StopWatch.groovy

class StopWatch {
    private timeRecoreds = [:].withDefault { 0.0 }

    def withTimeRecording(keyword, clos) {
        def beginTime = System.currentTimeMillis()
        try {
            return clos.call()
        } finally {
            timeRecoreds[keyword] += System.currentTimeMillis() - beginTime
        }
    }

    def printResult() {
        timeRecoreds.each { keyword, time ->
            println "timeResult: ${keyword}: ${time / 1000.0} (sec)"
        }
    }
}

usage.groovy

def watch = new StopWatch()
watch.withTimeRecording("total") {
    999.times { index ->
        watch.withTimeRecording("A") {
            // do something A
            sleep 1
        }
        watch.withTimeRecording("B") {
            // do something B
            sleep 2
        }
    }
}
watch.printResult()

// timeResult: A: 1.312 (sec)
// timeResult: B: 2.398 (sec)
// timeResult: total: 3.877 (sec)

thanks!