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.Diagnostics;
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25 | using System.IO;
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26 | using System.Runtime.CompilerServices;
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27 | using System.ServiceModel;
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28 | using System.Threading;
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29 | using System.Threading.Tasks;
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30 | using HeuristicLab.Clients.Hive.SlaveCore.ServiceContracts;
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31 | using HeuristicLab.Common;
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32 | using HeuristicLab.Core;
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33 |
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34 |
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35 |
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36 | namespace HeuristicLab.Clients.Hive.SlaveCore {
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37 | /// <summary>
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38 | /// The core component of the Hive Client
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39 | /// </summary>
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40 | public class Core : MarshalByRefObject {
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41 |
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42 | //TODO: this class should be a singleton; there is only one instance, the reference is meanwhile save in TheCore
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43 | public static Core TheCore;
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44 |
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45 | public EventLog ServiceEventLog { get; set; }
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46 |
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47 | public static bool abortRequested { get; set; }
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48 | private Semaphore waitShutdownSem = new Semaphore(0, 1);
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49 | public static ILog Log { get; set; }
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50 |
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51 | private Dictionary<Guid, Executor> engines = new Dictionary<Guid, Executor>();
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52 | private Dictionary<Guid, AppDomain> appDomains = new Dictionary<Guid, AppDomain>();
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53 | private Dictionary<Guid, Job> jobs = new Dictionary<Guid, Job>();
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54 |
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55 | private WcfService wcfService;
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56 | private HeartbeatManager heartbeatManager;
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57 | private int coreThreadId;
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58 |
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59 | private ISlaveCommunication ClientCom;
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60 | private ServiceHost slaveComm;
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61 |
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62 | public Dictionary<Guid, Executor> ExecutionEngines {
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63 | get { return engines; }
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64 | }
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65 |
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66 | internal Dictionary<Guid, Job> Jobs {
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67 | get { return jobs; }
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68 | }
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69 |
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70 | public Core() {
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71 | TheCore = this;
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72 | }
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73 |
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74 | /// <summary>
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75 | /// Main Method for the client
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76 | /// </summary>
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77 | public void Start() {
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78 | coreThreadId = Thread.CurrentThread.ManagedThreadId;
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79 | abortRequested = false;
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80 |
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81 | try {
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82 | //start the client communication service (pipe between slave and slave gui)
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83 | slaveComm = new ServiceHost(typeof(SlaveCommunicationService));
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84 | slaveComm.Open();
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85 |
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86 | ClientCom = SlaveClientCom.Instance.ClientCom;
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87 | ClientCom.LogMessage("Hive Slave started");
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88 |
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89 | ConfigManager manager = ConfigManager.Instance;
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90 | manager.Core = this;
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91 |
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92 | wcfService = WcfService.Instance;
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93 | RegisterServiceEvents();
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94 |
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95 | StartHeartbeats(); // Start heartbeats thread
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96 | DispatchMessageQueue(); // dispatch messages until abortRequested
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97 | }
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98 | catch (Exception ex) {
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99 | if (ServiceEventLog != null) {
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100 | try {
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101 | ServiceEventLog.WriteEntry("Hive Slave threw exception: " + ex.ToString() + " with stack trace: " + ex.StackTrace);
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102 | }
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103 | catch (Exception) { }
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104 | } else {
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105 | throw ex;
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106 | }
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107 | }
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108 | finally {
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109 | DeRegisterServiceEvents();
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110 | waitShutdownSem.Release();
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111 | }
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112 | }
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113 |
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114 | private void StartHeartbeats() {
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115 | //Initialize the heartbeat
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116 | if (heartbeatManager != null) {
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117 | heartbeatManager = new HeartbeatManager { Interval = new TimeSpan(0, 0, 10) };
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118 | heartbeatManager.StartHeartbeat();
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119 | }
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120 | }
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121 |
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122 | private void DispatchMessageQueue() {
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123 | MessageQueue queue = MessageQueue.GetInstance();
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124 | while (!abortRequested) {
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125 | MessageContainer container = queue.GetMessage();
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126 | DetermineAction(container);
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127 | }
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128 | }
