LRU Cache for Image Data
glance.image_cache.
ImageCache
[source]¶Bases: object
Provides an LRU cache for image data.
cache_image_file
(image_id, image_file)[source]¶Cache an image file.
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Returns: | True if image file was cached, False otherwise |
cache_image_iter
(image_id, image_iter, image_checksum=None)[source]¶Cache an image with supplied iterator.
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Returns: | True if image file was cached, False otherwise |
clean
(stall_time=None)[source]¶Cleans up any invalid or incomplete cached images. The cache driver decides what that means…
configure_driver
()[source]¶Configure the driver for the cache and, if it fails to configure, fall back to using the SQLite driver which has no odd dependencies
delete_all_cached_images
()[source]¶Removes all cached image files and any attributes about the images and returns the number of cached image files that were deleted.
delete_all_queued_images
()[source]¶Removes all queued image files and any attributes about the images and returns the number of queued image files that were deleted.
delete_cached_image
(image_id)[source]¶Removes a specific cached image file and any attributes about the image
Parameters: | image_id – Image ID |
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delete_queued_image
(image_id)[source]¶Removes a specific queued image file and any attributes about the image
Parameters: | image_id – Image ID |
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get_caching_iter
(image_id, image_checksum, image_iter)[source]¶Returns an iterator that caches the contents of an image while the image contents are read through the supplied iterator.
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get_hit_count
(image_id)[source]¶Return the number of hits that an image has
Parameters: | image_id – Opaque image identifier |
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get_image_size
(image_id)[source]¶Return the size of the image file for an image with supplied identifier.
Parameters: | image_id – Image ID |
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get_queued_images
()[source]¶Returns a list of image IDs that are in the queue. The list should be sorted by the time the image ID was inserted into the queue.
is_cached
(image_id)[source]¶Returns True if the image with the supplied ID has its image file cached.
Parameters: | image_id – Image ID |
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is_queued
(image_id)[source]¶Returns True if the image identifier is in our cache queue.
Parameters: | image_id – Image ID |
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open_for_read
(image_id)[source]¶Open and yield file for reading the image file for an image with supplied identifier.
Parameters: | image_id – Image ID |
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