Page Speed Optimization Libraries
1.4.26.1
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00001 /* 00002 * Copyright 2012 Google Inc. 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http:///www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 00018 00019 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_FINDER_H_ 00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_FINDER_H_ 00021 00022 #include "net/instaweb/util/public/basictypes.h" 00023 #include "net/instaweb/util/public/string.h" 00024 #include "net/instaweb/util/public/string_util.h" 00025 00026 namespace net_instaweb { 00027 00028 class CriticalImages; 00029 class PropertyCache; 00030 class PropertyPage; 00031 class PropertyValue; 00032 class RewriteDriver; 00033 class Statistics; 00034 class Variable; 00035 00044 struct CriticalImagesInfo { 00045 StringSet html_critical_images; 00046 StringSet css_critical_images; 00047 }; 00048 00049 00052 class CriticalImagesFinder { 00053 public: 00054 static const char kCriticalImagesValidCount[]; 00055 static const char kCriticalImagesExpiredCount[]; 00056 static const char kCriticalImagesNotFoundCount[]; 00057 static const char kCriticalImagesPropertyName[]; 00058 00059 explicit CriticalImagesFinder(Statistics* stats); 00060 virtual ~CriticalImagesFinder(); 00061 00062 static void InitStats(Statistics* statistics); 00063 00067 virtual bool IsMeaningful(const RewriteDriver* driver) const = 0; 00068 00074 virtual int PercentSeenForCritical() const { 00075 return kDefaultPercentSeenForCritial; 00076 } 00077 00081 virtual int NumSetsToKeep() const { 00082 return kDefaultNumSetsToKeep; 00083 } 00084 00089 virtual bool IsHtmlCriticalImage(const GoogleString& image_url, 00090 RewriteDriver* driver); 00091 00092 virtual bool IsCssCriticalImage(const GoogleString& image_url, 00093 RewriteDriver* driver); 00094 00097 const StringSet& GetHtmlCriticalImages(RewriteDriver* driver); 00098 const StringSet& GetCssCriticalImages(RewriteDriver* driver); 00099 00104 StringSet* mutable_html_critical_images(RewriteDriver* driver); 00105 StringSet* mutable_css_critical_images(RewriteDriver* driver); 00106 00108 virtual void ComputeCriticalImages(StringPiece url, 00109 RewriteDriver* driver) = 0; 00110 00113 virtual const char* GetCriticalImagesCohort() const = 0; 00114 00119 bool UpdateCriticalImagesCacheEntryFromDriver( 00120 RewriteDriver* driver, 00121 StringSet* critical_images_set, 00122 StringSet* css_critical_images_set); 00123 00130 bool UpdateCriticalImagesCacheEntry( 00131 PropertyPage* page, 00132 PropertyCache* page_property_cache, 00133 StringSet* critical_images_set, 00134 StringSet* css_critical_images_set); 00135 00136 protected: 00141 virtual void UpdateCriticalImagesSetInDriver(RewriteDriver* driver); 00142 00147 void ExtractCriticalImagesFromCache( 00148 RewriteDriver* driver, 00149 const PropertyValue* property_value, 00150 bool track_stats, 00151 CriticalImagesInfo* critical_images_info); 00152 00153 00154 private: 00157 static const int kDefaultPercentSeenForCritial = 100; 00158 static const int kDefaultNumSetsToKeep = 1; 00159 00160 Variable* critical_images_valid_count_; 00161 Variable* critical_images_expired_count_; 00162 Variable* critical_images_not_found_count_; 00163 00168 bool UpdateCriticalImages(const StringSet* html_critical_images, 00169 const StringSet* css_critical_images, 00170 CriticalImages* critical_images) const; 00171 00172 friend class CriticalImagesFinderTestBase; 00173 DISALLOW_COPY_AND_ASSIGN(CriticalImagesFinder); 00174 }; 00175 00176 } 00177 00178 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_FINDER_H_