compatible with dledger

remoting/src/main/java/org/apache/rocketmq/remoting/netty/NettyRemotingAbstract.java

@@ -51,6 +51,7 @@ import org.apache.rocketmq.remoting.exception.RemotingTimeoutException;
 import org.apache.rocketmq.remoting.exception.RemotingTooMuchRequestException;
 import org.apache.rocketmq.remoting.protocol.RemotingCommand;
 import org.apache.rocketmq.remoting.protocol.RemotingSysResponseCode;
+import org.omg.PortableServer.RequestProcessingPolicy;
 
 public abstract class NettyRemotingAbstract {
 
@@ -200,7 +201,6 @@ public abstract class NettyRemotingAbstract {
                 public void run() {
                     try {
                         doBeforeRpcHooks(RemotingHelper.parseChannelRemoteAddr(ctx.channel()), cmd);
-                        AsyncNettyRequestProcessor processor = (AsyncNettyRequestProcessor)pair.getObject1();
                         final RemotingResponseCallback callback = new RemotingResponseCallback() {
                             @Override
                             public void callback(RemotingCommand response) {
@@ -221,7 +221,15 @@ public abstract class NettyRemotingAbstract {
                                 }
                             }
                         };
-                        processor.asyncProcessRequest(ctx, cmd, callback);
+                        if (pair.getObject1() instanceof AsyncNettyRequestProcessor) {
+                            AsyncNettyRequestProcessor processor = (AsyncNettyRequestProcessor)pair.getObject1();
+                            processor.asyncProcessRequest(ctx, cmd, callback);
+                        } else {
+                            NettyRequestProcessor processor = pair.getObject1();
+                            RemotingCommand response = processor.processRequest(ctx, cmd);
+                            doAfterRpcHooks(RemotingHelper.parseChannelRemoteAddr(ctx.channel()), cmd, response);
+                            callback.callback(response);
+                        }
                     } catch (Throwable e) {
                         log.error("process request exception", e);
                         log.error(cmd.toString());