annotate OrthancServer/Scheduler/ServerScheduler.cpp @ 995:8c67382f44a7 lua-scripting

limit number of jobs in the scheduler
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 03 Jul 2014 15:58:53 +0200
parents c9cdd53a6b31
children db18c071fbd7
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
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4 * Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "ServerScheduler.h"
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34
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35 #include "../../Core/OrthancException.h"
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36
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37 #include <glog/logging.h>
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38
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39 namespace Orthanc
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40 {
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41 namespace
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42 {
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43 // Anonymous namespace to avoid clashes between compilation modules
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44 class Sink : public IServerFilter
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45 {
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46 private:
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47 ListOfStrings& target_;
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48
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49 public:
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50 Sink(ListOfStrings& target) : target_(target)
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51 {
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52 }
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53
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54 virtual bool SendOutputsToSink() const
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55 {
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56 return false;
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57 }
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58
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59 virtual bool Apply(ListOfStrings& outputs,
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60 const ListOfStrings& inputs)
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61 {
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62 for (ListOfStrings::const_iterator
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63 it = inputs.begin(); it != inputs.end(); it++)
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64 {
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65 target_.push_back(*it);
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66 }
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67
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68 return true;
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69 }
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70 };
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71 }
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72
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73
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74 ServerScheduler::JobInfo& ServerScheduler::GetJobInfo(const std::string& jobId)
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75 {
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76 Jobs::iterator info = jobs_.find(jobId);
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77
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78 if (info == jobs_.end())
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79 {
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80 throw OrthancException(ErrorCode_InternalError);
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81 }
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82
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83 return info->second;
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84 }
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85
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86
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87 void ServerScheduler::SignalSuccess(const std::string& jobId)
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88 {
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89 boost::mutex::scoped_lock lock(mutex_);
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90
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91 JobInfo& info = GetJobInfo(jobId);
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92 info.success_++;
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93
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94 assert(info.failures_ == 0);
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95
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96 if (info.success_ >= info.size_)
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97 {
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98 if (info.watched_)
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99 {
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100 watchedJobStatus_[jobId] = JobStatus_Success;
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101 watchedJobFinished_.notify_all();
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102 }
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103
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104 LOG(INFO) << "Job successfully finished (" << info.description_ << ")";
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105 jobs_.erase(jobId);
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106
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107 availableJob_.Release();
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108 }
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109 }
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110
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111
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112 void ServerScheduler::SignalFailure(const std::string& jobId)
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113 {
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114 boost::mutex::scoped_lock lock(mutex_);
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115
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116 JobInfo& info = GetJobInfo(jobId);
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117 info.failures_++;
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118
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119 if (info.success_ + info.failures_ >= info.size_)
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120 {
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121 if (info.watched_)
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122 {
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123 watchedJobStatus_[jobId] = JobStatus_Failure;
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124 watchedJobFinished_.notify_all();
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125 }
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126
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127 LOG(ERROR) << "Job has failed (" << info.description_ << ")";
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128 jobs_.erase(jobId);
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129
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130 availableJob_.Release();
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131 }
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132 }
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133
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134
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135 void ServerScheduler::Worker(ServerScheduler* that)
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136 {
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137 static const int32_t TIMEOUT = 100;
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138
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139 LOG(WARNING) << "The server scheduler has started";
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140
781
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141 while (!that->finish_)
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142 {
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143 std::auto_ptr<IDynamicObject> object(that->queue_.Dequeue(TIMEOUT));
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144 if (object.get() != NULL)
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145 {
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146 ServerFilterInstance& filter = dynamic_cast<ServerFilterInstance&>(*object);
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147
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148 // Skip the execution of this filter if its parent job has
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149 // previously failed.
