<T> byte[] encode(T t);

<T> T decode(byte[] bytes);

    public void exceptionHandleTemplate(Callback callback, AbstractTransactionRequest request,
        AbstractTransactionResponse response) {
        try {
            callback.execute(request, response); //执行事务业务的方法
            callback.onSuccess(request, response); //设置response返回码
        } catch (TransactionException tex) {
            LOGGER.error("Catch TransactionException while do RPC, request: {}", request, tex);
            callback.onTransactionException(request, response, tex); //设置response返回码并设置msg
        } catch (RuntimeException rex) {
            LOGGER.error("Catch RuntimeException while do RPC, request: {}", request, rex);
            callback.onException(request, response, rex);  //设置response返回码并设置msg
        }
    }

public void onMessage(RpcMessage request, String serverAddress, ClientMessageSender sender) {
        Object msg = request.getBody();
        if (LOGGER.isInfoEnabled()) {
            LOGGER.info("onMessage:" + msg);
        }
        if (msg instanceof BranchCommitRequest) {
            handleBranchCommit(request, serverAddress, (BranchCommitRequest)msg, sender);
        } else if (msg instanceof BranchRollbackRequest) {
            handleBranchRollback(request, serverAddress, (BranchRollbackRequest)msg, sender);
        } else if (msg instanceof UndoLogDeleteRequest) {
            handleUndoLogDelete((UndoLogDeleteRequest)msg);
        }
    }

package org.test.config;

import java.lang.reflect.Method;

import org.apache.commons.lang3.StringUtils;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import io.seata.core.context.RootContext;
import io.seata.core.exception.TransactionException;
import io.seata.tm.api.GlobalTransaction;
import io.seata.tm.api.GlobalTransactionContext;

@Aspect
@Component
public class TestAspect {
    private final static Logger logger = LoggerFactory.getLogger(TestAspect.class);

    @Before("execution(* org.test.service.*.*(..))")
    public void before(JoinPoint joinPoint) throws TransactionException {
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();
        Method method = signature.getMethod();
        logger.info("拦截到需要分布式事务的方法," + method.getName());
        // 此处可用redis或者定时任务来获取一个key判断是否需要关闭分布式事务
        // 模拟动态关闭分布式事务
        if ((int)(Math.random() * 100) % 2 == 0) {
            GlobalTransaction tx = GlobalTransactionContext.getCurrentOrCreate();
            tx.begin(300000, "test-client");
        } else {
            logger.info("关闭分布式事务");
        }
    }

    @AfterThrowing(throwing = "e", pointcut = "execution(* org.test.service.*.*(..))")
    public void doRecoveryActions(Throwable e) throws TransactionException {
        logger.info("方法执行异常:{}", e.getMessage());
        if (!StringUtils.isBlank(RootContext.getXID()))
            GlobalTransactionContext.reload(RootContext.getXID()).rollback();
    }

    @AfterReturning(value = "execution(* org.test.service.*.*(..))", returning = "result")
    public void afterReturning(JoinPoint point, Object result) throws TransactionException {
        logger.info("方法执行结束:{}", result);
        if ((Boolean)result) {
            if (!StringUtils.isBlank(RootContext.getXID())) {
                logger.info("分布式事务Id:{}", RootContext.getXID());
                GlobalTransactionContext.reload(RootContext.getXID()).commit();
            }
        }
    }

}

    public Object seataCommit() {
        testService.Commit();
        return true;
    }

    public Object seataCommit() {
        try {
            testService.Commit();
            int i = 1 / 0;
            return true;
        } catch (Exception e) {
            // TODO: handle exception
            throw new RuntimeException();
        }
    }

