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Design Patterns and Best Practices in Java

You're reading from   Design Patterns and Best Practices in Java A comprehensive guide to building smart and reusable code in Java

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Product type Paperback
Published in Jun 2018
Publisher Packt
ISBN-13 9781786463593
Length 280 pages
Edition 1st Edition
Languages
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Authors (4):
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 Singh Singh
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Singh
 Puri Puri
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Puri
 Ianculescu Ianculescu
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Ianculescu
 Torje Torje
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Torje
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Toc

Table of Contents (15) Chapters Close

Title Page
Packt Upsell
Contributors
Preface
1. From Object-Oriented to Functional Programming FREE CHAPTER 2. Creational Patterns 3. Behavioral Patterns 4. Structural Patterns 5. Functional Patterns 6. Let's Get Reactive 7. Reactive Design Patterns 8. Trends in Application Architecture 9. Best Practices in Java 1. Other Books You May Enjoy Index

Flyweight pattern


Creating objects costs time and resources. The best examples are Java constant string creation, Boolean.valueOf(boolean b), or Character valueOf(char c), since they never create instances; they return immutable cached instances. To speed up (and keep the memory footprint low), applications use object pools. The difference between the object pool pattern and the flyweight pattern is that the first (creation pattern) is a container that keeps mutable domain objects, while the flyweight (structure pattern) is an immutable domain object. Since they're immutable, their internal state is set on creation, and the extrinsic state is given from outside on each method call.

Most web applications use connection pools—a database connection is created/obtained, used, and sent back to the pool. Since this pattern is so common, it has a name: Connection Flyweight (see http://wiki.c2.com/?ConnectionFlyweight). Other resources, such as sockets or threads (thread pool pattern), also make...

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