com.bigdata.rdf.sparql.ast.cache

Interface IDescribeCache

All Known Implementing Classes:

DescribeCache

public interface IDescribeCache

A maintained cache for the DESCRIBE of RDF resources.

Author:

Bryan Thompson TODO When has partitioned, each NSS instance (or DESCRIBE cache partition) should directly handle the describe of IVs that are directed to that partition.

Method Summary

Methods

Modifier and Type	Method and Description
void	destroy() Destroy the cache.
void	insert(IV<?,?> iv, org.openrdf.model.Graph g) Insert/update the cache entry for an IV.
void	invalidate(Set<IV<?,?>> ivs) Invalidate the identified cache entries.
org.openrdf.model.Graph	lookup(IV<?,?> iv) Lookup and return the cache entry.

Method Detail

destroy

void destroy()

Destroy the cache.

invalidate

void invalidate(Set<IV<?,?>> ivs)

Invalidate the identified cache entries.

Parameters:

ivs - The IVs for the cache entries to be invalidated.

lookup

org.openrdf.model.Graph lookup(IV<?,?> iv)

Lookup and return the cache entry.

Parameters:

iv - The IV.

Returns:

The cache entry -or- null if there is no entry for that IV. TODO Vector lookups for query. We will need to use that to support a star-join against the DESCRIBE cache (leveraging materialized joins). TODO Offer a stream oriented response. For a single Graph , that could be a GraphQueryResult. For vectored lookups, this might be a stream of binding sets (vectored lookups make sense primarily in star joins, so this would really be the signature for the star-join operator).

insert

void insert(IV<?,?> iv,
          org.openrdf.model.Graph g)

Insert/update the cache entry for an IV.

Parameters:

iv - The IV.

g - The Graph that describes that IV. TODO Vector inserts. TODO We probably need to include the timestamp of the database view from which the resource description was constructed.