1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2011 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.Threading;
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24 | using HeuristicLab.Common;
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25 | using HeuristicLab.Core;
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26 | using HeuristicLab.Hive;
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27 |
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28 | namespace HeuristicLab.Clients.Hive.SlaveCore {
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29 | /// <summary>
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30 | /// The executor runs in the appdomain and handles the execution of an Hive job.
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31 | /// </summary>
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32 | public class Executor : MarshalByRefObject, IDisposable {
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33 | public Guid JobId { get; set; }
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34 | private IJob Job { get; set; }
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35 | public int CoresNeeded { get; set; }
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36 | public int MemoryNeeded { get; set; }
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37 | private bool wasJobAborted = false;
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38 | private Semaphore pauseStopSem = new Semaphore(0, 1);
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39 | private Semaphore startJobSem = new Semaphore(0, 1);
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40 | //make pause or stop wait until start is finished
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41 | private Semaphore jobStartedSem = new Semaphore(0, 1);
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42 | private ExecutorQueue executorQueue;
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43 | public ExecutorQueue ExecutorCommandQueue {
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44 | get {
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45 | return executorQueue;
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46 | }
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47 | }
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48 | public bool IsStopping { get; set; }
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49 | public bool IsPausing { get; set; }
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50 | private DateTime CreationTime { get; set; }
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51 | private Exception currentException;
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52 | public String CurrentException {
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53 | get {
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54 | if (currentException != null) {
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55 | return currentException.ToString();
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56 | } else {
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57 | return string.Empty;
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58 | }
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59 | }
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60 | }
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61 |
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62 | private ExecutionState ExecutionState {
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63 | get {
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64 | return Job != null ? Job.ExecutionState : HeuristicLab.Core.ExecutionState.Stopped;
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65 | }
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66 | }
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67 |
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68 | public TimeSpan ExecutionTime {
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69 | get {
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70 | return Job != null ? Job.ExecutionTime : new TimeSpan(0, 0, 0);
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71 | }
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72 | }
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73 |
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74 | public Executor() {
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75 | IsStopping = false;
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76 | IsPausing = false;
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77 | executorQueue = new ExecutorQueue();
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78 | }
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79 |
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80 | public void Start(byte[] serializedJob) {
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81 | try {
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82 | CreationTime = DateTime.Now;
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83 | Job = PersistenceUtil.Deserialize<IJob>(serializedJob);
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84 |
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85 | RegisterJobEvents();
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86 |
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87 | Job.Start();
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88 | if (!jobStartedSem.WaitOne(TimeSpan.FromSeconds(15))) {
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89 | throw new TimeoutException("Timeout when starting the job. JobStarted event was not fired.");
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90 | }
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91 | jobStartedSem.Release();
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92 | }
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93 | catch (Exception e) {
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94 | this.currentException = e;
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95 | Job_JobFailed(this, new EventArgs<Exception>(e));
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96 | }
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97 | }
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98 |
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99 | public void Pause() {
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100 | IsPausing = true;
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101 | // wait until job is started. if this does not happen, the Job is null an we give up
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102 | jobStartedSem.WaitOne(TimeSpan.FromSeconds(15));
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103 | if (Job == null) {
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104 | currentException = new Exception("Pausing job " + this.JobId + ": Job is null");
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105 | return;
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106 | }
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107 |
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108 | if (Job.ExecutionState == ExecutionState.Started) {
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109 | try {
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110 | Job.Pause();
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111 | //we need to block the pause...
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112 | pauseStopSem.WaitOne();
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113 | }
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114 | catch (Exception ex) {
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115 | currentException = new Exception("Error pausing job " + this.JobId + ": " + ex.ToString());
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116 | }
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117 | }
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118 | }
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119 |
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120 | public void Stop() {
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121 | IsStopping = true;
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122 | // wait until job is started. if this does not happen, the Job is null an we give up
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123 | jobStartedSem.WaitOne(TimeSpan.FromSeconds(15));
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124 | if (Job == null) {
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125 | currentException = new Exception("Stopping job " + this.JobId + ": Job is null");
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126 | }
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127 | wasJobAborted = true;
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128 |
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129 | if ((ExecutionState == ExecutionState.Started) || (ExecutionState == ExecutionState.Paused)) {
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130 | try {
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131 | Job.Stop();
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132 | pauseStopSem.WaitOne();
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133 | }
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134 | catch (Exception ex) {
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135 | currentException = new Exception("Error stopping job " + this.JobId + ": " + ex.ToString());
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136 | }
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137 | }
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138 | }
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139 |
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140 | private void RegisterJobEvents() {
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141 | Job.JobStopped += new EventHandler(Job_JobStopped);
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142 | Job.JobFailed += new EventHandler(Job_JobFailed);
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143 | Job.JobPaused += new EventHandler(Job_JobPaused);
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144 | Job.JobStarted += new EventHandler(Job_JobStarted);
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145 | }
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146 |
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147 | private void DeregisterJobEvents() {
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148 | Job.JobStopped -= new EventHandler(Job_JobStopped);
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149 | Job.JobFailed -= new EventHandler(Job_JobFailed);
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150 | Job.JobPaused -= new EventHandler(Job_JobPaused);
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151 | Job.JobStarted -= new EventHandler(Job_JobStarted);
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152 | }
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153 |
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154 | #region Job Events
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155 | private void Job_JobFailed(object sender, EventArgs e) {
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156 | EventArgs<Exception> ex = (EventArgs<Exception>)e;
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157 | currentException = ex.Value;
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158 |
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159 | executorQueue.AddMessage(ExecutorMessageType.JobFailed);
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160 | }
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161 |
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162 | private void Job_JobStopped(object sender, EventArgs e) {
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163 | if (wasJobAborted)
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164 | pauseStopSem.Release();
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165 |
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166 | executorQueue.AddMessage(ExecutorMessageType.JobStopped);
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167 | }
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168 |
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169 | private void Job_JobPaused(object sender, EventArgs e) {
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170 | pauseStopSem.Release();
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171 | executorQueue.AddMessage(ExecutorMessageType.JobPaused);
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172 | }
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173 |
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174 | private void Job_JobStarted(object sender, EventArgs e) {
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175 | jobStartedSem.Release();
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176 | executorQueue.AddMessage(ExecutorMessageType.JobStarted);
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177 | }
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178 | #endregion
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179 |
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180 | public JobData GetJobData() {
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181 | if (Job.ExecutionState == ExecutionState.Started) {
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182 | throw new InvalidStateException("Job is still running");
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183 | } else {
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184 | JobData jobData = new JobData();
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185 | if (Job == null) {
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186 | //send empty job and save exception
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187 | jobData.Data = PersistenceUtil.Serialize(new JobData());
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188 | if (currentException == null) {
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189 | currentException = new Exception("Job with id " + this.JobId + " is null, sending empty job");
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190 | }
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191 | } else {
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192 | jobData.Data = PersistenceUtil.Serialize(Job);
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193 | }
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194 | jobData.JobId = JobId;
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195 | return jobData;
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196 | }
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197 | }
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198 |
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199 | public void Dispose() {
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200 | if (Job != null)
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201 | DeregisterJobEvents();
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202 | Job = null;
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203 | }
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204 | }
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205 | }
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