mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-17 23:34:50 +00:00
22 lines
1.4 KiB
Plaintext
22 lines
1.4 KiB
Plaintext
|
chapter.of: Extending the Store
|
||
|
|
created: 20140710184940308
|
||
|
|
modified: 20140717180902471
|
||
|
|
sub.num: 2
|
||
|
|
tags: doc new
|
||
|
|
title: Caching
|
||
|
|
|
||
|
|
The core plug-in adds two caches to the wiki store.
|
||
|
|
A global cache and a cache for each tiddler.
|
||
|
|
While the global cache is cleared whenever any tiddler changes, the tiddler cache is only cleared when the associated tiddler changes.
|
||
|
|
The idea of the tiddler cache is, that sometimes we want to calculate information from a tiddler but don't want to recalculate every time we need this information.
|
||
|
|
Imagine a tiddler which contains links to other tiddlers and at one point we want to have a list of the linked tiddlers (LinksFilter).
|
||
|
|
With the tiddler cache we can parse the WikiText, extract the linked tiddlers and put this list in the cache.
|
||
|
|
Until the tiddler is changed, the cache can be used to access this information in the next requests.
|
||
|
|
|
||
|
|
The same idea holds for the global cache. For example when a [[filter|Tags and Filter Mechanism]] string is parsed and a list of matching tiddlers is constructed.
|
||
|
|
This list can be put in the global cache for later reuse until something changes in the store.
|
||
|
|
|
||
|
|
Like the [[Event Mechanism]], the cache needs hook functions in the microkernel.
|
||
|
|
The microkernel calls ``clearGlobalCache()`` and ``clearCache(tiddlertitle)`` when a tiddler changes.
|
||
|
|
The core's cache mechanism overwrites this functions.
|
||
|
|
The functions providing the cache system are added via the [[wikimethod module type]].
|