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---
layout: pattern
title: Object Pool
folder: object-pool
permalink: /patterns/object-pool/
categories: creational
tags: pattern_tag
---
**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.
![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)