org.rvpf.store.server.the.bdb

Class BDBBackEnd

Object

BDBBackEnd

All Implemented Interfaces:

BackEnd

public class BDBBackEnd
extends Object
implements BackEnd

Berkeley DB (Java Edition) back-end.

Field Summary

Fields

Modifier and Type	Field and Description
static String	BDB_DIR_PROPERTY The BDB-JE environment directory property.
static String	DEFAULT_BDB_DIR The default BDB-JE environment directory.

Constructor Summary

Constructors

Constructor and Description
BDBBackEnd()

Method Summary

Modifier and Type	Method and Description
void	beginUpdates() Begins updates.
void	close() Closes.
void	commit() Commits.
StoreValues	createResponse(StoreValuesQuery query, Optional<Identity> identity) Creates store values for a store query.
int	delete(VersionedValue versionedValue) Deletes a point value.
void	endUpdates() Ends updates.
void	open() Opens.
void	rollback() Rolls back.
boolean	setUp(TheStoreServiceAppImpl theStoreAppImpl) Sets up the back end.
boolean	supportsCount() Asks if the back end supports count.
void	tearDown() Tears down what has been set up.
void	update(VersionedValue versionedValue) Updates a point value.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface BackEnd

newArchiver, purge, supportsPurge

Field Detail

BDB_DIR_PROPERTY

public static final String BDB_DIR_PROPERTY

The BDB-JE environment directory property.

See Also:

Constant Field Values

DEFAULT_BDB_DIR

public static final String DEFAULT_BDB_DIR

The default BDB-JE environment directory.

See Also:

Constant Field Values

Constructor Detail

BDBBackEnd

public BDBBackEnd()

Method Detail

beginUpdates

public void beginUpdates()

Begins updates.

Specified by:

beginUpdates in interface BackEnd

close

public void close()

Closes.

Specified by:

close in interface BackEnd

commit

public void commit()

Commits.

Specified by:

commit in interface BackEnd

createResponse

public StoreValues createResponse(StoreValuesQuery query,
                                  Optional<Identity> identity)

Creates store values for a store query.

Specified by:

createResponse in interface BackEnd

Parameters:

query - The store query.

identity - The optional requesting identity.

Returns:

The store values.

delete

public int delete(VersionedValue versionedValue)

Deletes a point value.

Specified by:

delete in interface BackEnd

Parameters:

versionedValue - The point value to delete.

Returns:

The number of deleted values (0 .. 2).

endUpdates

public void endUpdates()

Ends updates.

Specified by:

endUpdates in interface BackEnd

open

public void open()
          throws ServiceNotAvailableException

Opens.

Specified by:

open in interface BackEnd

Throws:

ServiceNotAvailableException - On failure.

rollback

public void rollback()

Rolls back.

Specified by:

rollback in interface BackEnd

setUp

public boolean setUp(TheStoreServiceAppImpl theStoreAppImpl)

Sets up the back end.

Specified by:

setUp in interface BackEnd

Parameters:

theStoreAppImpl - The TheStore application instance.

Returns:

True on success.

supportsCount

public boolean supportsCount()

Asks if the back end supports count.

Specified by:

supportsCount in interface BackEnd

Returns:

True if count is supported.

tearDown

public void tearDown()

Tears down what has been set up.

Specified by:

tearDown in interface BackEnd

update

public void update(VersionedValue versionedValue)

Updates a point value.

Specified by:

update in interface BackEnd

Parameters:

versionedValue - The point value to update.