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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

Product type Paperback

Published in Apr 2018

Publisher Packt

ISBN-13 9781788471305

Length 396 pages

Edition 2nd Edition

Languages

Scala

Concepts

Design Patterns

Author (1):

Nikolov

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Table of Contents (19) Chapters

Title Page

Copyright and Credits

Packt Upsell

Contributors

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 One

9. Behavioral Design Patterns – Part Two

10. Functional Design Patterns – the Deep Theory

11. Applying What We Have Learned

12. Real-Life Applications

1. Other Books You May Enjoy

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Index

The memento design pattern

Depending on the software we are writing, we might have a requirement to be able to restore the state of an object back to its previous state.

Note

The purpose of the memento design pattern is to provide the ability to execute an undo action in order to restore an object to a previous state.

The original memento design pattern is implemented with the help of three main objects:

Originator: The object whose state we want to be able to restore
Caretaker: The object that triggers the changes to the originator object and uses the memento objects for rollback, if needed
Memento: The object that carries the actual state of the originator and can be used to restore to one of the previous states

It is important to know that the memento object can be handled only by the originator. The caretaker and all other classes can just store it and nothing else.

Example class diagram

A classic example of the memento design pattern that comes to mind is text editors. We can always undo whatever...

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Authors (1)

Nikolov

Nikolov

Ivan Nikolov is a technical architect based in London. He works in the ad tech industry and uses Scala in combination with libraries and technologies such as Spark, Hadoop, RabbitMQ, Kafka, SQL and NoSQL stores, and Akka. He also uses other JVM and scripting languages. Some of the projects Ivan has worked on include a large-scale real-time machine learning platform, batch processing solutions, and high load APIs. Ivan also likes getting involved with open source projects, whether it be to contribute or get inspiration and good ideas.

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