DESIGN PATTERNDESIGN PATTERN

Apa itu Design Pattern ??Apa itu Design Pattern ??

• Design pattern adalah solusi yang digunakan untuk menyelesaikan masalah-masalah umum yang ditemukan dalam design perangkat lunak.

• Design pattern berupa template

• Design pattern bukan termasuk algoritma

Jenis-jenis Design PatternJenis-jenis Design Pattern

• Creational Patterns:1. Abstract Factory2. Builder3. Factory Method4. Prototype5. Singleton

Jenis-jenis Design Pattern(cont.)Jenis-jenis Design Pattern(cont.)

• Structural Patterns:1. Adapter2. Bridge3. Composite4. Decorator5. Facade6. Flyweight7. Proxy

Jenis-jenis Design Pattern(cont.)Jenis-jenis Design Pattern(cont.)

• Behavioral Patterns:1. Chain of Responsbility2. Command3. Interpreter4. Iterator5. Mediator6. Mementto7. Observer8. State9. Strategy10. Template Method11. Visitor

Singleton Design PatternSingleton Design Pattern

Singleton artinya satu class hanya boleh mempunyai satu instance selama aplikasi berjalan

Singleton Pattern (problem)Singleton Pattern (problem)

Singleton Pattern(problem)Singleton Pattern(problem)

Singleton PatternSingleton Pattern

Singleton PatternSingleton Pattern

Factory PatternFactory Pattern

When we use it?• When our object or component setup involves

a high level of complexity• When we need to easily generate different

instances of objects depending on the environment we are in

• When we're working with many small objects or components that share the same properties

• When composing objects with instances of other objects that need only satisfy an API contract (aka, duck typing) to work. This is useful for decoupling.

Factory PatternFactory Pattern

Factory PatternFactory Pattern

Problem

Factory PatternFactory Pattern

Solution

Facade PatternFacade Pattern

Adalah objek yang menyediakan interface yang telah sederhana dari deretan kode yang sangat besar

Facade Pattern (Problem)Facade Pattern (Problem)

Facade PatternFacade Pattern

Adapter Design PatternAdapter Design Pattern

Intinya menyederhanakan interface

Adapter Pattern (problem)Adapter Pattern (problem)

postToWall

Adapter PatternAdapter Pattern

Adapter PatternAdapter Pattern

Observer PatternObserver Pattern

Konsep Utama dari Obserever Pattern adalah saat terdapat kelas tertentu (Observer) yang perlu mengetahui aktifitas dari kelas lain (Subject)

Observer PatternObserver Pattern

Observer

Command PatternCommand Pattern

Subject

Observer PatternObserver Pattern

client

Command PatternCommand Pattern

Intent• Encapsulate a request in an object• Allows the parameterization of clients with

different requests• Allows saving the requests in a queue

Command PatternCommand Pattern

Implementation

Command PatternCommand Pattern