException) {
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149 | // appdomain already unloaded. Finishing job probably ongoing
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150 | } else
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151 | ClientCom.LogMessage("AbortJob: Engine doesn't exist");
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152 | break;
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153 |
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154 | //Pull a Job from the Server
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155 | case MessageContainer.MessageType.AquireJob:
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156 | Job myJob = wcfService.AquireJob();
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157 | //TODO: handle in own thread!!
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158 | JobData jobData = wcfService.GetJobData(myJob.Id);
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159 | StartJobInAppDomain(myJob, jobData);
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160 | break;
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161 |
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162 | //Hard shutdown of the client
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163 | case MessageContainer.MessageType.ShutdownSlave:
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164 | ShutdownCore();
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165 | break;
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166 | case MessageContainer.MessageType.HardPause:
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167 | doHardPause();
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168 | break;
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169 | case MessageContainer.MessageType.SoftPause:
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170 | doSoftPause();
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171 | break;
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172 | case MessageContainer.MessageType.Restart:
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173 | doRestart();
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174 | break;
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175 | }
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176 | } else {
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177 | ClientCom.LogMessage("Unknown MessageContainer: " + container);
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178 | }
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179 | }
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180 |
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181 | /// <summary>
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182 | /// reinitializes everything and continues operation,
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183 | /// can be called after SoftPause() or HardPause()
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184 | /// </summary>
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185 | public void Restart() {
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186 | MessageContainer mc = new MessageContainer(MessageContainer.MessageType.Restart);
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187 | MessageQueue.GetInstance().AddMessage(mc);
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188 | }
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189 |
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190 | private void doRestart() {
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191 | ClientCom.LogMessage("Restart received");
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192 | StartHeartbeats();
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193 | ClientCom.LogMessage("Restart done");
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194 | }
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195 |
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196 | /// <summary>
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197 | /// wait for jobs to finish, then pause client
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198 | /// </summary>
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199 | public void SoftPause() {
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200 | MessageContainer mc = new MessageContainer(MessageContainer.MessageType.SoftPause);
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201 | MessageQueue.GetInstance().AddMessage(mc);
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202 | }
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203 |
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204 | private void doSoftPause() {
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205 | ClientCom.LogMessage("Soft pause received");
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206 |
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207 | //TODO: jobs get removed from Jobs map, is this a problem?
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208 | foreach (Job job in Jobs.Values) {
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209 | engines[job.Id].Pause();
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210 | JobData sJob = engines[job.Id].GetFinishedJob();
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211 | job.Exception = engines[job.Id].CurrentException;
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212 | job.ExecutionTime = engines[job.Id].ExecutionTime;
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213 |
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214 | try {
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215 | ClientCom.LogMessage("Sending the paused job with id: " + job.Id);
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216 | wcfService.UpdateJob(job, sJob);
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217 | SlaveStatusInfo.JobsProcessed++; //TODO: count or not count, thats the question
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218 | }
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219 | catch (Exception e) {
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220 | ClientCom.LogMessage("Transmitting to server failed. Storing the paused job with id: " + job.Id + " to hdd (" + e.ToString() + ")");
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221 | }
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222 | finally {
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223 | KillAppDomain(job.Id); // kill app-domain in every case
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224 | }
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225 | }
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226 |
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227 | heartbeatManager.StopHeartBeat();
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228 | WcfService.Instance.Disconnect();
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229 | ClientCom.LogMessage("Soft pause done");
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230 | }
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231 |
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232 | /// <summary>
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233 | /// pause slave immediately
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234 | /// </summary>
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235 | public void HardPause() {
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236 | MessageContainer mc = new MessageContainer(MessageContainer.MessageType.HardPause);
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237 | MessageQueue.GetInstance().AddMessage(mc);
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238 | }
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239 |
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240 | private void doHardPause() {
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241 | ClientCom.LogMessage("Hard pause received");
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242 | heartbeatManager.StopHeartBeat();
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243 |
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244 | lock (engines) {
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245 | ClientCom.LogMessage("engines locked");
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246 | foreach (KeyValuePair<Guid, AppDomain> kvp in appDomains) {
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247 | ClientCom.LogMessage("Shutting down Appdomain for " + kvp.Key);
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248 | appDomains[kvp.Key].UnhandledException -= new UnhandledExceptionEventHandler(appDomain_UnhandledException);