2019-12-23 11:57:55.386  INFO 23952 --- [.0-28888-exec-7] org.test.controller.TestController       : 拦截到需要分布式事务的方法,seataCommit
2019-12-23 11:57:55.489  INFO 23952 --- [.0-28888-exec-7] i.seata.tm.api.DefaultGlobalTransaction  : Begin new global transaction [192.168.14.67:8092:2030765910]
2019-12-23 11:57:55.489  INFO 23952 --- [.0-28888-exec-7] org.test.controller.TestController       : 创建分布式事务完毕192.168.14.67:8092:2030765910
2019-12-23 11:57:55.709  INFO 23952 --- [.0-28888-exec-7] org.test.controller.TestController       : 方法执行异常:null
2019-12-23 11:57:55.885  INFO 23952 --- [.0-28888-exec-7] i.seata.tm.api.DefaultGlobalTransaction  : [192.168.14.67:8092:2030765910] rollback status: Rollbacked
2019-12-23 11:57:55.888 ERROR 23952 --- [.0-28888-exec-7] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.RuntimeException] with root cause

    public Object seataCommit() {
        testService.Commit();
        return true;
    }

ConcurrentMap<String/*dataId*/, Set<ConfigurationChangeListener>> configListenersMap

private volatile boolean disable; 

short getShort(String dataId, int defaultValue, long timeoutMills);
int getInt(String dataId, int defaultValue, long timeoutMills);
long getLong(String dataId, long defaultValue, long timeoutMills);
// ....

Configuration CONFIG = ConfigurationFactory.getInstance();

EnhancedServiceLoader.load(ConfigurationProvider.class,Objects.requireNonNull(configType).name()).provide();

@LoadLevel(name = "ZK", order = 1)

Objects.requireNonNull(configType).name()

public enum ConfigType {
  File, ZK, Nacos, Apollo, Consul, Etcd3, SpringCloudConfig, Custom;
}

private static final Configuration FILE_CONFIG = ConfigurationFactory.CURRENT_FILE_INSTANCE;

	<properties>
		<webVersion>3.1</webVersion>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
		<HikariCP.version>3.2.0</HikariCP.version>
		<mybatis-plus-boot-starter.version>3.2.0</mybatis-plus-boot-starter.version>
	</properties>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.8.RELEASE</version>
	</parent>
	<dependencies>
		<dependency>
			<groupId>com.alibaba.nacos</groupId>
			<artifactId>nacos-client</artifactId>
			<version>1.1.4</version>
		</dependency>
		<dependency>
			<groupId>org.apache.dubbo</groupId>
			<artifactId>dubbo-registry-nacos</artifactId>
			<version>2.7.4.1</version>
		</dependency>
		<dependency>
			<groupId>org.apache.dubbo</groupId>
			<artifactId>dubbo-spring-boot-starter</artifactId>
			<version>2.7.4.1</version>
		</dependency>
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.60</version>
		</dependency>
		<!-- <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId>
			<version>7.0</version> <scope>provided</scope> </dependency> -->
		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger2</artifactId>
			<version>2.9.2</version>
		</dependency>
		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger-ui</artifactId>
			<version>2.9.2</version>
		</dependency>

		<!-- mybatis-plus begin -->
		<dependency>
			<groupId>com.baomidou</groupId>
			<artifactId>mybatis-plus-boot-starter</artifactId>
			<version>${mybatis-plus-boot-starter.version}</version>
		</dependency>
		<!-- mybatis-plus end -->
		<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>io.seata</groupId>
			<artifactId>seata-all</artifactId>
			<version>0.9.0.1</version>
		</dependency>
		<!-- <dependency> <groupId>com.baomidou</groupId> <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
			<version>2.5.4</version> </dependency> -->

