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JFinal is a simple, light, rapid,independent, extensible Java WEB + ORM framework. The feature of JFinal looks like ruby on rails especially ActiveRecord.

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/**
 * Copyright (c) 2011-2019, James Zhan 詹波 ([email protected]).
 *
 * 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 com.jfinal.plugin.activerecord;

import java.sql.Connection;
import com.jfinal.aop.Interceptor;
import com.jfinal.aop.Invocation;
import com.jfinal.kit.LogKit;

/**
 * One Connection Per Thread for one request.

 * warning: can not use this interceptor with transaction feature like Tx, Db.tx(...)
 */
public class OneConnectionPerThread implements Interceptor {
	
	public void intercept(Invocation inv) {
		Connection conn = DbKit.config.getThreadLocalConnection();
		if (conn != null) {
			inv.invoke();
			return ;
		}
		
		try {
			conn = DbKit.config.getConnection();
			DbKit.config.setThreadLocalConnection(conn);
			inv.invoke();
		}
		catch (RuntimeException e) {
			throw e;
		}
		catch (Exception e) {
			throw new RuntimeException(e);
		}
		finally {
			DbKit.config.removeThreadLocalConnection();
			if (conn != null) {
				try{conn.close();}catch(Exception e){LogKit.error(e.getMessage(), e);};
			}
		}
	}
}