Page Speed Optimization Libraries  1.3.25.1
net/instaweb/rewriter/public/critical_css_finder.h
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00001 /*
00002  * Copyright 2013 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_CSS_FINDER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_FINDER_H_
00021 
00022 #include "net/instaweb/util/public/basictypes.h"
00023 #include "net/instaweb/util/public/string_util.h"
00024 
00025 namespace net_instaweb {
00026 
00027 class PropertyValue;
00028 class RewriteDriver;
00029 class Statistics;
00030 class TimedVariable;
00031 
00033 class CriticalCssFinder {
00034  public:
00035   static const char kCriticalCssValidCount[];
00036   static const char kCriticalCssExpiredCount[];
00037   static const char kCriticalCssNotFoundCount[];
00038 
00039   explicit CriticalCssFinder(Statistics* stats);
00040   virtual ~CriticalCssFinder();
00041 
00042   static void InitStats(Statistics* statistics);
00043 
00045   virtual StringStringMap* CriticalCssMap(RewriteDriver* driver);
00046 
00048   virtual void ComputeCriticalCss(StringPiece url, RewriteDriver* driver) = 0;
00049 
00051   virtual bool UpdateCache(RewriteDriver* driver,
00052                            const StringStringMap& critical_css_map);
00053 
00054   virtual const char* GetCohort() const = 0;
00055 
00056  protected:
00057   PropertyValue* GetPropertyValue(RewriteDriver* driver);
00058 
00059  private:
00060   static const char kCriticalCssPropertyName[];
00061 
00063   StringStringMap* DeserializeCacheData(RewriteDriver* driver,
00064                                         const PropertyValue* property_value);
00065 
00066   TimedVariable* critical_css_valid_count_;
00067   TimedVariable* critical_css_expired_count_;
00068   TimedVariable* critical_css_not_found_count_;
00069 
00070   DISALLOW_COPY_AND_ASSIGN(CriticalCssFinder);
00071 };
00072 
00073 }  
00074 
00075 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_FINDER_H_
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