		<!-- <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-generator</artifactId>
			<version>3.1.0</version> </dependency> -->
		<!-- https://mvnrepository.com/artifact/org.freemarker/freemarker -->
		<dependency>
			<groupId>org.freemarker</groupId>
			<artifactId>freemarker</artifactId>
		</dependency>
		<!-- https://mvnrepository.com/artifact/com.alibaba/druid-spring-boot-starter -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.20</version>
		</dependency>
		<!-- 加上这个才能辨认到log4j2.yml文件 -->
		<dependency>
			<groupId>com.fasterxml.jackson.dataformat</groupId>
			<artifactId>jackson-dataformat-yaml</artifactId>
		</dependency>
		<dependency> <!-- 引入log4j2依赖 -->
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-log4j2</artifactId>
		</dependency>
		<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
			<exclusions>
				<exclusion>
					<groupId>org.springframework.boot</groupId>
					<artifactId>spring-boot-starter-logging</artifactId>
				</exclusion>
				<exclusion>
					<groupId>org.slf4j</groupId>
					<artifactId>slf4j-log4j12</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-aop</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<!-- <dependency> <groupId>org.scala-lang</groupId> <artifactId>scala-library</artifactId>
			<version>2.11.0</version> </dependency> -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-configuration-processor</artifactId>
			<optional>true</optional>
		</dependency>
	</dependencies>

registry {
  type = "nacos"
  file {
    name = "file.conf"
  }
   zk {
    cluster = "default"
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
  }
    nacos {
    serverAddr = "localhost"
    namespace = ""
    cluster = "default"
  }
}
config {
  type = "nacos"
  file {
    name = "file.conf"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
  }
    nacos {
    serverAddr = "localhost"
    namespace = ""
    cluster = "default"
  }
}

package org.test.config;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import com.alibaba.druid.pool.DruidDataSource;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;

import io.seata.rm.datasource.DataSourceProxy;
import io.seata.spring.annotation.GlobalTransactionScanner;

@Configuration
public class SeataAutoConfig {
	@Autowired(required = true)
	private DataSourceProperties dataSourceProperties;
	private final static Logger logger = LoggerFactory.getLogger(SeataAutoConfig.class);

	@Bean(name = "dataSource") // 声明其为Bean实例
	@Primary // 在同样的DataSource中，首先使用被标注的DataSource
	public DataSource druidDataSource() {
		DruidDataSource druidDataSource = new DruidDataSource();
		logger.info("dataSourceProperties.getUrl():{}",dataSourceProperties.getUrl());
		druidDataSource.setUrl(dataSourceProperties.getUrl());
		druidDataSource.setUsername(dataSourceProperties.getUsername());
		druidDataSource.setPassword(dataSourceProperties.getPassword());
		druidDataSource.setDriverClassName(dataSourceProperties.getDriverClassName());
		druidDataSource.setInitialSize(0);
		druidDataSource.setMaxActive(180);
		druidDataSource.setMaxWait(60000);
		druidDataSource.setMinIdle(0);
		druidDataSource.setValidationQuery("Select 1 from DUAL");
		druidDataSource.setTestOnBorrow(false);
		druidDataSource.setTestOnReturn(false);
		druidDataSource.setTestWhileIdle(true);
		druidDataSource.setTimeBetweenEvictionRunsMillis(60000);
		druidDataSource.setMinEvictableIdleTimeMillis(25200000);
		druidDataSource.setRemoveAbandoned(true);
		druidDataSource.setRemoveAbandonedTimeout(1800);
		druidDataSource.setLogAbandoned(true);
		logger.info("装载dataSource........");
		return druidDataSource;
	}

	/**
	 * init datasource proxy
	 *
	 * @Param: druidDataSource datasource bean instance
	 * @Return: DataSourceProxy datasource proxy
	 */
	@Bean
	public DataSourceProxy dataSourceProxy(DataSource dataSource) {
		logger.info("代理dataSource........");
		return new DataSourceProxy(dataSource);
	}

	@Bean
	public SqlSessionFactory sqlSessionFactory(DataSourceProxy dataSourceProxy) throws Exception {
		MybatisSqlSessionFactoryBean factory = new MybatisSqlSessionFactoryBean();
		factory.setDataSource(dataSourceProxy);
        factory.setMapperLocations(new PathMatchingResourcePatternResolver()
            .getResources("classpath*:/mapper/*.xml"));
		return factory.getObject();
	}

	/**
	 * init global transaction scanner
	 *
	 * @Return: GlobalTransactionScanner
	 */
	@Bean
	public GlobalTransactionScanner globalTransactionScanner() {
		logger.info("配置seata........");
		return new GlobalTransactionScanner("test-service", "test-group");
	}
}

