Progress.php

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<?php
namespace Magento\Setup\Model\Installer;

class Progress
{
    private $total;

    private $current;

    public function __construct($total, $current = 0)
    {
        $this->validate($total, $current);
        $this->total = $total;
        $this->current = $current;
    }

    public function setNext()
    {
        $this->validate($this->total, $this->current + 1);
        $this->current++;
    }

    public function finish()
    {
        $this->current = $this->total;
    }

    public function getCurrent()
    {
        return $this->current;
    }

    public function getTotal()
    {
        return $this->total;
    }

    public function getRatio()
    {
        return $this->current / $this->total;
    }

    private function validate($total, $current)
    {
        if (empty($total) || 0 >= $total) {
            throw new \LogicException('Total number must be more than zero.');
        }
        if ($current > $total) {
            throw new \LogicException('Current cannot exceed total number.');
        }
    }
}