src/base/trace_event/event_name_filter.h

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_TRACE_EVENT_EVENT_NAME_FILTER_H_
#define BASE_TRACE_EVENT_EVENT_NAME_FILTER_H_

#include <memory>
#include <string>
#include <unordered_set>

#include "base/base_export.h"
#include "base/macros.h"
#include "base/trace_event/trace_event_filter.h"

namespace base {
namespace trace_event {

class TraceEvent;

// Filters trace events by checking the full name against a whitelist.
// The current implementation is quite simple and dumb and just uses a
// hashtable which requires char* to std::string conversion. It could be smarter
// and use a bloom filter trie. However, today this is used too rarely to
// justify that cost.
class BASE_EXPORT EventNameFilter : public TraceEventFilter {
 public:
  using EventNamesWhitelist = std::unordered_set<std::string>;
  static const char kName[];

  EventNameFilter(std::unique_ptr<EventNamesWhitelist>);
  ~EventNameFilter() override;

  // TraceEventFilter implementation.
  bool FilterTraceEvent(const TraceEvent&) const override;

 private:
  std::unique_ptr<const EventNamesWhitelist> event_names_whitelist_;

  DISALLOW_COPY_AND_ASSIGN(EventNameFilter);
};

}  // namespace trace_event
}  // namespace base

#endif  // BASE_TRACE_EVENT_EVENT_NAME_FILTER_H_