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| 1 // Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_DRIVE_EVENT_LOGGER_H_ |
| 6 #define CHROME_BROWSER_CHROMEOS_DRIVE_EVENT_LOGGER_H_ |
| 7 |
| 8 #include <string> |
| 9 #include <deque> |
| 10 |
| 11 #include "base/basictypes.h" |
| 12 #include "base/time.h" |
| 13 |
| 14 namespace drive { |
| 15 |
| 16 // EventLogger is used to expose text messages to chrome:drive-internals, |
| 17 // for diagnosing the behavior of the Drive client. |
| 18 class EventLogger { |
| 19 public: |
| 20 // Represents a single event log. |
| 21 struct Event { |
| 22 Event(int id, const std::string& what); |
| 23 int id; // Monotonically increasing ID starting from 0. |
| 24 base::Time when; // When the event occurred. |
| 25 std::string what; // What happened. |
| 26 }; |
| 27 |
| 28 // Creates an event logger that keeps the latest |history_size| events. |
| 29 explicit EventLogger(size_t history_size); |
| 30 ~EventLogger(); |
| 31 |
| 32 // Logs a message. |
| 33 void Log(const std::string& what); |
| 34 |
| 35 // Gets the list of latest events (the oldest event comes first). |
| 36 const std::deque<Event>& history() const { return history_; } |
| 37 |
| 38 private: |
| 39 std::deque<Event> history_; |
| 40 const size_t history_size_; |
| 41 int next_event_id_; |
| 42 |
| 43 DISALLOW_COPY_AND_ASSIGN(EventLogger); |
| 44 }; |
| 45 |
| 46 } // namespace drive |
| 47 |
| 48 #endif // CHROME_BROWSER_CHROMEOS_DRIVE_EVENT_LOGGER_H_ |
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