Prioritize analysis operations for contexts with priority files.

pkg/analysis_server/lib/src/operation/operation_queue.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 operation.queue;
 
 import 'dart:collection';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/operation/operation.dart';
@@ skipping 46 matching lines @@
   ServerOperation peek() {
     for (Queue<ServerOperation> queue in _queues) {
       if (!queue.isEmpty) {
         return queue.first;
       }
     }
     return null;
   }
 
   /**
+   * Reschedules queued operations according their current priorities.
+   */
+  void reschedule() {
+    // prepare all operations
+    List<ServerOperation> operations = <ServerOperation>[];
+    for (Queue<ServerOperation> queue in _queues) {
+      operations.addAll(queue);
+      queue.clear();
+    }
+    // add all operations
+    operations.forEach(add);
+  }
+
+  /**
    * Returns the next operation to perform or `null` if empty.
    */
   ServerOperation take() {
     for (Queue<ServerOperation> queue in _queues) {
       if (!queue.isEmpty) {
         return queue.removeFirst();
       }
     }
     return null;
   }
 }