writing dsls in groovy

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 Scott Davis

DSLs in Groovy Say what you mean,

Mean what you say

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Scott Davis

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What is a

Domain SpecificLanguage?

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Domain 

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Language

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DSL:a specific tool for a

specific job

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 SQL 

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<target name="compile"

description="Compiles the Java code"> <mkdir dir="${build.dir}" /> <mkdir dir="${classes.dir}" /> 

<javac srcdir="${source.dir}"destdir="${classes.dir}"

debug="on" deprecation="on"> 

<classpath refid="compile.classpath"/> 

</javac> 

<copy todir="${classes.dir}"> 

<fileset dir="${source.dir}"> <include name="**/*.properties" /> 

<include name="**/*.xml" /> </fileset> 

</copy> </target> 

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Internalor 

External?

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 Simplicity

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* C h

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  * Cornstarch* Corn flour* Corn syrup solids

* Mono and diglycerides* Soy lecithin* Polysorbate 60* Dextrin* Calcium caseinate* Sodium stearol lactylate* Wheat gluten* Calcium sulfate* Natural and artificial flavors* Caramel color* Sorbic acid (to retain freshness)* Artificial color (yellow 5, red 40)

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select * from books;

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What isGroovy?

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Groovy is a DSL for Java

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 A DSL for Installation 

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#!/usr/bin/env groovy

if(args){

def project = args[0]

println "Installing ${project}..."

"cp jboss.tar.gz /install/jboss".execute()println "Finished installing ${project}..."

} else{

println """USAGE: install jboss

[from src/dir] [to dest/dir]"""

}

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 A DSL for Time

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Integer.metaClass.getHour = {->

delegate * 60}

Integer.metaClass.getMinutes = {->

delegate}

println 1.hour + 30.minutes

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 A DSL is a specific tool

Internal or External

To simplify the solution 

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DSLs in Groovy Say what you mean,

Mean what you say

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Scott Davis

Questions?Thanks for your time.

scott@thirstyhead.com

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