GetBulkRelatedVideoInformation.js

getBulkRelatedVideoInformation: function(videoIds, callback) {
    //  TODO: Maybe abort if takes too long or debug this really well.
    var bulkRelatedVideoInformation = [];
    var totalVideosToProcess = videoIds.length;
    var videosProcessed = 0;
    var videosToProcessConcurrently = 5;
    var videosProcessing = 0;

    var self = this;
    var youtubeQueryInterval = setInterval(function () {

        if (videosProcessed == totalVideosToProcess) {
            clearInterval(youtubeQueryInterval);

            callback(bulkRelatedVideoInformation);
        }
        else {
            
            //  Don't flood the network -- process a few at a time.
            if (videosProcessing <= videosToProcessConcurrently) {
                videosProcessing++;

                var currentVideoId = videoIds.pop();

                //  Use a closure to ensure that I iterate over the proper videoId for each async call.
                var getRelatedVideoInfoClosure = function (closureCurrentVideoId) {

                    self.getRelatedVideoInformation(closureCurrentVideoId, function (relatedVideoInformation) {

                        //  getRelatedVideoInformation might error out.
                        if (relatedVideoInformation) {

                            bulkRelatedVideoInformation.push({
                                videoId: closureCurrentVideoId,
                                relatedVideoInformation: relatedVideoInformation
                            });
                        }

                        videosProcessed++;
                        videosProcessing--;
                    });

                };

                getRelatedVideoInfoClosure(currentVideoId);

            }

        }


    }, 200);

},