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129 |
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130 | private void RegisterServiceEvents() {
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131 | WcfService.Instance.Connected += new EventHandler(WcfService_Connected);
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132 | WcfService.Instance.ExceptionOccured += new EventHandler<EventArgs<Exception>>(WcfService_ExceptionOccured);
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133 | }
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134 |
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135 | private void DeRegisterServiceEvents() {
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136 | WcfService.Instance.Connected -= WcfService_Connected;
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137 | WcfService.Instance.ExceptionOccured -= WcfService_ExceptionOccured;
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138 | }
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139 |
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140 | void WcfService_ExceptionOccured(object sender, EventArgs<Exception> e) {
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141 | ClientCom.LogMessage("Connection to server interruped with exception: " + e.Value.Message);
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142 | }
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143 |
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144 | void WcfService_Connected(object sender, EventArgs e) {
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145 | ClientCom.LogMessage("Connected successfully to Hive server");
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146 | }
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147 |
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148 | /// <summary>
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149 | /// Reads and analyzes the Messages from the MessageQueue and starts corresponding actions
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150 | /// </summary>
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151 | /// <param name="container">The Container, containing the message</param>
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152 | private void DetermineAction(MessageContainer container) {
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153 | ClientCom.LogMessage("Message: " + container.Message.ToString() + " for job: " + container.JobId);
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154 |
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155 | if (container is ExecutorMessageContainer<Guid>) {
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156 | ExecutorMessageContainer<Guid> c = (ExecutorMessageContainer<Guid>)container;
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157 | c.execute();
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158 | } else if (container is MessageContainer) {
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159 | switch (container.Message) {
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160 | case MessageContainer.MessageType.CalculateJob:
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161 | Task.Factory.StartNew(() => {
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162 | Job job = wcfService.GetJob(container.JobId);
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163 | lock (engines) {
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164 | if (!jobs.ContainsKey(job.Id)) {
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165 | jobs.Add(job.Id, job);
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166 | }
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167 | }
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168 | JobData jobData = wcfService.GetJobData(job.Id);
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169 | job = wcfService.UpdateJobState(job.Id, JobState.Calculating, null);
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170 | StartJobInAppDomain(job, jobData);
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171 | });
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172 | break;
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173 | case MessageContainer.MessageType.ShutdownSlave:
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174 | ShutdownCore();
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175 | break;
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176 | case MessageContainer.MessageType.StopAll:
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177 | DoStopAll();
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178 | break;
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179 | case MessageContainer.MessageType.PauseAll:
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180 | DoPauseAll();
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181 | break;
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182 | case MessageContainer.MessageType.AbortAll:
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183 | DoAbortAll();
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184 | break;
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185 | case MessageContainer.MessageType.AbortJob:
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186 | KillAppDomain(container.JobId);
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187 | break;
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188 | case MessageContainer.MessageType.StopJob:
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189 | DoStopJob(container.JobId);
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190 | break;
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191 | case MessageContainer.MessageType.PauseJob:
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192 | DoPauseJob(container.JobId);
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193 | break;
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194 | case MessageContainer.MessageType.Restart:
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195 | DoStartSlave();
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196 | break;
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197 | case MessageContainer.MessageType.Sleep:
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198 | Sleep();
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199 | break;
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200 | case MessageContainer.MessageType.SayHello:
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201 | wcfService.Connect(ConfigManager.Instance.GetClientInfo());
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202 | break;
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203 | }
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204 | } else {
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205 | ClientCom.LogMessage("Unknown MessageContainer: " + container);
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206 | }
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207 | }
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208 |
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209 | private void DoPauseJob(Guid jobId) {
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210 | Job job = Jobs[jobId];
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211 |
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212 | if (job != null) {
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213 | engines[job.Id].Pause();
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214 | JobData sJob = engines[job.Id].GetPausedJob();
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215 | // job.Exception = engines[job.Id].CurrentException; // can there be an exception if a job is paused
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216 | job.ExecutionTime = engines[job.Id].ExecutionTime;
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217 |
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218 | try {
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219 | ClientCom.LogMessage("Sending the paused job with id: " + job.Id);
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220 | wcfService.UpdateJobData(job, sJob, ConfigManager.Instance.GetClientInfo().Id, JobState.Paused);
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221 | SlaveStatusInfo.JobsProcessed++; //TODO: count or not count, thats the question
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222 | }
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223 | catch (Exception e) {
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224 | ClientCom.LogMessage("Transmitting to server failed. Storing the paused job with id: " + job.Id + " to hdd (" + e.ToString() + ")");
