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Scala Design Patterns

You're reading from   Scala Design Patterns Design modular, clean, and scalable applications by applying proven design patterns in Scala

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Product type Paperback
Published in Apr 2018
Publisher Packt
ISBN-13 9781788471305
Length 396 pages
Edition 2nd Edition
Languages
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Author (1):
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Ivan Nikolov Ivan Nikolov
Author Profile Icon Ivan Nikolov
Ivan Nikolov
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Table of Contents (14) Chapters Close

Preface 1. The Design Patterns Out There and Setting Up Your Environment 2. Traits and Mixin Compositions FREE CHAPTER 3. Unification 4. Abstract and Self Types 5. Aspect-Oriented Programming and Components 6. Creational Design Patterns 7. Structural Design Patterns 8. Behavioral Design Patterns – Part One 9. Behavioral Design Patterns – Part Two 10. Functional Design Patterns – the Deep Theory 11. Applying What We Have Learned 12. Real-Life Applications 13. Other Books You May Enjoy

The factory method design pattern

The factory method design pattern exists in order to encapsulate an actual class instantiation. It simply provides an interface to create an object, and then the subclasses of the factory decide which concrete class to instantiate. This design pattern could become useful in cases where we want to create different objects during the runtime of the application. This design pattern is also helpful when object creation would otherwise require extra parameters to be passed by the developer.

Everything will become clearer with an example, and we will provide one in the following subsections.

An example class diagram

For the factory method, we will be showing an example with databases. To keep things...

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