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McObject grants Perst persistence to all objects


By Alex Handy
January 29, 2009 — 
Since its creation, there has been one trouble spot for McObject's Perst embeddable database: persisting foreign objects. On Monday, McObject released Perst 4.0, which fixes this trouble spot and extends persistence to all objects, regardless of where they came from.

Steve Graves, president of McObject, said that Perst's real value is its persistence. “The major improvement in it is the ability to store foreign objects. One of the strengths of Perst has always been the ability to have nearly transparent persistence for plain old Java objects. We eliminated that hurdle, and we're now able to store any type of object, whether it's of the application creator's creation, or [it's] inherited,” he said.

Perst is open source and available under a dual license, said Graves, adding that for the commercial license, annual technical support costs US$2,000 per developer. The software can be downloaded from mcobject.com/perst_eval.

Graves said that persisting any object was a tough challenge for the Perst team. “With regard to the ability to persist foreign objects, that was a bit of an achievement. There are other products that do it, but they do it in one of two ways: They either have a customized JVM that has some special capability that allows that to happen, or they inject bytecode into the preprocessed Java code. Either way, you end up complicating the development project,” said Graves. Perst, he said, uses neither of these methods.

Instead, said Graves, the Perst team figured out a way to persist all objects inside of the database code itself. That means that Perst doesn't have any external requirements, nor is it tied to a specific virtual machine.

Perst 4.0 has a smaller cousin, Perst Lite, which was also updated for this release. The big change there is the addition of full text search for the entire database. Perst Lite is targeted at Java ME applications, where resources are constrained, Graves said.


Related Search Term(s): databases, McObject


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