Springboot项目之mybatis-plus多容器分布式部署id重复问题之源码解析

# 设置随机
mybatis-plus.global-config.worker-id: ${random.int(1,31)}
mybatis-plus.global-config.datacenter-id: ${random.int(1,31)}

源码解析：MybatisSqlSessionFactoryBean

重点：new MybatisSqlSessionFactoryBuilder().build(targetConfiguration); -->IdWorker.setIdentifierGenerator(identifierGenerator);

protected SqlSessionFactory buildSqlSessionFactory() throws Exception {
    final MybatisConfiguration targetConfiguration;
    // TODO 使用 MybatisXmlConfigBuilder 而不是 XMLConfigBuilder
    MybatisXMLConfigBuilder xmlConfigBuilder = null;
    if (this.configuration != null) {
        targetConfiguration = this.configuration;
        if (targetConfiguration.getVariables() == null) {
            targetConfiguration.setVariables(this.configurationProperties);
        } else if (this.configurationProperties != null) {
            targetConfiguration.getVariables().putAll(this.configurationProperties);
        }
    } else if (this.configLocation != null) {
        // TODO 使用 MybatisXMLConfigBuilder
        xmlConfigBuilder = new MybatisXMLConfigBuilder(this.configLocation.getInputStream(), null, this.configurationProperties);
        targetConfiguration = xmlConfigBuilder.getConfiguration();
    } else {
        LOGGER.debug(() -> "Property 'configuration' or 'configLocation' not specified, using default MyBatis Configuration");
        // TODO 使用 MybatisConfiguration
        targetConfiguration = new MybatisConfiguration();
        Optional.ofNullable(this.configurationProperties).ifPresent(targetConfiguration::setVariables);
    }
    // TODO 无配置启动所必须的
    this.globalConfig = Optional.ofNullable(this.globalConfig).orElseGet(GlobalConfigUtils::defaults);
    this.globalConfig.setDbConfig(Optional.ofNullable(this.globalConfig.getDbConfig()).orElseGet(GlobalConfig.DbConfig::new));
    // TODO 初始化 id-work 以及 打印骚东西
    targetConfiguration.setGlobalConfig(this.globalConfig);
    // TODO 自定义枚举类扫描处理
    if (hasLength(this.typeEnumsPackage)) {
        Set