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# locking
# `prefect_redis.locking`
## Classes
### `RedisLockManager`
A lock manager that uses Redis as a backend.
**Attributes:**
* `host`: The host of the Redis server
* `port`: The port the Redis server is running on
* `db`: The database to write to and read from
* `username`: The username to use when connecting to the Redis server
* `password`: The password to use when connecting to the Redis server
* `ssl`: Whether to use SSL when connecting to the Redis server
* `client`: The Redis client used to communicate with the Redis server
* `async_client`: The asynchronous Redis client used to communicate with the Redis server
**Methods:**
#### `aacquire_lock`
```python theme={null}
aacquire_lock(self, key: str, holder: str, acquire_timeout: Optional[float] = None, hold_timeout: Optional[float] = None) -> bool
```
Acquires a lock asynchronously.
**Args:**
* `key`: Unique identifier for the transaction record.
* `holder`: Unique identifier for the holder of the lock. Must match the
holder provided when acquiring the lock.
* `acquire_timeout`: Maximum time to wait for the lock to be acquired.
* `hold_timeout`: Maximum time to hold the lock.
**Returns:**
* True if the lock was acquired, False otherwise.
#### `acquire_lock`
```python theme={null}
acquire_lock(self, key: str, holder: str, acquire_timeout: Optional[float] = None, hold_timeout: Optional[float] = None) -> bool
```
Acquires a lock synchronously.
**Args:**
* `key`: Unique identifier for the transaction record.
* `holder`: Unique identifier for the holder of the lock.
* `acquire_timeout`: Maximum time to wait for the lock to be acquired.
* `hold_timeout`: Maximum time to hold the lock.
**Returns:**
* True if the lock was acquired, False otherwise.
#### `await_for_lock`
```python theme={null}
await_for_lock(self, key: str, timeout: Optional[float] = None) -> bool
```
#### `is_lock_holder`
```python theme={null}
is_lock_holder(self, key: str, holder: str) -> bool
```
#### `is_locked`
```python theme={null}
is_locked(self, key: str) -> bool
```
#### `release_lock`
```python theme={null}
release_lock(self, key: str, holder: str) -> None
```
Releases the lock on the corresponding transaction record.
Handles the case where a lock might have been released during a task retry
If the lock doesn't exist in Redis at all, this method will succeed even if
the holder ID doesn't match the original holder.
**Args:**
* `key`: Unique identifier for the transaction record.
* `holder`: Unique identifier for the holder of the lock. Must match the
holder provided when acquiring the lock.
**Raises:**
* `ValueError`: If the lock is held by a different holder.
#### `wait_for_lock`
```python theme={null}
wait_for_lock(self, key: str, timeout: Optional[float] = None) -> bool
```
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