<?php /** * TSqlMapCacheModel, TSqlMapCacheTypes and TSqlMapCacheKey classes file. * * @author Wei Zhuo <weizhuo[at]gmail[dot]com> * @link http://www.pradosoft.com/ * @copyright Copyright © 2005-2008 PradoSoft * @license http://www.pradosoft.com/license/ * @version $Id$ * @package System.Data.SqlMap.Configuration */ /** * TSqlMapCacheModel corresponds to the <cacheModel> sql mapping configuration tag. * * The results from a query Mapped Statement can be cached simply by specifying * the {@link CacheModel TSqlMapStatement::setCacheModel()} property in <statement> tag. * A cache model is a configured cache that is defined within the sql map * configuration file. Cache models are configured using the <cacheModel> element. * * The cache model uses a pluggable framework for supporting different types of * caches. The choice of cache is specified by the {@link Implementation setImplementation()} * property. The class name specified must be one of {@link TSqlMapCacheTypes}. * * The cache implementations, LRU and FIFO cache below do not persist across * requests. That is, once the request is complete, all cache data is lost. * These caches are useful queries that results in the same repeated data during * the current request. * * @author Wei Zhuo <weizho[at]gmail[dot]com> * @version $Id$ * @package System.Data.SqlMap.Configuration * @since 3.1 */ class TSqlMapCacheModel extends TComponent { private $_cache; private $_hits = 0; private $_requests = 0; private $_id; private $_implementation=TSqlMapCacheTypes::Basic; private $_properties = array(); private $_flushInterval = 0; /** * @return string unique cache model identifier. */ public function getID() { return $this->_id; } /** * @param string unique cache model identifier. */ public function setID($value) { $this->_id = $value; } /** * @return string cache implements of TSqlMapCacheTypes, either 'Basic', 'LRU' or 'FIFO'. */ public function getImplementation() { return $this->_implementation; } /** * @param string cache implements of TSqlMapCacheTypes, either 'Basic', 'LRU' or 'FIFO'. */ public function setImplementation($value) { $this->_implementation = TPropertyValue::ensureEnum($value,'TSqlMapCacheTypes'); } /** * @param integer the number of seconds in which the cached value will expire. 0 means never expire. */ public function setFlushInterval($value) { $this->_flushInterval=TPropertyValue::ensureInteger($value); } /** * @return integer cache duration. */ public function getFlushInterval() { return $this->_flushInterval; } /** * Initialize the cache implementation, sets the actual cache contain if supplied. * @param ISqLMapCache cache implementation instance. */ public function initialize($cache=null) { if($cache===null) $this->_cache= Prado::createComponent($this->getImplementationClass()); else $this->_cache=$cache; } /** * @return string cache implementation class name. */ public function getImplementationClass() { switch(TPropertyValue::ensureEnum($this->_implementation,'TSqlMapCacheTypes')) { case TSqlMapCacheTypes::FIFO: return 'TSqlMapFifoCache'; case TSqlMapCacheTypes::LRU : return 'TSqlMapLruCache'; case TSqlMapCacheTypes::Basic : return 'TSqlMapApplicationCache'; } } /** * Register a mapped statement that will trigger a cache flush. * @param TMappedStatement mapped statement that may flush the cache. */ public function registerTriggerStatement($mappedStatement) { $mappedStatement->attachEventHandler('OnExecuteQuery',array($this, 'flush')); } /** * Clears the cache. */ public function flush() { $this->_cache->flush(); } /** * @param TSqlMapCacheKey|string cache key * @return mixed cached value. */ public function get($key) { if($key instanceof TSqlMapCacheKey) $key = $key->getHash(); //if flush ? $value = $this->_cache->get($key); $this->_requests++; if($value!==null) $this->_hits++; return $value; } /** * @param TSqlMapCacheKey|string cache key * @param mixed value to be cached. */ public function set($key, $value) { if($key instanceof TSqlMapCacheKey) $key = $key->getHash(); if($value!==null) $this->_cache->set($key, $value, $this->_flushInterval); } /** * @return float cache hit ratio. */ public function getHitRatio() { if($this->_requests != 0) return $this->_hits / $this->_requests; else return 0; } } /** * TSqlMapCacheTypes enumerable class. * * Implemented cache are 'Basic', 'FIFO' and 'LRU'. * * @author Wei Zhuo <weizho[at]gmail[dot]com> * @version $Id$ * @package System.Data.SqlMap.Configuration * @since 3.1 */ class TSqlMapCacheTypes extends TEnumerable { const Basic='Basic'; const FIFO='FIFO'; const LRU='LRU'; } /** * TSqlMapCacheKey class. * * Provides a hash of the object to be cached. * * @author Wei Zhuo <weizho[at]gmail[dot]com> * @version $Id$ * @package System.Data.SqlMap.Configuration * @since 3.1 */ class TSqlMapCacheKey { private $_key; /** * @param mixed object to be cached. */ public function __construct($object) { $this->_key = $this->generateKey(serialize($object)); } /** * @param string serialized object * @return string crc32 hash of the serialized object. */ protected function generateKey($string) { return sprintf('%x',crc32($string)); } /** * @return string object hash. */ public function getHash() { return $this->_key; } }