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249 | AppDomain.Unload(kvp.Value);
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250 | }
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251 | }
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252 | WcfService.Instance.Disconnect();
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253 | ClientCom.LogMessage("Hard pause done");
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254 | }
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255 |
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256 | public void Shutdown() {
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257 | MessageContainer mc = new MessageContainer(MessageContainer.MessageType.ShutdownSlave);
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258 | MessageQueue.GetInstance().AddMessage(mc);
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259 | waitShutdownSem.WaitOne();
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260 | }
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261 |
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262 | /// <summary>
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263 | /// hard shutdown, should be called before the the application is exited
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264 | /// </summary>
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265 | private void ShutdownCore() {
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266 | ClientCom.LogMessage("Shutdown Signal received");
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267 | ClientCom.LogMessage("Stopping heartbeat");
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268 | heartbeatManager.StopHeartBeat();
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269 | abortRequested = true;
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270 | ClientCom.LogMessage("Logging out");
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271 |
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272 |
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273 | lock (engines) {
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274 | ClientCom.LogMessage("engines locked");
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275 | foreach (KeyValuePair<Guid, AppDomain> kvp in appDomains) {
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276 | ClientCom.LogMessage("Shutting down Appdomain for " + kvp.Key);
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277 | appDomains[kvp.Key].UnhandledException -= new UnhandledExceptionEventHandler(appDomain_UnhandledException);
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278 | AppDomain.Unload(kvp.Value);
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279 | }
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280 | }
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281 | WcfService.Instance.Disconnect();
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282 | ClientCom.Shutdown();
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283 | SlaveClientCom.Close();
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284 |
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285 | if (slaveComm.State != CommunicationState.Closed)
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286 | slaveComm.Close();
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287 | }
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288 |
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289 | /// <summary>
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290 | /// Pauses a job, which means sending it to the server and killing it locally;
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291 | /// atm only used when executor is waiting for child jobs
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292 | /// </summary>
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293 | /// <param name="data"></param>
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294 | [MethodImpl(MethodImplOptions.Synchronized)]
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295 | public void PauseJob(JobData data) {
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296 | if (!Jobs.ContainsKey(data.JobId)) {
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297 | ClientCom.LogMessage("Can't find job with id " + data.JobId);
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298 | } else {
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299 | Job job = Jobs[data.JobId];
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300 | job.JobState = JobState.WaitingForChildJobs;
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301 | wcfService.UpdateJob(job, data);
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302 | }
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303 | KillAppDomain(data.JobId);
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304 | }
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305 |
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306 | /// <summary>
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307 | /// 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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308 | /// once the connection gets reestablished, the job gets submitted
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309 | /// </summary>
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310 | /// <param name="jobId"></param>
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311 | [MethodImpl(MethodImplOptions.Synchronized)]
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312 | public void SendFinishedJob(object jobId) {
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313 | try {
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314 | Guid jId = (Guid)jobId;
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315 | ClientCom.LogMessage("Getting the finished job with id: " + jId);
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316 | if (!engines.ContainsKey(jId)) {
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317 | ClientCom.LogMessage("Engine doesn't exist");
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318 | return;
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319 | }
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320 | if (!jobs.ContainsKey(jId)) {
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321 | ClientCom.LogMessage("Job doesn't exist");
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322 | return;
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323 | }
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324 | Job cJob = jobs[jId];
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325 |
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326 | JobData sJob = engines[jId].GetFinishedJob();
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327 | cJob.Exception = engines[jId].CurrentException;
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328 | cJob.ExecutionTime = engines[jId].ExecutionTime;
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329 |
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330 | try {
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331 | ClientCom.LogMessage("Sending the finished job with id: " + jId);
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332 | wcfService.UpdateJob(cJob, sJob);
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333 | SlaveStatusInfo.JobsProcessed++;
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334 | }
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335 | catch (Exception e) {
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336 | ClientCom.LogMessage("Transmitting to server failed. Storing the finished job with id: " + jId + " to hdd (" + e.ToString() + ")");
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337 | }
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338 | finally {
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339 | KillAppDomain(jId); // kill app-domain in every case
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340 | heartbeatManager.AwakeHeartBeatThread();
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341 | }
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342 | }
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343 | catch (Exception e) {
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344 | OnExceptionOccured(e);
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345 | }
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346 | }
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347 |
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348 | /// <summary>
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349 | /// A new Job from the wcfService has been received and will be started within a AppDomain.
