Claus Stadler created JENA-2302:
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Summary: RowSetReaderJSON is not streaming
Key: JENA-2302
URL: https://issues.apache.org/jira/browse/JENA-2302
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 4.5.0
Reporter: Claus Stadler
Retrieving all data from out TDB2 endpoint with jena 2.5.0-SNAPSHOT is no
longer streaming for the JSON format. I tracked the issue to RowSetReaderJson
which reads everything into in memory (and then checks whether it is a SPARQL
ASK result)
{code:java}
public class RowSetReaderJson {
private void parse(InputStream in) {
JsonObject obj = JSON.parse(in); // !!! Loads everything !!!
// Boolean?
if ( obj.hasKey(kBoolean) ) { ... }
}
}
{code:java}
Streaming works when switching the to RS_XML in the example below:
{code:java}
public class Main {
public static void main(String[] args) {
System.out.println("Test Started");
try (QueryExecution qe = QueryExecutionHTTP.create()
.acceptHeader(ResultSetLang.RS_JSON.getContentType().getContentTypeStr())
.endpoint("http://moin.aksw.org/sparql";).queryString("SELECT *
{ ?s ?p ?o }").build()) {
qe.execSelect().forEachRemaining(System.out::println);
}
System.out.println("Done");
}
}
{code}
For completeness, I can rule out any problem with TDB2 because streaming of
JSON works just fine with:
curl --data-urlencode "query=select * { ?s ?p ?o }"
"http://moin.aksw.org/sparql";
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