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5853097561
Provie a mechanism to specify cache type from NONE, APC, or MEMCACHE based on a config variable. If MEMCACHE type is selected, a list of servers can be specified to provide multiserver support. Note that php-memcaced is required for MEMCACHE support. Lukas: Minor commenting style fixes. Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>
82 lines
2.5 KiB
PHP
82 lines
2.5 KiB
PHP
<?php
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if (!defined('CACHE_TYPE')) {
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define('CACHE_TYPE', 'NONE');
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}
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# Check if APC extension is loaded, and set cache prefix if it is.
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if (CACHE_TYPE == 'APC' && !defined('EXTENSION_LOADED_APC')) {
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define('EXTENSION_LOADED_APC', extension_loaded('apc'));
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define('CACHE_PREFIX', 'aur:');
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}
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# Check if memcache extension is loaded, and set cache prefix if it is.
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if (CACHE_TYPE == 'MEMCACHE' && !defined('EXTENSION_LOADED_MEMCACHE')) {
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define('EXTENSION_LOADED_MEMCACHE', extension_loaded('memcached'));
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define('CACHE_PREFIX', 'aur:');
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global $memcache;
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$memcache = new Memcached();
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$mcs = defined('MEMCACHE_SERVERS') ? MEMCACHE_SERVERS : '127.0.0.1:11211';
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foreach (explode(',', $mcs) as $elem) {
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$telem = trim($elem);
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$mcserver = explode(':', $telem);
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$memcache->addServer($mcserver[0], intval($mcserver[1]));
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}
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}
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# Set a value in the cache (currently APC) if cache is available for use. If
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# not available, this becomes effectively a no-op (return value is
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# false). Accepts an optional TTL (defaults to 600 seconds).
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function set_cache_value($key, $value, $ttl=600) {
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$status = false;
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if (defined('EXTENSION_LOADED_APC')) {
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$status = apc_store(CACHE_PREFIX.$key, $value, $ttl);
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}
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if (defined('EXTENSION_LOADED_MEMCACHE')) {
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global $memcache;
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$status = $memcache->set(CACHE_PREFIX.$key, $value, $ttl);
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}
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return $status;
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}
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# Get a value from the cache (currently APC) if cache is available for use. If
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# not available, this returns false (optionally sets passed in variable $status
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# to false, much like apc_fetch() behaves). This allows for testing the fetch
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# result appropriately even in the event that a 'false' value was the value in
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# the cache.
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function get_cache_value($key, &$status=false) {
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if(defined('EXTENSION_LOADED_APC')) {
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$ret = apc_fetch(CACHE_PREFIX.$key, $status);
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if ($status) {
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return $ret;
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}
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}
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if (defined('EXTENSION_LOADED_MEMCACHE')) {
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global $memcache;
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$ret = $memcache->get(CACHE_PREFIX.$key);
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if (!$ret) {
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$status = false;
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}
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else {
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$status = true;
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}
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return $ret;
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}
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return $status;
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}
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# Run a simple db query, retrieving and/or caching the value if APC is
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# available for use. Accepts an optional TTL value (defaults to 600 seconds).
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function db_cache_value($dbq, $dbh, $key, $ttl=600) {
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$status = false;
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$value = get_cache_value($key, $status);
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if (!$status) {
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$result = db_query($dbq, $dbh);
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$row = mysql_fetch_row($result);
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$value = $row[0];
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set_cache_value($key, $value, $ttl);
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}
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return $value;
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}
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?>
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