import java.sql.Connection;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.jdom.Document;
import org.jdom.Element;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import com.shine.framework.util.XMLUtil;

/**
 * 数据库连接池管理器,基于C3P0

 *
 */
public class ConnPoolManager {
	
	private final static ConnPoolManager instance = new ConnPoolManager();
	
	private Map pools = new HashMap();
	
	private ConnPoolManager(){
	}
	
	public static ConnPoolManager getInstance(){
		return instance;
	}
	
	/**
	 * 初始化连接池
	 * @param configPath	配置文件路径
	 */
	public void initial(String configPath){
		Document configDoc = XMLUtil.file2Doc(configPath);
		List res = configDoc.getRootElement().getChildren("Resource");
		if(res!=null){
			for(Element re:res){
				String name = null;
				try{
					name = re.getAttributeva lue("name");
					String driverClassName = re.getAttributeva lue("driverClassName");
					String jdbcUrl = re.getAttributeva lue("jdbcUrl");
					String username = re.getAttributeva lue("username");
					String password = re.getAttributeva lue("password");
					String minPoolSize = re.getAttributeva lue("minPoolSize");
					String maxPoolSize = re.getAttributeva lue("maxPoolSize");
					String initialPoolSize = re.getAttributeva lue("initialPoolSize");
					String acquireIncrement = re.getAttributeva lue("acquireIncrement");
					String idleConnectionTestPeriod = re.getAttributeva lue("idleConnectionTestPeriod");
					String checkoutTimeout = re.getAttributeva lue("checkoutTimeout");
					String maxStatement = re.getAttributeva lue("maxStatement");
					String maxStatementsPerConnection = re.getAttributeva lue("maxStatementsPerConnection");
					String maxIdleTime = re.getAttributeva lue("maxIdleTime");
					String numHelperThreads = re.getAttributeva lue("numHelperThreads");
					
					ComboPooledDataSource pool = new ComboPooledDataSource();
					pool.setDataSourceName(name);									//数据源名称
					pool.setDriverClass(driverClassName);							//数据库驱动类名
					pool.setJdbcUrl(jdbcUrl);										//数据库连接url
					pool.setUser(username);											//数据库用户名
					pool.setPassword(password);										//数据库密码
					pool.setMinPoolSize(string2int(minPoolSize, 2));				//最小连接数
					pool.setInitialPoolSize(string2int(initialPoolSize, 5));		//初始化连接数
					pool.setMaxPoolSize(string2int(maxPoolSize, 20));				//最大连接数
					pool.setAcquireIncrement(string2int(acquireIncrement, 3));		//连接数的增量
					pool.setIdleConnectionTestPeriod(string2int(idleConnectionTestPeriod, 120));	//检测空闲连接的时间间隔,单位为秒
					pool.setCheckoutTimeout(string2int(checkoutTimeout, 3000));		//获取连接的超时时间,超时则抛出异常,单位为毫秒
					pool.setMaxStatements(string2int(maxStatement, 0));				//最大statement数
					pool.setMaxStatementsPerConnection(string2int(maxStatementsPerConnection, 0));	//单个连接所拥有的最大statement缓存数
					pool.setMaxIdleTime(string2int(maxIdleTime, 300));				//最大空闲时间,该时间内未使用的连接将被丢弃,单位为秒
					pool.setNumHelperThreads(string2int(numHelperThreads, 3));		//帮助线程个数,通过多线程同时执行SQL
					
					pools.put(name, pool);
					System.out.println("注册数据库连接池"+name);
				}c