Deferred Callback Queue

Simple method to defer and throttle the execution of method calls.

Properties

• queue
  • contains an array of call hashes
• interval
  • the interval id

Methods

• start()
  • starts the interval with the work function as callback
• work()
  • loops over the queue array
  • it will execute the callbacks that are due
  • it will remove the callbacks after execution
• removeCall(callback)
  • removes a callback if present in the queue
• hasCall(callback);
  • check if a call is queued
  • returns true/false
• addCall(callback, delay):
  • adds a callback to the queue
  • if the callback is already queue, it simply defers it further by calling updateCall(callback, delay)
  • delay must be an int and represents the number of miliseconds from now untill the execution
• getCall(callback)
  • returns undefined if not in queue or a hash with the following keys: func, delay, addedAt and when
• updateCall(callback, delay)
  • delay must be an int and represents the number of miliseconds from now untill the execution

Usage

// include the <script>
/**
 * Initialize the queue, with an interval of 100 miliseconds and autostart set to true.
 * If autostart is false or not specified, you must call queue.start(); yourself.
 */
var queue = new DeferredCallbackQueue(100, true);
 
$('.something').click(function () {
    /**
     * Clicking this function will queue the Do.Something method to be executed
     * at least 1024 miliseconds after the click.
     * If in this interval, you click the function again, it will only defer the
     * execution a bit more but not queue it again.
     * This is usefull for example when you want to save the data from a form in
     * the server side session.
     * NB: This won't work with anonymous functions, as they will always appear
     * to be unique functions
     */
    queue.addCall(Do.Something, 1024);
});

Credits

• The TriSoft Team