Page Speed Optimization Libraries  1.6.29.3
net/instaweb/rewriter/public/beacon_critical_images_finder.h
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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/util/public/property_cache.h"
00023 #include "net/instaweb/util/public/string.h"
00024 #include "pagespeed/kernel/base/string_util.h"
00025 
00026 namespace net_instaweb {
00027 
00028 class NonceGenerator;
00029 class RewriteDriver;
00030 class Statistics;
00031 
00034 class BeaconCriticalImagesFinder : public CriticalImagesFinder {
00035  public:
00037   BeaconCriticalImagesFinder(
00038       const PropertyCache::Cohort* cohort,
00039       NonceGenerator* nonce_generator,
00040       Statistics* stats);
00041   virtual ~BeaconCriticalImagesFinder();
00042 
00043   virtual bool IsMeaningful(const RewriteDriver* driver) const;
00044 
00045   virtual int PercentSeenForCritical() const {
00046     return kBeaconPercentSeenForCritical;
00047   }
00048 
00049   virtual int NumSetsToKeep() const {
00050     return kBeaconNumSetsToKeep;
00051   }
00052 
00053   virtual void ComputeCriticalImages(RewriteDriver* driver) {}
00054 
00055   virtual const PropertyCache::Cohort* GetCriticalImagesCohort() const {
00056     return cohort_;
00057   }
00058 
00061   static bool UpdateCriticalImagesCacheEntry(
00062       const StringSet* html_critical_images_set,
00063       const StringSet* css_critical_images_set,
00064       const PropertyCache::Cohort* cohort,
00065       AbstractPropertyPage* page);
00066 
00067  private:
00068   virtual GoogleString GetKeyForUrl(const GoogleString& url);
00069 
00071   static const int kBeaconPercentSeenForCritical = 80;
00073   static const int kBeaconNumSetsToKeep = 10;
00074 
00075   const PropertyCache::Cohort* cohort_;
00076   NonceGenerator* nonce_generator_;
00077 };
00078 
00079 }  
00080 
00081 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_BEACON_CRITICAL_IMAGES_FINDER_H_
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