Re-implement the status page for the new task model

pkg/analysis_server/lib/src/server/http_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.
 
 library http.server;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:analysis_server/src/channel/web_socket_channel.dart';
 import 'package:analysis_server/src/get_handler.dart';
 import 'package:analysis_server/src/socket_server.dart';
+import 'package:analysis_server/src/status/get_handler.dart' as newHandler;
+import 'package:analyzer/src/generated/engine.dart';
 
 /**
  * Instances of the class [HttpServer] implement a simple HTTP server. The
  * primary responsibility of this server is to listen for an UPGRADE request and
  * to start an analysis server.
  */
 class HttpAnalysisServer {
   /**
    * Number of lines of print output to capture.
    */
   static const int MAX_PRINT_BUFFER_LENGTH = 1000;
 
   /**
    * An object that can handle either a WebSocket connection or a connection
    * to the client over stdio.
    */
   SocketServer socketServer;
 
   /**
    * An object that can handle GET requests.
    */
   GetHandler getHandler;
 
   /**
+   * An object that can handle GET requests when the new task model is in use.
+   */
+  newHandler.GetHandler newGetHandler;
+
+  /**
    * Future that is completed with the HTTP server once it is running.
    */
   Future<HttpServer> _server;
 
   /**
    * Last PRINT_BUFFER_LENGTH lines printed.
    */
   List<String> _printBuffer = <String>[];
 
   /**
@@ skipping 23 matching lines @@
    */
   void serveHttp(int port) {
     _server = HttpServer.bind(InternetAddress.LOOPBACK_IP_V4, port);
     _server.then(_handleServer);
   }
 
   /**
    * Handle a GET request received by the HTTP server.
    */
   void _handleGetRequest(HttpRequest request) {
-    if (getHandler == null) {
-      getHandler = new GetHandler(socketServer, _printBuffer);
+    if (AnalysisEngine.instance.useTaskModel) {
+      if (newGetHandler == null) {
+        newGetHandler = new newHandler.GetHandler(socketServer, _printBuffer);
+      }
+      newGetHandler.handleGetRequest(request);
+    } else {
+      if (getHandler == null) {
+        getHandler = new GetHandler(socketServer, _printBuffer);
+      }
+      getHandler.handleGetRequest(request);
     }
-    getHandler.handleGetRequest(request);
   }
 
   /**
    * Attach a listener to a newly created HTTP server.
    */
   void _handleServer(HttpServer httServer) {
     httServer.listen((HttpRequest request) {
       List<String> updateValues = request.headers[HttpHeaders.UPGRADE];
       if (updateValues != null && updateValues.indexOf('websocket') >= 0) {
         WebSocketTransformer.upgrade(request).then((WebSocket websocket) {
@@ skipping 22 matching lines @@
    */
   void _returnUnknownRequest(HttpRequest request) {
     HttpResponse response = request.response;
     response.statusCode = HttpStatus.NOT_FOUND;
     response.headers.contentType =
         new ContentType("text", "plain", charset: "utf-8");
     response.write('Not found');
     response.close();
   }
 }