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You're reading from Mastering Java EE Development with WildFly Create Enterprise-grade Java applications with WildFly

Product type Paperback

Published in Jun 2017

Publisher Packt

ISBN-13 9781787287174

Length 468 pages

Edition 1st Edition

Languages

Java

Tools

Java EE

Concepts

Application Development

Author (1):

Luca Stancapiano

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Table of Contents (20) Chapters

Preface

1. Introducing Java EE and Configuring the Development Environment

2. Working with Dependency Injection FREE CHAPTER

3. Persistence

4. Implementing Business Logic

5. Working with Distributed Transactions

6. Creating REST Services

7. Implementing WebSockets

8. Working with Messaging

9. Implementing a Mail Client

10. Asynchronous REST

11. Asynchronous EJB

12. Batches and Workflows

13. Working with Servlets and JSP

14. Writing a JSF Application

15. Sharing the Web Sessions

16. WildFly in Cloud

17. Share your Data

18. Deployment

19. Working with OSGi

Singleton HA Services

In the earlier chapters, such as Chapter 2, Working with Dependency Injection, and Chapter 4, Implementing Business Logic, we have seen Singleton and how to use it within a Java virtual machine.
WildFly is able to use the Singleton mechanism even among several nodes of a cluster. WildFly can instantiate Singleton on a node and ensure that it is used within all nodes of the same cluster. This mechanism is called HA Singleton.

Since HA Singleton is physically instantiated on a single node, operations are performed exclusively on that node. If the cluster node breaks or stops, WildFly plans to move Singleton to a nearby node, thereby ensuring high availability of the service.

Infinispan allows Singleton to be replicated on the different nodes of the Cluster and guarantees some transparency to the clients that use it. The client, which can be an EJB, a Servlet...

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Authors (1)

Stancapiano

Luca Stancapiano has been working in the IT industry since 2000. He specializes in Java EE and JBoss, and has collaborated with Apache, Alfresco, Atliassian, EXo, and JBoss communities on several open source products for many years. He lives in Italy and collaborates with leading consulting companies for design and implementation of applications for both government and private companies dealing with information, finance, and transport. Abroad, he is known for his interventions at the Daily Telegraph in portals. He brings projects such as Wildfly, Alfresco ECM, Activiti, JGroups, Arquillian, Exo Portal, Solr, Infinispan, JBoss Portal ,Gatein, Jira, and Confluence, and manages Vige, an open source community specializing in open government and smart cities. He is one of the authors of the Gatein Cookbook, showing Gatein's portal and how to develop portlets with it, published in 2012 by Packt.

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