微服务框架ServiceComb源码解析之一——Consumer发起request请求

Consumer的rest client

consumer发送请求，主要是用Spring的RestTemplate,ServiceComb做了一层包装，兼容ServiceComb格式的uri，如cse://business/business/v1/channel/news/subscribe。包装类主要的类图如下，

以servicecomb-java-chassis项目下的demo例子，

如下是把cse://格式的uri调用过程中关键方法，

class ConsumerMain:
new Consumer().invokeBusiness("cse://business/business/v1", new ChannelRequestBase());

...
class Consumer:
ResponseEntity response = template.postForEntity(url, entity, AppClientDataRsp.class);

...
class RestTemplateWrapper:
getRestTemplate(url).postForEntity(url, request, responseType, uriVariables);
...
class RestTemplate:
(ResponseEntity)nonNull(this.execute(url, HttpMethod.POST, requestCallback, responseExtractor, uriVariables));

this.getUriTemplateHandler().expand(url, uriVariables);

...
abstract class AbstractUriTemplateHandler:
    public URI expand(String uriTemplate, Object... uriVariables) {
        URI url = this.expandInternal(uriTemplate, uriVariables);
        return this.insertBaseUrl(url);
    }
...
class CseUriTemplateHandler:
createUri(uriTemplate, uriComponents);