| Safe Haskell | Safe-Infered |
|---|
Database.Redis.Tags
Contents
Description
Hedis tags helper.
- markTags :: [ByteString] -> ByteString -> [ByteString] -> Redis ()
- purgeTags :: ByteString -> [ByteString] -> Redis ()
- nestTags :: [ByteString] -> [ByteString]
- reconsileTags :: ByteString -> Redis ()
Tagging
Arguments
| :: [ByteString] | Keys. |
| -> ByteString | Prefix for tags. |
| -> [ByteString] | Tags. To make list of nested tags use |
| -> Redis () |
Mark keys with tags. Keys may be absent. All tags named in next manner:
tag-prefix:tag:tag-signature
Tags stored in Redis as sets with no expiration. Tags not related to each other.
Time complexity O(K+T) where K and T is number of keys and tags.
Arguments
| :: ByteString | Prefix for tags. |
| -> [ByteString] | Tags. To make list of nested tags use |
| -> Redis () |
Purge tagged keys and tags.
Because the tags are not related to each other, if key tagged with more
than one tags, remember the following. After removal of one of the tags,
may remain orphans. To avoid this, purge all needed tags or use
reconcileTags for stripping.
Time complexity ~O(T+2K) where T is number tags and K is number
of tagged keys.
nestTags :: [ByteString] -> [ByteString]Source
Helper for create list of nested tags.
nestTags ["one", "two", "three"] ["one", "one:two", "one:two:three"]
Maintenance
Arguments
| :: ByteString | Tags prefix. |
| -> Redis () |
Reconcile all tags with given prefix.
- Remove noexistent keys from tags.
- Remove empty tags.
This operation take huge time complexity. Use it only for maintenance.