def snapshot.root.value.length.dispatch

mylsm-lsm-store@0.6.0.1 · src/ByteDurableDb.bend:3065

import Base
import mylsm-lsm-store@0.6.0.1/src/ByteMemTable.bend as ByteMemTable
import mylsm-lsm-store@0.6.0.1/src/coordinator/SnapshotValueLengthPolicy.bend as SnapshotValueLengthPolicy
import bend-kit-bytes@0.3.2.0/bytes.bend as Bytes

3065def snapshot.root.value.length.dispatch(
3066  root: SnapshotRoot,
3067  +probe: ByteMemTable.LengthProbe,
3068  key: Bytes.Bytes,
3069  decision: SnapshotValueLengthPolicy.Decision
3070) -> IO(Result<&1, &1, Error, Maybe<&1, U32>>):
3071  match root:
3072    case SnapshotRoot{sst_path, _, _, _}:
3073      match decision:
3074        case SnapshotValueLengthPolicy.NeedSst{}:
3075          snapshot.root.value.length.metadata.read(sst_path, probe, key)
3076        case SnapshotValueLengthPolicy.Missing{}:
3077          IO.pure(Result<&1, &1, Error, Maybe<&1, U32>>, Done{None{}})
3078        case SnapshotValueLengthPolicy.Found{value_bytes}:
3079          IO.pure(Result<&1, &1, Error, Maybe<&1, U32>>,
3080            Done{Some{value_bytes}})