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)

Cache metrics


It is important to be able to monitor the cache utilization of your application. You can collect cache metrics for further analysis. The Hibernate second-level cache API provides ways to obtain cache utilization data.

By collecting cache metrics, you can find out how many entities are put in cache regions, and how many cache hits and misses occurred. Furthermore, you can browse the content of cached data.

However, first you have to enable the generation of statistics in Hibernate and also make the cache content human readable. To do this, you would need to add the following two lines to your Hibernate configuration:

<property name="hibernate.generate_statistics">true</property>
<property name="hibernate.cache.use_structured_entries">
  true
</property>

The first line ensures that cache statistics are collected. (It also forces Hibernate to collect other statistics; we will return to this in Chapter 7, Metrics and Statistics, when we discuss metrics and statistics...