Page Speed Optimization Libraries
1.8.31.2
|
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: 00040 static const char* kImageOnloadCode; 00042 static const char kCriticalImagesBeaconAddedCount[]; 00043 00044 explicit CriticalImagesBeaconFilter(RewriteDriver* driver); 00045 virtual ~CriticalImagesBeaconFilter(); 00046 00047 virtual void DetermineEnabled(); 00048 00049 static void InitStats(Statistics* statistics); 00050 00051 virtual void StartDocumentImpl() { } 00052 virtual void EndDocument(); 00053 virtual void StartElementImpl(HtmlElement* element) { } 00054 virtual void EndElementImpl(HtmlElement* element); 00055 virtual const char* Name() const { return "CriticalImagesBeacon"; } 00056 00060 static bool ShouldApply(RewriteDriver* rewrite_driver); 00061 00062 private: 00064 void Clear(); 00065 00068 void MaybeAddBeaconJavascript(HtmlElement* element); 00069 00070 BeaconMetadata beacon_metadata_; 00071 StringSet image_url_hashes_; 00072 bool insert_beacon_js_; 00074 Variable* critical_images_beacon_added_count_; 00075 00076 bool added_beacon_js_; 00077 00078 DISALLOW_COPY_AND_ASSIGN(CriticalImagesBeaconFilter); 00079 }; 00080 00081 } 00082 00083 #endif ///< NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_BEACON_FILTER_H_