71 lines
1.7 KiB
JavaScript
71 lines
1.7 KiB
JavaScript
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/**
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* Used to run any asynchronous tasks sequentially (ajax mainly)
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* An asynchronous task must be created with:
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* - a run() function (required) that may call success() or error()
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* - a onSuccess() function (optional)
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* - a onError() function (optional)
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*/
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var asyncTaskRunner = (function() {
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var asyncTaskRunner = {};
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var asyncTaskQueue = [];
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var currentTask = undefined;
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var currentTaskStartTime = new Date().getTime();
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// Run the next task in the queue if any and no other is running
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asyncTaskRunner.runTask = function() {
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// If there is a task currently running
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if(currentTask !== undefined) {
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// If the current task takes too long
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if(currentTaskStartTime + 30000 < currentTime) {
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currentTask.error();
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}
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return;
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}
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// If no task in the queue
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if(asyncTaskQueue.length === 0) {
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return;
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}
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currentTask = asyncTaskQueue.shift();
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currentTaskStartTime = currentTime;
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showWorkingIndicator(true);
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// Set task attributes and functions
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currentTask.finished = false;
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currentTask.finish = function() {
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this.finished = true;
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showWorkingIndicator(false);
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currentTask = undefined;
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asyncTaskRunner.runTask();
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};
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currentTask.success = function() {
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if(this.finished === true) {
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return;
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}
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if(this.onSuccess) {
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this.onSuccess();
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}
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this.finish();
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};
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currentTask.error = function() {
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if(this.finished === true) {
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return;
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}
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if(this.onError) {
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this.onError();
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}
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this.finish();
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};
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currentTask.run();
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};
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// Add a task in the queue
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asyncTaskRunner.addTask = function(asyncTask) {
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asyncTaskQueue.push(asyncTask);
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};
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return asyncTaskRunner;
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})();
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