/*
 * Copyright (c) 2011-2020, baomidou (jobob@qq.com).
 * <p>
 * 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
 * <p>
 * https://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.baomidou.mybatisplus.autoconfigure;


import com.baomidou.mybatisplus.core.MybatisConfiguration;
import com.baomidou.mybatisplus.core.config.GlobalConfig;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import com.baomidou.mybatisplus.core.incrementer.IKeyGenerator;
import com.baomidou.mybatisplus.core.injector.ISqlInjector;
import com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.mapping.DatabaseIdProvider;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.scripting.LanguageDriver;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.type.TypeHandler;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.mapper.MapperFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.boot.autoconfigure.AutoConfigurationPackages;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;

import javax.sql.DataSource;
import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;

/**
 * {@link EnableAutoConfiguration Auto-Configuration} for Mybatis. Contributes a
 * {@link SqlSessionFactory} and a {@link SqlSessionTemplate}.
 * <p>
 * If {@link org.mybatis.spring.annotation.MapperScan} is used, or a
 * configuration file is specified as a property, those will be considered,
 * otherwise this auto-configuration will attempt to register mappers based on
 * the interface definitions in or under the root auto-configuration package.
 * </p>
 * <p> copy from {@link org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration}</p>
 *
 * @author Eddú Meléndez
 * @author Josh Long
 * @author Kazuki Shimizu
 * @author Eduardo Macarrón
 */
@Configuration
@ConditionalOnClass({SqlSessionFactory.class, SqlSessionFactoryBean.class})
@ConditionalOnSingleCandidate(DataSource.class)
@EnableConfigurationProperties(MybatisPlusProperties.class)
@AutoConfigureAfter(DataSourceAutoConfiguration.class)
public class MybatisPlusAutoConfiguration implements InitializingBean {

    private static final Logger logger = LoggerFactory.getLogger(MybatisPlusAutoConfiguration.class);

    private final MybatisPlusProperties properties;

    private final Interceptor[] interceptors;

    private final TypeHandler[] typeHandlers;

    private final LanguageDriver[] languageDrivers;

    private final ResourceLoader resourceLoader;

    private final DatabaseIdProvider databaseIdProvider;

    private final List<ConfigurationCustomizer> configurationCustomizers;

    private final List<MybatisPlusPropertiesCustomizer> mybatisPlusPropertiesCustomizers;

    private final ApplicationContext applicationContext;


    public MybatisPlusAutoConfiguration(MybatisPlusProperties properties,
                                        ObjectProvider<Interceptor[]> interceptorsProvider,
                                        ObjectProvider<TypeHandler[]> typeHandlersProvider,
                                        ObjectProvider<LanguageDriver[]> languageDriversProvider,
                                        ResourceLoader resourceLoader,
                                        ObjectProvider<DatabaseIdProvider> databaseIdProvider,
                                        ObjectProvider<List<ConfigurationCustomizer>> configurationCustomizersProvider,
                                        ObjectProvider<List<MybatisPlusPropertiesCustomizer>> mybatisPlusPropertiesCustomizerProvider,
                                        ApplicationContext applicationContext) {
        this.properties = properties;
        this.interceptors = interceptorsProvider.getIfAvailable();
        this.typeHandlers = typeHandlersProvider.getIfAvailable();
        this.languageDrivers = languageDriversProvider.getIfAvailable();
        this.resourceLoader = resourceLoader;
        this.databaseIdProvider = databaseIdProvider.getIfAvailable();
        this.configurationCustomizers = configurationCustomizersProvider.getIfAvailable();
        this.mybatisPlusPropertiesCustomizers = mybatisPlusPropertiesCustomizerProvider.getIfAvailable();
        this.applicationContext = applicationContext;
    }

