함수형프로그래밍에서 템플릿메소드

Customer.groovy

package templates;

abstract class Customer {
    def plan
    
    def Customer() {
        plan = []
    }
    
    def abstract checkCredit()
    def abstract checkInventory()
    def abstract ship()
    
    def process() {
        checkCredit()
        checkInventory()
        ship()
    }
}

---

package templates;

class CustomerBlocks {
    def plan, checkCredit, checkInventory, ship
    
    def CustomerBlocks() {
        plan = []
    }
    
    def process() {
        checkCredit()
        checkInventory()
        ship()
    }
}

----

package templates;

class CustomerBlocksWithProtection {
    def plan, checkCredit, checkInventory, ship
    
    def CustomerBlocksWithProtection() {
        plan = []
    }
// BEGIN groovy_customer_blocks    
def process() {
  checkCredit?.call()
  checkInventory?.call()        
  ship?.call()
}
// END groovy_customer_blocks    
}