core/app/CMS/Pipeline/DisplayPipeline/DisplayPipeline.php

<?php
namespace App\CMS\Pipeline\DisplayPipeline;

use App\CMS\Contracts\Content\DisplayPipeline\Pipeline;
use App\CMS\Contracts\Content\DisplayPipeline\Process;
use App\CMS\Pipeline\AbstractPipeline;
use App\Models\Content\Content;

class DisplayPipeline extends AbstractPipeline implements Pipeline
{
    /**
     * DisplayPipeline constructor.
     */
    public function __construct()
    {
        $this->acceptedProcessInterface = Process::class;
    }

    /**
     * Run pipeline
     *
     * @param Content $page
     *
     * @return Content
     */
    function run(Content $page)
    {
        $this->runBeforeStart($page);

        foreach ($this->processes as $process) {
            /**
             * @var $run Process
             */
            $run = new $process;
            $run->handle($page);
        }

        $this->runBeforeRender($page);

        return $page;
    }

    protected function runBeforeStart($page)
    {
        if (!is_null($this->beforeStart)) {
            $process = new $this->beforeStart;
            $process->handle($page);
        }
    }

    protected  function runBeforeRender($page)
    {
        if (!is_null($this->beforeRender)) {
            $process = new $this->beforeRender;
            $process->handle($page);
        }
    }
}