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Hierarchical read-write stores

package irmin

irmin
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Legend:
Library
Module
Module type
Parameter
Class
Class type

Hierarchical read-write stores.

Hierarchical read-write stores

Hierarchical read-write stores are read-write stores using paths as keys. They are a very simplified abstraction of filesystems.

include RW

Read-write stores

include RO

Read-only stores

type t

Type for stores.

type key

Type for keys.

type value

Type for values.

val read : t -> key -> value option Lwt.t

Read a value from the store.

val read_exn : t -> key -> value Lwt.t

Same as read but raise Invalid_argument if the key does not exist.

val mem : t -> key -> bool Lwt.t

Check if a key exists.

val iter : t -> (key -> value Lwt.t -> unit Lwt.t) -> unit Lwt.t

iter t fn call the function fn on all t's keys and values.

val update : t -> key -> value -> unit Lwt.t

update t k v replaces the contents of k by v in t. If k is not already defined in t, create a fresh binding. Raise Invalid_argument if k is the empty path.

val compare_and_set : 
  t ->
  key ->
  test:value option ->
  set:value option ->
  bool Lwt.t

compare_and_set t key ~test ~set sets key to set only if the current value of key is test and in that case returns true. If the current value of key is different, it returns false. None means that the value does not have to exist or is removed.

Note: The operation is guaranteed to be atomic.

val remove : t -> key -> unit Lwt.t

remove t k remove the key k in t.

val list : t -> key -> key list Lwt.t

list t k list the sub-paths of the path k in t.

val remove_rec : t -> key -> unit Lwt.t

Same as RW.remove but removes all the sub-paths recursively.