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22 lines
1.4 KiB
Plaintext
22 lines
1.4 KiB
Plaintext
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chapter.of: Extending the Store
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created: 20140710184940308
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modified: 20140717180902471
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sub.num: 2
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tags: doc new
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title: Caching
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The core plug-in adds two caches to the wiki store.
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A global cache and a cache for each tiddler.
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While the global cache is cleared whenever any tiddler changes, the tiddler cache is only cleared when the associated tiddler changes.
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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.
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Imagine a tiddler which contains links to other tiddlers and at one point we want to have a list of the linked tiddlers (LinksFilter).
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With the tiddler cache we can parse the WikiText, extract the linked tiddlers and put this list in the cache.
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Until the tiddler is changed, the cache can be used to access this information in the next requests.
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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.
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This list can be put in the global cache for later reuse until something changes in the store.
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Like the [[Event Mechanism]], the cache needs hook functions in the microkernel.
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The microkernel calls ``clearGlobalCache()`` and ``clearCache(tiddlertitle)`` when a tiddler changes.
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The core's cache mechanism overwrites this functions.
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The functions providing the cache system are added via the [[wikimethod module type]].
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