An example of using interfaces with flexible closures

StrategyRunner.groovy

class StrategyRunner {
	
Map strategyMap = [:]

interface IStrategy {
	boolean apply(arg)
};

def addStrategy(String name, Closure cl) {
	strategyMap[name] = cl as IStrategy
}

def init() {
	addStrategy("s1", this.&s1_apply)
	addStrategy("s2", { println "strategy2, ignore arg"; false})
}

def s1_apply(arg) {
	println "your arg was: ${arg}"
	return true
}

def go() {
	strategyMap.each { 
		it.value.apply('arg')
	}
}


static void main(args) {
	println "in main..."
	StrategyRunner runner = new StrategyRunner()
	runner.init()
	runner.go()
}

}