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MINOR Documentation for Aggregate caching (from r114077)

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git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/branches/2.4@114078 467b73ca-7a2a-4603-9d3b-597d59a354a9
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Ingo Schommer 2010-11-23 05:45:21 +00:00 committed by Sam Minnee
parent 1544d55890
commit 253083bc81
1 changed files with 6 additions and 1 deletions
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7
core/model/Aggregate.php
View File

@ -20,7 +20,11 @@
* examples: Min, Max, Avg
*
* Aggregates are often used as portions of a cacheblock key. They are therefore cached themselves, in the 'aggregate'
* cache, although the invalidation logic prefers speed over keeping valid data.
* cache, although the invalidation logic prefers speed over keeping valid data.
* The aggregate cache is cleared through {@link DataObject::flushCache()}, which in turn is called on
* {@link DataObject->write()} and other write operations.
* This means most write operations to the database will invalidate the cache correctly.
* Use {@link Aggregate::flushCache()} to manually clear.
*
* NOTE: The cache logic uses tags, and so a backend that supports tags is required. Currently only the File
* backend (and the two-level backend with the File backend as the slow store) meets this requirement
@ -98,6 +102,7 @@ class Aggregate extends ViewableData {
$query = $this->query("$func(\"$table\".\"$attribute\")");
// Cache results of this specific SQL query until flushCache() is triggered.
$cachekey = sha1($query->sql());
$cache = self::cache();