Improve logging performance

pkg/analyzer/lib/instrumentation/instrumentation.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 instrumentation;
 
 import 'dart:convert';
 
+import 'package:analyzer/task/model.dart';
+
 /**
  * A container with analysis performance constants.
  */
 class AnalysisPerformanceKind {
   static const String FULL = 'analysis_full';
   static const String INCREMENTAL = 'analysis_incremental';
 }
 
 /**
  * The interface used by client code to communicate with an instrumentation
@@ skipping 72 matching lines @@
    * non-`null` server (and hence instrumentation is active).
    */
   bool get isActive => _instrumentationServer != null;
 
   /**
    * The current time, expressed as a decimal encoded number of milliseconds.
    */
   String get _timestamp => new DateTime.now().millisecondsSinceEpoch.toString();
 
   /**
-   * Log that an analysis task is being performed in the given [context]. The
-   * task has the given [description].
+   * Log that the given analysis [task] is being performed in the given
+   * [context].
    */
-  void logAnalysisTask(String context, String description) {
+  void logAnalysisTask(String context, dynamic task) {
+    // TODO(brianwilkerson) When the old task model is removed, change the
+    // parameter type to AnalysisTask.
     if (_instrumentationServer != null) {
+      String description =
+          (task is AnalysisTask) ? task.description : task.toString();
       _instrumentationServer
           .log(_join([TAG_ANALYSIS_TASK, context, description]));
     }
   }
 
   /**
    * Log the fact that an error, described by the given [message], has occurred.
    */
   void logError(String message) {
     _log(TAG_ERROR, message);
@@ skipping 241 matching lines @@
     }
   }
 
   @override
   void shutdown() {
     for (InstrumentationServer server in _servers) {
       server.shutdown();
     }
   }
 }