refactor TransactionEngine to interface

 *

 * @author zhaojun

 */

public final class DefaultTransactionEngine extends TransactionEngine {

public final class DefaultTransactionEngine implements TransactionEngine {

    @Override

    public boolean execute() {

package io.shardingsphere.proxy.backend.jdbc.transaction;

import lombok.RequiredArgsConstructor;

import java.sql.SQLException;

/**

 * Abstract transaction engine.

 * Transaction engine.

 *

 * @author zhaojun

 */

@RequiredArgsConstructor

public abstract class TransactionEngine {

public interface TransactionEngine {

    /**

     * Execute transaction with binding transaction manager.

     * @return skip or not skip access backend databases 

     * @throws SQLException SQL exception

     */

    public abstract boolean execute() throws SQLException;

    boolean execute() throws SQLException;

}

 * @author zhaojun

 */

@RequiredArgsConstructor

public final class XATransactionEngine extends TransactionEngine {

public final class XATransactionEngine implements TransactionEngine {

    private final String sql;