[jira] [Assigned] (JENA-2302) RowSetReaderJSON is not streaming

["Andy Seaborne (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-2302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne reassigned JENA-2302:
-----------------------------------

    Assignee: Andy Seaborne

> RowSetReaderJSON is not streaming
> ---------------------------------
>
>                 Key: JENA-2302
>                 URL: https://issues.apache.org/jira/browse/JENA-2302
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: ARQ
>    Affects Versions: Jena 4.5.0
>            Reporter: Claus Stadler
>            Assignee: Andy Seaborne
>            Priority: Major
>
> Retrieving all data from our TDB2 endpoint with jena 4.5.0-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}
> 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: 
> {code:bash}
> curl --data-urlencode "query=select * { ?s ?p ?o }"  "http://moin.aksw.org/sparql"
> {code}



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