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Leader follower #279

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Leader Follower initial commit
amit2103 Oct 29, 2015
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amit2103 Oct 30, 2015
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Refactoring changes
amit2103 Oct 30, 2015
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Refactoring changes
amit2103 Oct 30, 2015
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amit2103 committed Oct 30, 2015
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25 changes: 9 additions & 16 deletions leader-follower/index.md
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---
layout: pattern
title: Tolerant Reader
folder: tolerant-reader
permalink: /patterns/tolerant-reader/
categories: Integration
title: Leader Follower
folder: leader-follower
permalink: /patterns/leader-follower/
categories: Concurrency
tags: Java
---

**Intent:** Tolerant Reader is an integration pattern that helps creating
robust communication systems. The idea is to be as tolerant as possible when
reading data from another service. This way, when the communication schema
changes, the readers must not break.
**Intent:** Leader Follower is a concurrency pattern where multiple threads can efficiently demultiplex
events and dispatch to event handlers.
![alt text](./etc/LeaderFollower.png "Leader Follower")

![alt text](./etc/tolerant-reader.png "Tolerant Reader")
**Applicability:** Use the Leader Follower pattern when

**Applicability:** Use the Tolerant Reader pattern when

* the communication schema can evolve and change and yet the receiving side should not break

**Credits:**

* [Martin Fowler - Tolerant Reader](http://martinfowler.com/bliki/TolerantReader.html)
* multiple threads can receive events , process reponses and demutiplex connection using a shared HandleSet.