Page Speed Optimization Libraries  1.7.30.4
net/instaweb/rewriter/public/critical_images_beacon_filter.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_IMAGES_BEACON_FILTER_H_
00020 #define NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_BEACON_FILTER_H_
00021 
00022 #include "net/instaweb/rewriter/public/common_filter.h"
00023 #include "net/instaweb/rewriter/public/critical_finder_support_util.h"
00024 #include "net/instaweb/util/public/basictypes.h"
00025 #include "pagespeed/kernel/base/string_util.h"
00026 
00027 namespace net_instaweb {
00028 
00029 class HtmlElement;
00030 class RewriteDriver;
00031 class Statistics;
00032 class Variable;
00033 
00038 class CriticalImagesBeaconFilter : public CommonFilter {
00039  public:
00041   static const char kCriticalImagesBeaconAddedCount[];
00042 
00043   explicit CriticalImagesBeaconFilter(RewriteDriver* driver);
00044   virtual ~CriticalImagesBeaconFilter();
00045 
00046   virtual void DetermineEnabled();
00047 
00048   static void InitStats(Statistics* statistics);
00049 
00050   virtual void StartDocumentImpl() { }
00051   virtual void EndDocument();
00052   virtual void StartElementImpl(HtmlElement* element) { }
00053   virtual void EndElementImpl(HtmlElement* element);
00054   virtual const char* Name() const { return "CriticalImagesBeacon"; }
00055 
00059   static bool ShouldApply(RewriteDriver* rewrite_driver);
00060 
00061  private:
00063   void Clear();
00064 
00065   BeaconMetadata beacon_metadata_;
00066   StringSet image_url_hashes_;
00067   bool insert_beacon_js_;
00069   Variable* critical_images_beacon_added_count_;
00070 
00071   DISALLOW_COPY_AND_ASSIGN(CriticalImagesBeaconFilter);
00072 };
00073 
00074 }  
00075 
00076 #endif  ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_BEACON_FILTER_H_
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