java-design-patterns/object-pool/README.md

---
layout: pattern
title: Object Pool
folder: object-pool
permalink: /patterns/object-pool/
categories: Creational
tags:
 - Game programming
 - Performance
---

## Intent
When objects are expensive to create and they are needed only for
short periods of time it is advantageous to utilize the Object Pool pattern.
The Object Pool provides a cache for instantiated objects tracking which ones
are in use and which are available.

## Class diagram
![alt text](./etc/object-pool.png "Object Pool")

## Applicability
Use the Object Pool pattern when

* The objects are expensive to create (allocation cost)
* You need a large number of short-lived objects (memory fragmentation)
Work towards #56: Splitting up the README I did the job and splitted up the readme, hopefully everything was splitted correctly... 2015-08-13 23:54:40 +02:00			`---`
			`layout: pattern`
			`title: Object Pool`
			`folder: object-pool`
Work towards #56: Add permalink to every pattern This makes cleaner URLs thanks to jekyll 2015-08-15 18:03:05 +02:00			`permalink: /patterns/object-pool/`
Work on #213 - properly categorize all patterns - remove pattern list from readme - minor fixes to readme - removed "introduction" because its not a pattern and an error i committed some time ago 2015-08-20 21:40:07 +02:00			`categories: Creational`
Categorize and tag all patterns #213 2015-12-28 15:52:44 +02:00			`tags:`
https://github.com/iluwatar/java-design-patterns-web/issues/8 Update pattern categories and tags 2019-12-13 21:09:28 +02:00			`- Game programming`
Add performance tag to relevant patterns #213 2015-12-28 16:07:43 +02:00			`- Performance`
Work towards #56: Splitting up the README I did the job and splitted up the readme, hopefully everything was splitted correctly... 2015-08-13 23:54:40 +02:00			`---`

Use headings instead of bold text in index.md #238 2016-01-03 21:14:30 +01:00			`## Intent`
			`When objects are expensive to create and they are needed only for`
Work towards #56: Splitting up the README I did the job and splitted up the readme, hopefully everything was splitted correctly... 2015-08-13 23:54:40 +02:00			`short periods of time it is advantageous to utilize the Object Pool pattern.`
			`The Object Pool provides a cache for instantiated objects tracking which ones`
			`are in use and which are available.`

#1113 Link uml-reverse-mapper created class diagrams to readme, where needed 2019-12-07 20:01:13 +02:00			`## Class diagram`
Work towards #56: Splitting up the README I did the job and splitted up the readme, hopefully everything was splitted correctly... 2015-08-13 23:54:40 +02:00			`![alt text](./etc/object-pool.png "Object Pool")`

Use headings instead of bold text in index.md #238 2016-01-03 21:14:30 +01:00			`## Applicability`
			`Use the Object Pool pattern when`
Work towards #56: Splitting up the README I did the job and splitted up the readme, hopefully everything was splitted correctly... 2015-08-13 23:54:40 +02:00
https://github.com/iluwatar/java-design-patterns-web/issues/8 Update pattern categories and tags 2019-12-13 21:09:28 +02:00			`* The objects are expensive to create (allocation cost)`
			`* You need a large number of short-lived objects (memory fragmentation)`