    @Override
    public void afterPropertiesSet() {
        if (!CollectionUtils.isEmpty(mybatisPlusPropertiesCustomizers)) {
            mybatisPlusPropertiesCustomizers.forEach(i -> i.customize(properties));
        }
        checkConfigFileExists();
    }

    private void checkConfigFileExists() {
        if (this.properties.isCheckConfigLocation() && StringUtils.hasText(this.properties.getConfigLocation())) {
            Resource resource = this.resourceLoader.getResource(this.properties.getConfigLocation());
            Assert.state(resource.exists(),
                "Cannot find config location: " + resource + " (please add config file or check your Mybatis configuration)");
        }
    }

    @SuppressWarnings("SpringJavaInjectionPointsAutowiringInspection")
    @Bean
    @ConditionalOnMissingBean
    public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
        // TODO 使用 MybatisSqlSessionFactoryBean 而不是 SqlSessionFactoryBean
        MybatisSqlSessionFactoryBean factory = new MybatisSqlSessionFactoryBean();
        factory.setDataSource(dataSource);
        factory.setVfs(SpringBootVFS.class);
        if (StringUtils.hasText(this.properties.getConfigLocation())) {
            factory.setConfigLocation(this.resourceLoader.getResource(this.properties.getConfigLocation()));
        }
        applyConfiguration(factory);
        if (this.properties.getConfigurationProperties() != null) {
            factory.setConfigurationProperties(this.properties.getConfigurationProperties());
        }
        if (!ObjectUtils.isEmpty(this.interceptors)) {
            factory.setPlugins(this.interceptors);
        }
        if (this.databaseIdProvider != null) {
            factory.setDatabaseIdProvider(this.databaseIdProvider);
        }
        if (StringUtils.hasLength(this.properties.getTypeAliasesPackage())) {
            factory.setTypeAliasesPackage(this.properties.getTypeAliasesPackage());
        }
        if (this.properties.getTypeAliasesSuperType() != null) {
            factory.setTypeAliasesSuperType(this.properties.getTypeAliasesSuperType());
        }
        if (StringUtils.hasLength(this.properties.getTypeHandlersPackage())) {
            factory.setTypeHandlersPackage(this.properties.getTypeHandlersPackage());
        }
        if (!ObjectUtils.isEmpty(this.typeHandlers)) {
            factory.setTypeHandlers(this.typeHandlers);
        }
        if (!ObjectUtils.isEmpty(this.properties.resolveMapperLocations())) {
            factory.setMapperLocations(this.properties.resolveMapperLocations());
        }

        // TODO 对源码做了一定的修改(因为源码适配了老旧的mybatis版本,但我们不需要适配)
        Class<? extends LanguageDriver> defaultLanguageDriver = this.properties.getDefaultScriptingLanguageDriver();
        if (!ObjectUtils.isEmpty(this.languageDrivers)) {
            factory.setScriptingLanguageDrivers(this.languageDrivers);
        }
        Optional.ofNullable(defaultLanguageDriver).ifPresent(factory::setDefaultScriptingLanguageDriver);

        // TODO 自定义枚举包
        if (StringUtils.hasLength(this.properties.getTypeEnumsPackage())) {
            factory.setTypeEnumsPackage(this.properties.getTypeEnumsPackage());
        }
        // TODO 此处必为非 NULL
        GlobalConfig globalConfig = this.properties.getGlobalConfig();
        // TODO 注入填充器
        if (this.applicationContext.getBeanNamesForType(MetaObjectHandler.class,
            false, false).length > 0) {
            MetaObjectHandler metaObjectHandler = this.applicationContext.getBean(MetaObjectHandler.class);
            globalConfig.setMetaObjectHandler(metaObjectHandler);
        }
        // TODO 注入主键生成器
        if (this.applicationContext.getBeanNamesForType(IKeyGenerator.class, false,
            false).length > 0) {
            IKeyGenerator keyGenerator = this.applicationContext.getBean(IKeyGenerator.class);
            globalConfig.getDbConfig().setKeyGenerator(keyGenerator);
        }
        // TODO 注入sql注入器
        if (this.applicationContext.getBeanNamesForType(ISqlInjector.class, false,
            false).length > 0) {
            ISqlInjector iSqlInjector = this.applicationContext.getBean(ISqlInjector.class);
            globalConfig.setSqlInjector(iSqlInjector);
        }
        // TODO 设置 GlobalConfig 到 MybatisSqlSessionFactoryBean
        factory.setGlobalConfig(globalConfig);
        return factory.getObject();
    }

