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feat(automation): structured parallel block (ADR-0031, task 3) - #1489
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Add engine execution for the `parallel` block — a structured construct with an implicit join (ADR-0031 §Decision 2), building on the loop container PR. - new builtin/parallel-node.ts: runs config.branches[] regions concurrently in the enclosing variable scope via engine.runRegion() and continues once when all complete — no author-visible split/join gateway. Branch failure fails the block (→ fault edge / error handling); durable pause inside a branch is a clear error. - registered as a built-in node executor (builtin/index.ts). - well-formedness (>=2 branches, single-entry/single-exit regions) is already enforced at registerFlow() by validateControlFlow (shipped with the loop PR). - showcase FanOutNotifyFlow demonstrates the parallel block; changeset added. https://claude.ai/code/session_012ti8cx3TkdiQdjCnZXZg2Q
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This was referenced Jun 1, 2026
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The structured control-flow constructs (loop/parallel/try-catch) and the BPMN interop mapping are implemented and merged (#1482, #1489, #1499, #1500; docs #1497). Flip ADR-0031 from Proposed to Accepted and record the implementing PRs and the deferred follow-ups (#1504 BPMN XML plugin, #1505 region step logs). https://claude.ai/code/session_012ti8cx3TkdiQdjCnZXZg2Q Co-authored-by: Claude <noreply@anthropic.com>
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Implements ADR-0031 task 3 (issue #1479) — engine execution for the structured
parallelblock with an implicit join. Builds on the merged loop-container PR (#1482), which already shipped the construct schemas (ParallelConfigSchema), region well-formedness analysis, andAutomationEngine.runRegion().What's in this PR
@objectstack/service-automation—builtin/parallel-node.ts(new)parallelnode declares N branch regions inconfig.branches[]. The executor runs every branch concurrently (Promise.all, viarunRegion) in the enclosing variable scope and continues once when all branches complete — the join is implicit at block end, engine-synchronized. No author-visible split/join gateway to mis-wire or deadlock; the node's ordinary out-edges are the after-block continuation.awaitpoints and the sharedvariablesmap is never torn. Branches should write distinct variables (last-writer-wins on collision, same as the engine's existing unconditional-edge fan-out).Well-formedness (≥2 branches; each branch single-entry/single-exit, acyclic) is already enforced at
registerFlow()byvalidateControlFlowfrom the loop PR.Showcase / changeset
FanOutNotifyFlow— notifies the owner and Slack concurrently, joining before completion.Tests
builtin/parallel-node.test.ts— 6 tests: all-branches-run + implicit join, join waits for the slowest branch, multi-node branch ordering, branch-failure fails the block, and two register-time rejections (<2 branches; malformed branch region).Roadmap (#1479)
https://claude.ai/code/session_012ti8cx3TkdiQdjCnZXZg2Q
Generated by Claude Code