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 */ 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_images_finder.h" 00022 #include "net/instaweb/rewriter/public/rewrite_driver.h" 00023 #include "net/instaweb/rewriter/public/rewrite_driver_factory.h" 00024 #include "net/instaweb/rewriter/public/rewrite_options.h" 00025 #include "net/instaweb/rewriter/public/server_context.h" 00026 #include "net/instaweb/util/public/string.h" 00027 #include "net/instaweb/util/public/string_util.h" 00028 00029 namespace net_instaweb { 00030 00031 class Statistics; 00032 00035 class BeaconCriticalImagesFinder : public CriticalImagesFinder { 00036 public: 00037 explicit BeaconCriticalImagesFinder(Statistics* stats); 00038 virtual ~BeaconCriticalImagesFinder(); 00039 00040 virtual bool IsMeaningful(const RewriteDriver* driver) const { 00041 return (driver->options()->critical_images_beacon_enabled() && 00042 driver->server_context()->factory()->UseBeaconResultsInFilters()); 00043 } 00044 00045 virtual int PercentSeenForCritical() const { 00046 return kBeaconPercentSeenForCritical; 00047 } 00048 00049 virtual int NumSetsToKeep() const { 00050 return kBeaconNumSetsToKeep; 00051 } 00052 00057 virtual bool IsHtmlCriticalImage(const GoogleString& image_url, 00058 RewriteDriver* driver); 00059 00060 virtual void ComputeCriticalImages(StringPiece url, 00061 RewriteDriver* driver); 00062 00063 virtual const char* GetCriticalImagesCohort() const { 00064 return RewriteDriver::kBeaconCohort; 00065 } 00066 00067 private: 00069 static const int kBeaconPercentSeenForCritical = 80; 00071 static const int kBeaconNumSetsToKeep = 10; 00072 }; 00073 00074 } 00075 00076 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_BEACON_CRITICAL_IMAGES_FINDER_H_