Add remoteApplicationName in RpcContext (#3816)

Author: yizhenqiang

dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/RpcContext.java

@@ -85,6 +85,9 @@ protected RpcContext initialValue() {
     private InetSocketAddress localAddress;
 
     private InetSocketAddress remoteAddress;
+
+    private String remoteApplicationName;
+
     @Deprecated
     private List<Invoker<?>> invokers;
     @Deprecated
@@ -149,6 +152,7 @@ public RpcContext copyOf() {
         copy.arguments = this.arguments;
         copy.localAddress = this.localAddress;
         copy.remoteAddress = this.remoteAddress;
+        copy.remoteApplicationName = this.remoteApplicationName;
         copy.invokers = this.invokers;
         copy.invoker = this.invoker;
         copy.invocation = this.invocation;
@@ -407,6 +411,15 @@ public RpcContext setRemoteAddress(InetSocketAddress address) {
         return this;
     }
 
+    public String getRemoteApplicationName() {
+        return remoteApplicationName;
+    }
+
+    public RpcContext setRemoteApplicationName(String remoteApplicationName) {
+        this.remoteApplicationName = remoteApplicationName;
+        return this;
+    }
+
     /**
      * get remote address string.
      *

dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/ContextFilter.java

@@ -29,6 +29,8 @@
 import java.util.HashMap;
 import java.util.Map;
 
+import static org.apache.dubbo.common.Constants.REMOTE_APPLICATION_KEY;
+
 /**
  * ContextFilter set the provider RpcContext with invoker, invocation, local port it is using and host for
  * current execution thread.
@@ -59,8 +61,8 @@ public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcExcept
                 .setInvoker(invoker)
                 .setInvocation(invocation)
 //                .setAttachments(attachments)  // merged from dubbox
-                .setLocalAddress(invoker.getUrl().getHost(),
-                        invoker.getUrl().getPort());
+                .setLocalAddress(invoker.getUrl().getHost(), invoker.getUrl().getPort())
+                .setRemoteApplicationName(invoker.getUrl().getParameter(REMOTE_APPLICATION_KEY));
 
         // merged from dubbox
         // we may already added some attachments into RpcContext before this filter (e.g. in rest protocol)