AsyncNoodleOrderGenerator.java

/*
 * OpenCredo-Esper - simplifies adopting Esper in Java applications. 
 * Copyright (C) 2010  OpenCredo Ltd.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package org.opencredo.esper.samples.noodlebar.main;

import org.opencredo.esper.samples.noodlebar.domain.NoodleBar;
import org.opencredo.esper.samples.noodlebar.domain.NoodleOrder;
import org.opencredo.esper.samples.noodlebar.domain.OrderStatus;
import org.opencredo.esper.samples.noodlebar.domain.throughput.NoodleOrderThroughputMonitor;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Asynchronously submits a number of orders to a {@link NoodleBar}
 * 
 * @author Russ Miles (russ.miles@opencredo.com)
 * 
 */
public class AsyncNoodleOrderGenerator {

    private static final int NUMBER_OF_ORDERS = 1000;

    private static final String NOODLE_BAR_BEAN_NAME = "noodleBar";

    private static final String NOODLE_ORDER_THROUGHPUT_MONITOR_BEAN_NAME = "noodleOrderThroughputMonitor";

    private static NoodleBar noodleBar;

    private static NoodleOrderThroughputMonitor noodleOrderThroughputMonitor;

    public static void main(String[] args) {

        System.out.println("Initializing Dependencies...");

        initializeDependencies();

        long startTime = System.currentTimeMillis();

        System.out.println("Sending orders into the Noodle Bar...");

        sendSomeOrders();

        long stopTime = System.currentTimeMillis();

        long timeTaken = stopTime - startTime;

        System.out.println("Simple timer calculated at end " + timeTaken + " milliseconds for " + NUMBER_OF_ORDERS
                + " orders");

        System.out.println("The Noodle Bar is actually accepting "
                + noodleOrderThroughputMonitor.getAverageThroughput()
                + " orders per second according to continuous Esper Monitoring");

        System.exit(0);
    }

    private static void sendSomeOrders() {
        NoodleOrder[] orders = new NoodleOrder[NUMBER_OF_ORDERS];

        // Create and send events
        for (int x = 0; x < NUMBER_OF_ORDERS; x++) {
            orders[x] = new NoodleOrder();
            noodleBar.placeOrder(orders[x]);
            // Sleep a little bit between orders
            try {
                Thread.sleep(5l);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        boolean processing = true;
        while (processing) {
            processing = false;
            for (NoodleOrder order : orders) {
                if (order.getStatus() == OrderStatus.COMPLETE) {
                    System.out.println("Order Completed!");
                } else {
                    processing = true;
                }
            }
            try {
                Thread.sleep(20l);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private static void initializeDependencies() {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext(
                "classpath:async-noodlebar-context.xml");

        noodleBar = (NoodleBar) applicationContext.getBean(NOODLE_BAR_BEAN_NAME);

        noodleOrderThroughputMonitor = (NoodleOrderThroughputMonitor) applicationContext
                .getBean(NOODLE_ORDER_THROUGHPUT_MONITOR_BEAN_NAME);
    }
}