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module type STORAGE = sig
type connection
type transaction
type address = Label of string | Hash of Concepts.Hash.hash
val connect : Concepts.Configuration.term -> (connection, Concepts.Condition.condition) result
(** close `connection`, after which none of its transactions may be used *)
val disconnect : connection -> unit
(** begin a transaction within `connection` *)
val start : connection -> (transaction, Concepts.Condition.condition) result
(** begin a read-only transaction, which may be held alongside others *)
val start_read : connection -> (transaction, Concepts.Condition.condition) result
(** `commit` the current transaction *)
val commit : transaction -> (unit, Concepts.Condition.condition) result
(** `abort` the current transaction *)
val abort : transaction -> (unit, Concepts.Condition.condition) result
(** within a transaction, fetch a blob from disk *)
val get : transaction -> address -> (Concepts.Blob.t option, Concepts.Condition.condition) result
(** within a transaction, associate a hash with a blob on disk *)
val put : transaction -> address -> Concepts.Blob.t -> (unit, Concepts.Condition.condition) result
end
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