event: - code: -1 firstAppearTime: "2021-03-05T08:35:03Z" lastTransitionTime: "2021-03-05T08:35:06Z" message: The number of ready pods is too small[] 147 > Nacos 生态 status: false - code: 200 firstAppearTime: 在业务系统中必然存在⼀些敏感的服务，这些服务通常会涉及到交易以及用户敏感数据的变化，因 此会严格限制调用方。这个问题在单体架构中几乎不用考虑，因为服务之间的调用是开发者代码控 制的，只有有严格的 Code review 和发布流程，就可以规避服务错调用。但是在微服务架构中就会 被无限放大，因为服务已经发布到注册中心上，理论上任何能从注册中心获取该服务节点信息的客 户端，都可以随意访问这些敏感服 限流来提高系统的限流能力。 Nacos 的 open API 都是基于 http 协议，可以很方便地使用 nginx 来做限流，不需要自身再开 发限流模块来支持各种限流策略。nginx 的基本使用以及 nginx+lua 模块安装网上资源很丰富，这 里就不再介绍。 Nacos 每个接口执行的代价不尽相同，⼀般来说写操作代价比读操作大，与此同时还有高频操作和 低频操作之分，SDK 调用的接口⼀般来说是高频接口，容易出现问题，所以在生产环境需要将这些

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. How to use the example code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 14.1. Markup hierarchy and code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 18.6. Generating HTML markup from code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. How to use the example code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 14.1. Markup hierarchy and code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201 18.6. Generating HTML markup from code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. How to use the example code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 14.1. Markup hierarchy and code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192 18.6. Generating HTML markup from code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. How to use the example code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 14.1. Markup hierarchy and code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191 18.6. Generating HTML markup from code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Developing Your First Spring Boot Application Creating the POM Adding Classpath Dependencies Writing the Code The @RestController and @RequestMapping Annotations The @EnableAutoConfiguration Annotation The “main” without the Parent POM Using the Spring Boot Maven Plugin Gradle Ant Starters 14. Structuring Your Code Using the “default” Package Locating the Main Application Class 15. Configuration Classes Importing EntityManager in View Spring Data JDBC Using H2’s Web Console Changing the H2 Console’s Path Using jOOQ Code Generation Using DSLContext jOOQ SQL Dialect Customizing jOOQ 32. Working with NoSQL Technologies

Dependencies ....................................................................... 18 11.3. Writing the Code .............................................................................................. 18 ......................................................................... 27 14. Structuring Your Code ................................................................................................. ................................. 121 Spring Boot Reference Guide 2.1.8.RELEASE Spring Boot vi Code Generation ......................................................................................

ApplicationContext from a web application ........................................................ 40 3.20. Glue code and the evil singleton .......................................................................... decouple code implementing functionality that should logically speaking be separated. Using source-level metadata functionality you can incorporate all kinds of behavioral information into your code, a little implementation is not just any implementation, it provides a clean separation between domain model code and web forms and allows you to use all the other features of the Spring Framework like validation

ApplicationContext from a web application ........................................................ 40 3.20. Glue code and the evil singleton .......................................................................... decouple code implementing functionality that should logically speaking be separated. Using source-level metadata functionality you can incorporate all kinds of behavioral information into your code, a little implementation is not just any implementation, it provides a clean separation between domain model code and web forms and allows you to use all the other features of the Spring Framework like validation

ApplicationContext from a web application ........................................................ 51 3.20. Glue code and the evil singleton .......................................................................... decouple code implementing functionality that should logically speaking be separated. Using source-level metadata functionality you can incorporate all kinds of behavioral information into your code, a little implementation is not just any implementation, it provides a clean separation between domain model code and web forms and allows you to use all the other features of the Spring Framework like validation