Optional ReadonlynodeNode id when source is node-subscriber or subscribe-initial.
ReadonlysourceWhere the error came from.
node-subscriber — Phase G per-node observer fire.commit-subscriber — Phase H per-commit observer fire.subscribe-initial — synchronous initial fire from
Graph.subscribe.subscribe-reads-initial — synchronous initial fire from
Graph.subscribeReads (#701).subscribe-reads — Phase G per-projection observer fire from
Graph.subscribeReads (#701).subscribe-reads-projection — projection closure threw during a
Phase G re-run (#701); the registration is preserved and the
recorded read-set is left intact, so the next commit will retry.ReadonlytimeGraphTime at which the observer was invoked.
Context object passed to ObserverErrorHandler when an observer callback throws.
Remarks
Observer plumbing is a first-class engine primitive, not an afterthought; this record gives error handlers enough information to attribute the failure to a specific subscription path (per-node fire vs. per-commit fire vs. the initial-fire that happens at subscription time).