//// Copyright (c) 2016, Andy Frank// Licensed under the Academic Free License version 3.0//// History:// 23 Aug 2016 Andy Frank Creation//using concurrent**** System models a target system image.**constclass System{** It-block ctor.new make(|This| f){ f(this)this.uri =("https://github.com/nerves-project/nerves_system_${name}/releases/download" +"/v${version}/nerves_system_${name}-v${version}.tar.gz").toUri}** Unique name for this systemconst Str name** Vesion of system.const Version version** URI to fetch system image.const Uri uri** JRE platform for this system.const Str jre** List available systems.static System[] list(){ Actor.locals["sys.list"]}** Find System with given name. If system not found throw** Err if 'checked' is true, otherwise return 'null'.static System? find(Str name, Bool checked := true){ sys := list.find |s| { s.name == name }if(sys == null && checked)throw Err("System not found '$name'")return sys}}