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Case of use of ESB (3/6): Management of version

With the aim of seminar  ESB in SOA: To Understand and Knowledge to use  that Xebia will give 10/9/2007, we offer you a series of articles introducing different cases of use of ESB.

The case of use of ESB introduced today is the management of version.

Problems

How to limit the impact of a rise of version of a service in an integrated architecture, when a number any of applications depend on the common version of this service?
Where, in the opposite, how to display an application ahead of time of stage customer of a not yet published version of a service?

Principle of implementation

The management of version allows to bring some change in different systems with rhythms which are peculiar to them.
Several situations can come:

• Versions are incompatible between them (it is not possible to perform a transformation towards the most recent version): the choice of a version is made by routeing.
• New version is an extension compatible with the previous version: ESB makes call towards new version by applying a transformation of the format of entrance, of the format of exit or of both formats. This avoids supporting in target application two versions of the same service.