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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 33 matching lines @@
   /**
    * Removes all elements in the queue.
    */
   void clear() {
     for (Queue<ServerOperation> queue in _queues) {
       queue.clear();
     }
   }
 
   /**
+   * Return the next operation to perform, or `null` if the queue is empty. This
+   * method does not change the queue.
+   */
+  ServerOperation peek() {
+    for (Queue<ServerOperation> queue in _queues) {
+      if (!queue.isEmpty) {
+        return queue.first;
+      }
+    }
+    return null;
+  }
+
+  /**
    * 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;
   }
 }