Operator Initialization methods.

[Tushar Gosavi]

If my operator implements ActivationListener then what is the order of
following calls.

setup, teardown, activate, deactivate
and when they are called?

In which scenario it is preferable to use ActivationListerner instead of
using setup and teardown?

also If my operator throws an exception during any of beginWindow, process
and endWindow method, will teardown/deactive will get call on it?

- Tushar.