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150 bool jobHasFailed;
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151 {
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152 boost::mutex::scoped_lock lock(that->mutex_);
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153 JobInfo& info = that->GetJobInfo(filter.GetJobId());
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154 jobHasFailed = (info.failures_ > 0 || info.cancel_);
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155 }
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156
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157 if (jobHasFailed)
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158 {
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159 that->SignalFailure(filter.GetJobId());
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160 }
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161 else
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162 {
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163 filter.Execute(*that);
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164 }
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165 }
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166 }
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167 }
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168
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169
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170 void ServerScheduler::SubmitInternal(ServerJob& job,
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171 bool watched)
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172 {
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173 availableJob_.Acquire();
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174
781
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175 boost::mutex::scoped_lock lock(mutex_);
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176
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177 JobInfo info;
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178 info.size_ = job.Submit(queue_, *this);
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179 info.cancel_ = false;
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180 info.success_ = 0;
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181 info.failures_ = 0;
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182 info.description_ = job.GetDescription();
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183 info.watched_ = watched;
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184
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185 assert(info.size_ > 0);
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186
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187 if (watched)
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188 {
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189 watchedJobStatus_[job.GetId()] = JobStatus_Running;
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190 }
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191
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192 jobs_[job.GetId()] = info;
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193
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194 LOG(INFO) << "New job submitted (" << job.description_ << ")";
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195 }
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196
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197
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198 ServerScheduler::ServerScheduler(unsigned int maxJobs) : availableJob_(maxJobs)
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199 {
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200 finish_ = false;
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201 worker_ = boost::thread(Worker, this);
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202 }
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203
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204
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205 ServerScheduler::~ServerScheduler()
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206 {
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207 finish_ = true;
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208 worker_.join();
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209 }
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210
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211
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212 void ServerScheduler::Submit(ServerJob& job)
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213 {
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214 if (job.filters_.empty())
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215 {
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216 return;
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217 }
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218
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219 SubmitInternal(job, false);
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220 }
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221
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222
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223 bool ServerScheduler::SubmitAndWait(ListOfStrings& outputs,
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224 ServerJob& job)
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225 {
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226 std::string jobId = job.GetId();
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227
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228 outputs.clear();
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229
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230 if (job.filters_.empty())
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231 {
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232 return true;
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233 }
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234
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235 // Add a sink filter to collect all the results of the filters
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236 // that have no next filter.
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237 ServerFilterInstance& sink = job.AddFilter(new Sink(outputs));
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238
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239 for (std::list<ServerFilterInstance*>::iterator
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240 it = job.filters_.begin(); it != job.filters_.end(); it++)
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241 {
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242 if ((*it) != &sink &&
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243 (*it)->GetNextFilters().size() == 0 &&
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244 (*it)->GetFilter().SendOutputsToSink())
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245 {
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246 (*it)->ConnectNext(sink);
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247 }
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248 }
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249
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250 // Submit the job
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251 SubmitInternal(job, true);
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252
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253 // Wait for the job to complete (either success or failure)
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254 JobStatus status;
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255
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256 {
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257 boost::mutex::scoped_lock lock(mutex_);
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258
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259 assert(watchedJobStatus_.find(jobId) != watchedJobStatus_.end());
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260
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261 while (watchedJobStatus_[jobId] == JobStatus_Running)
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262 {
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263 watchedJobFinished_.wait(lock);
781
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264 }
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265
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266 status = watchedJobStatus_[jobId];
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267 watchedJobStatus_.erase(jobId);
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268 }
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269
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270 return (status == JobStatus_Success);
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271 }
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272
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273
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274 bool ServerScheduler::IsRunning(const std::string& jobId)
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275 {
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276 boost::mutex::scoped_lock lock(mutex_);
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277 return jobs_.find(jobId) != jobs_.end();
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278 }
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279
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280
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281 void ServerScheduler::Cancel(const std::string& jobId)
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282 {
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283 boost::mutex::scoped_lock lock(mutex_);
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284
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285 Jobs::iterator job = jobs_.find(jobId);
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286
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287 if (job != jobs_.end())
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288 {
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289 job->second.cancel_ = true;
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290 LOG(WARNING) << "Canceling a job (" << job->second.description_ << ")";
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291 }
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292 }
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293
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294
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295 float ServerScheduler::GetProgress(const std::string& jobId)
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296 {
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297 boost::mutex::scoped_lock lock(mutex_);
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298
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299 Jobs::iterator job = jobs_.find(jobId);
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300
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301 if (job == jobs_.end() ||
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302 job->second.size_ == 0 /* should never happen */)
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303 {
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304 // This job is not running
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305 return 1;
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306 }
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307
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308 if (job->second.failures_ != 0)
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309 {
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310 return 1;
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311 }
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312
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313 if (job->second.size_ == 1)
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314 {
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315 return job->second.success_;
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316 }
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317
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318 return (static_cast<float>(job->second.success_) /
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319 static_cast<float>(job->second.size_ - 1));
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320 }
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321
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322
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323 void ServerScheduler::GetListOfJobs(ListOfStrings& jobs)
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324 {
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325 boost::mutex::scoped_lock lock(mutex_);
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326
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327 jobs.clear();
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328
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329 for (Jobs::const_iterator
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330 it = jobs_.begin(); it != jobs_.end(); it++)
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331 {
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332 jobs.push_back(it->first);
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333 }
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334 }
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335 }