ExSQL.Codegen.Cache (exsql v0.2.2)

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Shape-keyed cache + compile gate for ExSQL.Codegen.

Maps a query shape (the param-lifted IR — same shape for any literal values) to either a sighting count or a compiled module. A shape is only compiled once it has been seen threshold times (default 2): one-shot ad-hoc queries never pay the compile cost, while repeated/prepared queries amortize it. The compiled modules are global (a Module.create side effect), so the cache lives in a :public ETS table owned by this process — like ExSQL.Registry.

Summary

Functions

child_spec(init_arg)

Returns a specification to start this module under a supervisor.

fetch(shape_key)

Records a sighting of shape_key and decides what to do

start_link(opts \\ [])
store(shape_key, module)

Stores the compiled module for a shape (subsequent fetch/1 returns {:hit, module}).

Functions

child_spec(init_arg)

Returns a specification to start this module under a supervisor.

See Supervisor.

fetch(shape_key)

@spec fetch(term()) :: {:hit, module()} | {:compile, pos_integer()} | :too_few

Records a sighting of shape_key and decides what to do:

  • {:hit, module} — already compiled, run it.
  • {:compile, n} — seen enough times; the caller should compile + store/2.
  • :too_few — not seen enough yet; fall back to the tree walker this time.

start_link(opts \\ [])

store(shape_key, module)

@spec store(term(), module()) :: :ok

Stores the compiled module for a shape (subsequent fetch/1 returns {:hit, module}).