/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. you can redistribute it and/or modify it under the
* terms of the GNU General Public License version 2 only, as published by the
* Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package org.opencloudb.sequence.handler;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* 递增序列号处理器
*
* @author <a href="http://www.micmiu.com">Michael</a>
* @time Create on 2013-12-29 下午10:42:39
* @version 1.0
*/
public abstract class IncrSequenceHandler implements SequenceHandler {
public static final Logger logger = LoggerFactory
.getLogger(IncrSequenceHandler.class);
public static final String FILE_NAME = "sequence_conf.properties";
public static final String KEY_HIS_NAME = ".HISIDS";// 1-10000,50001-60000
public static final String KEY_MIN_NAME = ".MINID";// 1
public static final String KEY_MAX_NAME = ".MAXID";// 10000
public static final String KEY_CUR_NAME = ".CURID";// 888
public abstract Map<String, String> getParaValMap(String prefixName);
public abstract Boolean updateCURIDVal(String prefixName, Long val);
public abstract Boolean fetchNextPeriod(String prefixName);
@Override
public long nextId(String prefixName) {
Map<String, String> paraMap = this.getParaValMap(prefixName);
if (null == paraMap) {
throw new RuntimeException("fetch Param Values error.");
}
Long nextId = Long.parseLong(paraMap.get(prefixName + KEY_CUR_NAME)) + 1;
Long maxId = Long.parseLong(paraMap.get(prefixName + KEY_MAX_NAME));
if (nextId > maxId) {
fetchNextPeriod(prefixName);
return nextId(prefixName);
}
updateCURIDVal(prefixName, nextId);
return nextId.longValue();
}
}