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/*
 * Copyright 2016 the original author or authors.
 *
 * 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.github.drinkjava2.jtransactions;

import java.sql.Connection;
import java.sql.SQLException;

import javax.sql.DataSource;

/**
 * A ConnectionManager implementation determine how to get or release connection
 * from DataSource or ThreadLocal or from Spring or JTA or some container...
 * 
 * @author Yong Zhu
 * @since 1.0.0
 */
public interface ConnectionManager {
	/**
	 * A ConnectionManager implementation determine how to get connection from
	 * DataSource or ThreadLocal or from Spring or JTA or some container...

	 * 

	 * For ManualTx, usually get a connection directly from dataSource
	 */
	public Connection getConnection(DataSource dataSource) throws SQLException;

	/**
	 * A ConnectionManager implementation determine how to close connection or
	 * return connection to ThreadLocal or return to Spring or JTA or some
	 * container...

	 * 

	 * For ManualTx, usually directly close a connection
	 */
	public void releaseConnection(Connection conn, DataSource dataSource) throws SQLException;

	/**
	 * Check if a connection already be get from given dataSource and be cached as
	 * it started a Transaction 

	 * 

	 * For ManualTx, return true if getConnection be called and connection not be
	 * closed.
	 */
	public boolean isInTransaction(DataSource dataSource);
 
}