Class: Rigor::Environment::ConstantTypeCacheHolder

Inherits:
Object
  • Object
show all
Defined in:
lib/rigor/environment/constant_type_cache_holder.rb

Overview

Per-key memoization container for #constant_for_name. Held by Rigor::Environment so the otherwise-frozen instance can cache constant-resolution results on first access — the sibling of HktRegistryHolder, generalised from one slot to a name-keyed map.

Why this exists: ‘constant_for_name` is a pure function of its name for a given Environment (both the predefined-constant refinement table and the RBS loader’s constant table are fixed for the Environment’s lifetime), yet it is the hottest non-dispatch path on a large Rails app. ExpressionTyper#resolve_constant_name peels a lexical-candidate ladder per constant reference, so the same qualified names recur thousands of times across files — and each miss runs a ‘const_get` walk that raises + rescues `NameError` for every project-defined constant (the common case). Caching the result collapses the repeats to a hash lookup.

Caches ‘nil` results too (a name that resolves to no refined / RBS constant type stays unresolved for the run), so the const_get-and-rescue is paid at most once per distinct name.

Concurrency: single-threaded use only, the same discipline as HktRegistryHolder — the Ractor pool builds a per-worker Environment and the LSP single-publish invariant serialises the shared-Environment reader path. If a future caller introduces a multi-threaded reader against one Environment, the synchronisation belongs at that caller’s seam, not here.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ConstantTypeCacheHolder

Returns a new instance of ConstantTypeCacheHolder.



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# File 'lib/rigor/environment/constant_type_cache_holder.rb', line 32

def initialize
  @cache = {}
end

Instance Method Details

#fetch(key) ⇒ Object 



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# File 'lib/rigor/environment/constant_type_cache_holder.rb', line 36

def fetch(key)
  return @cache[key] if @cache.key?(key)

  @cache[key] = yield
end