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'use strict';
var _ = require('lodash');
module.exports = SubQueue;
function SubQueue() {
this.__queue__ = [];
}
/**
* Add a task to this queue
* @param {Function} task
*/
SubQueue.prototype.push = function( task, opt ) {
opt = opt || {};
// Don't register named task if they're already planned
if ( opt.once && _.find(this.__queue__, { name: opt.once }) ) {
return;
}
this.__queue__.push({ task: task, name: opt.once });
};
/**
* Return the first entry of this queue
* @return {Function} The first task
*/
SubQueue.prototype.shift = function() {
return this.__queue__.shift();
};
/**
* Run task
* @param {Function} skip Callback if no task is available
* @param {Function} done Callback once the task is completed
*/
SubQueue.prototype.run = function( skip, done ) {
if ( this.__queue__.length === 0 ) return skip();
setImmediate( this.shift().task.bind(null, done) );
};