example flysystem plugin for reference

myPlugin.php

<?php
namespace League\Flysystem\Plugin;
use League\Flysystem\FilesystemInterface;
class MyExample extends AbstractPlugin{
    protected $filesystem;

    public function setFilesystem(FilesystemInterface $filesystem){
        $this->filesystem = $filesystem;
    }

    public function getMethod(){
        return 'myExample';
    }
    /** does the samething as "update" and is just here for reference **/
    public function handle($path, $contents){
        return $this->filesystem->update($path, $contents);
    }
}

https://github.com/thephpleague/flysystem-adapter-decorator for later....