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annotate Core/Cache/MemoryStringCache.h @ 3590:d5740d3b1d67

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fix for issue #156: Chunked Dicom-web transfer uses 100% CPU
author Alain Mazy <alain@mazy.be>
date Mon, 23 Dec 2019 10:42:59 +0100
parents 4d809b2e1141
children 94f4a18a79cc
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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) 2017-2019 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 General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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32
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33
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34 #pragma once
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35
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36 #include "MemoryObjectCache.h"
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37
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38 namespace Orthanc
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39 {
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40 /**
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41 * Facade object around "MemoryObjectCache" that caches a dictionary
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42 * of strings, using the "fetch/add" paradigm of memcached.
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43 **/
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44 class MemoryStringCache : public boost::noncopyable
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45 {
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46 private:
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47 class StringValue;
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48
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49 MemoryObjectCache cache_;
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50
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51 public:
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52 size_t GetMaximumSize()
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53 {
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54 return cache_.GetMaximumSize();
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55 }
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56
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57 void SetMaximumSize(size_t size)
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58 {
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59 cache_.SetMaximumSize(size);
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60 }
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61
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62 void Add(const std::string& key,
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63 const std::string& value);
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64
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65 void Invalidate(const std::string& key)
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66 {
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67 cache_.Invalidate(key);
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68 }
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69
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70 bool Fetch(std::string& value,
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71 const std::string& key);
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72 };
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73 }