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| 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 library polymer.job; |
| 6 |
| 7 import 'dart:async' show Timer; |
| 8 |
| 9 /** |
| 10 * Invoke [callback] in [wait], unless the job is re-registered, |
| 11 * which resets the timer. For example: |
| 12 * |
| 13 * _myJob = runJob(_myJob, callback, const Duration(milliseconds: 100)); |
| 14 * |
| 15 * Returns a job handle which can be used to re-register a job. |
| 16 */ |
| 17 // Dart note: renamed to runJob to avoid conflict with instance member "job". |
| 18 Job runJob(Job job, void callback(), Duration wait) { |
| 19 if (job != null) { |
| 20 job.stop(); |
| 21 } else { |
| 22 job = new Job(); |
| 23 } |
| 24 job.go(callback, wait); |
| 25 return job; |
| 26 } |
| 27 |
| 28 // TODO(jmesserly): it isn't clear to me what is supposed to be public API here. |
| 29 // Or what name we should use. "Job" is awfully generic. |
| 30 // (The type itself is not exported in Polymer.) |
| 31 class Job { |
| 32 Function _callback; |
| 33 Timer _timer; |
| 34 |
| 35 void go(void callback(), Duration wait) { |
| 36 this._callback = callback; |
| 37 _timer = new Timer(wait, complete); |
| 38 } |
| 39 |
| 40 void stop() { |
| 41 if (_timer != null) { |
| 42 _timer.cancel(); |
| 43 _timer = null; |
| 44 } |
| 45 } |
| 46 |
| 47 void complete() { |
| 48 if (_timer != null) { |
| 49 stop(); |
| 50 _callback(); |
| 51 } |
| 52 } |
| 53 } |
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