Jurassic Phoenix - reviving yesterday\'s data
Jurassic Phoenix is a simple solution to the problem of evolution of serialized data.
Why use Jurassic Phoenix?
The frustration
Serialization is great for persistence, because it is automatic, dynamic and
Tutorial Details:
Jurassic Phoenix allows you to make the same changes to your serialized data as your class evolutions, so it matches the new structure of your evolved application, and thus can be read again. (An application can evolve in many different ways - from minor syntactic changes, to deep rearchitecting. If Jurassic Phoenix cannot yet do what you need, please check the list at the end of this webpage, and email us which ones you need - we'll bump up its priority).
Serialization is immensely attractive for persistence - it is instant, dynamic and requires no coding. So why hasn't this simple, convenient and low-cost solution become a disruptive innovation for persistence? The difficulty of evolving persisted data seems to be the show-stopper. Now that Jurassic Phoenix is solving this problem, we may see a gradual change in how developers and architects think about long-term persistence - at the very least, it will provide a viable alternative to consider.
Alternatives
Database evolution
When an application evolves that uses a relational database (RDB) as its persistent store, the code that calls the database needs to be updated. The database is a relatively fixed point (since its holds long-term data, will generally outlast the application and language it's written in, and several applications may depend on it), so that when the application changes, the it is the interface between application and database that must accommodate the change. The amount of work involved in persisting objects to a RDB is well known, and several approaches attempt to alleviate it, such as Object Databases, Object Relational (OR) mappers, and serialization (such as JSX). Note that "schema evolution" (when the data in the database is evolved) is not always necessary, and most of the evolution is accomodated as a by-product of the application code that calls the database.
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