Design Patterns em Scala: Facade

Facade:Facade.scalapackage scala.structural// Facilita o uso de um sistema unificando o comportamento de diversos objetos// Concrete Implementationtrait SubSystemA { def methodA1() def methodA2()}trait SubSystemB { def methodB()}class ConcreteSubSystemA extends SubSystemA { override def methodA1() {  println("System A") } override def methodA2() {  println("System A") }}class ConcreteSubSystemB extends SubSystemB { override def methodB() {  println("System B") }}class Facade extends SubSystemA with SubSystemB { val subsystemA = new ConcreteSubSystemA() val subsystemB = new ConcreteSubSystemB() override def methodA1() {  subsystemA.methodA1() } override def methodA2() {  subsystemA.methodA2() } override def methodB() {  subsystemB.methodB() }}// Clientobject FacadeClient extends Application { var facade = new Facade() facade.methodA1() facade.methodA2() facade.methodB()}