Index: chrome/browser/chromeos/drive/event_logger.h |
diff --git a/chrome/browser/chromeos/drive/event_logger.h b/chrome/browser/chromeos/drive/event_logger.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..e0341088aa29032e621c7428e4c9aabc9ea2f8cb |
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+++ b/chrome/browser/chromeos/drive/event_logger.h |
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+// Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_DRIVE_EVENT_LOGGER_H_ |
+#define CHROME_BROWSER_CHROMEOS_DRIVE_EVENT_LOGGER_H_ |
+ |
+#include <string> |
+#include <deque> |
+ |
+#include "base/basictypes.h" |
+#include "base/time.h" |
+ |
+namespace drive { |
+ |
+// EventLogger is used to expose text messages to chrome:drive-internals, |
+// for diagnosing the behavior of the Drive client. |
+class EventLogger { |
+ public: |
+ // Represents a single event log. |
+ struct Event { |
+ Event(int id, const std::string& what); |
+ int id; // Monotonically increasing ID starting from 0. |
+ base::Time when; // When the event occurred. |
+ std::string what; // What happened. |
+ }; |
+ |
+ // Creates an event logger that keeps the latest |history_size| events. |
+ explicit EventLogger(size_t history_size); |
+ ~EventLogger(); |
+ |
+ // Logs a message. |
+ void Log(const std::string& what); |
+ |
+ // Gets the list of latest events (the oldest event comes first). |
+ const std::deque<Event>& history() const { return history_; } |
+ |
+ private: |
+ std::deque<Event> history_; |
+ const size_t history_size_; |
+ int next_event_id_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(EventLogger); |
+}; |
+ |
+} // namespace drive |
+ |
+#endif // CHROME_BROWSER_CHROMEOS_DRIVE_EVENT_LOGGER_H_ |