Page Speed Optimization Libraries
1.7.30.1
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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 */ 00017 00018 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_BEACON_CRITICAL_IMAGES_FINDER_H_ 00019 #define NET_INSTAWEB_REWRITER_PUBLIC_BEACON_CRITICAL_IMAGES_FINDER_H_ 00020 00021 #include "net/instaweb/rewriter/public/critical_finder_support_util.h" 00022 #include "net/instaweb/rewriter/public/critical_images_finder.h" 00023 #include "net/instaweb/util/public/property_cache.h" 00024 #include "net/instaweb/util/public/string.h" 00025 #include "pagespeed/kernel/base/string_util.h" 00026 00027 namespace net_instaweb { 00028 00029 class NonceGenerator; 00030 class RenderedImages; 00031 class RewriteDriver; 00032 class Statistics; 00033 class Timer; 00034 00037 class BeaconCriticalImagesFinder : public CriticalImagesFinder { 00038 public: 00040 BeaconCriticalImagesFinder( 00041 const PropertyCache::Cohort* cohort, 00042 NonceGenerator* nonce_generator, 00043 Statistics* stats); 00044 virtual ~BeaconCriticalImagesFinder(); 00045 00046 virtual bool IsMeaningful(const RewriteDriver* driver) const; 00047 00048 virtual int PercentSeenForCritical() const { 00049 return kBeaconPercentSeenForCritical; 00050 } 00051 00052 virtual int SupportInterval() const { 00053 return kBeaconImageSupportInterval; 00054 } 00055 00056 virtual void ComputeCriticalImages(RewriteDriver* driver) {} 00057 00060 static bool UpdateCriticalImagesCacheEntry( 00061 const StringSet* html_critical_images_set, 00062 const StringSet* css_critical_images_set, 00063 const RenderedImages* rendered_images_set, 00064 const StringPiece& nonce, 00065 const PropertyCache::Cohort* cohort, 00066 AbstractPropertyPage* page, 00067 Timer* timer); 00068 00072 virtual BeaconMetadata PrepareForBeaconInsertion(RewriteDriver* driver); 00073 00074 private: 00075 virtual GoogleString GetKeyForUrl(const GoogleString& url); 00076 00078 static const int kBeaconPercentSeenForCritical = 80; 00080 static const int kBeaconImageSupportInterval = 10; 00081 00082 NonceGenerator* nonce_generator_; 00083 }; 00084 00085 } 00086 00087 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_BEACON_CRITICAL_IMAGES_FINDER_H_