How is this not just a more verbose equivalent of a shell script watchdog? The idea is sound (if hardly mind-bending), but the implementation here seems overly complicated.
For starters, it is baked into the language and can handle things like dynamically adding or removing items from the supervisory tree; it works are a more fine-grained level than shell scripts. It can also provide both all-or-nothing (e.g. if one item dies then restart everything in my supervisory tree) or one-for-one (just restart the bit that died).
