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# task_worker
# `prefect.task_worker`
## Functions
### `should_try_to_read_parameters`
```python theme={null}
should_try_to_read_parameters(task: Task[P, R], task_run: TaskRun) -> bool
```
Determines whether a task run should read parameters from the result store.
### `create_status_server`
```python theme={null}
create_status_server(task_worker: TaskWorker) -> FastAPI
```
### `aserve`
```python theme={null}
aserve(*tasks: Task[P, R]) -> None
```
Serve the provided tasks so that their runs may be submitted to
and executed in the engine. Tasks do not need to be within a flow run context to be
submitted. You must `.submit` the same task object that you pass to `serve`.
**Args:**
* `- tasks`: A list of tasks to serve. When a scheduled task run is found for a
given task, the task run will be submitted to the engine for execution.
* `- limit`: The maximum number of tasks that can be run concurrently. Defaults to 10.
Pass `None` to remove the limit.
* `- status_server_port`: An optional port on which to start an HTTP server
exposing status information about the task worker. If not provided, no
status server will run.
* `- timeout`: If provided, the task worker will exit after the given number of
seconds. Defaults to None, meaning the task worker will run indefinitely.
### `serve`
```python theme={null}
serve(*tasks: Task[P, R]) -> None
```
Serve the provided tasks so that their runs may be submitted to
and executed in the engine. Tasks do not need to be within a flow run context to be
submitted. You must `.submit` the same task object that you pass to `serve`.
**Args:**
* `- tasks`: A list of tasks to serve. When a scheduled task run is found for a
given task, the task run will be submitted to the engine for execution.
* `- limit`: The maximum number of tasks that can be run concurrently. Defaults to 10.
Pass `None` to remove the limit.
* `- status_server_port`: An optional port on which to start an HTTP server
exposing status information about the task worker. If not provided, no
status server will run.
* `- timeout`: If provided, the task worker will exit after the given number of
seconds. Defaults to None, meaning the task worker will run indefinitely.
### `store_parameters`
```python theme={null}
store_parameters(result_store: ResultStore, identifier: UUID, parameters: dict[str, Any]) -> None
```
Store parameters for a task run in the result store.
**Args:**
* `result_store`: The result store to store the parameters in.
* `identifier`: The identifier of the task run.
* `parameters`: The parameters to store.
### `read_parameters`
```python theme={null}
read_parameters(result_store: ResultStore, identifier: UUID) -> dict[str, Any]
```
Read parameters for a task run from the result store.
**Args:**
* `result_store`: The result store to read the parameters from.
* `identifier`: The identifier of the task run.
**Returns:**
* The parameters for the task run.
## Classes
### `StopTaskWorker`
Raised when the task worker is stopped.
### `TaskWorker`
This class is responsible for serving tasks that may be executed in the background
by a task runner via the traditional engine machinery.
When `start()` is called, the task worker will open a websocket connection to a
server-side queue of scheduled task runs. When a scheduled task run is found, the
scheduled task run is submitted to the engine for execution with a minimal `EngineContext`
so that the task run can be governed by orchestration rules.
**Args:**
* `- tasks`: A list of tasks to serve. These tasks will be submitted to the engine
when a scheduled task run is found.
* `- limit`: The maximum number of tasks that can be run concurrently. Defaults to 10.
Pass `None` to remove the limit.
**Methods:**
#### `astart`
```python theme={null}
astart(self, timeout: Optional[float] = None) -> None
```
Starts a task worker, which runs the tasks provided in the constructor.
**Args:**
* `timeout`: If provided, the task worker will exit after the given number of
seconds. Defaults to None, meaning the task worker will run indefinitely.
#### `astop`
```python theme={null}
astop(self) -> None
```
Stops the task worker's polling cycle.
#### `available_tasks`
```python theme={null}
available_tasks(self) -> Optional[int]
```
#### `client_id`
```python theme={null}
client_id(self) -> str
```
#### `current_tasks`
```python theme={null}
current_tasks(self) -> Optional[int]
```
#### `execute_task_run`
```python theme={null}
execute_task_run(self, task_run: TaskRun) -> None
```
Execute a task run in the task worker.
#### `handle_sigterm`
```python theme={null}
handle_sigterm(self, signum: int, frame: object) -> None
```
Shuts down the task worker when a SIGTERM is received.
#### `limit`
```python theme={null}
limit(self) -> Optional[int]
```
#### `start`
```python theme={null}
start(self, timeout: Optional[float] = None) -> None
```
Starts a task worker, which runs the tasks provided in the constructor.
**Args:**
* `timeout`: If provided, the task worker will exit after the given number of
seconds. Defaults to None, meaning the task worker will run indefinitely.
#### `started`
```python theme={null}
started(self) -> bool
```
#### `started_at`
```python theme={null}
started_at(self) -> Optional[DateTime]
```
#### `stop`
```python theme={null}
stop(self) -> None
```
Stops the task worker's polling cycle.
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