Rework Timer interface.

samples/chat/chat_server_lib.dart

 // Copyright (c) 2012, 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 chat_server;
 import 'dart:async';
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:json' as json;
 import 'dart:math';
@@ skipping 516 matching lines @@
   }
 
   void init() {
     _logRequests = false;
     _topic = new Topic();
     _serverStart = new DateTime.now();
     _messageCount = 0;
     _messageRate = new Rate();
 
     // Start a timer for cleanup events.
-    _cleanupTimer =
-        new Timer.repeating(10000, (timer) => _topic._handleTimer(timer));
+    _cleanupTimer = new Timer.repeating(const Duration(seconds: 10),
+                                        _topic._handleTimer);
   }
 
   // Start timer for periodic logging.
   void _handleLogging(Timer timer) {
     if (_logging) {
       print("${_messageRate.rate} messages/s "
             "(total $_messageCount messages)");
     }
   }
 
@@ skipping 35 matching lines @@
           (request) => request.path == "/join", _joinHandler);
       _server.addRequestHandler(
           (request) => request.path == "/leave", _leaveHandler);
       _server.addRequestHandler(
           (request) => request.path == "/message", _messageHandler);
       _server.addRequestHandler(
           (request) => request.path == "/receive", _receiveHandler);
       try {
         _server.listen(_host, _port, backlog: message.backlog);
         replyTo.send(new ChatServerStatus.started(_server.port), null);
-        _loggingTimer = new Timer.repeating(1000, _handleLogging);
+        _loggingTimer =
+            new Timer.repeating(const Duration(seconds: 1), _handleLogging);
       } catch (e) {
         replyTo.send(new ChatServerStatus.error2(e.toString()), null);
       }
     } else if (message.isStop) {
       replyTo.send(new ChatServerStatus.stopping(), null);
       stop();
       replyTo.send(new ChatServerStatus.stopped(), null);
     }
   }
 
@@ skipping 80 matching lines @@
     }
   }
 
   int _timeRange;
   List<int> _buckets;
   int _currentBucket;
   int _currentBucketTime;
   num _bucketTimeRange;
   int _sum;
 }