Waterfall

Waterfall is a declarative task execution framework. Why Another Execution Framework

There are many, many execution frameworks out there that support defining tasks with inter-task dependencies. Most of them only partially include scheduling in their design.

Overview

Resources

Resources are at the heart of Waterfall. They are simple things: labels with an associated set of time intervals. Tasks produce resources for given intervals.

Tasks

Tasks are commands that run on a set schedule. Each task produces one or more Resource. The run schedule naturally breaks up the timeline into intervals. When a task runs at time T_n, it will make make each resource it provides available over the interval (T_{n-1},T].