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Merge pull request #2677 from chillu/pulls/zend-aggregate
Skip tags in Zend_Cache for Aggregate if not available, better docs
This commit is contained in:
Simon Welsh
commit
16fe87e4aa
103
cache/Cache.php
vendored
103
cache/Cache.php
vendored
@ -1,109 +1,10 @@
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<?php
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/**
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* SS_Cache provides a bunch of static functions wrapping the Zend_Cache system
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* The `[api:SS_Cache]` class provides a bunch of static functions wrapping the Zend_Cache system
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* in something a little more easy to use with the SilverStripe config system.
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*
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* A Zend_Cache has both a frontend (determines how to get the value to cache,
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* and how to serialize it for storage) and a backend (handles the actual
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* storage).
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*
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* Rather than require library code to specify the backend directly, cache
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* consumers provide a name for the cache backend they want. The end developer
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* can then specify which backend to use for each name in their project's
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* _config.php. They can also use 'all' to provide a backend for all named
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* caches.
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*
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* End developers provide a set of named backends, then pick the specific
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* backend for each named cache. There is a default File cache set up as the
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* 'default' named backend, which is assigned to 'all' named caches.
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*
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* <h2>Using a cache</h2>
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*
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* <code>
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* // foo is any name (try to be specific), and is used to get configuration
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* // & storage info
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* $cache = SS_Cache::factory('foo');
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*
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* if (!($result = $cache->load($cachekey))) {
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* $result = caluate some how;
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* $cache->save($result);
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* }
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*
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* return $result;
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* </code>
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*
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* Normally there's no need to remove things from the cache - the cache
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* backends clear out entries based on age & maximum allocated storage. If you
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* include the version of the object in the cache key, even object changes
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* don't need any invalidation.
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*
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* <h2>Disabling cache in dev mode</h2>
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*
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* <code>
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* // _config.php
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* if (Director::isDev()) {
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* SS_Cache::set_cache_lifetime('any', -1, 100);
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* //
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* </code>
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*
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* <h2>Using memcached as a store</h2>
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*
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* <code>
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* // _config.php
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* SS_Cache::add_backend(
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* 'primary_memcached',
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* 'Memcached',
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* array(
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* 'host' => 'localhost',
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* 'port' => 11211,
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* 'persistent' => true,
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* 'weight' => 1,
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* 'timeout' => 5,
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* 'retry_interval' => 15,
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* 'status' => true,
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* 'failure_callback' => ''
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* )
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* );
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*
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* SS_Cache::pick_backend('primary_memcached', 'any', 10);
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*
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* // Aggregate needs a backend with tag support, which memcached doesn't
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* // provide
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* SS_Cache::pick_backend('default', 'aggregate', 20);
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* </code>
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*
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* <h2>Using APC as a store</h2>
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*
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* <code>
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* SS_Cache::add_backend('two-level', 'Two-Levels', array(
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* 'slow_backend' => 'File',
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* 'fast_backend' => 'Apc',
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* 'slow_backend_options' => array(
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* 'cache_dir' => TEMP_FOLDER . DIRECTORY_SEPARATOR . 'cache'
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* )
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* ));
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*
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* // No need for special backend for aggregate - TwoLevels with a File slow
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* // backend supports tags
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* SS_Cache::pick_backend('two-level', 'Two-Levels', 10);
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* </code>
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*
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* <h2>Invalidate an element</h2>
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*
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* <code>
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* $cache = SS_Cache::factory('foo');
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* $cache->remove($cachekey);
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* </code>
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*
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* <h2>Clear the cache</h2>
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*
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* This clears the entire backend, not just this named cache partition.
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*
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* <code>
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* $cache = SS_Cache::factory('foo');
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* $cache->clean(Zend_Cache::CLEANING_MODE_ALL);
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* </code>
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* @see http://doc.silverstripe.org/framework/en/topics/caching
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*
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* @package framework
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* @subpackage core
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@ -21,6 +21,127 @@ executing the action is limited to the following cases when performed via a web
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* A user is logged in with ADMIN permissions
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* An error occurs during startup
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## Custom Caches
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## The Cache API
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See `[api:SS_Cache]`.
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The `[api:SS_Cache]` class provides a bunch of static functions wrapping the Zend_Cache system
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in something a little more easy to use with the SilverStripe config system.
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A `Zend_Cache` has both a frontend (determines how to get the value to cache,
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and how to serialize it for storage) and a backend (handles the actual
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storage).
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Rather than require library code to specify the backend directly, cache
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consumers provide a name for the cache backend they want. The end developer
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can then specify which backend to use for each name in their project's
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configuration. They can also use 'all' to provide a backend for all named
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caches.
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End developers provide a set of named backends, then pick the specific
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backend for each named cache. There is a default File cache set up as the
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'default' named backend, which is assigned to 'all' named caches.
