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FastPathRouter/docs/ARCHITECTURE.md
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2026-03-15 01:15:43 +01:00

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# Architecture
FastPathRouter is split into a small public API and an internal compiler/matcher pipeline.
1) Builder
Routes are added to `RouterBuilder` using structured `RoutePattern` segments. The builder assigns parameter key ids and collects handler bindings.
2) Compile / freeze
Routes are compiled into a graph and then frozen into immutable arrays. The compile pipeline lives in `dev.relism.fpr.core.internal.compile`:
- `RouteCompiler` orchestrates the process.
- `RouteGraph` is the intermediate state/edge graph.
- `FreezeWriter` emits primitive arrays and the blob.
- `IndexBuilder` builds per-state first-byte indexes.
3) Match
Matching walks the input path by segments, compares bytes, and records param spans in a reusable `MatchResult` container. Runtime pieces live in `dev.relism.fpr.core.internal.runtime`:
- `FrozenRouter` is the match loop and state transitions.
- `EdgeDispatch` selects candidate edges for a state.
- `SegmentMatcher` evaluates a single segment (literal/mixed/param/wild).
- `ByteCompare` performs bulk byte comparisons.
No Strings or Maps are created during matching.
If you need params as name/value pairs, `MatchResult.forEachParam` can stream spans via `ParamConsumer` without allocations.