diff options
Diffstat (limited to 'framework/DataAccess/SQLMap/DataMapper/TSqlMapCache.php')
| -rw-r--r-- | framework/DataAccess/SQLMap/DataMapper/TSqlMapCache.php | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/framework/DataAccess/SQLMap/DataMapper/TSqlMapCache.php b/framework/DataAccess/SQLMap/DataMapper/TSqlMapCache.php new file mode 100644 index 00000000..8571d46d --- /dev/null +++ b/framework/DataAccess/SQLMap/DataMapper/TSqlMapCache.php @@ -0,0 +1,165 @@ +<?php
+/**
+ * TSqlMapCache class file contains FIFO and LRU cache implementations.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright © 2005 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Revision: $ $Date: $
+ * @package System.DataAccess.SQLMap
+ */
+
+interface ISqLMapCache
+{
+ public function remove($key);
+
+ public function flush();
+
+ public function get($key);
+
+ public function set($key, $value);
+
+ public function configure($properties);
+}
+
+/**
+ * Allow different implementation of caching strategy. See <tt>TSqlMapFifoCache</tt>
+ * for a first-in-first-out implementation. See <tt>TSqlMapLruCache</tt> for
+ * a least-recently-used cache implementation.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Revision: $ $Date: $
+ * @package System.DataAccess.SQLMap
+ * @since 3.0
+ */
+abstract class TSqlMapCache implements ISqlMapCache
+{
+ protected $_keyList;
+ protected $_cache;
+ protected $_cacheSize = 100;
+
+ /**
+ * Create a new cache with limited cache size.
+ * @param integer maxium number of items to cache.
+ */
+ public function __construct($cacheSize=100)
+ {
+ $this->_cache = new TMap;
+ $this->_cacheSize = intval($cacheSize);
+ $this->_keyList = new TList;
+ }
+
+ /**
+ * Configures the Cache Size.
+ * @param array list of properties
+ */
+ public function configure($properties)
+ {
+ if(isset($properties['size']))
+ $this->_cacheSize = intval($properties['size']);
+ }
+
+ /**
+ * @return object the object removed if exists, null otherwise.
+ */
+ public function remove($key)
+ {
+ $object = $this->get($key);
+ $this->_cache->remove($key);
+ $this->_keyList->remove($key);
+ return $object;
+ }
+
+ /**
+ * Clears the cache.
+ */
+ public function flush()
+ {
+ $this->_keyList->clear();
+ $this->_cache->clear();
+ }
+
+}
+
+/**
+ * First-in-First-out cache implementation, removes
+ * object that was first added when the cache is full.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Revision: $ $Date: $
+ * @package System.DataAccess.SQLMap
+ * @since 3.0
+ */
+class TSqlMapFifoCache extends TSqlMapCache
+{
+ /**
+ * @return mixed Gets a cached object with the specified key.
+ */
+ public function get($key)
+ {
+ return $this->_cache->itemAt($key);
+ }
+
+ /**
+ * Adds an item with the specified key and value into cached data.
+ * @param string cache key
+ * @param mixed value to cache.
+ */
+ public function set($key, $value)
+ {
+ $this->_cache->add($key, $value);
+ $this->_keyList->add($key);
+ if($this->_keyList->getCount() > $this->_cacheSize)
+ {
+ $oldestKey = $this->_keyList->removeAt(0);
+ $this->_cache->remove($oldestKey);
+ }
+ }
+}
+
+/**
+ * Least recently used cache implementation, removes
+ * object that was accessed last when the cache is full.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Revision: $ $Date: $
+ * @package System.DataAccess.SQLMap
+ * @since 3.0
+ */
+class TSqlMapLruCache extends TSqlMapCache
+{
+ /**
+ * @return mixed Gets a cached object with the specified key.
+ */
+ public function get($key)
+ {
+ if($this->_keyList->contains($key))
+ {
+ $this->_keyList->remove($key);
+ $this->_keyList->add($key);
+ return $this->_cache->itemAt($key);
+ }
+ else
+ return null;
+ }
+
+ /**
+ * Adds an item with the specified key and value into cached data.
+ * @param string cache key
+ * @param mixed value to cache.
+ */
+ public function set($key, $value)
+ {
+ $this->_cache->add($key, $value);
+ $this->_keyList->add($key);
+ if($this->_keyList->getCount() > $this->_cacheSize)
+ {
+ $oldestKey = $this->_keyList->removeAt(0);
+ $this->_cache->remove($oldestKey);
+ }
+ }
+}
+
+
+?>
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