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<?php
/**
* Akeeba Engine
*
* @package akeebaengine
* @copyright Copyright (c)2006-2022 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license GNU General Public License version 3, or later
*/
namespace Akeeba\Engine\Util\Log;
defined('AKEEBAENGINE') || die();
/**
* The interface for Akeeba Engine logger objects
*/
interface LogInterface
{
/**
* Open a new log instance with the specified tag. If another log is already open it is closed before switching to
* the new log tag. If the tag is null use the default log defined in the logging system.
*
* @param string|null $tag The log to open
* @param string $extension The log file extension (default: .php, use empty string for .log files)
*
* @return void
*/
public function open($tag = null, $extension = '.php');
/**
* Close the currently active log and set the current tag to null.
*
* @return void
*/
public function close();
/**
* Reset (remove entries) of the log with the specified tag.
*
* @param string|null $tag The log to reset
*
* @return void
*/
public function reset($tag = null);
/**
* Add a message to the log
*
* @param string $level One of the Psr\Log\LogLevel constants
* @param string $message The message to log
* @param array $context Currently not used. Left here for PSR-3 compatibility.
*
* @return void
*/
public function log($level, $message, array $context = []);
/**
* Temporarily pause log output. The log() method MUST respect this.
*
* @return void
*/
public function pause();
/**
* Resume the previously paused log output. The log() method MUST respect this.
*
* @return void
*/
public function unpause();
/**
* Returns the timestamp (in UNIX time long integer format) of the last log message written to the log with the
* specific tag. The timestamp MUST be read from the log itself, not from the logger object. It is used by the
* engine to find out the age of stalled backups which may have crashed.
*
* @param string|null $tag The log tag for which the last timestamp is returned
*
* @return int|null The timestamp of the last log message, in UNIX time. NULL if we can't get the timestamp.
*/
public function getLastTimestamp($tag = null);
}