com.bigdata.bop.fed

Interface IQueryEngineFactory

All Known Implementing Classes:

QueryEngineFactoryBase

public interface IQueryEngineFactory

Factory for a QueryEngine or derived class.

Author:

bryan

See Also:

QueryEngineFactory.getInstance(), (Convert QueryEngineFactory to use getInstance() and public interface for accessor methods.)

Method Summary

Methods

Modifier and Type	Method and Description
QueryEngine	getExistingQueryController(IBTreeManager indexManager) Singleton factory test (does not create the query controller) for standalone or scale-out.
FederatedQueryEngine	getFederatedQueryController(IBigdataFederation<?> fed) New query controller for scale-out.
QueryEngine	getQueryController(IIndexManager indexManager) Singleton factory for standalone or scale-out.
int	getQueryControllerCount() Return the #of live query controllers.
QueryEngine	getStandaloneQueryController(IBTreeManager indexManager) Singleton factory for standalone.

Method Detail

getExistingQueryController

QueryEngine getExistingQueryController(IBTreeManager indexManager)

Singleton factory test (does not create the query controller) for standalone or scale-out.

Parameters:

indexManager - The database.

Returns:

The query controller iff one has been obtained from the factory and its weak reference has not been cleared.

getQueryController

QueryEngine getQueryController(IIndexManager indexManager)

Singleton factory for standalone or scale-out.

Parameters:

indexManager - The database.

Returns:

The query controller.

getStandaloneQueryController

QueryEngine getStandaloneQueryController(IBTreeManager indexManager)

Singleton factory for standalone.

Parameters:

indexManager - The index manager. Can be a TemporaryStore or Journal.

Returns:

The query controller.

getFederatedQueryController

FederatedQueryEngine getFederatedQueryController(IBigdataFederation<?> fed)

New query controller for scale-out.

Note: This is NOT used for the QueryEngine that is embedded within the DataService. That instance is setup by the DataService itself and relies on a view of the shards as locally available to the DataService

Parameters:

fed - The federation.

Returns:

The query controller.

getQueryControllerCount

int getQueryControllerCount()

Return the #of live query controllers.