How to Write an Activity that Creates Data Service Resources

OGSA-DAI provides a mechanism for activities to create new data service resources. This mechanism is very useful when you wish to create data service resources that are configured dynamically by clients rather than statically at the server. The best pattern for doing this is to have a factory data service resource and one or more activities that create the child data service resources.

Two types of data service resources can be created dynamically via activities these are:

• Persisted Data Service Resources that are created via a set of configuration files and will survive a container shutdown.
• Transient Data Service Resources that are created via Java objects and are lightweight and easy to configure but will not survive a container shutdown.

The tasks required to create data service resources in an activity are different depending on whether it is a persisted or transient resource. For full instructions see:

• How to create a persisted data service resource
• How to create a transient data service resource