001/**
002 * Copyright (c) 2022-2023, Mybatis-Flex (fuhai999@gmail.com).
003 * <p>
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 * <p>
008 * http://www.apache.org/licenses/LICENSE-2.0
009 * <p>
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package com.mybatisflex.core.mybatis;
017
018import com.mybatisflex.annotation.UseDataSource;
019import com.mybatisflex.core.FlexGlobalConfig;
020import com.mybatisflex.core.datasource.DataSourceKey;
021import com.mybatisflex.core.datasource.FlexDataSource;
022import com.mybatisflex.core.dialect.DbType;
023import com.mybatisflex.core.dialect.DialectFactory;
024import com.mybatisflex.core.row.RowMapper;
025import com.mybatisflex.core.table.TableInfo;
026import com.mybatisflex.core.table.TableInfoFactory;
027import com.mybatisflex.core.util.StringUtil;
028import org.apache.ibatis.session.Configuration;
029
030import java.lang.reflect.InvocationHandler;
031import java.lang.reflect.Method;
032
033public class MapperInvocationHandler implements InvocationHandler {
034
035    private final Object mapper;
036    private final FlexDataSource dataSource;
037
038    public MapperInvocationHandler(Object mapper, Configuration configuration) {
039        this.mapper = mapper;
040        this.dataSource = (FlexDataSource) configuration.getEnvironment().getDataSource();
041    }
042
043
044    @Override
045    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
046        boolean clearDsKey = false;
047        boolean clearDbType = false;
048        try {
049            //获取用户动态指定，由用户指定数据源，则应该有用户清除
050            String dataSourceKey = DataSourceKey.get();
051
052            if (StringUtil.isBlank(dataSourceKey)) {
053                //通过 @UseDataSource 或者 @Table(dataSource) 去获取
054                String configDataSourceKey = getConfigDataSourceKey(method, proxy);
055                if (StringUtil.isNotBlank(configDataSourceKey)) {
056                    dataSourceKey = configDataSourceKey;
057                    DataSourceKey.use(dataSourceKey);
058                    clearDsKey = true;
059                }
060            }
061
062            //优先获取用户自己配置的 dbType
063            DbType dbType = DialectFactory.getHintDbType();
064            if (dbType == null) {
065                if (dataSourceKey != null) {
066                    dbType = dataSource.getDbType(dataSourceKey);
067                }
068                if (dbType == null) {
069                    dbType = FlexGlobalConfig.getDefaultConfig().getDbType();
070                }
071                DialectFactory.setHintDbType(dbType);
072                clearDbType = true;
073            }
074            return method.invoke(mapper, args);
075        } finally {
076            if (clearDbType) {
077                DialectFactory.clearHintDbType();
078            }
079            if (clearDsKey) {
080                DataSourceKey.clear();
081            }
082        }
083    }
084
085
086    private static String getConfigDataSourceKey(Method method, Object proxy) {
087        UseDataSource useDataSource = method.getAnnotation(UseDataSource.class);
088        if (useDataSource != null && StringUtil.isNotBlank(useDataSource.value())) {
089            return useDataSource.value();
090        }
091
092        Class<?>[] interfaces = proxy.getClass().getInterfaces();
093        if (interfaces[0] != RowMapper.class) {
094            TableInfo tableInfo = TableInfoFactory.ofMapperClass(interfaces[0]);
095            if (tableInfo != null) {
096                String dataSourceKey = tableInfo.getDataSource();
097                if (StringUtil.isNotBlank(dataSourceKey)) {
098                    return dataSourceKey;
099                }
100            }
101        }
102        return null;
103    }
104
105
106}