package irmin

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package irmin
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CONTENT_ADDRESSABLE_STOREMAKER is the signature exposed by content-addressable store backends. K is the implementation of keys and V is the implementation of values.

Parameters

module K : Hash.S
module V : Type.S

Signature

include CONTENT_ADDRESSABLE_STORE with type key = K.t and type value = V.t

Content-addressable stores

Content-addressable stores are store where it is possible to read and add new values. Keys are derived from the values raw contents and hence are deterministic.

type 'a t

The type for content-addressable backend stores. The 'a phantom type carries information about the store mutability.

type key = K.t

The type for keys.

type value = V.t

The type for raw values.

val mem : [> `Read ] t -> key -> bool Lwt.t

mem t k is true iff k is present in t.

val find : [> `Read ] t -> key -> value option Lwt.t

find t k is Some v if k is associated to v in t and None is k is not present in t.

val add : [> `Write ] t -> value -> key Lwt.t

Write the contents of a value to the store. It's the responsibility of the content-addressable store to generate a consistent key.

val unsafe_add : [> `Write ] t -> key -> value -> unit Lwt.t

Same as add but allows to specify the key directly. The backend might choose to discared that key and/or can be corrupt if the key scheme is not consistent.

val batch : [ `Read ] t -> ([ `Read | `Write ] t -> 'a Lwt.t) -> 'a Lwt.t

batch t f applies the writes in f in a separate batch. The exact guarantees depends on the backends.

val v : config -> [ `Read ] t Lwt.t

v config is a function returning fresh store handles, with the configuration config, which is provided by the backend.

val close : 'a t -> unit Lwt.t

close t frees up all the resources associated to t. Any operations run on a closed store will raise Closed.