Page Speed Optimization Libraries  1.5.27.2
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 CriticalCssResult;
00028 class PropertyValue;
00029 class RewriteDriver;
00030 class Statistics;
00031 class TimedVariable;
00032 
00033 
00035 class CriticalCssFinder {
00036  public:
00037   static const char kCriticalCssValidCount[];
00038   static const char kCriticalCssExpiredCount[];
00039   static const char kCriticalCssNotFoundCount[];
00040   static const char kCriticalCssPropertyName[];
00041 
00042   explicit CriticalCssFinder(Statistics* stats);
00043   virtual ~CriticalCssFinder();
00044 
00045   static void InitStats(Statistics* statistics);
00046 
00049   virtual CriticalCssResult* GetCriticalCssFromCache(RewriteDriver* driver);
00050 
00052   virtual void ComputeCriticalCss(StringPiece url, RewriteDriver* driver) = 0;
00053 
00055   virtual bool UpdateCache(RewriteDriver* driver,
00056                            const CriticalCssResult& result);
00057 
00061   virtual void UpdateCriticalCssInfoInDriver(RewriteDriver* driver);
00062 
00067   virtual CriticalCssResult* GetCriticalCss(RewriteDriver* driver);
00068 
00069   virtual const char* GetCohort() const = 0;
00070 
00071  protected:
00072   PropertyValue* GetPropertyValue(RewriteDriver* driver);
00073 
00074  private:
00075   TimedVariable* critical_css_valid_count_;
00076   TimedVariable* critical_css_expired_count_;
00077   TimedVariable* critical_css_not_found_count_;
00078 
00079   DISALLOW_COPY_AND_ASSIGN(CriticalCssFinder);
00080 };
00081 
00082 }  
00083 
00084 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_FINDER_H_
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