Page Speed Optimization Libraries
1.5.27.2
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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 AbstractPropertyPage; 00030 class PropertyCache; 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 00090 virtual bool IsHtmlCriticalImage(const GoogleString& image_url, 00091 RewriteDriver* driver); 00092 00093 virtual bool IsCssCriticalImage(const GoogleString& image_url, 00094 RewriteDriver* driver); 00095 00098 const StringSet& GetHtmlCriticalImages(RewriteDriver* driver); 00099 const StringSet& GetCssCriticalImages(RewriteDriver* driver); 00100 00107 StringSet* mutable_html_critical_images(RewriteDriver* driver); 00108 StringSet* mutable_css_critical_images(RewriteDriver* driver); 00109 00111 virtual void ComputeCriticalImages(StringPiece url, 00112 RewriteDriver* driver) = 0; 00113 00116 virtual const char* GetCriticalImagesCohort() const = 0; 00117 00123 bool UpdateCriticalImagesCacheEntryFromDriver( 00124 const StringSet* html_critical_images_set, 00125 const StringSet* css_critical_images_set, 00126 RewriteDriver* driver); 00127 00131 bool UpdateCriticalImagesCacheEntry( 00132 const StringSet* html_critical_images_set, 00133 const StringSet* css_critical_images_set, 00134 AbstractPropertyPage* page, 00135 PropertyCache* page_property_cache); 00136 00137 protected: 00142 virtual void UpdateCriticalImagesSetInDriver(RewriteDriver* driver); 00143 00147 CriticalImagesInfo* ExtractCriticalImagesFromCache( 00148 RewriteDriver* driver, 00149 const PropertyValue* property_value); 00150 00151 private: 00152 friend class CriticalImagesFinderTestBase; 00153 00158 bool UpdateCriticalImages(const StringSet* html_critical_images, 00159 const StringSet* css_critical_images, 00160 CriticalImages* critical_images) const; 00161 00164 static const int kDefaultPercentSeenForCritial = 100; 00165 static const int kDefaultNumSetsToKeep = 1; 00166 00167 Variable* critical_images_valid_count_; 00168 Variable* critical_images_expired_count_; 00169 Variable* critical_images_not_found_count_; 00170 00171 DISALLOW_COPY_AND_ASSIGN(CriticalImagesFinder); 00172 }; 00173 00174 } 00175 00176 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_FINDER_H_