Remove unused analysis contexts

pkg/analysis_server/lib/src/analysis_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 analysis.server;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_logger.dart';
 import 'package:analysis_server/src/channel.dart';
@@ skipping 20 matching lines @@
  * [AnalysisServer] instances to improve performance.
  */
 final DirectoryBasedDartSdk SHARED_SDK = DirectoryBasedDartSdk.defaultSdk;
 
 class AnalysisServerContextDirectoryManager extends ContextDirectoryManager {
   final AnalysisServer analysisServer;
 
   AnalysisServerContextDirectoryManager(this.analysisServer, ResourceProvider resourceProvider)
       : super(resourceProvider);
 
+  @override
   void addContext(Folder folder, File pubspecFile) {
     ContextDirectory contextDirectory = new ContextDirectory(
         analysisServer.defaultSdk, folder, pubspecFile);
     analysisServer.folderMap[folder] = contextDirectory;
     analysisServer.schedulePerformAnalysisOperation(contextDirectory.context);
   }
 
+  @override
   void applyChangesToContext(Folder contextFolder, ChangeSet changeSet) {
     analysisServer.folderMap[contextFolder].context.applyChanges(changeSet);
   }
+
+  @override
+  void removeContext(Folder folder) {
+    analysisServer.folderMap.remove(folder);
+  }
 }
 
 /**
  * Instances of the class [AnalysisServer] implement a server that listens on a
  * [CommunicationChannel] for analysis requests and process them.
  */
 class AnalysisServer {
   /**
    * The channel from which requests are received and to which responses should
    * be sent.
@@ skipping 418 matching lines @@
 /**
  * An enumeration of the services provided by the server domain.
  */
 class ServerService extends Enum2<ServerService> {
   static const ServerService STATUS = const ServerService('STATUS', 0);
 
   static const List<ServerService> VALUES = const [STATUS];
 
   const ServerService(String name, int ordinal) : super(name, ordinal);
 }