Author: Charles Hooper <email@example.com>
Framework to monitor a [generic] value and trigger actions based on that value.
The hope is that a programmer can subclass a generic object and write their own code to access a given value (could be a redis object, a text file, whatever) and then register callbacks based on the results of that value.
This is implemented through user/programmer-defined filter functions and user/programmer-defined callbacks.
Context: Originally written to automatically deploy new EC2 instances based on the size of a celery task queue.