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Side by Side Diff: chrome/browser/chromeos/drive/event_logger.h

Issue 11365249: drive: Event logger for chrome:drive-internals. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Review fix (#2, #3). Created 1 year, 5 months ago
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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;
satorux1 2012/11/14 07:59:30 Please document that this is a monotonically incre
kinaba 2012/11/14 08:13:36 Done.
24 base::Time when;
satorux1 2012/11/14 07:59:30 ; // When the event occurred.
kinaba 2012/11/14 08:13:36 Done.
25 std::string what;
satorux1 2012/11/14 07:59:30 ; // What happened.
kinaba 2012/11/14 08:13:36 Done.
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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