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add tasks that can run in parallel, typically preceding an action #303

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add tasks that can run in parallel, typically preceding an action
heindel Dec 31, 2024
e787bb4
Fix issues detected by pre-commit
Dec 31, 2024
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47 changes: 46 additions & 1 deletion docs/arch/node/types/engine_behaviour.juvix.md
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Expand Up @@ -156,12 +156,57 @@ type ActionEffect (S B H AM AC AE : Type) :=
```
<!-- --8<-- [end:ActionEffect] -->

### `Task`

Each action may involve several _tasks_
that can be executed in parallel.
To enable for the parallelism,
tasks can only operate on mailboxes.

<!-- --8<-- [start:TaskInput] -->
```juvix
type TaskInput (C B H A AM : Type) :=
mkTaskInput {
args : A;
cfg : EngineCfg C;
mailbox : Pair MailboxID (Mailbox B AM);
trigger : TimestampedTrigger H AM;
};
```
<!-- --8<-- [end:TaskInput] -->

### `TaskEffect`

A task affects only its mailbox state and not the whole environment.

<!-- --8<-- [start:TaskEffect] -->
```juvix
type TaskEffect (B H AM AC AE : Type) :=
mkTaskEffect@{
mailbox : Mailbox B AM;
msgs : List (EngineMsg AM);
timers : List (Timer H);
engines : List (Pair AC AE);
};
```
<!-- --8<-- [end:TaskEffect] -->

<!-- --8<-- [start:TaskFunction] -->
```juvix
{-# isabelle-ignore: true #-} -- TODO: remove this when the compiler is fixed
Task (C B H A AM AC AE : Type) : Type :=
(input : TaskInput C B H A AM) ->
Option (TaskEffect B H AM AC AE);
```
<!-- --8<-- [end:TaskFunction] -->

### `ActionExec`

<!-- --8<-- [start:ActionExec] -->
```juvix
type ActionExec (C S B H A AM AC AE : Type) :=
| Seq (List (Action C S B H A AM AC AE))
| Seq (List (Action C S B H A AM AC AE)) -- deprecated
| Par (List (Task C B H A AM AC AE)) (Action C S B H A AM AC AE)
;
```
<!-- --8<-- [end:ActionExec] -->
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