Generate constants in server as we do in plugin

pkg/analysis_server/lib/src/domain_server.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:analysis_server/protocol/protocol.dart';
+import 'package:analysis_server/protocol/protocol_constants.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/analysis_server.dart';
-import 'package:analysis_server/src/constants.dart';
 
 /**
  * Instances of the class [ServerDomainHandler] implement a [RequestHandler]
  * that handles requests in the server domain.
  */
 class ServerDomainHandler implements RequestHandler {
   /**
    * The analysis server that is using this handler to process requests.
    */
   final AnalysisServer server;
 
   /**
    * Initialize a newly created handler to handle requests for the given [server].
    */
   ServerDomainHandler(this.server);
 
   /**
    * Return the version number of the analysis server.
    */
   Response getVersion(Request request) {
     return new ServerGetVersionResult(AnalysisServer.VERSION)
         .toResponse(request.id);
   }
 
   @override
   Response handleRequest(Request request) {
     try {
       String requestName = request.method;
-      if (requestName == SERVER_GET_VERSION) {
+      if (requestName == SERVER_REQUEST_GET_VERSION) {
         return getVersion(request);
-      } else if (requestName == SERVER_SET_SUBSCRIPTIONS) {
+      } else if (requestName == SERVER_REQUEST_SET_SUBSCRIPTIONS) {
         return setSubscriptions(request);
-      } else if (requestName == SERVER_SHUTDOWN) {
+      } else if (requestName == SERVER_REQUEST_SHUTDOWN) {
         return shutdown(request);
       }
     } on RequestFailure catch (exception) {
       return exception.response;
     }
     return null;
   }
 
   /**
    * Subscribe for services.
@@ skipping 10 matching lines @@
 
   /**
    * Cleanly shutdown the analysis server.
    */
   Response shutdown(Request request) {
     server.shutdown();
     Response response = new ServerShutdownResult().toResponse(request.id);
     return response;
   }
 }