Package org.datanucleus.store.federation

Package providing management for federation of datastores.

See: Description

Class Summary

Class	Description
FederatedJDOQLQuery	JDOQL query that is federated across multiple datastores
FederatedPersistenceHandler	Persistence handler for federated datastores.
FederatedQueryManagerImpl	Manager for queries for federated datastores.
FederatedStoreManager	A federated StoreManager orchestrates the persistence/retrieval for multiple datastores.

Package org.datanucleus.store.federation Description

Package providing management for federation of datastores. This allows us to have a PMF/EMF for multiple datastores, and to distribute any insert/update/delete/fetch to the relevant datastore. It also allows us to query across multiple datastores and federate the results.

The more standard alternative to this is to have a PMF per datastore, and then to persist to whichever you want, and query whichever you want. Merging results is then left to the user.