loggingAround.groovy

@Grab('org.slf4j:slf4j-api:1.6.1')
@Grab('ch.qos.logback:logback-classic:0.9.28')
import org.slf4j.*
import groovy.transform.*

trait Loggable {
    @Memoized getLog() {
        LoggerFactory.getLogger( this.getClass() )
    }
}

class Test implements Loggable {
    def foo() {
        log.debug( 'Woo.  In foo' )
    }
}

class Test2 implements Loggable {
    def bar() {
        log.info( 'Ha.  In bar' )
    }
}

new Test().foo()

new Test2().bar()

messingAround.groovy

import groovy.transform.*

@CompileStatic
trait IgnoredRemovable {
    void remove() {}
}

@CompileStatic
trait Endless {
    boolean hasNext() { true }
}

@CompileStatic
trait EndlessIterator<T> implements IgnoredRemovable, Endless, Iterator<T> {
    T value
    T next() { value }
}

@CompileStatic
class LoadsOfOnes implements EndlessIterator<Integer> {
    LoadsOfOnes() {
        value = 1
    }
}

assert new LoadsOfOnes().take( 5 ).collect() == [ 1, 1, 1, 1, 1 ]