In Javascript, we map directly to JS functions with the same name.

For the following Polygene composite type,

package org.apache.polygene.library.scripting;
  [...snip...]


@Mixins(ScriptMixin.class)
public interface HelloSpeaker
{
    String sayHello();
}

we need a implementation in a resource file (visible on classpath) named org/apache/polygene/library/scripting/HelloSpeaker.js that looks like this;

function sayHello() {
    return "Hello, JavaScript";
}

The Groovy Scripting Library is a Generic mixin that implements interfaces by delegating to Groovy code from classpath resources.

But before looking at how to use the Scripting library we’ll see that you don’t need Scripting library at all if you simply need to use Groovy classes as Fragments. Groovy is a fully Java compatible language and can be used directly, similarly to Scala.

Then we’ll see how to use Groovy class scripts and method scripts.

All examples below are based on this type:

package org.apache.polygene.library.scripting;
  [...snip...]


@Mixins(ScriptMixin.class)
public interface HelloSpeaker
{
    String sayHello();
}

To directly use compiled Groovy classes as Fragments you don’t need this library at all.

Having this Groovy class compiled ;

HelloSpeakerMixin.groovy. 

class HelloSpeakerMixin
    implements HelloSpeaker
{

    String sayHello() {
        "Hello there, Groovy"
    }
}

assemble it directly:

SingletonAssembler assembler = new SingletonAssembler(
    assembly -> assembly.transients( HelloSpeaker.class )
                        .withMixins( HelloSpeakerMixin.class )
);
HelloSpeaker speaker = assembler.module().newTransient( HelloSpeaker.class );
assertThat( speaker.sayHello(), equalTo("Hello there, Groovy") );

Declare a Groovy function in a resource file located in the same package as the implemented type with the name <type>.groovy:

HelloSpeaker.groovy. 

def sayHello() {
    "Hello, Groovy"
}

Then assemble it with the normal ScriptMixin:

SingletonAssembler assembler = new SingletonAssembler(
    assembly -> assembly.values( HelloSpeaker.class )
                        .setMetaInfo( Scripting.GROOVY )
                        .withMixins( ScriptMixin.class )
);
HelloSpeaker speaker = assembler.module().newValue( HelloSpeaker.class );
assertThat( speaker.sayHello(), equalTo("Hello, Groovy") );