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critical_images_beacon_filter.h
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1 /*
2  * Copyright 2013 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http:///www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
18 
19 #ifndef NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_BEACON_FILTER_H_
20 #define NET_INSTAWEB_REWRITER_PUBLIC_CRITICAL_IMAGES_BEACON_FILTER_H_
21 
24 #include "pagespeed/kernel/base/basictypes.h"
25 #include "pagespeed/kernel/base/string_util.h"
26 
27 namespace net_instaweb {
28 
29 class HtmlElement;
30 class RewriteDriver;
31 class Statistics;
32 class Variable;
33 
39  public:
40  static const char* kImageOnloadCode;
42  static const char kCriticalImagesBeaconAddedCount[];
43 
44  explicit CriticalImagesBeaconFilter(RewriteDriver* driver);
45  virtual ~CriticalImagesBeaconFilter();
46 
47  virtual void DetermineEnabled(GoogleString* disabled_reason);
48 
49  static void InitStats(Statistics* statistics);
50 
51  virtual void StartDocumentImpl() { }
52  virtual void EndDocument();
53  virtual void StartElementImpl(HtmlElement* element) { }
54  virtual void EndElementImpl(HtmlElement* element);
55  virtual const char* Name() const { return "CriticalImagesBeacon"; }
56 
60  static bool ShouldApply(RewriteDriver* rewrite_driver);
61 
62  private:
64  void Clear();
65 
68  void MaybeAddBeaconJavascript(HtmlElement* element);
69 
70  BeaconMetadata beacon_metadata_;
71  StringSet image_url_hashes_;
72  bool insert_beacon_js_;
74  Variable* critical_images_beacon_added_count_;
75 
76  bool added_beacon_js_;
77 
78  DISALLOW_COPY_AND_ASSIGN(CriticalImagesBeaconFilter);
79 };
80 
81 }
82 
83 #endif
Definition: common_filter.h:48
static bool ShouldApply(RewriteDriver *rewrite_driver)
Definition: critical_images_beacon_filter.h:38
static const char kCriticalImagesBeaconAddedCount[]
Counters.
Definition: critical_images_beacon_filter.h:42
Definition: rewrite_driver.h:98
virtual void StartDocumentImpl()
Definition: critical_images_beacon_filter.h:51