Aaron Schulz has uploaded a new change for review. (
https://gerrit.wikimedia.org/r/395690 )
Change subject: objectcache: add another example case to
WANObjectCache::getWithSetCallback()
......................................................................
objectcache: add another example case to WANObjectCache::getWithSetCallback()
Change-Id: I4beb1441790f5371d9fe55ca05cd17dc9fcdcf80
---
M includes/libs/objectcache/WANObjectCache.php
1 file changed, 31 insertions(+), 0 deletions(-)
git pull ssh://gerrit.wikimedia.org:29418/mediawiki/core
refs/changes/90/395690/1
diff --git a/includes/libs/objectcache/WANObjectCache.php
b/includes/libs/objectcache/WANObjectCache.php
index 8f2c72a..80ea87d 100644
--- a/includes/libs/objectcache/WANObjectCache.php
+++ b/includes/libs/objectcache/WANObjectCache.php
@@ -901,6 +901,37 @@
* );
* @endcode
*
+ * Example usage (key holding an LRU subkey:value map without
per-subkey TTLs)
+ * @code
+ * $commonCatScenarioChecks = $this->cache->getWithSetCallback(
+ * $this->cache->makeKey( 'cat-constraint-checks',
$constraintId ),
+ * WANObjectCache::TTL_DAY,
+ * function ( $cacheMap ) use ( $constraintId, $hashOfScenario,
$scenario ) {
+ * $lruCache = MapCacheLRU::newFromArray( $cacheMap ?: [],
self::CACHE_SIZE );
+ * if ( $lruCache->has( $hashOfScenario ) ) {
+ * $lruCache->get( $hashOfScenario ); // trigger LRU
bump
+ * } else {
+ * $result = $this->checkAgainstContraint(
$constraintId, $scenario );
+ * $lruCache->set( $hashOfScenario, $result, 3 / 8 );
+ * }
+ * // Save the new LRU cache map and reset the TTL
+ * return $lruCache->toArray();
+ * },
+ * [
+ * // Once map is > 1 sec old, consider refreshing
+ * 'ageNew' => 1,
+ * // Update 5 seconds after "ageNew" given a 1 query/sec
cache check rate
+ * 'hotTTR' => 5,
+ * // Avoid querying cache servers multiple times in a
request; this also means
+ * // that a request can only alter the value of any given
constraint key once
+ * 'pcTTL' => WANObjectCache::TTL_PROC_LONG,
+ * ]
+ * );
+ * $checkResult = isset( $commonCatScenarioChecks[ $hashOfScenario
] )
+ * ? $commonCatScenarioChecks[ $hashOfScenario ]
+ * : $this->checkAgainstContraint( $constraintId, $scenario );
+ * @endcode
+ *
* @see WANObjectCache::get()
* @see WANObjectCache::set()
*
--
To view, visit https://gerrit.wikimedia.org/r/395690
To unsubscribe, visit https://gerrit.wikimedia.org/r/settings
Gerrit-MessageType: newchange
Gerrit-Change-Id: I4beb1441790f5371d9fe55ca05cd17dc9fcdcf80
Gerrit-PatchSet: 1
Gerrit-Project: mediawiki/core
Gerrit-Branch: master
Gerrit-Owner: Aaron Schulz <asch...@wikimedia.org>
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