Month: October 2019


October 28, 2019 By admin

5 METHODS I USE Hi there, its Molly here! First of all, THANK YOU for buying VidBiz. You’ve taken your FIRST STEP towards building an online business! Follow my methods here and you can start getting sales very soon to your new online business… Without much fluff, let me get started… Method #1 – How […]

CB Passive Income 5.0 Review: Is Patric Chan Course Legit?

October 27, 2019 By admin

What is CB Passive Income? What is CB Passive Income? Well, this is the reality that Patric Chan has actually set with his program CB Passive Income. It is a program that teaches you via training how to generate income online by constructing an e-mail list and also with affiliate marketing. I have actually heard […]

How To Build A Website – An All-In-One Guide

October 25, 2019 By admin

How to create a site is probably the first question that arises for every new webmaster. In the end, the framework used to build your site will determine the progress and growth of your online project. Therefore, it is important to draw up a clear plan and study each available option. How to create a website in 5 […]

HostGator Review 2020

October 23, 2019 By admin

HostGator endeavors to make web Hosting simple and reasonable, and in case you’re searching for a Plan that enables you to get a website fully operational rapidly and monetarily, look no further. Those making new Websites can use the included Website manufacturer, while those with existing Websites will get free Migration help. At the point […]

SiteGround Review

October 23, 2019 By admin

SiteGround is best known for its remarkable client service. Over that, they have quick, unshakable servers and moderate Plans with Features like free CDNs and SSL endorsements. We can’t locate a Host that beats them in general. In case you’re keen on going with SiteGround for your Website, ensure you click our connections since no […]

Topic messaging on Android- Push to every device or use topics?

October 22, 2019 By admin


We’ve got hundreds of thousands of users and we want push notifications to all their devices, to certain groups of people. We’ve got about 5000 classes. Each user in a class has notification preferences, they can choose or opt from a specific notification type. Let us say we have 20 telling types. We are to use SNS and Firebase to get this done. As far as I am aware, Firebase and SNS don’t possess message and doing it is.

What is a better option concerning rate and endurance, to push to every device individually or to create a topic per group, per notification kind?

How to deduplicate messages coming from having multiple instances of the same observer

October 22, 2019 By admin


I’ve got a web application that’s currently of several different services, 1 instance each.

My current objective is to scale some of my services to make sure fail over. 1 huge problem I foresee is that a service may execute the Exact Same job with all the instances, here is one example:

I’ve got one service which sends a mail composed of different data grabbed from the net. The email is programmed by the user, either persistent or one time. The planned email is then placed in database with the a datetime field saying when this ought to be done. My solutions are polling every x minutes to see if they have something to do, should they discover something to be done they mark the job as managed and goes on doing it. The problem I face is really between the time that the ceremony grabs the data from the database and the time the upgrade is effective other cases may have grabbed the”bogus” information and send another mail.

This may go the same way for another”observer” service that waits for incoming mails within a single inbox. From polling the inbox and deleting the email once handled, the exact identical race condition can create 2 or more instances handle the received mail.

This question have one part of my issue and the proposed solutions would be good for me. But this, it makes the assumption that there is only one”watcher”.

My other hypothesis is to have an elected master, or even any communication channel between different instances of an agency to get just one of them send the message to the job queue…

I would be delighted to learn how this type of topic is usually handled, astonishingly enough I could not find much info about that, or did not find the right search phrases to look for this.