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Dustin Diaz's Publisher class to achieve a publisher-subscriber pattern in javascript

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  1. /*
  2. 	* Publisher Host (c) Creative Commons 2006
  3. 	* http://creativecommons.org/licenses/by-sa/2.5/
  4. 	* Author: Dustin Diaz | http://www.dustindiaz.com
  5. 	* Reference: http://www.dustindiaz.com/basement/publisher.html
  6. */
  7. /*
  8. 	* @Class: Publisher
  9. 		* Requires:
  10. 			* Array.prototype.forEach
  11. 			* Array.prototype.some
  12. 			* See Sugar Arrays at: 
  13. 			* http://www.dustindiaz.com/basement/sugar-arrays.html
  14. 	* Constructor: The almighty holder of its subscribers
  15. */
  16.  
  17. /* Minified */
  18. function Publisher(){this.subscribers=[];}Publisher.prototype.deliver=function(data,thisObj){var scope=thisObj||window;this.subscribers.forEach(function(el){el.call(scope,data);});};Function.prototype.subscribe=function(publisher){var that=this;var alreadyExists=publisher.subscribers.some(function(el){if(el===that){return;}});if(!alreadyExists){publisher.subscribers.push(this);}return this;};Function.prototype.unsubscribe=function(publisher){var that=this;publisher.subscribers=publisher.subscribers.filter(function(el){if(el!==that){return el;}});return this;};
  19.  
  20. /* Full */
  21. function Publisher() {
  22. 	this.subscribers = [];
  23. }
  24. /*
  25. 	* @desc: deliver | the delivery method
  26. 	* @param: data | The data you want to send to your subscribers
  27. 	* @param: thisObj | The scope you want to execute your callbacks
  28. */
  29. Publisher.prototype.deliver = function(data, thisObj) {
  30. 	var scope = thisObj || window;
  31. 	this.subscribers.forEach(
  32. 		function(el) {
  33. 			el.call(scope, data);
  34. 		}
  35. 	);
  36. };
  37. /*
  38. 	* @desc: subscribe | Gives all function objects 
  39. 	* the ability to subscribe to a Publisher Object
  40. 	* @param: publisher | The Publisher Object you wish to subscribe to
  41. */
  42. Function.prototype.subscribe = function(publisher) {
  43. 	var that = this;
  44. 	var alreadyExists = publisher.subscribers.some(
  45. 		function(el) {
  46. 			if ( el === that ) {
  47. 				return;
  48. 			}
  49. 		}
  50. 	);
  51. 	if ( !alreadyExists ) {
  52. 		publisher.subscribers.push(this);
  53. 	}
  54. 	return this;
  55. };
  56. /*
  57. 	* @desc: unsubscribe | Gives all function objects 
  58. 	* the ability to "unsubscribe" to a Publisher Object
  59. 	* @param: publisher | The Publisher Object you wish to unsubscribe to
  60. */
  61. Function.prototype.unsubscribe = function(publisher) {
  62. 	var that = this;
  63. 	publisher.subscribers = publisher.subscribers.filter(
  64. 		function(el) {
  65. 			if ( el !== that ) {
  66. 				return el;
  67. 			}
  68. 		}
  69. 	);
  70. 	return this;
  71. };

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