Context

Dubbo context

All environment information of during the current call will put into the context,and all configuration information will convert the parameters of URL instance,Ref to the column of URL parameters at the schema configuration reference book

RpcContext is a temporary status recorder of ThreadLocal,when accept RPC request or send RPC request,The RpcContext will be changed.Such as: A call B and B call C. On B machine,before B call C,the RpcContext will record the information of A call B.After B call C,the RpcContext record the information of B call C.

At service consumer

// remote invoke
xxxService.xxx();
// if return true,then the current side is consumer.
boolean isConsumerSide = RpcContext.getContext().isConsumerSide();
// get the provider ip address of the last invoke.
String serverIP = RpcContext.getContext().getRemoteHost();
// because all configuration information has convert the URL's  parameters,so at this place can get the application parameter value.
String application = RpcContext.getContext().getUrl().getParameter("application");
// Note:every rpc invoke,then context will be changed.
yyyService.yyy();

At service provider

public class XxxServiceImpl implements XxxService {

    public void xxx() {
        // if return true,then the current side is provider.
        boolean isProviderSide = RpcContext.getContext().isProviderSide();
        // get the invoker ip
        String clientIP = RpcContext.getContext().getRemoteHost();
        // because all configuration information has convert the URL's  parameters,so at this place can get the application parameter value.
        String application = RpcContext.getContext().getUrl().getParameter("application");
        // Note:every rpc invoke,then context will be changed.
        yyyService.yyy();;
    }
}

Last modified January 22, 2021: Merge branch 'master' of https://github.com/apache/dubbo-website (f48eac9)