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Scala Design Patterns

You're reading from   Scala Design Patterns Write efficient, clean, and reusable code with Scala

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Product type Paperback
Published in Feb 2016
Publisher
ISBN-13 9781785882500
Length 382 pages
Edition 1st Edition
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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 FREE CHAPTER 2. Traits and Mixin Compositions 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 1 9. Behavioral Design Patterns – Part 2 10. Functional Design Patterns – The Deep Theory 11. Functional Design Patterns – Applying What We Learned 12. Real-Life Applications Index

The adapter design pattern


In many cases, we have to make applications work by combining different components together. However, quite often, we have a problem where the component interfaces are incompatible with each other. Similarly with using public or any libraries, which we cannot modify ourselves—it is quite rare that someone else's views will be exactly the same as ours in our current settings. This is where adapters help. Their purpose is to help incompatible interfaces work together without modifying their source code.

We will be showing how adapters work using a class diagram and an example in the next few subsections.

Class diagram

For the adapter class diagram, let's imagine that we want to switch to using a new logging library in our application. The library we are trying to use has a log method that takes the message and the severity of the log. However, throughout our whole application, we expect to have the info, debug, warning and error methods that only take the message and...

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