Source file gather_switch.ml
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open! Core
open! Bonsai_private_base.Import
open! Bonsai_private_base
open Incr.Let_syntax
let f ~gather ~recursive_scopes ~time_source ~match_ ~arms ~here =
let wrap_switch ~branch ~type_id inject = Action.switch ~branch ~type_id >>> inject in
let%bind.Trampoline gathered =
Trampoline.all_map (Map.map arms ~f:(gather ~recursive_scopes ~time_source))
in
let may_contain =
Map.fold
gathered
~init:(May_contain.Unresolved.non_recursive ~path:No ~lifecycle:No ~input:No)
~f:(fun ~key:_ ~data:(Computation.T gathered) acc ->
May_contain.Unresolved.merge acc gathered.may_contain)
in
let run ~environment ~fix_envs ~path ~model ~inject =
let resolved = Environment.Recursive.resolve_may_contain fix_envs may_contain in
let path_needs_disambiguation =
let num_contain_path =
Map.count gathered ~f:(fun (T { may_contain; _ }) ->
match Environment.Recursive.resolve_may_contain fix_envs may_contain with
| { path = Yes_or_maybe; _ } -> true
| { path = No; _ } -> false)
in
num_contain_path > 1
in
annotate ~here Switch_model model;
let index = Value.eval environment match_ in
let result_input_and_lifecycle =
let%bind index in
let path =
if path_needs_disambiguation
then Path.append path (Path.Elem.Switch index)
else path
in
let (T
{ model = model_info
; input = input_info
; action = action_info
; apply_action = _
; reset = _
; may_contain = _
; run
})
=
Map.find_exn gathered index
in
let chosen_model =
Incremental.map model ~f:(fun map ->
let (Meta.Model.Hidden.T { model; info }) =
Meta.Multi_model.find_exn map index
in
let equal =
Meta.Model.Type_id.same_witness_exn info.type_id model_info.type_id
in
Type_equal.conv equal model)
in
let snapshot, () =
run
~environment
~fix_envs
~model:chosen_model
~path
~inject:(wrap_switch ~type_id:action_info ~branch:index inject)
|> Trampoline.run
in
let input =
let%mapn input = Input.to_incremental (Snapshot.input snapshot) in
Meta.Input.Hidden.T { input; type_id = input_info; key = index }
in
Incr.return
(Snapshot.result snapshot, input, Snapshot.lifecycle_or_empty ~here snapshot)
in
let result = Incr.bind result_input_and_lifecycle ~f:Tuple3.get1
and input = Incr.bind result_input_and_lifecycle ~f:Tuple3.get2
and lifecycle = Incr.bind result_input_and_lifecycle ~f:Tuple3.get3 in
let lifecycle =
match resolved.lifecycle with
| No -> None
| Yes_or_maybe -> Some lifecycle
in
let input =
match resolved.input with
| Yes_or_maybe -> Input.dynamic input
| No -> Input.static_dummy_for_switch
in
Trampoline.return (Snapshot.create ~here ~result ~input ~lifecycle, ())
in
let apply_action
~inject
~schedule_event
input
model
(Action.Switch { action; type_id = action_type_id; branch = index })
=
let (T
{ model = tm
; input = im
; action = am
; apply_action
; run = _
; reset = _
; may_contain = _
})
=
Map.find_exn gathered index
in
let (T { model = chosen_model; info = chosen_model_info; _ }) =
Meta.Multi_model.find_exn model index
in
match
( Action.Type_id.same_witness action_type_id am
, Meta.Model.Type_id.same_witness chosen_model_info.type_id tm.type_id )
with
| Some T, Some T ->
let new_model =
match input with
| Computation_status.Active
(Meta.Input.Hidden.T
{ input = chosen_input; type_id = chosen_input_info; key = index' }) ->
(match index = index', Meta.Input.same_witness chosen_input_info im with
| true, Some T ->
apply_action
~inject:(wrap_switch ~type_id:am ~branch:index inject)
~schedule_event
(Active chosen_input)
chosen_model
action
| _ ->
apply_action
~inject:(wrap_switch ~type_id:am ~branch:index inject)
~schedule_event
Inactive
chosen_model
action)
| Inactive ->
apply_action
~inject:(wrap_switch ~type_id:am ~branch:index inject)
~schedule_event
Inactive
chosen_model
action
in
let new_model = Meta.Model.Hidden.create tm new_model in
Meta.Multi_model.set model ~key:index ~data:new_model
| None, None | Some T, None | None, Some T ->
let action = Action.Type_id.to_sexp action_type_id action in
Ui_metrics.Counters.observe Bonsai_switch_action_dropped;
eprint_s
[%message
"an action inside of Bonsai.switch has been dropped because the computation is \
no longer active"
(index : int)
(action : Sexp.t)];
model
in
let reset ~inject ~schedule_event model =
let f ~key:index ~data:(model : Meta.Model.Hidden.t) =
let (T { model = chosen_model; info = chosen_model_info; _ }) = model in
let (T
{ model = tm
; input = _
; action = am
; reset
; apply_action = _
; may_contain = _
; run = _
})
=
Map.find_exn gathered index
in
let T = Meta.Model.Type_id.same_witness_exn tm.type_id chosen_model_info.type_id in
let new_model =
reset
~inject:(wrap_switch ~type_id:am ~branch:index inject)
~schedule_event
chosen_model
in
Meta.Model.Hidden.create tm new_model
in
Meta.Multi_model.of_models (Map.mapi (Meta.Multi_model.to_models model) ~f)
in
let model =
let models =
Map.map gathered ~f:(fun (T { model; _ }) ->
Meta.Model.Hidden.create model model.default)
in
Meta.Multi_model.model_info (Meta.Multi_model.of_models models)
in
Trampoline.return
(Computation.T
{ model
; input = Meta.Input.Hidden.int
; action = Action.Type_id.switch
; apply_action
; reset
; run
; may_contain
})
;;