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350 | /// </summary>
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351 | /// <param name="sender"></param>
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352 | /// <param name="e"></param>
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353 | private void StartJobInAppDomain(Job myJob, JobData jobData) {
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354 | ClientCom.LogMessage("Received new job with id " + myJob.Id);
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355 | String pluginDir = Path.Combine(PluginCache.Instance.PluginTempBaseDir, myJob.Id.ToString());
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356 | bool pluginsPrepared = false;
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357 |
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358 | try {
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359 | PluginCache.Instance.PreparePlugins(myJob, jobData);
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360 | ClientCom.LogMessage("Plugins fetched for job " + myJob.Id);
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361 | pluginsPrepared = true;
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362 | }
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363 | catch (Exception exception) {
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364 | ClientCom.LogMessage(string.Format("Copying plugins for job {0} failed: {1}", myJob.Id, exception));
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365 | }
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366 |
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367 | if (pluginsPrepared) {
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368 | try {
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369 | AppDomain appDomain = HeuristicLab.PluginInfrastructure.Sandboxing.SandboxManager.CreateAndInitSandbox(myJob.Id.ToString(), pluginDir, Path.Combine(pluginDir, PluginCache.ConfigFileName));
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370 | appDomain.UnhandledException += new UnhandledExceptionEventHandler(appDomain_UnhandledException);
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371 | lock (engines) {
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372 | if (!jobs.ContainsKey(myJob.Id)) {
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373 | jobs.Add(myJob.Id, myJob);
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374 | appDomains.Add(myJob.Id, appDomain);
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375 | ClientCom.LogMessage("Creating AppDomain");
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376 | Executor engine = (Executor)appDomain.CreateInstanceAndUnwrap(typeof(Executor).Assembly.GetName().Name, typeof(Executor).FullName);
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377 | ClientCom.LogMessage("Created AppDomain");
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378 | engine.JobId = myJob.Id;
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379 | engine.core = this;
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380 | ClientCom.LogMessage("Starting Engine for job " + myJob.Id);
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381 | engines.Add(myJob.Id, engine);
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382 | engine.Start(jobData.Data);
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383 | SlaveStatusInfo.JobsFetched++;
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384 | ClientCom.LogMessage("Increment FetchedJobs to:" + SlaveStatusInfo.JobsFetched);
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385 | }
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386 | }
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387 | heartbeatManager.AwakeHeartBeatThread();
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388 | }
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389 | catch (Exception exception) {
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390 | ClientCom.LogMessage("Creating the Appdomain and loading the job failed for job " + myJob.Id);
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391 | ClientCom.LogMessage("Error thrown is: " + exception.ToString());
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392 | KillAppDomain(myJob.Id);
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393 | }
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394 | }
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395 | }
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396 |
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397 | public event EventHandler<EventArgs<Exception>> ExceptionOccured;
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398 | private void OnExceptionOccured(Exception e) {
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399 | ClientCom.LogMessage("Error: " + e.ToString());
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400 | var handler = ExceptionOccured;
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401 | if (handler != null) handler(this, new EventArgs<Exception>(e));
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402 | }
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403 |
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404 | private void appDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e) {
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405 | ClientCom.LogMessage("Exception in AppDomain: " + e.ExceptionObject.ToString());
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406 | KillAppDomain(new Guid(e.ExceptionObject.ToString()));
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407 | }
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408 |
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409 | /// <summary>
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410 | /// Enqueues messages from the executor to the message queue.
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411 | /// This is necessary if the core thread has to execute certain actions, e.g.
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412 | /// killing of an app domain.
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413 | /// </summary>
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414 | /// <typeparam name="T"></typeparam>
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415 | /// <param name="action"></param>
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416 | /// <param name="parameter"></param>
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417 | /// <returns>true if the calling method can continue execution, else false</returns>
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418 | private bool EnqueueExecutorMessage<T>(Action<T> action, T parameter) {
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419 | if (Thread.CurrentThread.ManagedThreadId != this.coreThreadId) {
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420 | ExecutorMessageContainer<T> container = new ExecutorMessageContainer<T>();
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421 | container.Callback = action;
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422 | container.CallbackParameter = parameter;
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423 | MessageQueue.GetInstance().AddMessage(container);
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424 | return false;
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425 | } else {
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426 | return true;
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427 | }
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428 | }
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429 |
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430 | /// <summary>
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431 | /// Kill a appdomain with a specific id.
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432 | /// </summary>
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433 | /// <param name="id">the GUID of the job</param>
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434 | [MethodImpl(MethodImplOptions.Synchronized)]
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435 | public void KillAppDomain(Guid id) {
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436 | if (EnqueueExecutorMessage<Guid>(KillAppDomain, id)) {
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437 | ClientCom.LogMessage("Shutting down Appdomain for Job " + id);
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438 | lock (engines) {
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439 | try {
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440 | if (engines.ContainsKey(id)) {
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441 | engines[id].Dispose();
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442 | engines.Remove(id);
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443 | }
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444 |
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445 | if (appDomains.ContainsKey(id)) {
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446 | appDomains[id].UnhandledException -= new UnhandledExceptionEventHandler(appDomain_UnhandledException);
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447 |
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448 | int repeat = 5;
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449 | while (repeat > 0) {
|
---|
450 | try {
|
---|
451 | AppDomain.Unload(appDomains[id]);
|
---|
452 | repeat = 0;
|
---|
453 | }
|
---|
454 | catch (CannotUnloadAppDomainException) {
|
---|
455 | ClientCom.LogMessage("Could not unload AppDomain, will try again in 1 sec.");
|
---|
456 | Thread.Sleep(1000);
|
---|
457 | repeat--;
|
---|
458 | if (repeat == 0) {
|
---|
459 | throw; // rethrow and let app crash
|
---|
460 | }
|
---|
461 | }
|
---|
462 | }
|
---|
463 | appDomains.Remove(id);
|
---|
464 | }
|
---|
465 |
|
---|
466 | jobs.Remove(id);
|
---|
467 | PluginCache.Instance.DeletePluginsForJob(id);
|
---|
468 | GC.Collect();
|
---|
469 | }
|
---|
470 | catch (Exception ex) {
|
---|
471 | ClientCom.LogMessage("Exception when unloading the appdomain: " + ex.ToString());
|
---|
472 | }
|
---|
473 | }
|
---|
474 | GC.Collect();
|
---|
475 | }
|
---|
476 | }
|
---|
477 | }
|
---|
478 | }
|
---|