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
