Examples with ServiceExecution org.apache.jena.sparql.service.ServiceExecution used on opensource projects

Example 1 with ServiceExecution

use of org.apache.jena.sparql.service.ServiceExecution in project jena by apache.

the class QueryIterService method nextStage.

@Override
protected QueryIterator nextStage(Binding outerBinding) {
    boolean silent = opService.getSilent();
    ExecutionContext execCxt = getExecContext();
    Context cxt = execCxt.getContext();
    ServiceExecutorRegistry registry = ServiceExecutorRegistry.get(cxt);
    ServiceExecution svcExec = null;
    OpService substitutedOp = (OpService) QC.substitute(opService, outerBinding);
    try {
        // ---- Find handler
        if (registry != null) {
            for (ServiceExecutorFactory factory : registry.getFactories()) {
                // Internal consistency check
                if (factory == null) {
                    Log.warn(this, "SERVICE <" + opService.getService().toString() + ">: Null item in custom ServiceExecutionRegistry");
                    continue;
                }
                svcExec = factory.createExecutor(substitutedOp, opService, outerBinding, execCxt);
                if (svcExec != null)
                    break;
            }
        }
        // ---- Execute
        if (svcExec == null)
            throw new QueryExecException("No SERVICE handler");
        QueryIterator qIter = svcExec.exec();
        qIter = QueryIter.makeTracked(qIter, getExecContext());
        // There should be no variables in common because of the OpSubstitute.substitute
        return new QueryIterCommonParent(qIter, outerBinding, getExecContext());
    } catch (RuntimeException ex) {
        if (silent) {
            Log.warn(this, "SERVICE " + NodeFmtLib.strTTL(substitutedOp.getService()) + " : " + ex.getMessage());
            // Return the input
            return QueryIterSingleton.create(outerBinding, getExecContext());
        }
        throw ex;
    }
}