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// Copyright 2015 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 COMPONENTS_PROXIMITY_AUTH_LOGGING_LOG_BUFFER_H
#define COMPONENTS_PROXIMITY_AUTH_LOGGING_LOG_BUFFER_H
#include <list>
#include "base/logging.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "base/time/time.h"
namespace proximity_auth {
// Contains logs specific to the Proximity Auth. This buffer has a maximum size
// and will discard entries in FIFO order.
// Call LogBuffer::GetInstance() to get the global LogBuffer instance.
class LogBuffer {
public:
// Represents a single log entry in the log buffer.
struct LogMessage {
const std::string text;
const base::Time time;
const std::string file;
const int line;
const logging::LogSeverity severity;
LogMessage(const std::string& text,
const base::Time& time,
const std::string& file,
int line,
logging::LogSeverity severity);
};
class Observer {
public:
// Called when a new message is added to the log buffer.
virtual void OnLogMessageAdded(const LogMessage& log_message) = 0;
// Called when all messages in the log buffer are cleared.
virtual void OnLogBufferCleared() = 0;
};
LogBuffer();
~LogBuffer();
// Returns the global instance.
static LogBuffer* GetInstance();
// Adds and removes log buffer observers.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Adds a new log message to the buffer. If the number of log messages exceeds
// the maximum, then the earliest added log will be removed.
void AddLogMessage(const LogMessage& log_message);
// Clears all logs in the buffer.
void Clear();
// Returns the maximum number of logs that can be stored.
size_t MaxBufferSize() const;
// Returns the list logs in the buffer, sorted chronologically.
const std::list<LogMessage>* logs() { return &log_messages_; }
private:
// The messages currently in the buffer.
std::list<LogMessage> log_messages_;
// List of observers.
ObserverList<Observer> observers_;
DISALLOW_COPY_AND_ASSIGN(LogBuffer);
};
} // namespace proximity_auth
#endif // COMPONENTS_PROXIMITY_AUTH_LOGGING_LOG_BUFFER_H
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