Examples of programatic creation of EPN elements

Question

Hello,
I'm looking for examples of how to create things like Channels, CQL Statements, etc programatically, not just statically creating them using the EPN editor in eclipse.
For example:
I want to have a static processing network that just takes all events and passes them to a bean. The bean then looks at the events and decides that a new channel should be created for something in this event (say event type, or subject). So it would dynamically create a new channel and pass that event on to it. Then any time it started seeing similar events, it would pass those on to this new channel as well. I'm not sure if this is a good idea or a good use of CEP or not though at the same time...
Here is another example:
We want to expose an API to allow clients to create new queries into the stream on demand. So we have predefined queries set up that handle default events. A new client comes in and wants to start getting certain events (content based routing basically). So they make a call to the API and say I want to start getting events with x in them. A new CQL query is created (select * from stream [now] where thing = x) and probably also a new channel/bean is created as a destination.
I can't find anywhere that describes how you do any of these things. You can do all this using Esper, so I assume Oracles CEP has a way to do it too...If you can help, that would be great.

Answer 1

serff wrote:
I want to have a static processing network that just takes all events and passes them to a bean. The bean then looks at the events and decides that a new channel should be created for something in this event (say event type, or subject). So it would dynamically create a new channel and pass that event on to it. Then any time it started seeing similar events, it would pass those on to this new channel as well. I'm not sure if this is a good idea or a good use of CEP or not though at the same time... We don't currently expose any programmatic API for creating EPN elements - part of this is because the connection between elements is augmented in many different ways when the EPN is constructed and also because we optimize certain cases. What is your new channel going to do in this instance? There is nothing stopping you writing an event bean that manages its own "channels" (written by you), but it would help to know a few more details in order to make any recommendation here.
Here is another example:
We want to expose an API to allow clients to create new queries into the stream on demand. So we have predefined queries set up that handle default events. A new client comes in and wants to start getting certain events (content based routing basically). So they make a call to the API and say I want to start getting events with x in them. A new CQL query is created (select * from stream [now] where thing = x) and probably also a new channel/bean is created as a destination. The JMX API allows you to create queries dynamically - this is what wlevs.admin does. This may be the easiest way to manage dynamic queries. You could also do this directly by making a bean ApplicationContextAware (a Spring class) and then from that get the BeanFactopry and then the bean you are interested in, cast to the appropriate API and add rules. Unfortunately the java API for the processor is not public, so you would be on your own trying this approach.