fr.inria.atlanmod.neoemf.data

Interface PersistenceBackend

All Superinterfaces:

AutoCloseable, Closeable

All Known Implementing Classes:

AbstractPersistenceBackend, BlueprintsPersistenceBackend, HBasePersistenceBackend, MapDbPersistenceBackend

public interface PersistenceBackend
extends Closeable

An adapter on top of a database that provides specific methods for communicating with the database that it uses. Each PersistenceBackend manage one single instance of a database.

It does not provide model-level translation; these functions are handled by DirectWriteStores.

Future: An abstraction of PersistenceBackends will be implemented to define a global behaviour. For now, it provides only basic methods for closing or saving a model, but later, it will provide generic methods to add, delete or get a value.

See Also:

DirectWriteStore

Method Summary

Modifier and Type	Method and Description
void	close() In our case, it cleanly stops the underlying database.
default Object	getAllInstances(EClass eClass, boolean strict) Back-end specific computation of Resource.getAllContents().
boolean	isClosed() Returns whether the underlying database is closed.
void	save() Saves the modifications of the owned EObjects in the underlying database.

Method Detail

isClosed

boolean isClosed()

Returns whether the underlying database is closed.

Returns:

true if the database is closed, otherwise false

close

void close()

In our case, it cleanly stops the underlying database.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

save

void save()

Saves the modifications of the owned EObjects in the underlying database.

getAllInstances

default Object getAllInstances(EClass eClass,
                               boolean strict)

Back-end specific computation of Resource.getAllContents().

Parameters:

eClass - the class to compute the instances of

strict - true if the lookup searches for strict instances

Returns:

an Object containing the back-end specific objects corresponding to the instances of the EClass

Throws:

UnsupportedOperationException - if the back-end does not support all instances lookup