Trading engine servlet based on actors

TradingEngineServletWithActors-creatingActors.java

@WebServlet(urlPatterns = { "/sell2", "/buy2", "/result2" })
public class TradingEngineServletWithActors extends HttpServlet {
 
    private static final ActorSystem teSystem = ActorSystem.create("TradingEngines");
    private static final Map<String, ActorRef> kids = new HashMap<>();
 
    static {
        int chunk = PRODUCT_IDS.length / NUM_KIDS;
        for (int i = 0, j = PRODUCT_IDS.length; i < j; i += chunk) {
            String[] temparray = Arrays.copyOfRange(PRODUCT_IDS, i, i + chunk);
            LOGGER.info("created engine for products " + temparray);
     
            ActorRef actor = teSystem.actorOf(Props.create(TradingEngineActor.class), "engine-" + i);
            for (int k = 0; k < temparray.length; k++) {
                LOGGER.debug("mapping productId '" + temparray[k] + "' to engine " + i);
                kids.put(temparray[k], actor);
            }
            LOGGER.info("---started trading");
            actor.tell(TradingEngineActor.RUN, ActorRef.noSender());
        }