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bDS2/specs/task.allium
2026-04-23 10:42:27 +02:00

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-- allium: 1
-- bDS Background Task Manager
-- Scope: core (Wave 1)
-- Distilled from: src/main/engine/TaskManager.ts
entity Task {
name: String
status: pending | running | completed | failed | cancelled
progress: Decimal? -- 0.0..1.0
message: String?
group_id: String? -- Optional task grouping
group_name: String?
created_at: Timestamp
transitions status {
pending -> running
running -> completed
running -> failed
running -> cancelled
}
}
surface TaskControlSurface {
facing _: TaskOperator
provides:
SubmitTaskRequested(name, work)
CancelTaskRequested(task)
RegisterExternalTaskRequested(name)
}
surface TaskRuntimeSurface {
facing _: TaskRuntime
provides:
TaskWorkCompleted(task)
TaskWorkFailed(task, error_message)
ProgressReported(task, value, message)
}
surface TaskSurface {
context task: Task
exposes:
task.name
task.status
task.progress when task.progress != null
task.message when task.message != null
task.group_id when task.group_id != null
task.group_name when task.group_name != null
task.created_at
}
config {
max_concurrent: Integer = 3
progress_throttle: Duration = 250.milliseconds
}
invariant MaxConcurrency {
-- At most max_concurrent tasks run simultaneously
let running_tasks = Tasks where status = running
running_tasks.count <= config.max_concurrent
}
invariant FifoQueue {
-- When max concurrent reached, new tasks queue in FIFO order
-- Queued tasks transition to running as slots open
}
rule SubmitTask {
when: SubmitTaskRequested(name, work)
let running_tasks = Tasks where status = running
ensures:
let task = Task.created(name: name, status: pending)
task.status = pending
if running_tasks.count < config.max_concurrent:
task.status = running
TaskStarted(task, work)
}
rule CompleteTask {
when: TaskWorkCompleted(task)
ensures: task.status = completed
ensures: task.progress = 1.0
ensures: NextQueuedTaskStarted()
}
rule FailTask {
when: TaskWorkFailed(task, error_message)
ensures: task.status = failed
ensures: task.message = error_message
ensures: NextQueuedTaskStarted()
}
rule CancelTask {
when: CancelTaskRequested(task)
requires: task.status = running or task.status = pending
-- Cancellation uses a runtime-specific cancellation mechanism
ensures: task.status = cancelled
ensures: NextQueuedTaskStarted()
}
rule ReportProgress {
when: ProgressReported(task, value, message)
-- Progress events throttled to 250ms
ensures: task.progress = value
ensures: task.message = message
}
invariant ProgressThrottled {
-- Progress update events are throttled to prevent UI flooding
-- At most one progress event per 250ms per task
}
-- External tasks: lifecycle controlled by caller (e.g., renderer-side scripts)
rule RegisterExternalTask {
when: RegisterExternalTaskRequested(name)
ensures:
let task = Task.created(name: name, status: running)
task.status = running
@guidance
-- External tasks are not managed by the queue
-- The caller is responsible for updating status
}