com.bigdata.rdf.sparql.ast.service.history

Class HistoryServiceFactory

java.lang.Object

com.bigdata.rdf.sparql.ast.eval.CustomServiceFactoryBase

com.bigdata.rdf.sparql.ast.service.history.HistoryServiceFactory

All Implemented Interfaces:

CustomServiceFactory, ServiceFactory

public class HistoryServiceFactory
extends CustomServiceFactoryBase

This service tracks KB updates via an IChangeLog and is responsible for maintaining an ordered index over the assertions that have been added to or removed from a KB instance.

Author:

Bryan Thompson

See Also:

History Service

Constructor Summary

Constructors

Constructor and Description
HistoryServiceFactory()

Method Summary

Methods

Modifier and Type	Method and Description
ServiceCall<?>	create(ServiceCallCreateParams params) TODO Implement: Query should support an index scan of a date range with optional filters on the (s,p,o,c) and add/remove flags.
IServiceOptions	getServiceOptions() Return options for the service end point.
void	startConnection(BigdataSail.BigdataSailConnection conn) Register an IChangeLog listener that will manage the maintenance of the describe cache.

Methods inherited from class com.bigdata.rdf.sparql.ast.eval.CustomServiceFactoryBase

getDesiredBound, getRequiredBound

Methods inherited from class java.lang.Object

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

Constructor Detail

HistoryServiceFactory

public HistoryServiceFactory()

Method Detail

getServiceOptions

public IServiceOptions getServiceOptions()

Description copied from interface: ServiceFactory

Return options for the service end point. Depending on the implementation, these options MAY be configurable.

create

public ServiceCall<?> create(ServiceCallCreateParams params)

TODO Implement: Query should support an index scan of a date range with optional filters on the (s,p,o,c) and add/remove flags. It might make more sense to index in (POS) order rather than SPO order so we can more efficiently scan a specific predicate within some date range using an advancer pattern.

The restrictions that this service COULD apply to the index scan are:

fromTime

Inclusive lower bound.

toTime

Exclusive upper bound (e.g., the first commit point NOT to be reported).

P

The IV for the predicate (this is the first statement key component in the history index for both triples and quads mode KBs)

In addition, it could filter on the remaining fields (that is, skip over tuples that fail a filter):

S, O [, C]

The IV for the subject, object, and (for quads mode, the context).

action

The ChangeAction.

type

The StatementTypeEnum.

Parameters:

params - The pararameters, which are encapsulated by this interface.

Returns:

The object which can be used to evaluate the SERVICE clause.

startConnection

public void startConnection(BigdataSail.BigdataSailConnection conn)

Register an IChangeLog listener that will manage the maintenance of the describe cache.