Page Speed Optimization Libraries
1.6.29.3
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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/property_cache.h" 00024 #include "net/instaweb/util/public/string.h" 00025 #include "net/instaweb/util/public/string_util.h" 00026 00027 namespace net_instaweb { 00028 00029 class CriticalImages; 00030 class RenderedImages; 00031 class RewriteDriver; 00032 class Statistics; 00033 class Variable; 00034 00035 00044 struct CriticalImagesInfo { 00045 CriticalImagesInfo() 00046 : is_critical_image_info_present(false), 00047 is_set_from_split_html(false) {} 00048 StringSet html_critical_images; 00049 StringSet css_critical_images; 00050 bool is_critical_image_info_present; 00051 bool is_set_from_split_html; 00052 }; 00053 00054 00057 class CriticalImagesFinder { 00058 public: 00059 static const char kCriticalImagesValidCount[]; 00060 static const char kCriticalImagesExpiredCount[]; 00061 static const char kCriticalImagesNotFoundCount[]; 00062 static const char kCriticalImagesPropertyName[]; 00065 static const char kRenderedImageDimensionsProperty[]; 00066 00067 explicit CriticalImagesFinder(Statistics* stats); 00068 virtual ~CriticalImagesFinder(); 00069 00070 static void InitStats(Statistics* statistics); 00071 00075 virtual bool IsMeaningful(const RewriteDriver* driver) const = 0; 00076 00082 virtual int PercentSeenForCritical() const { 00083 return kDefaultPercentSeenForCritial; 00084 } 00085 00089 virtual int NumSetsToKeep() const { 00090 return kDefaultNumSetsToKeep; 00091 } 00092 00098 bool IsHtmlCriticalImage(const GoogleString& image_url, 00099 RewriteDriver* driver); 00100 00101 bool IsCssCriticalImage(const GoogleString& image_url, 00102 RewriteDriver* driver); 00103 00106 const StringSet& GetHtmlCriticalImages(RewriteDriver* driver); 00107 const StringSet& GetCssCriticalImages(RewriteDriver* driver); 00108 00115 StringSet* mutable_html_critical_images(RewriteDriver* driver); 00116 StringSet* mutable_css_critical_images(RewriteDriver* driver); 00117 00119 virtual void ComputeCriticalImages(RewriteDriver* driver) = 0; 00120 00123 virtual const PropertyCache::Cohort* GetCriticalImagesCohort() const = 0; 00124 00130 bool UpdateCriticalImagesCacheEntryFromDriver( 00131 const StringSet* html_critical_images_set, 00132 const StringSet* css_critical_images_set, 00133 RewriteDriver* driver); 00134 00138 static bool UpdateCriticalImagesCacheEntry( 00139 const StringSet* html_critical_images_set, 00140 const StringSet* css_critical_images_set, 00141 int num_sets_to_keep, 00142 int percent_seen_for_critical, 00143 const PropertyCache::Cohort* cohort, 00144 AbstractPropertyPage* page); 00145 00148 virtual bool IsCriticalImageInfoPresent(RewriteDriver* driver); 00149 00151 virtual RenderedImages* ExtractRenderedImageDimensionsFromCache( 00152 RewriteDriver* driver); 00153 00155 void AddHtmlCriticalImage(const GoogleString& url, 00156 RewriteDriver* driver); 00157 00158 protected: 00163 virtual void UpdateCriticalImagesSetInDriver(RewriteDriver* driver); 00164 00165 virtual GoogleString GetKeyForUrl(const GoogleString& url) { 00166 return url; 00167 } 00168 00172 CriticalImagesInfo* ExtractCriticalImagesFromCache( 00173 RewriteDriver* driver, 00174 const PropertyValue* property_value); 00175 00176 private: 00177 friend class CriticalImagesFinderTestBase; 00178 00183 static bool UpdateCriticalImages(const StringSet* html_critical_images, 00184 const StringSet* css_critical_images, 00185 int num_sets_to_keep, 00186 int percent_seen_for_critical, 00187 CriticalImages* critical_images); 00188 00191 static const int kDefaultPercentSeenForCritial = 100; 00192 static const int kDefaultNumSetsToKeep = 1; 00193 00194 Variable* critical_images_valid_count_; 00195 Variable* critical_images_expired_count_; 00196 Variable* critical_images_not_found_count_; 00197 00198 DISALLOW_COPY_AND_ASSIGN(CriticalImagesFinder); 00199 }; 00200 00201 } 00202 00203 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_FINDER_H_