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：

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;
        }
    }

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

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();
        }
}

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

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();
        }
}

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---object event example
send shirt:74.50
sumPrice:74.5
received: shirt:74.5
send shoes:60.50
sumPrice:135
received: shoes:60.5
send coat:70.50
sumPrice:131
received: coat:70.5