October 2021
Beginner to intermediate
250 pages
7h 11m
Chinese
Content preview from 微服务与事件驱动架构
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170
｜
第
13
章
根据
schema
和事件定义将传入事件分类到它们自己定义的事件流中是很重要的。根据业
务目标分离这些事件，就像分离任何其他微服务的事件流一样。
13.3
集成第三方
“
请求
–
响应
”
API
事件驱动型微服务经常需要通过“请求
–
响应”协议与第三方
API
通信。“请求
–
响应”
模式能够很好地适配事件驱动型处理，请求和响应被简单地视为远程函数调用。微服务基
于事件驱动的逻辑调用
API
并
等待回复。在收到回复后，微服务将对其进行解析，确保其
符合预期的
schema
，并继续应用业务逻辑
，就像处理任何其他事件一样。图
13-3
展示了
这种处理的一个例子。
输入事件流
结果事件流
消费+请求
响应解析器
业务逻辑
生产者
微服务
外部“请求–
响应”端点
1) 消费事件
2) 发起请求
3) 接收响应
4) 解析响应并
引用业务逻辑
5) 生成输出事件
图 13-3：集成“请求 – 响应”API 到事件驱动的工作流中
以下源代码展示了使用阻塞式调用的微服务的逻辑操作。
while (true) { //无限循环处理
Event[] eventsToProcess = Consumer.consume("input-event-stream");
for (Event event: eventsToProcess) {
//对当前事件应用业务逻辑以生成必要的请求
Request request = generateRequest(event, ...);
//向外部端点发起请求。指定了超时、重试等参数值
//这段代码使用阻塞式调用来等待一个响应 ...
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