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# __init__
# `prefect.server.events.ordering`
Manages the partial causal ordering of events for a particular consumer. This module
maintains a buffer of events to be processed, aiming to process them in the order they
occurred causally.
## Functions
### `get_triggers_causal_ordering`
```python theme={null}
get_triggers_causal_ordering() -> CausalOrdering
```
### `get_task_run_recorder_causal_ordering`
```python theme={null}
get_task_run_recorder_causal_ordering() -> CausalOrdering
```
## Classes
### `CausalOrderingModule`
### `EventArrivedEarly`
### `MaxDepthExceeded`
### `event_handler`
### `CausalOrdering`
**Methods:**
#### `event_has_been_seen`
```python theme={null}
event_has_been_seen(self, event: Union[UUID, Event]) -> bool
```
#### `forget_follower`
```python theme={null}
forget_follower(self, follower: ReceivedEvent) -> None
```
#### `get_followers`
```python theme={null}
get_followers(self, leader: ReceivedEvent) -> List[ReceivedEvent]
```
#### `get_lost_followers`
```python theme={null}
get_lost_followers(self) -> List[ReceivedEvent]
```
#### `preceding_event_confirmed`
```python theme={null}
preceding_event_confirmed(self, handler: event_handler, event: ReceivedEvent, depth: int = 0) -> AsyncContextManager[None]
```
#### `record_event_as_seen`
```python theme={null}
record_event_as_seen(self, event: ReceivedEvent) -> None
```
#### `record_follower`
```python theme={null}
record_follower(self, event: ReceivedEvent) -> None
```
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