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37 lines
1.3 KiB
Markdown
37 lines
1.3 KiB
Markdown
# Custom cache storage layers
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As an alternative to using the default file-based caching mechanism, you
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can specify a custom cache implementation that will be used to read,
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write and clear cached files.
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With a custom cache implementation you could replace the slow filesystem by a
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faster storage engine, centralize the cache to be accessible to multiple
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servers.
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Smarty requires implementations to extend `\Smarty\Cacheresource\Base`, but encourages you to either extend
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`\Smarty\Cacheresource\Custom` or `\Smarty\Cacheresource\KeyValueStore`.
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- `\Smarty\Cacheresource\Custom` is a simple API directing all read, write,
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clear calls to your implementation. This API allows you to store
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wherever and however you deem fit.
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- `\Smarty\Cacheresource\KeyValueStore` allows you to turn any
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KeyValue-Store (like APC or Memcache) into a full-featured
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CacheResource implementation. Everything around deep
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cache-groups like "a|b|c" is being handled for you in a way that
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guarantees clearing the cache-group "a" will clear all nested groups
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as well - even though KeyValue-Stores don't allow this kind of
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hierarchy by nature.
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Custom CacheResources must be registered on
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runtime with `Smarty\Smarty::setCacheResource()`:
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```php
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<?php
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use Smarty\Smarty;
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$smarty = new Smarty();
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$smarty->setCacheResource(new My_CacheResource_Mysql());
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```
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