How I Learned To Apply Design Patterns
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![How I Learned To Apply Design Patterns,[object Object],Andy Maleh,[object Object],Obtiva Corp.,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-1-2048.jpg?cb=1668038141)
![Outline,[object Object],What Are Design Patterns?,[object Object],Gang of Four Design Patterns,[object Object],GRASP Patterns,[object Object],Learning Process,[object Object],Example,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-2-2048.jpg?cb=1668038141)
![What Are Design Patterns?,[object Object],Reusable solutions to common problems encountered at the software design level of abstraction.,[object Object],A pattern usually consists of:,[object Object],Name,[object Object],Problem,[object Object],Solution,[object Object],Consequences,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-3-2048.jpg?cb=1668038141)
![Gang of Four Design Patterns,[object Object],Strategy,[object Object],State,[object Object],Decorator,[object Object],Proxy,[object Object],Abstract Factory,[object Object],Factory Method,[object Object],Chain of Responsibility,[object Object],Visitor???,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-4-2048.jpg?cb=1668038141)
![GRASP Patterns,[object Object],General Responsibility Assignment Software Patterns,[object Object],Appeared in the book "Applying UML and Patterns" by Craig Larman,[object Object],Provide the underpinnings of Object Oriented Design,[object Object],Help explain the benefits of most Gang of Four design patterns as well as how they were arrived to ,[object Object],Contemplated collectively instead of one at a time,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-5-2048.jpg?cb=1668038141)
![GRASP Patterns,[object Object],Creator,[object Object],Information Expert,[object Object],Controller,[object Object],Low Coupling,[object Object],High Cohesion,[object Object],Polymorphism,[object Object],Pure Fabrication,[object Object],Indirection,[object Object],Protected Variations,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-6-2048.jpg?cb=1668038141)
![Responsibility Driven Design,[object Object],Break requirements into use-cases,[object Object],Come up with scenarios for use-cases,[object Object],Figure out responsibilities for each step in a scenario,[object Object],Assign responsibilities to objects based on Object Oriented Design principles,[object Object],NOTE: the methodology is applied vertically in thin slices when following an Agile process,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-7-2048.jpg?cb=1668038141)
![Learning Process,[object Object],Study design patterns with genuine interest to deeply understand them and recognize when applying them would reap benefits in real-world scenarios.,[object Object],Look for every opportunity to apply them to slowly develop a sense of smell for when patterns can be applied.,[object Object],Learn to recognize when a design pattern is absolutely necessary and helpful and when it is just over-engineering.,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-8-2048.jpg?cb=1668038141)
![Example – Order Submission,[object Object],Requirements:,[object Object],When an order is first created, it is not ready for on-line submission as it is missing required information.,[object Object],An order becomes ready for submission once filled in with required information. ,[object Object],A pending order is an order that was interrupted amidst on-line submission.,[object Object],Once an order is submitted, it cannot be edited and resubmitted.,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-9-2048.jpg?cb=1668038141)
![Example – Order Submission,[object Object],Order State Diagram:,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-10-2048.jpg?cb=1668038141)
![Example – Order Submission,[object Object],Design:,[object Object],Each order state is represented with a state object,[object Object],Not Ready,[object Object],Ready,[object Object],Pending,[object Object],Submitted,[object Object],View observes order to update edit and submit button enablements,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-11-2048.jpg?cb=1668038141)
![Example – Order Submission,[object Object],Design Patterns:,[object Object],State,[object Object],Observer,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-12-2048.jpg?cb=1668038141)
![Example – Order Submission,[object Object],GRASP Patterns:,[object Object],Polymorphism ,[object Object],Order States handling behavior polymorphically,[object Object],Indirection,[object Object],Observers provide indirect coupling to order state,[object Object],Protected Variations ,[object Object],Order is protected from state variations,[object Object],Low Coupling,[object Object],Order has low coupling to behavior variation per state,[object Object],View has low coupling to Order via observers,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-13-2048.jpg?cb=1668038141)
![Example – Order Submission,[object Object],Benefits:,[object Object],Order behavior variation across states is clarified,[object Object],Order behavior is easily maintainable in different classes,[object Object],No complicated if/else conditionals,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-14-2048.jpg?cb=1668038141)
![Review,[object Object],What Are Design Patterns?,[object Object],Gang of Four Design Patterns,[object Object],GRASP Patterns,[object Object],Learning Process,[object Object],Example,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-15-2048.jpg?cb=1668038141)
![???,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-16-2048.jpg?cb=1668038141)
![References,[object Object],Design Patterns: Elements of Reusable Object-Oriented Software,[object Object],Authors: Gang of Four,[object Object],ISBN-13: 978-0201633610,[object Object],Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and Iterative Development,[object Object],Author: Craig Larman,[object Object],ISBN-13: 978-0131489066,[object Object],Recommended Chapters (17, 25, 26),[object Object],Object Design: Roles, Responsibilities, and Collaborations,[object Object],Author: Rebecca Wirfs-Brock,[object Object],ISBN-13: 978-0201379433,[object Object],Elephant Carpaccio,[object Object],Author: Alistair Cockburn,[object Object],URL: http://alistair.cockburn.us/Elephant+carpaccio#discussion,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-17-2048.jpg?cb=1668038141)
![Contact,[object Object],Presenter: Andy Maleh,[object Object],Email: andy at obtiva dot com,[object Object],Twitter: AndyMaleh,[object Object],Blog: http://andymaleh.blogspot.com,[object Object]](https://image.slidesharecdn.com/howilearnedtoapplydesignpatterns-110104143449-phpapp01/75/how-i-learned-to-apply-design-patterns-18-2048.jpg?cb=1668038141)
How I Learned To Apply Design Patterns
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A presentation on how I learned to apply design patterns in software development and the additional principles/guidelines that helped along the way.
![[2023] Putting the R! in R&D.pdf](https://cdn.slidesharecdn.com/ss_thumbnails/2023puttingtherinrd-231122234738-294b2909-thumbnail.jpg?width=768&fit=bounds)