Rejectkaigi 2010

Sunday, August 29, 2010

Mirah/Dubious John Woodell Takeru Sasaki RejectKaigi 2010 2 Sunday, August 29, 2010

Thank you for using "AppEngine/JRuby” "AppEngine/JRuby" 3 Sunday, August 29, 2010

Spin-up? Yes, this is a problem... 4 Sunday, August 29, 2010

...but now you can use Mirah and Dubious "Mirah/Dubious" 5 Sunday, August 29, 2010

Mirah is a staticly typed language, that uses type-inference Mirah Ruby JVM 6 Sunday, August 29, 2010

Now, how does it work? (minus a few boring details) 7 Sunday, August 29, 2010

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) 8 Sunday, August 29, 2010

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 } Sunday, August 29, 2010

"Pure JVM bytecode" We don't need a Runtime. This is very, very fast! bytecode JRuby Runtime 10 Sunday, August 29, 2010

Dubious is Web framework for Mirah Dubious Mirah Web *du bi ous[ djbis | dj- ] [ ] [1] (( )) … ((of, about, as to ...)). [2] > 11 Sunday, August 29, 2010

Write Rails-style code, it runs on Google App Engine GoogleAppEngine Rails 12 Sunday, August 29, 2010

Here’s code from Dubious, this is not Rails! Rails Dubious 13 Sunday, August 29, 2010

Dubious controllers will be familiar Sunday, August 29, 2010

Mirah can use ERb templates Sunday, August 29, 2010

The models are simple (no schema) Sunday, August 29, 2010

It really works, and spins-up in ~1sec Spinup. 17 Sunday, August 29, 2010

It isn’t "Dubious" Thank you! http://mirah.org http://dubious-demo.appspot.com @johnwoodell & @urekat 18 Sunday, August 29, 2010

Sunday, August 29, 2010

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Rejectkaigi 2010

by John Woodell

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