Page Speed Optimization Libraries  1.4.26.1
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_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_
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