DiskDataCacheProvider

QuantConnect.Data.DiskDataCacheProvider

DiskDataCacheProvider()

DiskDataCacheProvider(locker: KeyStringSynchronizer)

Bases: Object, IDataCacheProvider

Simple data cache provider, writes and reads directly from disk Used as default for LeanDataWriter

Signature descriptions:

• Creates a new instance

• Creates a new instance using the given synchronizer

Parameters:

Name	Type	Description	Default
locker	Optional[KeyStringSynchronizer]	The synchronizer instance to use	None

is_data_ephemeral

is_data_ephemeral: bool

Property indicating the data is temporary in nature and should not be cached.

dispose

dispose() -> None

Dispose for this class

fetch

fetch(key: str) -> Stream

Fetch data from the cache

Parameters:

Name	Type	Description	Default
key	str	A string representing the key of the cached data	required

Returns:

Type	Description
Stream	An Stream of the cached data.

get_zip_entries

get_zip_entries(zip_file: str) -> List[str]

Returns a list of zip entries in a provided zip file

store

store(key: str, data: List[int]) -> None

Store the data in the cache. Not implemented in this instance of the IDataCacheProvider

Parameters:

Name	Type	Description	Default
key	str	The source of the data, used as a key to retrieve data in the cache	required
data	List[int]	The data as a byte array	required