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Added Object Pool description to README.md.

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Ilkka Seppälä
2015-05-24 22:39:33 +03:00
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@@ -25,6 +25,7 @@ Creational design patterns abstract the instantiation process. They help make a
* [Property](#property) * [Property](#property)
* [Singleton](#singleton) * [Singleton](#singleton)
* [Multiton](#multiton) * [Multiton](#multiton)
* [Object Pool](#object-pool)
### Structural Patterns ### Structural Patterns
@@ -619,6 +620,15 @@ validation and for building to order
**Applicability:** Use the Private Class Data pattern when **Applicability:** Use the Private Class Data pattern when
* You want to prevent write access to class data members * You want to prevent write access to class data members
## <a name="object-pool">Object Pool</a> [&#8593;](#list-of-design-patterns)
**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](https://github.com/iluwatar/java-design-patterns/blob/master/object-pool/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)
# Frequently asked questions # Frequently asked questions