The node agent runs in the node-engine: watches the wants and compositions on the link, applies one module's composition, asks the backup, writes the haves (R6-A A1, A5, A6)

internal/apply/schedule.go

@@ -127,6 +127,17 @@ func (s *Scheduler) RecordWindowsIn(w *Windows) {
 // work on the predecessor's data, under the predecessor's service, which is the one thing an
 // adopted node must not do. Nil on a converged node, where nothing is held.
 func (s *Scheduler) Sync(d *declaration.Declaration, held map[string]bool) {
+	s.sync(d, held, nil)
+}
+
+// SyncModule is Sync for one module's declaration (novox/hq ADR 0539 §9): the schedules of that module are armed,
+// re-armed or forgotten, and the schedules of every other module are left as they are. owns says whether a scheduled
+// step's id is the module's.
+func (s *Scheduler) SyncModule(d *declaration.Declaration, held map[string]bool, owns func(id string) bool) {
+	s.sync(d, held, owns)
+}
+
+func (s *Scheduler) sync(d *declaration.Declaration, held map[string]bool, owns func(id string) bool) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
@@ -177,7 +188,7 @@ func (s *Scheduler) Sync(d *declaration.Declaration, held map[string]bool) {
 	}
 
 	for id := range s.jobs {
-		if !seen[id] {
+		if !seen[id] && (owns == nil || owns(id)) {
 			delete(s.jobs, id)
 		}
 	}