}

    /**
     * Pops a handler from the stack
     *
     * @return HandlerInterface
     */
    public function popHandler()
    {
        if (!$this->handlers) {
            throw new \LogicException('You tried to pop from an empty handler stack.');
        }

        return array_shift($this->handlers);
    }

    /**
     * Set handlers, replacing all existing ones.
     *
     * If a map is passed, keys will be ignored.
     *
     * @param  HandlerInterface[] $handlers
     * @return $this
     */
    public function setHandlers(array $handlers)
    {
        $this->handlers = array();
        foreach (array_reverse($handlers) as $handler) {
            $this->pushHandler($handler);
        }

        return $this;
    }

    /**
     * @return HandlerInterface[]
     */
    public function getHandlers()
    {
        return $this->handlers;
    }

    /**
     * Adds a processor on to the stack.
     *
     * @param  callable $callback
     * @return $this
     */
    public function pushProcessor($callback)
    {
        if (!is_callable($callback)) {
            throw new \InvalidArgumentException('Processors must be valid callables (callback or object with an __invoke method), '.var_export($callback, true).' given');
        }
        array_unshift($this->processors, $callback);

        return $this;
    }

    /**
     * Removes the processor on top of the stack and returns it.
     *
     * @return callable
     */
    public function popProcessor()
    {
        if (!$this->processors) {
            throw new \LogicException('You tried to pop from an empty processor stack.');
        }

        return array_shift($this->processors);
    }

    /**
     * @return callable[]
     */
    public function getProcessors()
    {
        return $this->processors;
    }

    /**
     * Control the use of microsecond resolution timestamps in the 'datetime'
     * member of new records.
     *
     * Generating microsecond resolution timestamps by calling
     * microtime(true), formatting the result via sprintf() and then parsing
     * the resulting string via \DateTime::createFromFormat() can incur
     * a measurable runtime overhead vs simple usage of DateTime to capture
     * a second resolution timestamp in systems which generate a large number
     * of log events.
     *
     * @param bool $micro True to use microtime() to create timestamps
     */
    public function useMicrosecondTimestamps($micro)
    {
        $this->microsecondTimestamps = (bool) $micro;
    }

    /**
     * Adds a log record.
     *
     * @param  int     $level   The logging level
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function addRecord($level, $message, array $context = array())
    {
        if (!$this->handlers) {
            $this->pushHandler(new StreamHandler('php://stderr', static::DEBUG));
        }

        $levelName = static::getLevelName($level);

        // check if any handler will handle this message so we can return early and save cycles
        $handlerKey = null;
        reset($this->handlers);
        while ($handler = current($this->handlers)) {
            if ($handler->isHandling(array('level' => $level))) {
                $handlerKey = key($this->handlers);
                break;
            }

            next($this->handlers);
        }

        if (null === $handlerKey) {
            return false;
        }

        if (!static::$timezone) {
            static::$timezone = new \DateTimeZone(date_default_timezone_get() ?: 'UTC');
        }

        // php7.1+ always has microseconds enabled, so we do not need this hack
        if ($this->microsecondTimestamps && PHP_VERSION_ID < 70100) {
            $ts = \DateTime::createFromFormat('U.u', sprintf('%.6F', microtime(true)), static::$timezone);
        } else {
            $ts = new \DateTime(null, static::$timezone);
        }
        $ts->setTimezone(static::$timezone);

        $record = array(
            'message' => (string) $message,
            'context' => $context,
            'level' => $level,
            'level_name' => $levelName,
            'channel' => $this->name,
            'datetime' => $ts,
            'extra' => array(),
        );

        foreach ($this->processors as $processor) {
            $record = call_user_func($processor, $record);
        }

        while ($handler = current($this->handlers)) {
            if (true === $handler->handle($record)) {
                break;
            }

            next($this->handlers);
        }

        return true;
    }

    /**
     * Adds a log record at the DEBUG level.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function addDebug($message, array $context = array())
    {
        return $this->addRecord(static::DEBUG, $message, $context);
    }

    /**
     * Adds a log record at the INFO level.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function addInfo($message, array $context = array())
    {
        return $this->addRecord(static::INFO, $message, $context);
    }

    /**
     * Adds a log record at the NOTICE level.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function addNotice($message, array $context = array())
    {
        return $this->addRecord(static::NOTICE, $message, $context);
    }

    /**
     * Adds a log record at the WARNING level.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function addWarning($message, array $context = array())
    {
        return $this->addRecord(static::WARNING, $message, $context);
    }

