Aklakan commented on code in PR #3184:
URL: https://github.com/apache/jena/pull/3184#discussion_r2256603786
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jena-examples/src/main/java/arq/examples/ExampleDBpediaViaRemoteDataset.java:
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@@ -0,0 +1,43 @@
+package arq.examples;
+
+import java.util.concurrent.TimeUnit;
+
+import org.apache.jena.rdflink.RDFLinkHTTP;
+import org.apache.jena.rdflink.dataset.DatasetGraphOverRDFLink;
+import org.apache.jena.sparql.algebra.Table;
+import org.apache.jena.sparql.core.DatasetGraph;
+import org.apache.jena.sparql.engine.dispatch.SparqlDispatcherRegistry;
+import org.apache.jena.sparql.exec.QueryExec;
+import org.apache.jena.sparql.exec.RowSetOps;
+
+/**
+ * An example that sends a query to the DBpedia endpoint via the {@link
DatasetGraphOverRDFLink} abstraction.
+ * Technically, the query is passed through Jena's default {@link
SparqlDispatcherRegistry}.
+ */
+public class ExampleDBpediaViaRemoteDataset {
+ public static void main(String... argv) {
+ // The query string is sent to the DBpedia endpoint as is (without
parsing).
+ // By default, Jena would fail to parse it because of the undeclared
prefixes.
Review Comment:
The thing is that in this example the query goes via
`QueryExec.dataset(dsg)` - at this level the machinery does not see any HTTP
involvement.
`DatasetGraphOverSparql.initContext()` sets `ARQ.parseCheck=false` for its
context. This flag is picked up by `QueryExecBuilderDataset`.
Calling `QueryExecBuilder.build()` forwards the query string to
`SparqlDispatcherRegistry` .
`ChainingQueryDispatcherForDatasetGraphOverRDFLink.java` handles
`DatasetGraphOverRDFLink` and forwards the query string on the `RDFLink`.
The handler is registered to the global ``SparqlDispatcherRegistry`` in
`jena-rdfconnection`.
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