My first true Java EE App, some basic questions?

Warning... Enterprise Java Newbie:

Basic Application Components:

1) Core component would be a continuous data processor updating internal caches and using business logic to generate "events". These "events" are cached as well as persisted in a database.

2) Web Service to manipulate the processor configuration in real-time (without the processor code having to hit a config DB periodically)

3) Web Service or JMS Queue to serve up generated events to other subscribers

4) Web Client for reporting (cache contents/database) and configuration (calls the config web service)

I'm going to run this on Glassfish, using NetBeans 7.0.

My question resides primarily with item 1 and what it will be in a Java EE environment, running on Glassfish. Would it be a Singleton Session bean?

Thanks,
Gary

Sounds more like something that users the timer server. Is it important that only on instance of this processor exists?