[RFE] introduce generic graph flow patterns

Bug #1527690 reported by milan k
This bug affects 1 person
Affects Status Importance Assigned to Milestone

Bug Description

Currently, TaskFlow supports DAGs as the richest structure a flow may have[1].
However, this limits adoption of TaskFlow for applications that require generic directed graph (with loops) as their underlying flow structure[2].
A simple example of such pattern is a finite automaton that allows repetition of a sequence of steps.

[1] TaskFlow structure; https://wiki.openstack.org/wiki/TaskFlow#Structure
[2] HA_Ironic blueprint draft; https://review.openstack.org/#/c/253675/

Ben Nemec (bnemec)
Changed in taskflow:
status: New → Confirmed
importance: Undecided → Wishlist
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