42 lines
2.1 KiB
Markdown
42 lines
2.1 KiB
Markdown
---
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id: reactive/node-status
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name: Implement node status signal management and computed preconditions + blockedByFailure
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status: completed
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depends_on:
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- reactive/workflow-root
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- schema/enums
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scope: moderate
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risk: high
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impact: component
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level: implementation
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---
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## Description
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Implement the reactive node status management layer: `signal<NodeStatus>` per-node lifecycle tracking, `computed<boolean>` precondition resolution, `computed<boolean>` blockedByFailure detection, and the effects that wire them together to drive automatic state transitions.
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## Acceptance Criteria
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- [ ] `src/reactive/node-status.ts` exports precondition computation, blockedByFailure computation, and status transition effects
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- [ ] `computePreconditions(node, ctx): boolean` — Sequential: previous sibling completed/skipped; Parallel: parent preconditions met; Conditional: condition evaluates; root nodes: true (no predecessors)
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- [ ] `computeBlockedByFailure(node, ctx): boolean` — any predecessor is failed/aborted
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- [ ] Start effect: `if (preconditions.value && (status === "idle" || "waiting")) → transition to "ready"`
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- [ ] Abort effect: `if (blockedByFailure.value && (status === "idle" || "waiting")) → transition to "aborted"`
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- [ ] `skipped` satisfies preconditions — a skipped predecessor is treated as "completed for precondition purposes"
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- [ ] `failed` and `aborted` block preconditions — dependents can never become ready
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- [ ] Failure follows dependency edges, not structural scope — sibling branches in Parallel are independent
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- [ ] Effects are tracked by `WorkflowReactiveRoot.effectDisposers` and cleaned up by `dispose()`
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- [ ] Unit tests: sequential preconditions, parallel preconditions, join (fork-join) preconditions, blockedByFailure cascade, skipped satisfies preconditions, failure isolation in parallel branches
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## References
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- docs/architecture/reactive-execution.md — computed preconditions, blockedByFailure, status propagation effects, failure isolation
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- docs/architecture/host-configs.md — WorkflowNode, prerequisite computation
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## Notes
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> To be filled by implementation agent
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## Summary
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> To be filled on completion |