Vega dataflow graph.
Classes and utilities for a reactive dataflow graph that can process both scalar and streaming relational data. A central Graph instance manages and schedules a collection of Node instances, each of which is an operator in the dataflow. A Signal is a special type of node that maintains the latest value defined over a dynamic data stream. A Node may be connected to another via dependencies of varying granularity (e.g., based on data tuples, specific data fields and/or signal values).
Upon update, the Graph propagates (or "pulses") an update through the network in the form of a ChangeSet, triggering targeted recomputation of nodes in a topologically-sorted order.