package irmin-pack

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in-package search v0.2.0

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Parameters
Signature

Package contains no libraries

Parameters

module CA : S

Signature

include S
  with type key = CA.key
   and type hash = CA.hash
   and type value = CA.value

include Irmin.Indexable.S
  with type key = CA.key
  with type hash = CA.hash
  with type value = CA.value

Read-only stores

Read-only stores are store where it is only possible to read existing values.

type -'a t

The type for stores. The 'a phantom type carries information about the store mutability.

type key = CA.key

The type for keys.

type value = CA.value

The type for raw values.

val mem : [> Irmin.Perms.read ] t -> key -> bool Lwt.t

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

val find : [> Irmin.Perms.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 close : 'a t -> unit Lwt.t

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

type hash = CA.hash

The type of hashes of value.

val index : [> Irmin.Perms.read ] t -> hash -> key option Lwt.t

Indexing maps the hash of a value to a corresponding key of that value in the store. For stores that are addressed by hashes directly, this is typically fun _t h -> Lwt.return (Key.of_hash h); for stores with more complex addressing schemes, index may attempt a lookup operation in the store.

In general, indexing is best-effort and reveals no information about the membership of the value in the store. In particular:

index t hash = Some key doesn't guarantee mem t key: the value with hash hash may still be absent from the store;

index t hash = None doesn't guarantee that there is no key such that mem t key and Key.to_hash key = hash: the value may still be present in the store under a key that is not indexed.

val batch : 
  Irmin.Perms.read t ->
  ([ Irmin.Perms.read | Irmin.Perms.write ] t -> 'a Lwt.t) ->
  'a Lwt.t

batch t f applies the writes in f in a separate batch. The exact guarantees depend on the implementation.

module Key : Irmin.Key.S with type t = key and type hash = hash

val add : 'a t -> value -> key Lwt.t

Overwrite add to work with a read-only database handler.

val unsafe_add : 'a t -> hash -> value -> key Lwt.t

Overwrite unsafe_add to work with a read-only database handler.

val index_direct : _ t -> hash -> key option

val unsafe_append : 
  ensure_unique:bool ->
  overcommit:bool ->
  'a t ->
  hash ->
  value ->
  key

val unsafe_mem : 'a t -> key -> bool

val unsafe_find : check_integrity:bool -> 'a t -> key -> value option

val make_closeable : 'a CA.t -> 'a t

val get_if_open_exn : 'a t -> 'a CA.t