Page Speed Optimization Libraries  1.5.27.2
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/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_
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