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225 | }
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226 | finally {
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227 | KillAppDomain(job.Id); // kill app-domain in every case
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228 | }
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229 | }
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230 | }
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231 |
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232 | private void DoStopJob(Guid guid) {
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233 | Job job = Jobs[guid];
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234 |
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235 | if (job != null) {
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236 | engines[job.Id].Stop();
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237 | JobData sJob = engines[job.Id].GetFinishedJob();
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238 | // job.Exception = engines[job.Id].CurrentException; // can there be an exception if a job is stopped regularly
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239 | job.ExecutionTime = engines[job.Id].ExecutionTime;
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240 |
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241 | try {
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242 | ClientCom.LogMessage("Sending the stoppped job with id: " + job.Id);
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243 | wcfService.UpdateJobData(job, sJob, ConfigManager.Instance.GetClientInfo().Id, JobState.Paused);
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244 | SlaveStatusInfo.JobsProcessed++; //TODO: count or not count, thats the question
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245 | }
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246 | catch (Exception e) {
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247 | ClientCom.LogMessage("Transmitting to server failed. Storing the paused job with id: " + job.Id + " to hdd (" + e.ToString() + ")");
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248 | }
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249 | finally {
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250 | KillAppDomain(job.Id); // kill app-domain in every case
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251 | }
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252 | }
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253 | }
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254 |
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255 | /// <summary>
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256 | /// aborts all running jobs, no results are sent back
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257 | /// </summary>
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258 | private void DoAbortAll() {
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259 | List<Guid> guids = new List<Guid>();
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260 | foreach (Guid job in Jobs.Keys) {
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261 | guids.Add(job);
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262 | }
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263 |
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264 | foreach (Guid g in guids) {
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265 | KillAppDomain(g);
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266 | }
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267 |
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268 | ClientCom.LogMessage("Aborted all jobs!");
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269 | }
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270 |
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271 | /// <summary>
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272 | /// wait for jobs to finish, then pause client
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273 | /// </summary>
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274 | private void DoPauseAll() {
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275 | ClientCom.LogMessage("Pause all received");
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276 |
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277 | //copy guids because there will be removed items from 'Jobs'
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278 | List<Guid> guids = new List<Guid>();
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279 | foreach (Guid job in Jobs.Keys) {
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280 | guids.Add(job);
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281 | }
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282 |
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283 | foreach (Guid g in guids) {
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284 | DoPauseJob(g);
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285 | }
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286 | }
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287 |
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288 | /// <summary>
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289 | /// pause slave immediately
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290 | /// </summary>
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291 | private void DoStopAll() {
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292 | ClientCom.LogMessage("Stop all received");
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293 |
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294 | //copy guids because there will be removed items from 'Jobs'
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295 | List<Guid> guids = new List<Guid>();
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296 | foreach (Guid job in Jobs.Keys) {
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297 | guids.Add(job);
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298 | }
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299 |
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300 | foreach (Guid g in guids) {
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301 | DoStopJob(g);
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302 | }
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303 | }
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304 |
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305 | /// <summary>
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306 | /// completly shudown slave
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307 | /// </summary>
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308 | public void Shutdown() {
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309 | MessageContainer mc = new MessageContainer(MessageContainer.MessageType.ShutdownSlave);
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310 | MessageQueue.GetInstance().AddMessage(mc);
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311 | waitShutdownSem.WaitOne();
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312 | }
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313 |
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314 | /// <summary>
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315 | /// complete shutdown, should be called before the the application is exited
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316 | /// </summary>
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317 | private void ShutdownCore() {
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318 | ClientCom.LogMessage("Shutdown Signal received");
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319 | ClientCom.LogMessage("Stopping heartbeat");
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320 | heartbeatManager.StopHeartBeat();
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321 | abortRequested = true;
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322 | ClientCom.LogMessage("Logging out");
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323 |
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324 |
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325 | lock (engines) {
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326 | ClientCom.LogMessage("engines locked");
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327 | foreach (KeyValuePair<Guid, AppDomain> kvp in appDomains) {
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328 | ClientCom.LogMessage("Shutting down Appdomain for " + kvp.Key);
