Cache manager¶

The cache manager can be used to store python objects attached to a unique key. The cache can be controlled in two ways: with a object limit or a timeout.

For example, we can create a new cache with a limit of 10 objects and a timeout of 5 seconds:

# register a new Cache
Cache.register('mycache', limit=10, timeout=5)

# create an object + id
key = 'objectid'
instance = Label(text=text)
Cache.append('mycache', key, instance)

# retrieve the cached object
instance = Cache.get('mycache', key)

If the instance is NULL, the cache may have trashed it because you’ve not used the label for 5 seconds and you’ve reach the limit.

class kivy.cache.Cache[source]¶

Bases: builtins.object

See module documentation for more information.

static append(category, key, obj, timeout=None)[source]¶

Add a new object to the cache.

Parameters:

category: str: Identifier of the category.
key: str: Unique identifier of the object to store.
obj: object: Object to store in cache.
timeout: double (optional): Time after which to delete the object if it has not been used. If None, no timeout is applied.

Raises:

ValueError: If None is used as key.

Changed in version 2.0.0: Raises ValueError if None is used as key.

static get(category, key, default=None)[source]¶

Get a object from the cache.

Parameters:

category: str: Identifier of the category.
key: str: Unique identifier of the object in the store.
default: anything, defaults to None: Default value to be returned if the key is not found.

static get_lastaccess(category, key, default=None)[source]¶

Get the objects last access time in the cache.

Parameters:

category: str: Identifier of the category.
key: str: Unique identifier of the object in the store.
default: anything, defaults to None: Default value to be returned if the key is not found.

static get_timestamp(category, key, default=None)[source]¶

Get the object timestamp in the cache.

Parameters:

category: str: Identifier of the category.
key: str: Unique identifier of the object in the store.
default: anything, defaults to None: Default value to be returned if the key is not found.

static print_usage()[source]¶: Print the cache usage to the console.

static register(category, limit=None, timeout=None)[source]¶

Register a new category in the cache with the specified limit.

Parameters:

category: str: Identifier of the category.
limit: int (optional): Maximum number of objects allowed in the cache. If None, no limit is applied.
timeout: double (optional): Time after which to delete the object if it has not been used. If None, no timeout is applied.

static remove(category, key=None)[source]¶

Purge the cache.

Parameters:

category: str: Identifier of the category.
key: str (optional): Unique identifier of the object in the store. If this argument is not supplied, the entire category will be purged.

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Cache manager¶