Refactor codes.

import io.shardingjdbc.core.routing.type.RoutingResult;

import io.shardingjdbc.core.routing.type.TableUnit;

import lombok.RequiredArgsConstructor;

import lombok.extern.slf4j.Slf4j;

import javax.sql.DataSource;

import java.util.Map;

 * @author zhangliang

 */

@RequiredArgsConstructor

@Slf4j

public final class DatabaseAllRoutingEngine implements RoutingEngine {

    private final Map<String, DataSource> dataSourceMap;