[provider side]support returning implicit results

[ludvik]

This is a ticket to extend DUBBO's implicit parameter mechanism described in current DUBBO documentation:
http://alibaba.github.io/dubbo-doc-static/User+Guide-zh.htm#UserGuide-zh-%E9%9A%90%E5%BC%8F%E4%BC%A0%E5%8F%82

In-short, the pattern of the above document is:
[consumer side] set attachments ----> [provider side] get attachments

this ticket is intended to extend this mechanism to:
[provider side(before return)] set attachments --> [consumer side] get attachments

provider side

public class XxxServiceImpl implements XxxService {

    public void xxx() { // 服务方法实现(service implementation)
        // ....
        // 返回之前 （before return）
        RpcContext.getContext().setAttachment("userToken", "0001"); 
    }
}

consumer side

xxxService.xxx();
String userToken = RpcContext.getContext().getAttachment("userToken"); 

[diecui1202]

Could you share us the scenario about using RpcContext attachment to return results?

[ralf0131]

Hi, I think the scenario is described in #68

[diecui1202]

@ludvik This feature is provided in 2.6.3, which is on the releasing vote thread.

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