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package com.xiaoleilu.hutool.db.ds.jndi;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import javax.sql.DataSource;

import com.xiaoleilu.hutool.db.DbRuntimeException;
import com.xiaoleilu.hutool.db.DbUtil;
import com.xiaoleilu.hutool.db.ds.DSFactory;
import com.xiaoleilu.hutool.setting.Setting;
import com.xiaoleilu.hutool.util.StrUtil;

/**
 * JNDI数据源工厂类

 * Setting配置样例：

 * ---------------------

 * [group]

 * jndi = jdbc/TestDB

 * ---------------------

 * 
 * @author Looly
 *
 */
public class JndiDSFactory extends DSFactory {
	
	public static final String DS_NAME = "JNDI DataSource";
	
	private Setting setting;
	/** 数据源池 */
	private Map dsMap;
	
	public JndiDSFactory() {
		this(null);
	}
	
	public JndiDSFactory(Setting setting) {
		super(DS_NAME, null, setting);
		this.dsMap = new ConcurrentHashMap<>();
	}

	@Override
	synchronized public DataSource getDataSource(String group) {
		if (group == null) {
			group = StrUtil.EMPTY;
		}
		
		// 如果已经存在已有数据源（连接池）直接返回
		final DataSource existedDataSource = dsMap.get(group);
		if (existedDataSource != null) {
			return existedDataSource;
		}

		final DataSource ds = createDataSource(group);
		// 添加到数据源池中，以备下次使用
		dsMap.put(group, ds);
		return ds;
	}

	@Override
	public void close(String group) {
		//JNDI Datasource not support close method
	}

	@Override
	public void destroy() {
		//JNDI Datasource not support destroy method
	}

	/**
	 * 创建数据源
	 * @param group JNDI名
	 * @return 数据源 {@link DataSource}
	 */
	private DataSource createDataSource(String group){
		if (group == null) {
			group = StrUtil.EMPTY;
		}
		
		String jndiName = setting.getByGroup("jndi", group);
		if(StrUtil.isEmpty(jndiName)){
			throw new DbRuntimeException("No setting name [jndi] for group [{}]", group);
		}
		DataSource ds = DbUtil.getJndiDs(jndiName);
		
		return ds;
	}
}