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+<!-- m-wiki: type=concept slug=build-dispatch topic=build base-sha=28f54cf7bef9 generated-at=2026-05-12T00:00:00+00:00 sources=[] -->
+
+> Generated 2026-05-12 at base-sha 28f54cf7bef9. Type: concept. 0 sources.
+
+# Build Dispatch
+
+`buildObjHelper.run(build_tool)` maps a `build_tool` string from `config.yaml` to a concrete builder class instance using a Groovy `switch/case` with regex patterns.
+
+## Where it applies in this repo
+
+`src/com/meesho/stages/buildObjHelper.groovy:run`
+
+The full dispatch table (in order, first match wins):
+
+| Pattern | Builder class |
+|---------|--------------|
+| `maven` (exact) | `buildMaven` |
+| `docker` (exact) | `buildDocker` |
+| `~/^maven-.*/` | `buildMaven` |
+| `~/^python-.*/` | `buildPython` |
+| `~/^node-.*/` | `buildNode` |
+| `~/^rust.*/` | `buildRust` |
+| `~/^go.*/` | `buildGo` |
+| `gradle` (exact) | `buildGradle` |
+| `php` (exact) | `buildPhp` |
+| default | `defaultBuild()` |
+
+Each builder is instantiated fresh per build — no shared state between builds.
+
+## Why this design
+
+Groovy `switch/case` evaluates patterns top-to-bottom and returns on the first match. Regex patterns (the `~/…/` syntax) cover version-suffixed variants like `go-1.22`, `node-20`, `python-3.12` without requiring an exhaustive case list. The exact-match cases for `maven` and `docker` appear before the regex catch-all `~/^maven-.*/` to handle the legacy bare-string case.
+
+If no case matches, `defaultBuild()` is called without logging a warning — the pipeline reports success with no artifact produced. A typo in `config.yaml` (e.g. `golang` instead of `go`) produces this silent no-op. If a build succeeds but produces no Docker image, check `build_tool` spelling in `config.yaml` first.
+
+## Related
+
+- [Build stages](../03-BUILD-STAGES.md) — broader build lifecycle
+- [Language builds](../07-LANGUAGE-BUILDS.md) — per-language builder details
+
+## Sources
+
+(no raw/ sources at bootstrap)
+
+## Notes
+
+<!-- Anything below is human-owned. wiki-init never reads or modifies content under this heading. -->
+
+---
+
+[← Wiki index](../../index.md)
+
+<!-- atomic: keep this page ≤600 words. New scope → new concept page that builds on this one. Do not append paragraphs here. -->