RuleEngine.java

// Init a new stateful session
KieSession kSession = kieContainer.newKieSession();

// Insert a placeholder for operations and statistics
TradingSession session = new TradingSession();
kSession.insert(session);

// We add an empty indicator to our stocks
quotations.forEach(quot -> quot.getIndicators().put("SCORE", new ScoreIndicator()));

// Submit each quotation and fire
for (AnalizedStockQuotation quot : quotations){
	kSession.insert(quot);
	kSession.fireAllRules();
}
// Recover results and clean up the memory
List<Operation> toReturn = session.getOperationList();
kSession.dispose();