    /**
     * Adds a log record at the ERROR level.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function addError($message, array $context = array())
    {
        return $this->addRecord(static::ERROR, $message, $context);
    }

    /**
     * Adds a log record at the CRITICAL level.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function addCritical($message, array $context = array())
    {
        return $this->addRecord(static::CRITICAL, $message, $context);
    }

    /**
     * Adds a log record at the ALERT level.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function addAlert($message, array $context = array())
    {
        return $this->addRecord(static::ALERT, $message, $context);
    }

    /**
     * Adds a log record at the EMERGENCY level.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function addEmergency($message, array $context = array())
    {
        return $this->addRecord(static::EMERGENCY, $message, $context);
    }

    /**
     * Gets all supported logging levels.
     *
     * @return array Assoc array with human-readable level names => level codes.
     */
    public static function getLevels()
    {
        return array_flip(static::$levels);
    }

    /**
     * Gets the name of the logging level.
     *
     * @param  int    $level
     * @return string
     */
    public static function getLevelName($level)
    {
        if (!isset(static::$levels[$level])) {
            throw new InvalidArgumentException('Level "'.$level.'" is not defined, use one of: '.implode(', ', array_keys(static::$levels)));
        }

        return static::$levels[$level];
    }

    /**
     * Converts PSR-3 levels to Monolog ones if necessary
     *
     * @param string|int Level number (monolog) or name (PSR-3)
     * @return int
     */
    public static function toMonologLevel($level)
    {
        if (is_string($level) && defined(__CLASS__.'::'.strtoupper($level))) {
            return constant(__CLASS__.'::'.strtoupper($level));
        }

        return $level;
    }

    /**
     * Checks whether the Logger has a handler that listens on the given level
     *
     * @param  int     $level
     * @return Boolean
     */
    public function isHandling($level)
    {
        $record = array(
            'level' => $level,
        );

        foreach ($this->handlers as $handler) {
            if ($handler->isHandling($record)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Adds a log record at an arbitrary level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  mixed   $level   The log level
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function log($level, $message, array $context = array())
    {
        $level = static::toMonologLevel($level);

        return $this->addRecord($level, $message, $context);
    }

    /**
     * Adds a log record at the DEBUG level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function debug($message, array $context = array())
    {
        return $this->addRecord(static::DEBUG, $message, $context);
    }

    /**
     * Adds a log record at the INFO level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function info($message, array $context = array())
    {
        return $this->addRecord(static::INFO, $message, $context);
    }

    /**
     * Adds a log record at the NOTICE level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function notice($message, array $context = array())
    {
        return $this->addRecord(static::NOTICE, $message, $context);
    }

    /**
     * Adds a log record at the WARNING level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function warn($message, array $context = array())
    {
        return $this->addRecord(static::WARNING, $message, $context);
    }

    /**
     * Adds a log record at the WARNING level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function warning($message, array $context = array())
    {
        return $this->addRecord(static::WARNING, $message, $context);
    }

    /**
     * Adds a log record at the ERROR level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function err($message, array $context = array())
    {
        return $this->addRecord(static::ERROR, $message, $context);
    }

    /**
     * Adds a log record at the ERROR level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function error($message, array $context = array())
    {
        return $this->addRecord(static::ERROR, $message, $context);
    }

    /**
     * Adds a log record at the CRITICAL level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function crit($message, array $context = array())
    {
        return $this->addRecord(static::CRITICAL, $message, $context);
    }

    /**
     * Adds a log record at the CRITICAL level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function critical($message, array $context = array())
    {
        return $this->addRecord(static::CRITICAL, $message, $context);
    }

    /**
     * Adds a log record at the ALERT level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function alert($message, array $context = array())
    {
        return $this->addRecord(static::ALERT, $message, $context);
    }

    /**
     * Adds a log record at the EMERGENCY level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function emerg($message, array $context = array())
    {
        return $this->addRecord(static::EMERGENCY, $message, $context);
    }

    /**
     * Adds a log record at the EMERGENCY level.
     *
     * This method allows for compatibility with common interfaces.
     *
     * @param  string  $message The log message
     * @param  array   $context The log context
     * @return Boolean Whether the record has been processed
     */
    public function emergency($message, array $context = array())
    {
        return $this->addRecord(static::EMERGENCY, $message, $context);
    }

    /**
     * Set the timezone to be used for the timestamp of log records.
     *
     * This is stored globally for all Logger instances
     *
     * @param \DateTimeZone $tz Timezone object
     */
    public static function setTimezone(\DateTimeZone $tz)
    {
        self::$timezone = $tz;
    }
}