NEsper事件处理 z

http://esper.codehaus.org/nesper/documentation/documentation.html

环境配置

1. NEsper库下载：下载网址
2. Vs2010环境集成

在项目中添加下载的dll文件下的库即可。

• Demo展示

事件类：

1. public class ObjectEvent
2. {
3. public String itemName;
4. public double price;
5. public ObjectEvent(String itemName, double price)
6. {
7. this.itemName = itemName;
8. this.price = price;
9. }
10. public String GetItemName()//命名规则必需正确,大小写不对会导致错误
11. {
12. return itemName;
13. }
14. public double GetPrice()
15. {
16. return price;
17. }
18. }

public class ObjectEvent
    {
        public String itemName;
        public double price;
        public ObjectEvent(String itemName, double price)
        {
            this.itemName = itemName;
            this.price = price;
        }
        public String GetItemName()//命名规则必需正确,大小写不对会导致错误
        {
            return itemName;
        }
        public double GetPrice()
        {
            return price;
        }
    }

事件发送类

1. class EventSender
2. {
3. private static EPServiceProvider epService = EPServiceProviderManager.GetDefaultProvider();
4. static public void objectEventSend()
5. {
6. Configuration config = new Configuration();
7. EPServiceProvider epService = EPServiceProviderManager.GetDefaultProvider();
8. String epl =
9. "select *,sum(Price) from ConsoleApplicationNesper.ObjectEvent.win:length(2)";
10. EPStatement statement = epService.EPAdministrator.CreateEPL(epl);
11. statement.Events += EventListener.objectEventHandle;
12. ObjectEvent e = new ObjectEvent("shirt", 74.50);
13. Console.WriteLine("send shirt:74.50");
14. epService.EPRuntime.SendEvent(e);
15. ObjectEvent e1 = new ObjectEvent("shoes", 60.50);
16. Console.WriteLine("send shoes:60.50");
17. epService.EPRuntime.SendEvent(e1);
18. ObjectEvent e2 = new ObjectEvent("coat", 70.50);
19. Console.WriteLine("send coat:70.50");
20. epService.EPRuntime.SendEvent(e2);
21. Console.ReadKey();
22. }
23. }

class EventSender
    {
        private static EPServiceProvider epService = EPServiceProviderManager.GetDefaultProvider();
        static public void objectEventSend()
        {
            Configuration config = new Configuration();
            EPServiceProvider epService = EPServiceProviderManager.GetDefaultProvider();
            String epl =
                "select *,sum(Price) from ConsoleApplicationNesper.ObjectEvent.win:length(2)";

            EPStatement statement = epService.EPAdministrator.CreateEPL(epl);
            statement.Events += EventListener.objectEventHandle;

            ObjectEvent e = new ObjectEvent("shirt", 74.50);
            Console.WriteLine("send shirt:74.50");
            epService.EPRuntime.SendEvent(e);
            ObjectEvent e1 = new ObjectEvent("shoes", 60.50);
            Console.WriteLine("send shoes:60.50");
            epService.EPRuntime.SendEvent(e1);
            ObjectEvent e2 = new ObjectEvent("coat", 70.50);
            Console.WriteLine("send coat:70.50");
            epService.EPRuntime.SendEvent(e2);

            Console.ReadKey();
        }
}

事件监听类

1. class EventListener
2. {
3. static public void objectEventHandle(Object sender, UpdateEventArgs e)
4. {
5. EventBean eventResult = e.NewEvents[0];
6. Console.WriteLine("sumPrice:" + eventResult.Get("sum(Price)"));
7. Console.WriteLine("received: " + eventResult.Get("ItemName") + ":"
8. + eventResult.Get("Price"));
9. //Console.ReadKey();
10. }
11. }

class EventListener
    {
        static public void objectEventHandle(Object sender, UpdateEventArgs e)
        {
            EventBean eventResult = e.NewEvents[0];
            Console.WriteLine("sumPrice:" + eventResult.Get("sum(Price)"));
            Console.WriteLine("received: " + eventResult.Get("ItemName") + ":"
                + eventResult.Get("Price"));
            //Console.ReadKey();
        }
}

运行结果

1. 1---object event example
2. send shirt:74.50
3. sumPrice:74.5
4. received: shirt:74.5
5. send shoes:60.50
6. sumPrice:135
7. received: shoes:60.5
8. send coat:70.50
9. sumPrice:131
10. received: coat:70.5