/**
 * Create a bean of tracing DataSource.
 *
 * @param tracingProperties tracing Properties
 * @return tracing DataSource
 */
@Bean("tracingDataSource")
//spring中注入bean name 为tracingDataSource的job数据库连接信息
public DataSource tracingDataSource(final TracingProperties tracingProperties) {
    //获取elastic-job 数据库配置
    DataSourceProperties dataSource = tracingProperties.getDataSource();
    if (dataSource == null) {
        return null;
    }
    HikariDataSource tracingDataSource = new HikariDataSource();
    tracingDataSource.setJdbcUrl(dataSource.getUrl());
    BeanUtils.copyProperties(dataSource, tracingDataSource);
    return tracingDataSource;
}


/**
 * Create a bean of tracing configuration.
 *
 * @param dataSource required by constructor
 * @param tracingDataSource tracing ataSource
 * @return a bean of tracing configuration
 */
@Bean
@ConditionalOnBean(DataSource.class)
@ConditionalOnProperty(name = "elasticjob.tracing.type", havingValue = "RDB")
public TracingConfiguration<DataSource> tracingConfiguration(final DataSource dataSource, @Nullable final DataSource tracingDataSource) {
    /**
     * dataSource 是业务数据库
     * tracingDataSource 是job数据库
     * 当配置elasticjob.tracing.type = RDB时，如果单独配置job数据库是，默认使用job数据库作为job运行轨迹的记录
     * 但这边同时业务数据库和job追踪数据库同时注入是，mybatis-plus 结合@Table 使用的时候，很有可能找不到正确对应的数据源
     */
    DataSource ds = tracingDataSource;
    if (ds == null) {
        ds = dataSource;
    }
    return new TracingConfiguration<>("RDB", ds);
}