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329 | appDomains[kvp.Key].UnhandledException -= new UnhandledExceptionEventHandler(AppDomain_UnhandledException);
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330 | AppDomain.Unload(kvp.Value);
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331 | }
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332 | }
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333 | WcfService.Instance.Disconnect();
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334 | ClientCom.Shutdown();
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335 | SlaveClientCom.Close();
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336 |
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337 | if (slaveComm.State != CommunicationState.Closed)
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338 | slaveComm.Close();
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339 | }
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340 |
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341 | /// <summary>
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342 | /// reinitializes everything and continues operation,
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343 | /// can be called after Sleep()
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344 | /// </summary>
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345 | private void DoStartSlave() {
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346 | ClientCom.LogMessage("Restart received");
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347 | StartHeartbeats();
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348 | ClientCom.LogMessage("Restart done");
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349 | }
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350 |
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351 | /// <summary>
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352 | /// stop slave, except for client gui communication,
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353 | /// primarily used by gui if core is running as windows service
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354 | /// </summary>
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355 | //TODO: do we need an AbortSleep?
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356 | private void Sleep() {
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357 | ClientCom.LogMessage("Sleep received");
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358 | heartbeatManager.StopHeartBeat();
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359 | heartbeatManager = null;
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360 | DoStopAll();
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361 | WcfService.Instance.Disconnect();
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362 | ClientCom.LogMessage("Sleep done");
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363 | }
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364 |
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365 | /// <summary>
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366 | /// Pauses a job, which means sending it to the server and killing it locally;
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367 | /// atm only used when executor is waiting for child jobs
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368 | /// </summary>
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369 | /// <param name="data"></param>
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370 | [MethodImpl(MethodImplOptions.Synchronized)]
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371 | public void PauseWaitJob(JobData data) {
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372 | if (!Jobs.ContainsKey(data.JobId)) {
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373 | ClientCom.LogMessage("Can't find job with id " + data.JobId);
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374 | } else {
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375 | Job job = Jobs[data.JobId];
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376 | wcfService.UpdateJobData(job, data, ConfigManager.Instance.GetClientInfo().Id, JobState.Paused);
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377 | wcfService.UpdateJobState(job.Id, JobState.Waiting, null);
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378 | }
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379 | KillAppDomain(data.JobId);
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380 | }
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381 |
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382 | /// <summary>
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383 | /// 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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384 | /// once the connection gets reestablished, the job gets submitted
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385 | /// </summary>
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386 | /// <param name="jobId"></param>
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387 | [MethodImpl(MethodImplOptions.Synchronized)]
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388 | public void SendFinishedJob(Guid jobId) {
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389 | try {
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390 | ClientCom.LogMessage("Getting the finished job with id: " + jobId);
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391 | if (!engines.ContainsKey(jobId)) {
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392 | ClientCom.LogMessage("Engine doesn't exist");
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393 | return;
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394 | }
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395 | if (!jobs.ContainsKey(jobId)) {
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396 | ClientCom.LogMessage("Job doesn't exist");
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397 | return;
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398 | }
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399 | Job cJob = jobs[jobId];
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400 | cJob.ExecutionTime = engines[jobId].ExecutionTime;
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401 |
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402 | JobData sJob = engines[jobId].GetFinishedJob();
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403 | // cJob.Exception = engines[jId].CurrentException; // can there be an exception if the job is sent normally. the exception should be entered in the statelog with the corresponding state (Failed)
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404 | cJob.ExecutionTime = engines[jobId].ExecutionTime;
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405 |
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406 | try {
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407 | ClientCom.LogMessage("Sending the finished job with id: " + jobId);
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408 | wcfService.UpdateJobData(cJob, sJob, ConfigManager.Instance.GetClientInfo().Id, JobState.Finished);
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409 | SlaveStatusInfo.JobsProcessed++;
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410 | }
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411 | catch (Exception e) {
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412 | ClientCom.LogMessage("Transmitting to server failed. Storing the finished job with id: " + jobId + " to hdd (" + e.ToString() + ")");
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413 | }
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414 | finally {
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415 | KillAppDomain(jobId); // kill app-domain in every case
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416 | heartbeatManager.AwakeHeartBeatThread();
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417 | }
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418 | }
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419 | catch (Exception e) {
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420 | OnExceptionOccured(e);
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421 | }
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422 | }
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423 |
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424 | /// <summary>
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425 | /// A new Job from the wcfService has been received and will be started within a AppDomain.
