mirror of
https://github.com/tiennm99/java-design-patterns.git
synced 2026-05-17 12:59:54 +00:00
Ilkka Seppälä
4108f86177
* Changed database implementation. Removed static objects. * Fix Logs * Fix 40 errors from checkstyle plugin run. 139 left)) * Fix CacheStore errors from checkstyle plugin 107 left * Fix last errors in checkstyle. * Fix sonar issues * Fix issues in VALIDATE phase * Fix Bug with mongo connection. Used "Try with resources" * Add test * Added docker-compose for mongo db. MongoDb db work fixed. * Provided missing tests * Comments to start Application with mongo. * Fix some broken links * Remove extra space * Update filename * Fix some links in localization folders * Fix link * Update frontmatters * Work on patterns index page * Work on index page * Fixes according PR comments. Mainly Readme edits. * fix frontmatter * add missing png * Update pattern index.md * Add index.md for Chinese translation * update image paths * update circuit breaker image paths * Update image paths for localizations * add generated puml * Add missing image * Update img file extensions * Update the rest of the EN and ZH patterns to conform with the new website Co-authored-by: Victor Zalevskii <zvictormail@gmail.com>
34 lines
831 B
Markdown
34 lines
831 B
Markdown
---
|
|
title: MonoState
|
|
category: Creational
|
|
language: en
|
|
tags:
|
|
- Instantiation
|
|
---
|
|
|
|
## Also known as
|
|
Borg
|
|
|
|
## Intent
|
|
Enforces a behaviour like sharing the same state amongst all instances.
|
|
|
|
## Class diagram
|
|
|
|
|
|
## Applicability
|
|
Use the Monostate pattern when
|
|
|
|
* The same state must be shared across all instances of a class.
|
|
* Typically this pattern might be used everywhere a Singleton might be used. Singleton usage however is not transparent, Monostate usage is.
|
|
* Monostate has one major advantage over singleton. The subclasses might decorate the shared state as they wish and hence can provide dynamically different behaviour than the base class.
|
|
|
|
## Typical Use Case
|
|
|
|
* The logging class
|
|
* Managing a connection to a database
|
|
* File manager
|
|
|
|
## Real world examples
|
|
|
|
Yet to see this.
|