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https://issues.apache.org/jira/browse/JENA-624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14999205#comment-14999205
]
ASF GitHub Bot commented on JENA-624:
-------------------------------------
Github user afs commented on a diff in the pull request:
https://github.com/apache/jena/pull/94#discussion_r44455195
--- Diff:
jena-arq/src/main/java/org/apache/jena/sparql/core/DatasetGraphFactory.java ---
@@ -53,45 +54,38 @@ private static void copyOver(DatasetGraph dsgDest,
DatasetGraph dsgSrc)
* Create a DatasetGraph starting with a single graph.
* New graphs must be explicitly added.
*/
- public static DatasetGraph create(Graph graph)
+ public static DatasetGraph create(final Graph graph)
{
- DatasetGraph dsg2 = createMemFixed() ;
+ final DatasetGraph dsg2 = createMemFixed() ;
dsg2.setDefaultGraph(graph) ;
return dsg2 ;
}
-
+
/**
* Create a DatasetGraph which only ever has a single default graph.
*/
- public static DatasetGraph createOneGraph(Graph graph) { return new
DatasetGraphOne(graph) ; }
+ public static DatasetGraph createOneGraph(final Graph graph) { return
new DatasetGraphOne(graph) ; }
/** Interface for makign graphs when a dataset needs to add a new
graph.
* Return null for no graph created.
- */
+ */
public interface GraphMaker { public Graph create() ; }
/** A graph maker that doesn't make graphs */
- public static GraphMaker graphMakerNull = new GraphMaker() {
- @Override
- public Graph create()
- {
- return null ;
- } } ;
-
- private static GraphMaker memGraphMaker = new GraphMaker()
- {
- @Override
- public Graph create()
- {
- return GraphFactory.createDefaultGraph() ;
- }
- } ;
-
+ public static GraphMaker graphMakerNull = () -> null ;
+
+ private static GraphMaker memGraphMaker = () ->
GraphFactory.createDefaultGraph() ;
+
+ /**
+ * @return a DatasetGraph which features transactional in-memory
operation
+ */
+ public static DatasetGraph createTxMem() { return new
DatasetGraphInMemory(); }
+
--- End diff --
createTxMem => createTxnMem
> Develop a new in-memory RDF Dataset implementation
> --------------------------------------------------
>
> Key: JENA-624
> URL: https://issues.apache.org/jira/browse/JENA-624
> Project: Apache Jena
> Issue Type: Improvement
> Reporter: Andy Seaborne
> Assignee: A. Soroka
> Labels: gsoc, gsoc2015, java, linked_data, rdf
>
> The current (Jan 2014) Jena in-memory dataset uses a general purpose
> container that works for any storage technology for graphs together with
> in-memory graphs.
> This project would develop a new implementation design specifically for RDF
> datasets (triples and quads) and efficient SPARQL execution, for example,
> using multi-core parallel operations and/or multi-version concurrent
> datastructures to maximise true parallel operation.
> This is a system project suitable for someone interested in datatbase
> implementation, datastructure design and implementation, operating systems or
> distributed systems.
> Note that TDB can operate in-memory using a simulated disk with
> copy-in/copy-out semantics for disk-level operations. It is for faithful
> testing TDB infrastructure and is not designed performance, general in-memory
> use or use at scale. While lesson may be learnt from that system, TDB
> in-memory is not the answer here.
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