Introduction to Mirah and Dubious - Static Ruby for the JVM and Google App Engine

Mirah/Dubious

John Woodell
Takeru Sasaki

RejectKaigi 2010

2

Sunday, August 29, 2010

Thank you for using
"AppEngine/JRuby”
"AppEngine/JRuby"

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Spin-up?
Yes, this is a problem...

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...but now you can use
Mirah and Dubious

"Mirah/Dubious"

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Mirah is a
staticly typed language,
that uses type-inference

Mirah Ruby JVM

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Now, how does it work?
(minus a few boring details)

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First, JRuby’s Parcer creates AST
JRuby AST

mirahp -e "puts 'RubyKaigi'+(167*12+6)"
Script
Body
Call(println)
Call(out)
Constant(System)
Call(+)
String("RubyKaigi")
Call(+)
Call(*)
Fixnum(167)
Fixnum(12)
Fixnum(6)
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Then, the AST becomes JVM bytecode
AST bytecode

mirah -e "puts 'RubyKaigi'+(167*12+6)"; javap -c DashE
RubyKaigi2010
Compiled from DashE
public class DashE extends java.lang.Object{
public static void main(java.lang.String[]);
Code:
0: getstatic #12; //Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #14; //String RubyKaigi
5: sipush 167
8: bipush 12
10: imul
11: bipush 6
13: iadd
14: invokestatic #20; //Method java/lang/String.valueOf:(I)Ljava/lang/
String;
17: invokevirtual #24; //Method java/lang/String.concat:(Ljava/lang/
String;)Ljava/lang/String;
20: invokevirtual #30; //Method java/io/PrintStream.println:(Ljava/lang/
String;)V
23: return

public DashE();
Code:
0: aload_0
1: invokespecial #36; //Method java/lang/Object."<init>":()V
4: return
9 }


"Pure JVM bytecode"
We don't need a Runtime.
This is very, very fast!

bytecode
JRuby Runtime

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Dubious is Web framework for Mirah
Dubious Mirah Web

*du bi ous[ djbis | dj- ] [ ]
[1] (( )) …
((of, about, as to ...)).
[2]

>
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Write Rails-style code,
it runs on Google App Engine

GoogleAppEngine
Rails

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Here’s code from Dubious,
this is not Rails!

Rails
Dubious

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Dubious controllers will be familiar


Mirah can use ERb templates


The models are simple (no schema)


It really works,
and spins-up in ~1sec

Spinup.

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It isn’t "Dubious"

Thank you!

http://mirah.org
http://dubious-demo.appspot.com
@johnwoodell & @urekat
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Introduction to Mirah and Dubious - Static Ruby for the JVM and Google App Engine

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