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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_DRIVE_EVENT_LOGGER_H_
#define CHROME_BROWSER_DRIVE_EVENT_LOGGER_H_
#include <stdarg.h> // va_list
#include <deque>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/synchronization/lock.h"
#include "base/time.h"
namespace drive {
// The default history size used by EventLogger.
const int kDefaultHistorySize = 1000;
// EventLogger is used to collect and expose text messages for diagnosing
// behaviors of Google APIs stuff. For instance, the collected messages are
// exposed to chrome:drive-internals.
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 kDefaultHistorySize events.
EventLogger();
~EventLogger();
// Logs a message using printf format.
// Can be called from any thread as long as the object is alive.
// Note that PRINTF_FORMAT should be (2, 3) instead of (1, 2) as this is a
// C++ member function.
void Log(const char* format, ...) PRINTF_FORMAT(2, 3);
// Sets the history size. The existing history is cleared.
// Can be called from any thread as long as the object is alive.
void SetHistorySize(size_t history_size);
// Gets the list of latest events (the oldest event comes first).
// Can be called from any thread as long as the object is alive.
std::vector<Event> GetHistory();
private:
std::deque<Event> history_; // guarded by lock_.
size_t history_size_; // guarded by lock_.
int next_event_id_; // guarded by lock_.
base::Lock lock_;
DISALLOW_COPY_AND_ASSIGN(EventLogger);
};
} // namespace drive
#endif // CHROME_BROWSER_DRIVE_EVENT_LOGGER_H_
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