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annotate OrthancFramework/Sources/JobsEngine/JobsRegistry.h @ 4181:b416b6bf129b

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clarification of sdk doc about deadlocks
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 08 Sep 2020 09:16:33 +0200
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children 2007ab69ac16
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser 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 Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #pragma once
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24
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25 #if !defined(ORTHANC_SANDBOXED)
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26 # error The macro ORTHANC_SANDBOXED must be defined
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27 #endif
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28
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29 #if ORTHANC_SANDBOXED == 1
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30 # error The job engine cannot be used in sandboxed environments
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31 #endif
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32
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33 #include "JobInfo.h"
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34 #include "IJobUnserializer.h"
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35
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36 #include <list>
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37 #include <set>
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38 #include <queue>
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39 #include <boost/thread/mutex.hpp>
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40 #include <boost/thread/condition_variable.hpp>
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41
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42 namespace Orthanc
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43 {
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44 // This class handles the state machine of the jobs engine
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45 class ORTHANC_PUBLIC JobsRegistry : public boost::noncopyable
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46 {
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47 public:
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48 class ORTHANC_PUBLIC IObserver : public boost::noncopyable
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49 {
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50 public:
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51 virtual ~IObserver()
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52 {
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53 }
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54
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55 virtual void SignalJobSubmitted(const std::string& jobId) = 0;
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56
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57 virtual void SignalJobSuccess(const std::string& jobId) = 0;
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58
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59 virtual void SignalJobFailure(const std::string& jobId) = 0;
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60 };
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61
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62 private:
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63 enum CompletedReason
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64 {
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65 CompletedReason_Success,
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66 CompletedReason_Failure,
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67 CompletedReason_Canceled
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68 };
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69
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70 class JobHandler;
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71
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72 struct PriorityComparator
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73 {
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74 bool operator() (JobHandler*& a,
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75 JobHandler*& b) const;
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76 };
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77
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78 typedef std::map<std::string, JobHandler*> JobsIndex;
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79 typedef std::list<JobHandler*> CompletedJobs;
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80 typedef std::set<JobHandler*> RetryJobs;
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81 typedef std::priority_queue<JobHandler*,
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82 std::vector<JobHandler*>, // Could be a "std::deque"
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83 PriorityComparator> PendingJobs;
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84
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85 boost::mutex mutex_;
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86 JobsIndex jobsIndex_;
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87 PendingJobs pendingJobs_;
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88 CompletedJobs completedJobs_;
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89 RetryJobs retryJobs_;
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90
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91 boost::condition_variable pendingJobAvailable_;
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92 boost::condition_variable someJobComplete_;
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93 size_t maxCompletedJobs_;
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94
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95 IObserver* observer_;
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96
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97
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98 #ifndef NDEBUG
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99 bool IsPendingJob(const JobHandler& job) const;
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100
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101 bool IsCompletedJob(JobHandler& job) const;
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102
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103 bool IsRetryJob(JobHandler& job) const;
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104 #endif
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105
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106 void CheckInvariants() const;
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107
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108 void ForgetOldCompletedJobs();
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109
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110 void SetCompletedJob(JobHandler& job,
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111 bool success);
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112
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113 void MarkRunningAsCompleted(JobHandler& job,
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114 CompletedReason reason);
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115
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116 void MarkRunningAsRetry(JobHandler& job,
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117 unsigned int timeout);
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118
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119 void MarkRunningAsPaused(JobHandler& job);
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120
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121 bool GetStateInternal(JobState& state,
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122 const std::string& id);
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123
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124 void RemovePendingJob(const std::string& id);
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125
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126 void RemoveRetryJob(JobHandler* handler);
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127
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128 void SubmitInternal(std::string& id,
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129 JobHandler* handler);
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130
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131 public:
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132 JobsRegistry(size_t maxCompletedJobs) :
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133 maxCompletedJobs_(maxCompletedJobs),
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134 observer_(NULL)
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135 {
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136 }
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137
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138 JobsRegistry(IJobUnserializer& unserializer,
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139 const Json::Value& s,
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140 size_t maxCompletedJobs);
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141
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142 ~JobsRegistry();
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143
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144 void SetMaxCompletedJobs(size_t i);
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145
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146 size_t GetMaxCompletedJobs();
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147
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148 void ListJobs(std::set<std::string>& target);
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149
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150 bool GetJobInfo(JobInfo& target,
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151 const std::string& id);
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152
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153 bool GetJobOutput(std::string& output,
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154 MimeType& mime,
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155 const std::string& job,
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156 const std::string& key);
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157
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158 void Serialize(Json::Value& target);
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159
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160 void Submit(std::string& id,
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161 IJob* job, // Takes ownership
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162 int priority);
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163
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164 void Submit(IJob* job, // Takes ownership
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165 int priority);
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166
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167 void SubmitAndWait(Json::Value& successContent,
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168 IJob* job, // Takes ownership
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169 int priority);
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170
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171 bool SetPriority(const std::string& id,
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172 int priority);
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173
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174 bool Pause(const std::string& id);
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175
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176 bool Resume(const std::string& id);
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177
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178 bool Resubmit(const std::string& id);
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179
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180 bool Cancel(const std::string& id);
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181
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182 void ScheduleRetries();
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183
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184 bool GetState(JobState& state,
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185 const std::string& id);
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186
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187 void SetObserver(IObserver& observer);
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188
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189 void ResetObserver();
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190
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191 void GetStatistics(unsigned int& pending,
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192 unsigned int& running,
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193 unsigned int& success,
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194 unsigned int& errors);
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195
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196 class ORTHANC_PUBLIC RunningJob : public boost::noncopyable
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197 {
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198 private:
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199 JobsRegistry& registry_;
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200 JobHandler* handler_; // Can only be accessed if the
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201 // registry mutex is locked!
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202 IJob* job_; // Will by design be in mutual exclusion,
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203 // because only one RunningJob can be
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204 // executed at a time on a JobHandler
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205
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206 std::string id_;
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207 int priority_;
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208 JobState targetState_;
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209 unsigned int targetRetryTimeout_;
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210 bool canceled_;
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211
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212 public:
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213 RunningJob(JobsRegistry& registry,
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214 unsigned int timeout);
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215
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216 ~RunningJob();
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217
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218 bool IsValid() const;
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219
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220 const std::string& GetId() const;
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221
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222 int GetPriority() const;
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223
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224 IJob& GetJob();
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225
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226 bool IsPauseScheduled();
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227
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228 bool IsCancelScheduled();
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229
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230 void MarkSuccess();
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231
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232 void MarkFailure();
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233
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234 void MarkPause();
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235
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236 void MarkCanceled();
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237
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238 void MarkRetry(unsigned int timeout);
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239
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240 void UpdateStatus(ErrorCode code,
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241 const std::string& details);
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242 };
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243 };
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244 }