java - Apache Camel : How to send two http requests in parallel and wait for the responses?

Question

在我定义路由的 Apache Camel 中，我如何并行发送两个或多个 http 请求并等待它们的“ future ”以获取响应以进行进一步处理，就像在 Java 中使用 AsyncHttpClient 一样？

AsyncHttpClient asyncHttpClient = new DefaultAsyncHttpClient();
Future<Response> f = asyncHttpClient.prepareGet("http://www.example.com/").execute();
Response r = f.get();

仅针对上下文，以下路由调用 GET 联系人 http 调用并同步返回响应。

from("direct:getContact")
.to("http://host:port/contacts/1453")

Answer 1

尝试将您的路线分成许多更小的路线。然后您可以在那里执行必要的解码。

参见 question about unmarshalling http response

from("direct:getContact")
    .process(new Processor() {
        @Override
        public void process(Exchange exchange) throws Exception {
            CamelContext context = exchange.getContext();
            ProducerTemplate producerTemplate = context.createProducerTemplate();

            // Asynchronous call to internal route
            Future<Contact> contact = 
                producerTemplate.asyncRequestBody("direct:invokeSomeRestApi", null, Contact.class);  

            // Do rest of the work
            exchange.getOut().setBody(contact.get());
        }
    });

// Unmarshalling REST response
JacksonDataFormat jacksonDataFormat = new JacksonDataFormat();
jacksonDataFormat.setUnmarshalType(Contact.class);

// Internal route definition
from("direct:invokeSomeRestApi")
    .to("http://localhost:8080/api/contact/2345")
    .unmarshal(jacksonDataFormat);