As each service defines a different format, two different transformations have to be performed before sending the message to the correct service.
由于每个服务定义了不同的格式,在发送消息给正确的服务之前必须完成两种不同的转换。
2
The caller can't just put any request messageformat on any request channel; it has to know exactly the right messageformat and channel for the specific service it wishes to invoke.