SequenceBolckIdGenerator.java

/*
 * @(#)SequenceBolckIdGenerator.java 2012-8-1 下午10:00:00
 *
 * Copyright (c) 2011-2012 Makersoft.org all rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 *
 */
package org.makersoft.shards.id.db;

import java.io.Serializable;

import org.apache.ibatis.session.SqlSession;
import org.makersoft.shards.ShardId;
import org.makersoft.shards.id.IdGenerator;

/**
 * 
 */
public class SequenceBolckIdGenerator implements IdGenerator {
	protected int idBlockSize = 0;
	protected long nextId = 0;
	protected long lastId = -1;
	
	protected short nodeId = 0;
	
	public SequenceBolckIdGenerator(){
		
	}

	@Override
	public synchronized Serializable generate(SqlSession session, Object object) {
		throw new UnsupportedOperationException();
//		if (lastId < nextId) {
//			getNewBlock(session, object);
//		}
//		long _nextId = nextId++;
//		return Long.toString(_nextId);
	}

	protected synchronized void getNewBlock(SqlSession session, Object object) {

		IdBlock idBlock = session.selectOne("", idBlockSize);
		// TODO http://jira.codehaus.org/browse/ACT-45 use a separate
		// 'requiresNew' command executor
		// IdBlock idBlock = commandExecutor.execute(new
		// GetNextIdBlockCmd(idBlockSize));
		this.nextId = idBlock.getNextId();
		this.lastId = idBlock.getLastId();
	}

	@Override
	public ShardId extractShardId(Serializable identifier) {
		throw new UnsupportedOperationException();
	}

	/**
	 * 集群节点Id
	 */
	public void setNodeId(short nodeId) {
		this.nodeId = nodeId;
	}

}