Multiple streams in CEP Engine (Esper)

Question

I am new about esper engine and I am not sure about meaning of multiple streams. I want to create something like this:

 CepEnigine cep = new CepEngine();
 Controller.getInstance().setRuntime(cep.getRuntime());

 for(int i = 0; i < 5; i++)
     new EventGenerator().start();

Event generator class is defined like this:

public class EventGenerator extends Thread
{
    @Override
    public void run()
    {
        while (true)
        {
             MyEvent e = new Event();
             Controller.getInstance().sendToCEP(e);
             Thread.sleep(500);
        }
    }
}

Controller is multithreading singleton that keeps epruntime to send events. In CepEngine class I have also EPL statement for listening to events. Is this good meaning of multiple event streams?

THX

score 0 · Answer 1 · answered Oct 09 '13 at 06:03

An event stream is "A time ordered sequence of events in time"

Esper FAQs for Reference

In the example you have given, there is one eventStream called MyEvent

A multiple Stream example would be Streams for Order and OrderBook . From Order events we can filter out the Order for book and create an orderBook event stream,

Check this test in the esper code base TestFilterPropertySimple

Multiple streams in CEP Engine (Esper)

1 Answers1