ActionScript 3 Cronjob [beta]

I wrote a cronjob class in actionscript 3 during my flight back to Lima from San Francisco. This could help you manage repetitive or single tasks in the future using a cron task syntax.

Here is the cronjob main class:

  1. package utils {
  3. import flash.events.EventDispatcher;
  4. import flash.events.TimerEvent;
  5. import flash.utils.Timer;
  7. import events.CronEvent;
  9. public class Cron extends EventDispatcher {
  11. private var $__timer:Timer = new Timer(60000);
  12. private var $__running:Boolean = false;
  13. private var $__tasks:Array = new Array();
  14. private var $__tasksId:Object = new Object();
  16. public function Cron(){
  17. $__timer.addEventListener(TimerEvent.TIMER, checkTask);
  18. }
  20. public function start():void{
  21. if(!$__running){
  22. var secRes:uint = (60 - ((new Date()).getSeconds() + 1)) * 1000;
  23. var delay:Timer = new Timer(secRes, 1);
  24. delay.addEventListener(TimerEvent.TIMER, function(event:TimerEvent):void{
  25. checkTask((event.clone() as TimerEvent));
  26. $__timer.start();
  27. });
  28. delay.start();
  29. $__running = true;
  30. }
  31. }
  33. public function stop():void{
  34. $__running = false;
  35. $__timer.stop();
  36. }
  38. public function addTask(task:String):void{
  39. task = trim(task);
  40. validateTask(task);
  41. $__tasksId[task.split(" ").pop()] = $__tasks.push(task);
  42. }
  44. public function removeTask(id:String):void{
  45. if($__tasksId[id] == null) throw new Error("Task id " + id + " not found");
  46. $__tasks[$__tasksId[id]] = null;
  47. $__tasksId[id] = null;
  48. delete $__tasksId[id];
  49. }
  51. public function get running():Boolean{
  52. return $__running;
  53. }
  55. private function trim(str:String):String{
  56. return str.replace(/^\s+|\s+$/g, '');
  57. }
  59. private function validateTask(str:String):void{
  60. if(str.split(" ").length != 6) throw new Error("Task format error");
  61. if($__tasks[str.split(" ").pop()] != null) throw new Error("Task id already exists");
  62. }
  64. private function toObject(list:Array):Object{
  65. var res:Object = new Object();
  66. for(var i:uint=0;i<list.length;i++){
  67. if(list[i] != "") res[list[i]] = true;
  68. }
  69. return res;
  70. }
  72. private function $__transform(item:String):*{
  73. if(item.indexOf(",") != -1 && item.indexOf("/") == -1){
  74. return toObject(item.split(","));
  75. }else if(item.indexOf("/") != -1 && item.indexOf(",") == -1){
  76. var items:Array = new Array("0");
  77. for(var i:uint=0;i<(60 - uint(item.split("/")[1]));){
  78. i += uint(item.split("/")[1]);
  79. items.push(i);
  80. }
  81. return toObject(items);
  82. }else{
  83. return item;
  84. }
  85. }
  87. private function $__check(item:*, index:int, array:Array):void{
  88. var date:Date = new Date();
  89. var pieces:Array = item.split(" ");
  90. var mins:* = $__transform(pieces.shift());
  91. var hours:* = $__transform(pieces.shift());
  92. var days:* = $__transform(pieces.shift());
  93. var months:* = $__transform(pieces.shift());
  94. var weekDay:* = $__transform(pieces.shift());
  95. var id:String = pieces.shift();
  96. var dispatch:Boolean = (mins is String) ? (date.getMinutes().toString() == mins || mins == "*"): ((date.getMinutes() + 1).toString() in mins);
  97. dispatch = dispatch && ((hours is String) ? (date.getHours().toString() == hours || hours == "*"): ((date.getHours() + 1).toString() in hours));
  98. dispatch = dispatch && ((days is String) ? (date.getDate().toString() == days || days == "*"): ((date.getDate() + 1).toString() in days));
  99. dispatch = dispatch && ((months is String) ? ((date.getMonth() + 1).toString() == months || months == "*"): ((date.getMonth() + 2).toString() in months));
  100. dispatch = dispatch && ((weekDay is String) ? (date.getDay().toString() == weekDay || weekDay == "*"): ((date.getDay() + 1).toString() in weekDay));
  102. dispatchEvent(new CronEvent(CronEvent.TASK, id));
  103. }
  105. private function checkTask(event:TimerEvent):void{
  106. $__tasks.forEach($__check);
  107. }
  109. }
  111. }

And here is the CronEvent class:

  1. package events {
  3. import flash.events.Event;
  5. public class CronEvent extends Event {
  7. public static const TASK:String = "task";
  8. public var id:String = "";
  10. public function CronEvent(type:String, id:String=""){
  11. this.id = id;
  12. super(type);
  13. }
  15. override public function clone():Event{
  16. return new CronEvent(type, id);
  17. }
  19. }
  21. }

Here is how you can use it:

  1. import utils.Cron;
  2. import events.CronEvent;
  4. var c:Cron = new Cron();
  5. c.addEventListener(CronEvent.TASK, taskHandler);
  6. function taskHandler(event:CronEvent):void{
  7. trace ("The task id is: " + event.id);
  8. }
  9. c.addTask("* * * * * mainID"); // repetitive task (every minute)
  10. c.addTask("0 0 * * * otherID"); // repetitive task every day at 00:00
  11. c.start();

I haven’t had the chance to test it carefully. Please let me know if you find anything.

—fernando


Posted on July 6, 2008 10:45 PM
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