1 // Copyright 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef BASE_TRACE_EVENT_EVENT_NAME_FILTER_H_
6 #define BASE_TRACE_EVENT_EVENT_NAME_FILTER_H_
7 
8 #include <memory>
9 #include <string>
10 #include <unordered_set>
11 
12 #include "base/base_export.h"
13 #include "base/macros.h"
14 #include "base/trace_event/trace_event_filter.h"
15 
16 namespace base {
17 namespace trace_event {
18 
19 class TraceEvent;
20 
21 // Filters trace events by checking the full name against a whitelist.
22 // The current implementation is quite simple and dumb and just uses a
23 // hashtable which requires char* to std::string conversion. It could be smarter
24 // and use a bloom filter trie. However, today this is used too rarely to
25 // justify that cost.
26 class BASE_EXPORT EventNameFilter : public TraceEventFilter {
27  public:
28   using EventNamesWhitelist = std::unordered_set<std::string>;
29   static const char kName[];
30 
31   EventNameFilter(std::unique_ptr<EventNamesWhitelist>);
32   ~EventNameFilter() override;
33 
34   // TraceEventFilter implementation.
35   bool FilterTraceEvent(const TraceEvent&) const override;
36 
37  private:
38   std::unique_ptr<const EventNamesWhitelist> event_names_whitelist_;
39 
40   DISALLOW_COPY_AND_ASSIGN(EventNameFilter);
41 };
42 
43 }  // namespace trace_event
44 }  // namespace base
45 
46 #endif  // BASE_TRACE_EVENT_EVENT_NAME_FILTER_H_
47