/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esper.epl.db;
import com.espertech.esper.client.ConfigurationDataCache;
import com.espertech.esper.client.ConfigurationLRUCache;
import com.espertech.esper.client.ConfigurationExpiryTimeCache;
import com.espertech.esper.core.EPStatementHandle;
import com.espertech.esper.schedule.ScheduleBucket;
import com.espertech.esper.schedule.SchedulingService;
/**
* Factory for data caches for use caching database query results and method invocation results.
*/
public class DataCacheFactory
{
/**
* Creates a cache implementation for the strategy as defined by the cache descriptor.
* @param cacheDesc cache descriptor
* @param epStatementHandle statement handle for timer invocations
* @param schedulingService scheduling service for time-based caches
* @param scheduleBucket for ordered timer invokation
* @return data cache implementation
*/
public static DataCache getDataCache(ConfigurationDataCache cacheDesc,
EPStatementHandle epStatementHandle,
SchedulingService schedulingService,
ScheduleBucket scheduleBucket)
{
if (cacheDesc == null)
{
return new DataCacheNullImpl();
}
if (cacheDesc instanceof ConfigurationLRUCache)
{
ConfigurationLRUCache lruCache = (ConfigurationLRUCache) cacheDesc;
return new DataCacheLRUImpl(lruCache.getSize());
}
if (cacheDesc instanceof ConfigurationExpiryTimeCache)
{
ConfigurationExpiryTimeCache expCache = (ConfigurationExpiryTimeCache) cacheDesc;
return new DataCacheExpiringImpl(expCache.getMaxAgeSeconds(), expCache.getPurgeIntervalSeconds(), expCache.getCacheReferenceType(),
schedulingService, scheduleBucket.allocateSlot(), epStatementHandle);
}
throw new IllegalStateException("Cache implementation class not configured");
}
}