Hibernate in memory data + database

Question

I have an application which already written in Hibernate and is mapped to hiberante database annotations (and in the background I am using Postgres as DB). I was wondering if there is a way to keep the database as is, but to add another level of "database" which holds everything In-Memory in java object?

What I mean is, 1) keep Postgres update when there is update/delete/create and only return after it is really commited.

2) when some DB Read queries executed, I want to be able to return the answer using my java object And avoid calling the database for those Read operations

Possible duplicate of When and how to use hibernate second level cache? it's called a second level cache and this thread should answer all your questions. — Robert Moskal
– Robert Moskal, Commented Jun 4, 2016 at 20:58

Matthew Fontana · Accepted Answer · 2016-06-05 11:57:39Z

1

Hibernate has an awesome feature built in called a second level cache. This will allow you to "plugin" a caching system like ehcache to offload a lot of the database read load. Ehcache can either be used standalone or in a distributed manor. Ehcache on its own is a very powerful tool that you can also leverage in front of webservice calls and other lookups as well. I will post a few decent reading links for you.

http://howtodoinjava.com/hibernate/hibernate-ehcache-configuration-tutorial/

http://www.mkyong.com/ehcache/ehcache-hello-world-example/

You can also consider using spring with ehcache for a more declarative caching style if you want to use it standalone

http://www.mkyong.com/spring/spring-caching-and-ehcache-example/

answered Jun 5, 2016 at 11:57

Matthew Fontana

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