round-robin-distributor/lib/distributor/round-robin.js

A brain dead module that would take array of urls and do a round robin distribution when calling donwstream

class RoundRobinDistributor{
    constructor(urlList){
        if(!Array.isArray(urlList)){
            throw 'URL List parameter should be an Array';
        }
        this.index = 0;
        this.urls = urlList;
        this.urlListTrueLength = this.urls.length - 1;
    }
    nextUrl(){
	if(this.urlListTrueLength == 0){
	    return this.urls[0];
	}
        else if(this.index > this.urlListTrueLength){
            this.index = 0;
        }
        return this.urls[this.index++];   
    }
}

module.exports = RoundRobinDistributor;