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

["Claus Stadler (Jira)" <ji...@apache.org>]

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

Claus Stadler updated JENA-2302:
--------------------------------
    Description: 
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}


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"


  was:
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"



> 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
>            Priority: Major
>
> 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}
> 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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