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-rw-r--r--lib/management/multigroup.ml59
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diff --git a/lib/management/multigroup.ml b/lib/management/multigroup.ml
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-(** Multigroup root: a lightweight versioned descriptor that maps relation names
- to content-addressed relation values. The multigroup object owns the B+ tree
- pointer and advances it when relations change. *)
-
-class multigroup ~name:(init_name : Conventions.Name.t) =
- object (_self)
- val name : Conventions.Name.t = init_name
- val relations : Relation.relation BatMap.String.t = BatMap.String.empty
- val timestamp : float = Unix.gettimeofday ()
- method name = name
- method relations = relations
- method timestamp = timestamp
-
- (* TODO: a variant returning (Relation.relation, Condition.t) result *)
- method get_relation rel_name = BatMap.String.find_opt rel_name relations
- method get_relation_names = BatMap.String.fold (fun n _ acc -> n :: acc) relations []
- method has_relation rel_name = BatMap.String.mem rel_name relations
-
- method add_relation (rel : Relation.relation) =
- {<relations = BatMap.String.add rel#name rel relations>}
-
- method remove_relation rel_name = {<relations = BatMap.String.remove rel_name relations>}
-
- method update_relation (rel : Relation.relation) =
- if not (BatMap.String.mem rel#name relations) then {<>}
- else {<relations = BatMap.String.add rel#name rel relations>}
-
- method serialize () : Storable.Multigroup.t =
- { Storable.Multigroup.name;
- relations=
- BatMap.String.bindings relations |> List.map snd |> List.map (fun r -> r#serialize ()) }
- end
-
-let deserialize (bytes : bytes) : (multigroup, string) result =
- (* Reconstruct a multigroup from its persisted payload.
- Only name, schema, and tree_pointer (Merkle root) are restored per
- relation. Constraints are not yet round-tripped — see the TODO in
- storable.ml for the constraint serialisation plan. *)
- try
- let stored = Storable.Multigroup.of_bytes bytes in
- let db = new multigroup ~name:stored.name in
- let db =
- List.fold_left
- (fun mg rel ->
- let relation =
- new Relation.stored
- ~name:rel.Storable.Relation.name ~schema:rel.schema ~constraints:None
- ~cardinality:Conventions.Cardinality.AlephZero ~lineage:None ~provenance:None
- ~membership_criteria:(fun _ -> true )
- in
- let relation =
- if rel.tree_pointer = "" then relation
- else relation#set_tree_pointer (Some rel.tree_pointer)
- in
- mg#add_relation (relation :> Relation.relation) )
- db stored.relations
- in
- Ok db
- with Invalid_argument message -> Error message