[Ironruby-core] Regarding IronRuby... How true it sounds from this blog

Tomas Matousek Tomas.Matousek at microsoft.com
Mon Apr 28 18:58:25 EDT 2008

So, one of the "details" that are wrong is that we don't support multiple isolated engines in a single process.
It's actually quite simple to do so via DLR Hosting API. The main concept here is ScriptRuntime. This class represents the world for a dynamic language. The class holds on loaded assemblies, .NET namespace references, etc. Each language could also associate its own global state with the runtime. IronRuby has all Ruby global state there: global variables table, class hierarchy etc. So, unless you use CLR interop, there is no way how the script could get outside this sandbox. If you want to isolate the runtimes even more (for CLR interop) you can always create a ScriptRuntime inside a separate app-domain.

Let's show some example (a self-contained C# source code of a simple IronRuby host follows):

using System.IO;
using Microsoft.Scripting.Hosting;

    class RubyHostingExample {
        public static void Main() {
            const string write = @"C:\Temp\write.rb";
            const string read = @"C:\Temp\read.rb";

            File.WriteAllText(write, @"
$x = 'Hello from runtime #1!'
C = 'some constant'

module Kernel
  def say_bye
     puts 'bye'

            File.WriteAllText(read, @"
puts $x
if defined? C
  puts C
  puts 'C not defined'
say_bye rescue puts $!

            ScriptRuntime runtime1 = ScriptRuntime.Create();
            ScriptRuntime runtime2 = ScriptRuntime.Create();



Let's compile and run it:

C:\IronRuby\Bin\Debug>csc /r:Microsoft.Scripting.dll /r:Microsoft.Scripting.Core.dll /r:IronRuby.dll rt.cs
Microsoft (R) Visual C# 2008 Compiler version 3.5.21022.8
for Microsoft (R) .NET Framework version 3.5
Copyright (C) Microsoft Corporation. All rights reserved.

C not defined
undefined local variable or method `say_bye' for main:Object

Hello from runtime #1!
some constant

And if you want app-domain isolation, just do ScriptRuntime.Create(System.AppDomain.CreateDomain("foo")).

That was easy, wasn't it?


-----Original Message-----
From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at rubyforge.org] On Behalf Of John Lam (IRONRUBY)
Sent: Monday, April 28, 2008 7:05 AM
To: ironruby-core at rubyforge.org
Subject: Re: [Ironruby-core] Regarding IronRuby... How true it sounds from this blog

Sanghyeon Seo:

> It seems to be a rather good overview of the status to me. I mostly
> agree, except for the accusation that "Microsoft would never back an
> OSS web framework like Rails in preference to its own".

He also gets a number of important technical details wrong about IronRuby, I'll respond later today.


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