benchmark closure

benchmark.groovy

def benchmark = { closure ->  
  start = System.currentTimeMillis()  
  closure.call()  
  now = System.currentTimeMillis()  
  now - start  
}  

def originalTime = benchmark {
  productList.each { productId -> 
    def param = [productId]
    sql.execute('''some sql where product_id = ?''', param)
  }
}