Book Image

Mastering Hibernate

By : Ramin Rad, Koushik Srinivas Kothagal
Book Image

Mastering Hibernate

By: Ramin Rad, Koushik Srinivas Kothagal

Overview of this book

Hibernate has been so successful since its inception that it even influenced the Java Enterprise Edition specification in that the Java Persistence API was dramatically changed to do it the Hibernate way. Hibernate is the tool that solves the complex problem of Object Relational Mapping. It can be used in both Java Enterprise applications as well as .Net applications. Additionally, it can be used for both SQL and NoSQL data stores. Some developers learn the basics of Hibernate and hit the ground quickly. But when demands go beyond the basics, they take a reactive approach instead of learning the fundamentals and core concepts. However, the secret to success for any good developer is knowing and understanding the tools at your disposal. It’s time to learn about your tool to use it better This book first explores the internals of Hibernate by discussing what occurs inside a Hibernate session and how Entities are managed. Then, we cover core topics such as mapping, querying, caching, and we demonstrate how to use a wide range of very useful annotations. Additionally, you will learn how to create event listeners or interceptors utilizing the improved architecture in the latest version of Hibernate.
Table of Contents (16 chapters)

Caching strategies

One of the most important features of a relational database is support for concurrency and how multiple users can read from and write to the database. This is known as isolation level. The same concept is applicable in ORM cache.

Hibernate has built-in support for various concurrency strategies and isolation levels for a second-level cache. In this section, we will discuss various strategies and when you should use one over the other.

You should keep in mind that Hibernate defines its own isolation level, but a cache provider may offer other levels. When you choose a provider, you should consult the documentation to find out what isolation levels are supported. For example, Ehcache only supports READ-COMMITTED. However, Ehcache can in fact participate in JTA transaction (global transaction) and, therefore, supports two-phase commit.

Hibernate provides an interface to access strategy for different types, such as EntityRegionAccessStrategy, which specifies the contract to access...