Book Image

WildFly Configuration, Deployment, and Administration

By : Francesco Marchioni, Christopher Adam M Ritchie
Book Image

WildFly Configuration, Deployment, and Administration

By: Francesco Marchioni, Christopher Adam M Ritchie

Overview of this book

Table of Contents (19 chapters)
WildFly Configuration, Deployment, and Administration Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Clustering entities


As entities sit deep in the backend, they do not need to be considered with regard to load-balancing logic or session replication. However, it is useful to cache your entities to avoid roundtrips to the database. The EJB3 persistence layer implementation in WildFly is Hibernate 4.3.5. The Hibernate framework includes a complex cache mechanism, which is implemented both at the Session level and at the SessionFactory level.

The cache used in the Session level is called the first-level cache and only has session scope. This cache is cleared as soon as the Hibernate session using it is closed. Hibernate uses second-level caching to store entities or collections retrieved from the database. It can also store the results of recent queries. It is the second-level cache that we need to cluster, as this cache is used across sessions.

Enabling the second-level cache for your enterprise applications is relatively straightforward. If you are using JPA, then all you need to do to enable...