Page Speed Optimization Libraries
1.4.26.1
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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 00058 virtual const char* GetCohort() const = 0; 00059 00060 protected: 00061 PropertyValue* GetPropertyValue(RewriteDriver* driver); 00062 00063 private: 00064 TimedVariable* critical_css_valid_count_; 00065 TimedVariable* critical_css_expired_count_; 00066 TimedVariable* critical_css_not_found_count_; 00067 00068 DISALLOW_COPY_AND_ASSIGN(CriticalCssFinder); 00069 }; 00070 00071 } 00072 00073 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_CSS_FINDER_H_