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 */ 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_options.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 Statistics; 00030 00033 class BeaconCriticalImagesFinder : public CriticalImagesFinder { 00034 public: 00035 explicit BeaconCriticalImagesFinder(Statistics* stats); 00036 virtual ~BeaconCriticalImagesFinder(); 00037 00038 virtual bool IsMeaningful(const RewriteDriver* driver) const { 00039 return driver->options()->critical_images_beacon_enabled(); 00040 } 00041 00042 virtual int PercentSeenForCritical() const { 00043 return kBeaconPercentSeenForCritical; 00044 } 00045 00046 virtual int NumSetsToKeep() const { 00047 return kBeaconNumSetsToKeep; 00048 } 00049 00054 virtual bool IsHtmlCriticalImage(const GoogleString& image_url, 00055 RewriteDriver* driver); 00056 00057 virtual void ComputeCriticalImages(StringPiece url, 00058 RewriteDriver* driver); 00059 00060 virtual const char* GetCriticalImagesCohort() const { 00061 return RewriteDriver::kBeaconCohort; 00062 } 00063 00064 private: 00066 static const int kBeaconPercentSeenForCritical = 80; 00068 static const int kBeaconNumSetsToKeep = 10; 00069 }; 00070 00071 } 00072 00073 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_BEACON_CRITICAL_IMAGES_FINDER_H_