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426 | /// </summary>
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427 | /// <param name="sender"></param>
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428 | /// <param name="e"></param>
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429 | private void StartJobInAppDomain(Job myJob, JobData jobData) {
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430 | ClientCom.LogMessage("Received new job with id " + myJob.Id);
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431 | String pluginDir = Path.Combine(PluginCache.Instance.PluginTempBaseDir, myJob.Id.ToString());
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432 | bool pluginsPrepared = false;
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433 | string configFileName = string.Empty;
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434 |
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435 | try {
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436 | PluginCache.Instance.PreparePlugins(myJob, out configFileName);
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437 | ClientCom.LogMessage("Plugins fetched for job " + myJob.Id);
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438 | pluginsPrepared = true;
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439 | }
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440 | catch (Exception exception) {
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441 | ClientCom.LogMessage(string.Format("Copying plugins for job {0} failed: {1}", myJob.Id, exception));
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442 | }
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443 |
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444 | if (pluginsPrepared) {
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445 | try {
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446 | AppDomain appDomain = HeuristicLab.PluginInfrastructure.Sandboxing.SandboxManager.CreateAndInitSandbox(myJob.Id.ToString(), pluginDir, Path.Combine(pluginDir, configFileName));
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447 | appDomain.UnhandledException += new UnhandledExceptionEventHandler(AppDomain_UnhandledException);
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448 | lock (engines) {
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449 | appDomains.Add(myJob.Id, appDomain);
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450 | ClientCom.LogMessage("Creating AppDomain");
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451 | Executor engine = (Executor)appDomain.CreateInstanceAndUnwrap(typeof(Executor).Assembly.GetName().Name, typeof(Executor).FullName);
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452 | ClientCom.LogMessage("Created AppDomain");
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453 | engine.JobId = myJob.Id;
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454 | engine.Core = this;
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455 | ClientCom.LogMessage("Starting Engine for job " + myJob.Id);
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456 | engines.Add(myJob.Id, engine);
|
---|
457 | engine.Start(jobData.Data);
|
---|
458 | SlaveStatusInfo.JobsFetched++;
|
---|
459 | ClientCom.LogMessage("Increment FetchedJobs to:" + SlaveStatusInfo.JobsFetched);
|
---|
460 | }
|
---|
461 | }
|
---|
462 | catch (Exception exception) {
|
---|
463 | ClientCom.LogMessage("Creating the Appdomain and loading the job failed for job " + myJob.Id);
|
---|
464 | ClientCom.LogMessage("Error thrown is: " + exception.ToString());
|
---|
465 | KillAppDomain(myJob.Id);
|
---|
466 | }
|
---|
467 | }
|
---|
468 | heartbeatManager.AwakeHeartBeatThread();
|
---|
469 | }
|
---|
470 |
|
---|
471 | public event EventHandler<EventArgs<Exception>> ExceptionOccured;
|
---|
472 | private void OnExceptionOccured(Exception e) {
|
---|
473 | ClientCom.LogMessage("Error: " + e.ToString());
|
---|
474 | var handler = ExceptionOccured;
|
---|
475 | if (handler != null) handler(this, new EventArgs<Exception>(e));
|
---|
476 | }
|
---|
477 |
|
---|
478 | private void AppDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e) {
|
---|
479 | ClientCom.LogMessage("Exception in AppDomain: " + e.ExceptionObject.ToString());
|
---|
480 | KillAppDomain(new Guid(e.ExceptionObject.ToString()));
|
---|
481 | }
|
---|
482 |
|
---|
483 | /// <summary>
|
---|
484 | /// Enqueues messages from the executor to the message queue.
