Mercurial > hg > orthanc-stone

annotate Framework/Deprecated/Toolbox/BaseWebService.cpp @ 872:733c6db3e5a3 am-dev

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limiting the size of the cache
author Alain Mazy <alain@mazy.be>
date Mon, 01 Jul 2019 13:36:51 +0200
parents c0fcb2757b0a
children 200b4e0dddfc
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1 /**
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2 * Stone of Orthanc
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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) 2017-2018 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 Affero 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 * Affero 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 Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "BaseWebService.h"
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23
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24 #include "../../Messages/IObservable.h"
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25 #include "../../../Platforms/Generic/IOracleCommand.h"
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26
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27 #include <Core/OrthancException.h>
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28
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29 #include <boost/shared_ptr.hpp>
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30 #include <algorithm>
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31
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32 namespace Deprecated
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33 {
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34
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35
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36 class BaseWebService::BaseWebServicePayload : public Orthanc::IDynamicObject
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37 {
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38 private:
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39 std::auto_ptr< OrthancStone::MessageHandler<IWebService::HttpRequestSuccessMessage> > userSuccessHandler_;
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40 std::auto_ptr< OrthancStone::MessageHandler<IWebService::HttpRequestErrorMessage> > userFailureHandler_;
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41 std::auto_ptr< Orthanc::IDynamicObject> userPayload_;
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42
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43 public:
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44 BaseWebServicePayload(OrthancStone::MessageHandler<IWebService::HttpRequestSuccessMessage>* userSuccessHandler,
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45 OrthancStone::MessageHandler<IWebService::HttpRequestErrorMessage>* userFailureHandler,
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46 Orthanc::IDynamicObject* userPayload) :
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47 userSuccessHandler_(userSuccessHandler),
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48 userFailureHandler_(userFailureHandler),
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49 userPayload_(userPayload)
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50 {
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51 }
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52
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53 void HandleSuccess(const IWebService::HttpRequestSuccessMessage& message) const
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54 {
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55 if (userSuccessHandler_.get() != NULL)
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56 {
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57 // recreate a success message with the user payload
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58 IWebService::HttpRequestSuccessMessage successMessage(message.GetUri(),
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59 message.GetAnswer(),
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60 message.GetAnswerSize(),
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61 message.GetAnswerHttpHeaders(),
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62 userPayload_.get());
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63 userSuccessHandler_->Apply(successMessage);
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64 }
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65 else
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66 {
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67 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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68 }
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69 }
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70
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71 void HandleFailure(const IWebService::HttpRequestErrorMessage& message) const
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72 {
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73 if (userFailureHandler_.get() != NULL)
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74 {
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75 // recreate a failure message with the user payload
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76 IWebService::HttpRequestErrorMessage failureMessage(message.GetUri(),
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77 userPayload_.get());
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78
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79 userFailureHandler_->Apply(failureMessage);
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80 }
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81 }
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82
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83 };
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84
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85
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86 void BaseWebService::GetAsync(const std::string& uri,
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87 const HttpHeaders& headers,
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88 Orthanc::IDynamicObject* payload /* takes ownership */,
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89 OrthancStone::MessageHandler<IWebService::HttpRequestSuccessMessage>* successCallback,
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90 OrthancStone::MessageHandler<IWebService::HttpRequestErrorMessage>* failureCallback,
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91 unsigned int timeoutInSeconds)
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92 {
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93 if (cache_.find(uri) == cache_.end())
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94 {
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95 GetAsyncInternal(uri, headers,
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96 new BaseWebService::BaseWebServicePayload(successCallback, failureCallback, payload), // ownership is transfered
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97 new OrthancStone::Callable<BaseWebService, IWebService::HttpRequestSuccessMessage>
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98 (*this, &BaseWebService::CacheAndNotifyHttpSuccess),
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99 new OrthancStone::Callable<BaseWebService, IWebService::HttpRequestErrorMessage>
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100 (*this, &BaseWebService::NotifyHttpError),
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101 timeoutInSeconds);
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102 }
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103 else
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104 {
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105 // put the uri on top of the most recently accessed list
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106 std::deque<std::string>::iterator it = std::find(orderedCacheKeys_.begin(), orderedCacheKeys_.end(), uri);
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107 if (it != orderedCacheKeys_.end())
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108 {
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109 std::string uri = *it;
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110 orderedCacheKeys_.erase(it);
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111 orderedCacheKeys_.push_front(uri);
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112 }
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113
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114 // create a command and "post" it to the Oracle so it is executed and commited "later"
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115 NotifyHttpSuccessLater(cache_[uri], payload, successCallback);
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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
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121
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122 void BaseWebService::NotifyHttpSuccess(const IWebService::HttpRequestSuccessMessage& message)
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123 {
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124 if (message.HasPayload())
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125 {
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126 dynamic_cast<const BaseWebServicePayload&>(message.GetPayload()).HandleSuccess(message);
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127 }
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128 else
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129 {
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130 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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131 }
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132 }
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133
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134 void BaseWebService::CacheAndNotifyHttpSuccess(const IWebService::HttpRequestSuccessMessage& message)
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135 {
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136 while (cacheCurrentSize_ + message.GetAnswerSize() > cacheMaxSize_ && orderedCacheKeys_.size() > 0)
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137 {
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138 const std::string& oldestUri = orderedCacheKeys_.back();
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139 HttpCache::iterator it = cache_.find(oldestUri);
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140 if (it != cache_.end())
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141 {
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142 cacheCurrentSize_ -= it->second->GetAnswerSize();
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143 cache_.erase(it);
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144 }
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145 orderedCacheKeys_.pop_back();
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146
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147 }
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148
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149 cache_[message.GetUri()] = boost::shared_ptr<CachedHttpRequestSuccessMessage>(new CachedHttpRequestSuccessMessage(message));
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150 orderedCacheKeys_.push_front(message.GetUri());
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151 cacheCurrentSize_ += message.GetAnswerSize();
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152
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153 NotifyHttpSuccess(message);
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154 }
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155
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156 void BaseWebService::NotifyHttpError(const IWebService::HttpRequestErrorMessage& message)
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157 {
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158 if (message.HasPayload())
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159 {
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160 dynamic_cast<const BaseWebServicePayload&>(message.GetPayload()).HandleFailure(message);
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161 }
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162 else
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163 {
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164 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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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
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171 }