public function getContext()
    {
        $context = [
            'log_cmd_insert'    => [$this, 'onInsert'],
            'log_cmd_delete'    => [$this, 'onDelete'],
            'log_cmd_update'    => [$this, 'onUpdate'],
            'log_insert'        => [$this, 'onInsert'],
            'log_delete'        => [$this, 'onDelete'],
            'log_update'        => [$this, 'onUpdate'],
            'log_batchinsert'   => [$this, 'onBatchInsert'],
            'log_write_batch'   => [$this, 'onBatchInsert'],
            'log_query'         => [$this, 'onQuery']
        ];
        return $context;
    }