Page Speed Optimization Libraries  1.2.24.1
net/instaweb/rewriter/public/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  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_FINDER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_FINDER_H_
00021 
00022 #include "net/instaweb/util/public/basictypes.h"
00023 #include "net/instaweb/util/public/string.h"
00024 #include "net/instaweb/util/public/string_util.h"
00025 
00026 namespace net_instaweb {
00027 
00028 class PropertyCache;
00029 class PropertyPage;
00030 class PropertyValue;
00031 class RewriteDriver;
00032 class Statistics;
00033 class Variable;
00034 
00037 class CriticalImagesFinder {
00038  public:
00039   static const char kCriticalImagesValidCount[];
00040   static const char kCriticalImagesExpiredCount[];
00041   static const char kCriticalImagesNotFoundCount[];
00042 
00043   explicit CriticalImagesFinder(Statistics* stats);
00044   virtual ~CriticalImagesFinder();
00045 
00046   static void InitStats(Statistics* statistics);
00047 
00051   virtual bool IsMeaningful() const = 0;
00052 
00057   virtual bool IsCriticalImage(const GoogleString& image_url,
00058                                const RewriteDriver* driver) const;
00059 
00062   virtual void UpdateCriticalImagesSetInDriver(RewriteDriver* driver);
00063 
00065   virtual void ComputeCriticalImages(StringPiece url,
00066                                      RewriteDriver* driver) = 0;
00067 
00070   virtual const char* GetCriticalImagesCohort() const = 0;
00071 
00076   bool UpdateCriticalImagesCacheEntryFromDriver(
00077       RewriteDriver* driver,
00078       StringSet* critical_images_set,
00079       StringSet* css_critical_images_set);
00080 
00085   bool UpdateCriticalImagesCacheEntry(
00086       PropertyPage* page,
00087       PropertyCache* page_property_cache,
00088       StringSet* critical_images_set,
00089       StringSet* css_critical_images_set);
00090 
00091  private:
00092   static const char kCriticalImagesPropertyName[];
00093   static const char kCssCriticalImagesPropertyName[];
00094 
00098   StringSet* ExtractCriticalImagesSet(
00099       RewriteDriver* driver,
00100       const PropertyValue* property_value,
00101       bool track_stats);
00102 
00103   Variable* critical_images_valid_count_;
00104   Variable* critical_images_expired_count_;
00105   Variable* critical_images_not_found_count_;
00106 
00107   friend class CriticalImagesFinderTestBase;
00108   DISALLOW_COPY_AND_ASSIGN(CriticalImagesFinder);
00109 };
00110 
00111 }  
00112 
00113 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_FINDER_H_
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