JPA in the Clouds

A big part of  my current company work is related to managing infrastructure hosted in cloud computing environments.I have recently released an open source project ( Rain Toolkit ) to help ease the management of Amazon EC2 objects. It is a set of command-line tools for performing day-to-day administration tasks. Since Rain Toolkit deals with the management of EC2 resources, it seemed only natural that it should store its data on Amazon SimpleDB. SimpleDB offers a rest-based API that I planned to use, but then I came accross simplejpa . Simplejpa is a JPA implementation on top of Amazon Simple DB. It allows you to leverage your existing JPA experience and code when developing against SimpleDB.It support many JPA features (@ManyToOne, @OneToMany, lazy loading , @Lob, etc.). It was a simple matter to integrate simplejpa into Rain Toolkit and it certainly saved me a lot of time in coding the SimpleDB access layer. What is interesting is that Google Appengine, the other leading cloud infrastructure platform, also supports Simple JPA for storage (see http://code.google.com/appengine/docs/java/datastore/usingjpa.html ). I have  used AppEngine in other projects and its JPA layer works most of the time just as a J2EE developer would expect. Like Amazon SimpleDB, AppEngine storage ( based on Google's BigTable) is a non-relational data storage system. JPA is flexible enough to provide an abstraction later for the leading c...

Date: March, 16 2010
Url: http://www.java.net/blog/jjviana/archive/2010/03/16/jpa-clouds

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