|
---|
485 | /// This is necessary if the core thread has to execute certain actions, e.g.
|
---|
486 | /// killing of an app domain.
|
---|
487 | /// </summary>
|
---|
488 | /// <typeparam name="T"></typeparam>
|
---|
489 | /// <param name="action"></param>
|
---|
490 | /// <param name="parameter"></param>
|
---|
491 | /// <returns>true if the calling method can continue execution, else false</returns>
|
---|
492 | public void EnqueueExecutorMessage<T>(Action<T> action, T parameter) {
|
---|
493 | ExecutorMessageContainer<T> container = new ExecutorMessageContainer<T>();
|
---|
494 | container.Callback = action;
|
---|
495 | container.CallbackParameter = parameter;
|
---|
496 | MessageQueue.GetInstance().AddMessage(container);
|
---|
497 | }
|
---|
498 |
|
---|
499 | /// <summary>
|
---|
500 | /// Kill a appdomain with a specific id.
|
---|
501 | /// </summary>
|
---|
502 | /// <param name="id">the GUID of the job</param>
|
---|
503 | //[MethodImpl(MethodImplOptions.Synchronized)]
|
---|
504 | public void KillAppDomain(Guid id) {
|
---|
505 | if (Thread.CurrentThread.ManagedThreadId != this.coreThreadId) {
|
---|
506 | EnqueueExecutorMessage<Guid>(KillAppDomain, id);
|
---|
507 | return;
|
---|
508 | }
|
---|
509 |
|
---|
510 | ClientCom.LogMessage("Shutting down Appdomain for Job " + id);
|
---|
511 | lock (engines) {
|
---|
512 | try {
|
---|
513 | if (engines.ContainsKey(id)) {
|
---|
514 | engines[id].Dispose();
|
---|
515 | engines.Remove(id);
|
---|
516 | }
|
---|
517 |
|
---|
518 | if (appDomains.ContainsKey(id)) {
|
---|
519 | appDomains[id].UnhandledException -= new UnhandledExceptionEventHandler(AppDomain_UnhandledException);
|
---|
520 |
|
---|
521 | int repeat = 5;
|
---|
522 | while (repeat > 0) {
|
---|
523 | try {
|
---|
524 | AppDomain.Unload(appDomains[id]);
|
---|
525 | repeat = 0;
|
---|
526 | }
|
---|
527 | catch (CannotUnloadAppDomainException) {
|
---|
528 | ClientCom.LogMessage("Could not unload AppDomain, will try again in 1 sec.");
|
---|
529 | Thread.Sleep(1000);
|
---|
530 | repeat--;
|
---|
531 | if (repeat == 0) {
|
---|
532 | throw; // rethrow and let app crash
|
---|
533 | }
|
---|
534 | }
|
---|
535 | }
|
---|
536 | appDomains.Remove(id);
|
---|
537 | }
|
---|
538 |
|
---|
539 | jobs.Remove(id);
|
---|
540 | PluginCache.Instance.DeletePluginsForJob(id);
|
---|
541 | GC.Collect();
|
---|
542 | }
|
---|
543 | catch (Exception ex) {
|
---|
544 | ClientCom.LogMessage("Exception when unloading the appdomain: " + ex.ToString());
|
---|
545 | }
|
---|
546 | }
|
---|
547 | GC.Collect();
|
---|
548 | }
|
---|
549 | }
|
---|
550 | }
|
---|