[
https://issues.apache.org/jira/browse/JENA-626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14962379#comment-14962379
]
ASF GitHub Bot commented on JENA-626:
-------------------------------------
Github user ajs6f commented on a diff in the pull request:
https://github.com/apache/jena/pull/95#discussion_r42320957
--- Diff:
jena-arq/src/main/java/org/apache/jena/sparql/resultset/CSVOutput.java ---
@@ -102,6 +102,62 @@ public void format(OutputStream out, ResultSet
resultSet)
}
}
+ @Override
+ public void format(OutputStream out, ResultSet resultSet,
StringBuilder cacheBuilder)
+ {
+ try {
+ Writer w = FileUtils.asUTF8(out) ;
+ NodeToLabelMap bnodes = new NodeToLabelMap() ;
+ w = new BufferedWriter(w) ;
+
+ String sep = null ;
+ List<String> varNames = resultSet.getResultVars() ;
+ List<Var> vars = new ArrayList<>(varNames.size()) ;
+
+ // Convert to Vars and output the header line.
+ for( String v : varNames )
+ {
+ if ( sep != null ){
+ w.write(sep) ;
+ cacheBuilder.append(sep);
+ }
+ else
+ sep = "," ;
+ w.write(csvSafe(v)) ;
+ cacheBuilder.append(csvSafe(v));
+ vars.add(Var.alloc(v)) ;
+ }
+ w.write(NL) ;
+ cacheBuilder.append(NL);
+
+ // Data output
+ for ( ; resultSet.hasNext() ; )
--- End diff --
These two loops could be managed a bit more tightly between
`resultSet::forEachRemaining` and `vars.stream()::map`.
> SPARQL Query Caching
> --------------------
>
> Key: JENA-626
> URL: https://issues.apache.org/jira/browse/JENA-626
> Project: Apache Jena
> Issue Type: Improvement
> Reporter: Andy Seaborne
> Labels: java, linked_data, rdf, sparql
>
> Add a caching layer to Fuseki to cache the results of SPARQL Query requests.
> This cache should allow for in-memory and disk-based caching, configuration
> and cache management, and coordination with data modification.
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