    // TODO 入参使用 MybatisSqlSessionFactoryBean
    private void applyConfiguration(MybatisSqlSessionFactoryBean factory) {
        // TODO 使用 MybatisConfiguration
        MybatisConfiguration configuration = this.properties.getConfiguration();
        if (configuration == null && !StringUtils.hasText(this.properties.getConfigLocation())) {
            configuration = new MybatisConfiguration();
        }
        if (configuration != null && !CollectionUtils.isEmpty(this.configurationCustomizers)) {
            for (ConfigurationCustomizer customizer : this.configurationCustomizers) {
                customizer.customize(configuration);
            }
        }
        factory.setConfiguration(configuration);
    }

    @Bean
    @ConditionalOnMissingBean
    public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
        ExecutorType executorType = this.properties.getExecutorType();
        if (executorType != null) {
            return new SqlSessionTemplate(sqlSessionFactory, executorType);
        } else {
            return new SqlSessionTemplate(sqlSessionFactory);
        }
    }

    /**
     * This will just scan the same base package as Spring Boot does. If you want more power, you can explicitly use
     * {@link org.mybatis.spring.annotation.MapperScan} but this will get typed mappers working correctly, out-of-the-box,
     * similar to using Spring Data JPA repositories.
     */
    public static class AutoConfiguredMapperScannerRegistrar implements BeanFactoryAware, ImportBeanDefinitionRegistrar {

        private BeanFactory beanFactory;

        @Override
        public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {

            if (!AutoConfigurationPackages.has(this.beanFactory)) {
                logger.debug("Could not determine auto-configuration package, automatic mapper scanning disabled.");
                return;
            }

            logger.debug("Searching for mappers annotated with @Mapper");

            List<String> packages = AutoConfigurationPackages.get(this.beanFactory);
            if (logger.isDebugEnabled()) {
                packages.forEach(pkg -> logger.debug("Using auto-configuration base package '{}'", pkg));
            }

            BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(MapperScannerConfigurer.class);
            builder.addPropertyValue("processPropertyPlaceHolders", true);
            builder.addPropertyValue("annotationClass", Mapper.class);
            builder.addPropertyValue("basePackage", StringUtils.collectionToCommaDelimitedString(packages));
            BeanWrapper beanWrapper = new BeanWrapperImpl(MapperScannerConfigurer.class);
            Stream.of(beanWrapper.getPropertyDescriptors())
                // Need to mybatis-spring 2.0.2+
                .filter(x -> x.getName().equals("lazyInitialization")).findAny()
                .ifPresent(x -> builder.addPropertyValue("lazyInitialization", "${mybatis.lazy-initialization:false}"));
            registry.registerBeanDefinition(MapperScannerConfigurer.class.getName(), builder.getBeanDefinition());
        }

        @Override
        public void setBeanFactory(BeanFactory beanFactory) {
            this.beanFactory = beanFactory;
        }
    }

    /**
     * If mapper registering configuration or mapper scanning configuration not present, this configuration allow to scan
     * mappers based on the same component-scanning path as Spring Boot itself.
     */
    @Configuration
    @Import(AutoConfiguredMapperScannerRegistrar.class)
    @ConditionalOnMissingBean({MapperFactoryBean.class, MapperScannerConfigurer.class})
    public static class MapperScannerRegistrarNotFoundConfiguration implements InitializingBean {

        @Override
        public void afterPropertiesSet() {
            logger.debug(
                "Not found configuration for registering mapper bean using @MapperScan, MapperFactoryBean and MapperScannerConfigurer.");
        }
    }
}