/*******************************************************************************
* Copyright 2010 Cees De Groot, Alex Boisvert, Jan Kotek
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package de.mxro.thrd.jdbm2V22;
import java.io.IOException;
import java.util.Properties;
import de.mxro.thrd.jdbm2V22.recman.BaseRecordManager;
import de.mxro.thrd.jdbm2V22.recman.CacheRecordManager;
/**
* This is the factory class to use for instantiating {@link RecordManager}
* instances.
*
* @author <a href="mailto:boisvert@intalio.com">Alex Boisvert</a>
* @author <a href="cg@cdegroot.com">Cees de Groot</a>
* @version $Id: RecordManagerFactory.java,v 1.2 2005/06/25 23:12:31 doomdark
* Exp $
*/
public final class RecordManagerFactory {
/**
* Create a record manager.
*
* @param name
* Name of the record file.
* @throws IOException
* if an I/O related exception occurs while creating or opening
* the record manager.
* @throws UnsupportedOperationException
* if some options are not supported by the implementation.
* @throws IllegalArgumentException
* if some options are invalid.
*/
public static RecordManager createRecordManager(String name)
throws IOException {
return createRecordManager(name, new Properties());
}
/**
* Create a record manager.
*
* @param name
* Name of the record file.
* @param options
* Record manager options.
* @throws IOException
* if an I/O related exception occurs while creating or opening
* the record manager.
* @throws UnsupportedOperationException
* if some options are not supported by the implementation.
* @throws IllegalArgumentException
* if some options are invalid.
*/
@SuppressWarnings("unchecked")
public static RecordManager createRecordManager(String name,
Properties options) throws IOException {
RecordManager recman = new BaseRecordManager( name );
String value = options.getProperty( RecordManagerOptions.DISABLE_TRANSACTIONS, "false" );
if ( value.equalsIgnoreCase( "TRUE" ) ) {
( (BaseRecordManager) recman ).disableTransactions();
}
value = options.getProperty(RecordManagerOptions.COMPRESS,"false");
boolean compress = value.equalsIgnoreCase("TRUE");
if(compress)
( (BaseRecordManager) recman ).setCompress(true);
value = options.getProperty(RecordManagerOptions.APPEND_TO_END,"false");
boolean append = value.equalsIgnoreCase("TRUE");
if(append)
( (BaseRecordManager) recman ).setAppendToEnd(true);
String cacheType = options.getProperty( RecordManagerOptions.CACHE_TYPE, "auto" );
value = options.getProperty( RecordManagerOptions.CACHE_SIZE, "1000" );
int cacheSize = Integer.parseInt( value );
if("auto".equals(cacheType)){
try{
//disable SOFT if available memory is bellow 50 MB
if(Runtime.getRuntime().maxMemory()<=50000000)
cacheType = "mru";
else
cacheType = "soft";
}catch(Exception e){
cacheType = "mru";
}
}
if ("mru".equals(cacheType)) {
if(cacheSize>0){
recman = new CacheRecordManager( recman,cacheSize,false);
}
}else if ("soft".equals(cacheType)) {
// cachesize is the size of the internal MRU, not the soft cache
recman = new CacheRecordManager(recman, cacheSize,true);
}else if ("none".equals(cacheType)) {
//do nothing
}else{
throw new IllegalArgumentException("Unknown cache type: "+cacheType);
}
return recman;
}
}