TraceAsyncRestTemplate - 请求参数和跟踪

Question

我在spring-boot应用程序中使用spring-cloud-slueth-core-1.3.3库中的TraceAsyncRestTemplate来实现对请求的并行处理。

我的RX I / O调度程序线程中有我的请求ID和其他请求参数（使用Rx Java并将其配置为复制请求上下文）但是AsyncRestTemplate一旦调出I / O调度程序线程，请求参数不再存在于它们中。经过调查后，我意识到这种情况正在发生，因为AsyncRestTemplate使用Apache HttpAsynClient来启动没有父上下文的子线程（I / O转发线程）。

记录快照：

Rx Java Threads有请求Context ====＆gt;

  

2018-05-09 09：30：38,947 [RxIoScheduler-4] INFO APP = abcd | REQUEST_ID = IWAN3 | TRACE_ID = f70f4f94824b83dc | SPAN_ID = f70f4f94824b83dc | CLIENT_ID = CLIENTID | CLIENT_VERSION = 1.0 | UUID = 9c68ac15-148f-4a4c-aca1-704836f341ad

I / O dsipatcher缺少请求上下文=====＆gt;

  

2018-05-09 09：30：38,454 [I / O调度员1] DEBUG APP = abcd | REQUEST_ID = | TRACE_ID = | SPAN_ID = | CLIENT_ID = | CLIENT_VERSION = | UUID =

我在配置中使用了bean HttpComponentsAsynClientHttpRequestFactory，它启用了HttpAsynClient：

private AsyncClientHttpRequestFactory asyncClientHttpRequestFactory() 
{
    return new HttpComponentsAsyncClientHttpRequestFactory();
}

如果我没有配置这个bean，那么TraceAsyncRestTemplate会尝试使用DefaultRestTemplate，并开始执行Synchronized。

来自 Slueth lib的配置：

private TraceAsyncClientHttpRequestFactoryWrapper traceAsyncClientHttpRequestFactory() {
    ClientHttpRequestFactory clientFactory = this.clientHttpRequestFactory;
    AsyncClientHttpRequestFactory asyncClientFactory = this.asyncClientHttpRequestFactory;
    if (clientFactory == null) {
        clientFactory = this.defaultClientHttpRequestFactory(this.tracer);
    }

    if (asyncClientFactory == null) {
        asyncClientFactory = clientFactory instanceof AsyncClientHttpRequestFactory ? (AsyncClientHttpRequestFactory)clientFactory : this.defaultClientHttpRequestFactory(this.tracer);
    }

    return new TraceAsyncClientHttpRequestFactoryWrapper(this.tracer, this.spanInjector, (AsyncClientHttpRequestFactory)asyncClientFactory, (ClientHttpRequestFactory)clientFactory, this.httpTraceKeysInjector);
}