Spring Cloud Stream Core学习笔记

心已赠人 2023-06-28 08:39 18阅读 0赞

### 文章目录 ###

*  官网
 *  构造图
 *  Binder
 *   *  参考
     *  SPI存在的意义
 *  Spring Cloud Stream注解
 *  配置
 *  批量预处理能力
 *   *  参考文章
 *  Dead-Letter Queue Processing
 *   *  参考文章

# 官网 #

*  [Spring Cloud Stream Reference Guide][]

# 构造图 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA_size_16_color_FFFFFF_t_70]  
使用Binder作为中间件进行连接应用以及外界

# Binder #

一谈到中间件就得说道spi，跟api一样也是接口，但是spi用于进行扩展的接口。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA_size_16_color_FFFFFF_t_70 1]  
**相关配置**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA_size_16_color_FFFFFF_t_70 2]  
**扩展接口**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA_size_16_color_FFFFFF_t_70 3]  
**路径发现**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA_size_16_color_FFFFFF_t_70 4]

## 参考 ##

*  [Binder SPI][]

## SPI存在的意义 ##

比如这里面也支持kafka，当实现完功能之后只需要切换不同的配置，即可更换不同的实现。这就是spi的用处。

# Spring Cloud Stream注解 #

<table> 
 <thead> 
  <tr> 
   <th>注解</th> 
   <th>作用</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>@EnableBinding （参数看表格第三行）</td> 
   <td><img src="https://img-blog.csdnimg.cn/20200108104424562.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA==,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></td> 
  </tr> 
  <tr> 
   <td>@Input,@OutPut当注入MessageChannel需要注意</td> 
   <td><img src="https://img-blog.csdnimg.cn/20200108111839712.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA==,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"><img src="https://img-blog.csdnimg.cn/20200108111850326.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA==,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></td> 
  </tr> 
  <tr> 
   <td>Source, Sink, and Processor</td> 
   <td><img src="https://img-blog.csdnimg.cn/20200108112343295.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA==,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></td> 
  </tr> 
  <tr> 
   <td>@StreamListener</td> 
   <td><img src="https://img-blog.csdnimg.cn/20200108112703317.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA==,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></td> 
  </tr> 
  <tr> 
   <td>@InboundChannelAdapter（下面那个方法变压器，就是对消息进行加工）</td> 
   <td><img src="https://img-blog.csdnimg.cn/20200108113709294.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA==,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></td> 
  </tr> 
  <tr> 
   <td>@Payload, @Headers and @Header,@SendTo</td> 
   <td><img src="https://img-blog.csdnimg.cn/20200108114141292.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA==,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></td> 
  </tr> 
 </tbody> 
</table>

# 配置 #

spring:
          binders:
            rabbitmq:
              type: rabbit

这个就是SPI指定rabbit扩展

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA_size_16_color_FFFFFF_t_70 5]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA_size_16_color_FFFFFF_t_70 6]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA_size_16_color_FFFFFF_t_70 7]  
还有包括rabbitmq的配置咯~

**官网配置**

1.  [Consumer properties][]
2.  [Producer Properties][]

# 批量预处理能力 #

比如说大批量处理消息，可以通过

*  增加消费者数量
 *  提高消费者消费单个消息的速度
 *  让消费者有更大的 prefetch 值

**prefetch 值以及加大消费者的参数**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODMzNjY1OA_size_16_color_FFFFFF_t_70 8]

## 参考文章 ##

*  [Spring Cloud Stream 进阶配置——高吞吐量（三）——批量预取消息(prefetch)][Spring Cloud Stream _prefetch]

# Dead-Letter Queue Processing #

mq私信队列的处理，这里就要谈到TTL（Time To Live），消息的有效时间。当超过ttl之后会失效处理。

**消息没有被及时消费的原因**：

a.消息被拒绝（basic.reject/ basic.nack）并且不再重新投递 requeue=false

b.TTL(time-to-live) 消息超时未消费

c.达到最大队列长度

这个本人没有详细的动手操作过，只能靠网上文章意淫了，西西~

就是当队列里头有死信的时候，会发布到对应设置的Exchange进行处理，路由到另一个队列。

## 参考文章 ##

*  [RabbitMQ 消费端限流、TTL、死信队列][RabbitMQ _TTL]

[Spring Cloud Stream Reference Guide]: https://docs.spring.io/spring-cloud-stream/docs/Chelsea.SR2/reference/htmlsingle/index.html#_spring_cloud_stream_core
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[Binder SPI]: https://docs.spring.io/spring-cloud-stream/docs/Chelsea.SR2/reference/htmlsingle/index.html#_binder_spi
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[Consumer properties]: https://docs.spring.io/spring-cloud-stream/docs/Chelsea.SR2/reference/htmlsingle/index.html#_consumer_properties
[Producer Properties]: https://docs.spring.io/spring-cloud-stream/docs/Chelsea.SR2/reference/htmlsingle/index.html#_producer_properties
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[Spring Cloud Stream _prefetch]: https://www.jianshu.com/p/71505eb2e4b1
[RabbitMQ _TTL]: https://www.cnblogs.com/haixiang/p/10905189.html