Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/object_cache.h @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: object_cache.h
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3 // Description: A string indexed object cache.
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4 // Author: David Eger
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5 //
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6 // (C) Copyright 2012, Google Inc.
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7 // Licensed under the Apache License, Version 2.0 (the "License");
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8 // you may not use this file except in compliance with the License.
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9 // You may obtain a copy of the License at
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10 // http://www.apache.org/licenses/LICENSE-2.0
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11 // Unless required by applicable law or agreed to in writing, software
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12 // distributed under the License is distributed on an "AS IS" BASIS,
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13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 // See the License for the specific language governing permissions and
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15 // limitations under the License.
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16 //
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17 ///////////////////////////////////////////////////////////////////////
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18
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19 #ifndef TESSERACT_CCUTIL_OBJECT_CACHE_H_
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20 #define TESSERACT_CCUTIL_OBJECT_CACHE_H_
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21
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22 #include <functional> // for std::function
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23 #include <mutex> // for std::mutex
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24 #include <string>
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25 #include <vector> // for std::vector
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26 #include "ccutil.h"
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27 #include "errcode.h"
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28
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29 namespace tesseract {
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30
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31 // A simple object cache which maps a string to an object of type T.
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32 // Usually, these are expensive objects that are loaded from disk.
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33 // Reference counting is performed, so every Get() needs to be followed later
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34 // by a Free(). Actual deletion is accomplished by DeleteUnusedObjects().
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35 template <typename T>
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36 class ObjectCache {
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37 public:
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38 ObjectCache() = default;
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39 ~ObjectCache() {
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40 std::lock_guard<std::mutex> guard(mu_);
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41 for (auto &it : cache_) {
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42 if (it.count > 0) {
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43 tprintf(
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44 "ObjectCache(%p)::~ObjectCache(): WARNING! LEAK! object %p "
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45 "still has count %d (id %s)\n",
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46 static_cast<void *>(this), static_cast<void *>(it.object),
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47 it.count, it.id.c_str());
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48 } else {
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49 delete it.object;
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50 it.object = nullptr;
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51 }
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52 }
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53 }
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54
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55 // Return a pointer to the object identified by id.
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56 // If we haven't yet loaded the object, use loader to load it.
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57 // If loader fails to load it, record a nullptr entry in the cache
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58 // and return nullptr -- further attempts to load will fail (even
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59 // with a different loader) until DeleteUnusedObjects() is called.
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60 // We delete the given loader.
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61 T *Get(const std::string &id, std::function<T *()> loader) {
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62 T *retval = nullptr;
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63 std::lock_guard<std::mutex> guard(mu_);
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64 for (auto &it : cache_) {
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65 if (id == it.id) {
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66 retval = it.object;
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67 if (it.object != nullptr) {
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68 it.count++;
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69 }
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70 return retval;
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71 }
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72 }
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73 cache_.push_back(ReferenceCount());
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74 ReferenceCount &rc = cache_.back();
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75 rc.id = id;
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76 retval = rc.object = loader();
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77 rc.count = (retval != nullptr) ? 1 : 0;
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78 return retval;
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79 }
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80
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81 // Decrement the count for t.
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82 // Return whether we knew about the given pointer.
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83 bool Free(T *t) {
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84 if (t == nullptr) {
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85 return false;
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86 }
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87 std::lock_guard<std::mutex> guard(mu_);
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88 for (auto &it : cache_) {
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89 if (it.object == t) {
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90 --it.count;
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91 return true;
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92 }
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93 }
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94 return false;
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95 }
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96
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97 void DeleteUnusedObjects() {
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98 std::lock_guard<std::mutex> guard(mu_);
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99 cache_.erase(std::remove_if(cache_.begin(), cache_.end(),
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100 [](const ReferenceCount &it) {
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101 if (it.count <= 0) {
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102 delete it.object;
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103 return true;
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104 } else {
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105 return false;
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106 }
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107 }),
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108 cache_.end());
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109 }
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110
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111 private:
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112 struct ReferenceCount {
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113 std::string id; // A unique ID to identify the object (think path on disk)
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114 T *object; // A copy of the object in memory. Can be delete'd.
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115 int count; // A count of the number of active users of this object.
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116 };
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117
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118 std::mutex mu_;
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119 std::vector<ReferenceCount> cache_;
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120 };
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121
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122 } // namespace tesseract
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123
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124 #endif // TESSERACT_CCUTIL_OBJECT_CACHE_H_