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## Using Caches
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Caches can be created and retrieved through the `SS_Cache::factory()` method.
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The returned object is of type `Zend_Cache`.
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:::php
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// foo is any name (try to be specific), and is used to get configuration
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// & storage info
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$cache = SS_Cache::factory('foo');
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if (!($result = $cache->load($cachekey))) {
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$result = caluate some how;
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$cache->save($result);
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}
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return $result;
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Normally there's no need to remove things from the cache - the cache
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backends clear out entries based on age and maximum allocated storage. If you
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include the version of the object in the cache key, even object changes
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don't need any invalidation. You can force disable the cache though,
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e.g. in development mode.
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:::php
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// Disables all caches
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SS_Cache::set_cache_lifetime('any', -1, 100);
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You can also specifically clean a cache.
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Keep in mind that `Zend_Cache::CLEANING_MODE_ALL` deletes all cache
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entries across all caches, not just for the 'foo' cache in the example below.
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:::php
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$cache = SS_Cache::factory('foo');
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$cache->clean(Zend_Cache::CLEANING_MODE_ALL);
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A single element can be invalidated through its cache key.
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:::php
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$cache = SS_Cache::factory('foo');
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$cache->remove($cachekey);
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In order to increase the chance of your cache actually being hit,
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it often pays to increase the lifetime of caches ("TTL").
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It defaults to 10 minutes (600s) in SilverStripe, which can be
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quite short depending on how often your data changes.
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Keep in mind that data expiry should primarily be handled by your cache key,
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e.g. by including the `LastEdited` value when caching `DataObject` results.
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:::php
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// set all caches to 3 hours
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SS_Cache::set_cache_lifetime('any', 60*60*3);
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## Alternative Cache Backends
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By default, SilverStripe uses a file-based caching backend.
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Together with a file stat cache like [APC](http://us2.php.net/manual/en/book.apc.php)
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this is reasonably quick, but still requires access to slow disk I/O.
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The `Zend_Cache` API supports various caching backends ([list](http://framework.zend.com/manual/1.12/en/zend.cache.backends.html))
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which can provide better performance, including APC, Xcache, ZendServer, Memcached and SQLite.
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### Memcached
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This backends stores cache records into a [memcached](http://www.danga.com/memcached/)
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server. memcached is a high-performance, distributed memory object caching system.
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To use this backend, you need a memcached daemon and the memcache PECL extension.
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:::php
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// _config.php
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SS_Cache::add_backend(
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'primary_memcached',
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'Memcached',
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array(
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'host' => 'localhost',
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'port' => 11211,
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'persistent' => true,
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'weight' => 1,
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'timeout' => 5,
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'retry_interval' => 15,
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'status' => true,
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'failure_callback' => ''
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)
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);
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SS_Cache::pick_backend('primary_memcached', 'any', 10);
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### APC
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This backends stores cache records in shared memory through the [APC](http://pecl.php.net/package/APC)
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(Alternative PHP Cache) extension (which is of course need for using this backend).
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:::php
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SS_Cache::add_backend('primary_apc', 'APC');
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SS_Cache::pick_backend('primary_apc', 'any', 10);
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### Two-Levels
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This backend is an hybrid one. It stores cache records in two other backends:
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a fast one (but limited) like Apc, Memcache... and a "slow" one like File or Sqlite.
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:::php
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SS_Cache::add_backend('two_level', 'Two-Levels', array(
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'slow_backend' => 'File',
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'fast_backend' => 'APC',
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'slow_backend_options' => array(
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'cache_dir' => TEMP_FOLDER . DIRECTORY_SEPARATOR . 'cache'
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)
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));
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SS_Cache::pick_backend('two_level', 'any', 10);
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@ -43,19 +43,24 @@ class Aggregate extends ViewableData {
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protected static function cache() {
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return self::$cache ? self::$cache : (self::$cache = SS_Cache::factory('aggregate'));
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}
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/** Clear the aggregate cache for a given type, or pass nothing to clear all aggregate caches */
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/**
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* Clear the aggregate cache for a given type, or pass nothing to clear all aggregate caches.
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* {@link $class} is just effective if the cache backend supports tags.
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*/
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public static function flushCache($class=null) {
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$cache = self::cache();
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if (!$class || $class == 'DataObject') {
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$capabilities = $cache->getBackend()->getCapabilities();
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if($capabilities['tags'] && (!$class || $class == 'DataObject')) {
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$cache->clean(Zend_Cache::CLEANING_MODE_MATCHING_TAG, array('aggregate'));
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} else {
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} elseif($capabilities['tags']) {
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$tags = ClassInfo::ancestry($class);
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foreach($tags as &$tag) {
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$tag = preg_replace('/[^a-zA-Z0-9_]/', '_', $tag);
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}
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$cache->clean(Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG, $tags);
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} else {
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$cache->clean(Zend_Cache::CLEANING_MODE_ALL);
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}
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}
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