cx-newsletter/components/01-plugin_updater.php

<?php

namespace cx_newsletter;

class plugin_updater 
extends plugin_worker
implements plugin_worker_interface {
    public function update() : void { 
        $init_settings = !(
            $this
            ->get_settings()
            ->is_initializated()
        );

        $init_database = !(
            $this
            ->get_versions()
            ->is_installed()
        );

        if ($init_settings or $init_database) {
            $this
            ->install();
        }


        $this
        ->get_installer()
        ->update();
    }

    public function install() : void {
        $this
        ->remove();
        
        $this
        ->get_settings()
        ->init();
        
        $this
        ->get_installer()
        ->init()
        ->update();
    }

    public function remove() : void {
        $this
        ->get_settings()
        ->clean();

        $this
        ->get_installer()
        ->clean();
    }

    private function get_installer() : database_installer {
        if ($this->installer !== null) {
            return $this->installer;
        }   

        $this->installer = new database_installer(
            $this->get_database(),
            $this->get_tables(),
            $this->get_versions()
        );

        return $this->get_installer();
    }

    private ?database_installer $installer = null;
}