package index

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Index

Index is a scalable implementation of persistent indices in OCaml.

Index provides the standard key-value interface: find, mem and replace. It requires three IO instances:

  • A `log` IO containing all of the recently-added bindings; this is also kept in memory.
  • When the `log` IO is full, it is merged into the `index` IO. Search is done first in `log` then in `index`, which makes recently added bindings search faster.
  • A `lock` IO to ensure safe concurrent access.
module type Key = sig ... end

The input of Make for keys.

module Private : sig ... end

These modules should not be used. They are exposed purely for testing purposes.

module type Value = sig ... end

The input of Make for values. The same requirements as for Key apply.

module type IO = sig ... end
exception RO_not_allowed

The exception raised when a write operation is attempted on a read_only index.

exception Closed

The exception raised when any operation is attempted on a closed index, except for close, which is idempotent.

module type S = sig ... end

Index module signature.

module Make (K : Key) (V : Value) (IO : IO) : S with type key = K.t and type value = V.t
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