// get named window processor instance
NamedWindowProcessor processor = services.getNamedWindowService().getProcessor(onTriggerWindowDesc.getWindowName());
NamedWindowProcessorInstance processorInstance = processor.getProcessorInstance(agentInstanceContext);
// obtain on-expr view
NamedWindowOnExprBaseView onExprBaseView = processorInstance.getRootViewInstance().addOnExpr(onExprFactory, agentInstanceContext, validatedJoin, activatorResultEventType, pair.getFirst(), onTriggerWindowDesc.getOptionalAsName(), excludePlanHint, indexHint);
onExprView = onExprBaseView;
stopCallbacks.add(onExprBaseView);
}
// variable assignments
else if (statementSpec.getOnTriggerDesc() instanceof OnTriggerSetDesc)