Build Clean Messaging in .NET with MassTransit

[@PhatBoyG]

Awesome video! So many details covered, including switching transports, the difference between IPublishEndpoint and IBus, ensuring contracts are in a namespace, and changing brokers - really amazing. Fantastic work, thanks for the great content!

[@nickchapsas]

Thank YOU for the great library Chris! So much more to cover in future videos.

[@wormB1]

@PhatBoyG hi Chris can you post docs of the configuration to use existing queues/topics that are created upfront by let’s say DevOps crew, regardless of the transport specific implementation (or ASB to be more precise)?

[@sp2502]

@@nickchapsas MultiBus would be good to cover.

[@GavSaysPogMoThoin]

@PhatBoyG @nickchapsas How about you both partner up for a series of videos covering MT and some of the more advanced concepts like Routing Slips and Sagas? Nick has a knack for making the complicated things simple, which I think the MT docs really need.

[@GuilhermeCardoso-td8qu]

You've alreays recommend to use Interfaces instead of classes to define the messas. Does the same applies with records, like Nick used here?

[@sunefred]

Yes please, a series on Sagas. Preferably with a mix of REST, database, and maybe other integrations.

[@Wfmike]

You are asking for a full on state machine course. Chris (MT author) has plenty of them in his channel.

[@bardin08]

@@Wfmike perfect! Thanks for the recommendation!

[@michaelnjensen]

@@Wfmike What is his channel?

[@vitovondervollbart1620]

Would love to see @nickchapsas's take on these topics. Sagas, yes please! Activities and routing slips, yes please! Outbox pattern, yes please! BTW, very thorough playlists here from Chris Patterson aka @PhatBoyG right here 👉 www.youtube.com/@PhatBoyG/playlists

[@Wfmike]

@@michaelnjensen www.youtube.com/@phatboyg

[@pablocom]

I would LOVE to see more videos about Masstransit ❤

[@tonystoynev7969]

Hey, @Nick! It will be great if you make a video explaining the concept of Sagas! There aren’t many out there and I believe yours will be the best

[@devmarkmonster]

Wow, nice work! I’ve been using MassTransit for about 5 years now and would not have thought anyone could cover so much of MassTransit in such a condensed form.

[@ivandrofly]

11:59 - Very good point :) (no leaking domain model) 13:49 - Referring to the Outbox or Transactional Outbox Pattern 14:23 - Consumer project

[@nickpolyderopoulos3491]

I wanted a video like that Nick. I am using MassTransit for the last couple of years at work and I wanted an easy way to explain it to the new developers. Now your video will help with that :)

[@lyndseypaxton3697]

Great video, as usual. Would indeed love to see more details around sagas

[@reniersantanderyhanes6750]

Thanks!

[@rholdorf]

Yes, please do some Saga state machine content. It would be nice to have your take on that. Chris’ videos are good but I think the community will love to see you explaining things.

[@DoronGrinzaig]

The "well documented" in the intro. Man... You gotta be kidding me! Just stumbled on this video after spending a couple of hours of reading the source code because I could not find anything useful in the docs. It's a very useful library for sure and hats off to its creator and maintainers, but it has a lot of work to do on the documentation side.

[@jrqv]

Excellent video Nick! And yes please make videos about those more advanced concepts, resilience best practices especially

[@inzyster]

I’ve been using MassTransit for a bit over 2 years now and seeing how awesome this video was I would love to see you talk about Sagas.

[@user-sq7ry5vx7t]

I was searching for exactly this video like a month ago, it would have saved me many hours of love cast and documentation dive around some core concepts. But the documentation is so nicely written that it would be a shame to not have read it. Alas, this is awesome and I hope more content is produced around MassTransit (beside Chris Patterson own content, which is awesome but if the only person talking about a library is its own creator people may be more cautious to adopt).

[@MatijaHorvat-z4r]

This guy rocks! Thank you for the great video. Loads of details, so clearly explained.

[@phennexion]

Not sure if it was intentional but you explained things well enough for dummies like me to understand the basics this time around and I appreciate that!! lol

[@mediaatul]

Hi @Nick, i've been following you for long time, and learned lot from your videos, it helps me lot in enhancing my skills and career, do you mind creating one video series in Distributed transaction in Microservices.

[@nickchapsas]

Great topic! I'll add it in the list

[@mediaatul]

@@nickchapsas Thanks Nick 😊

[@robertkhou]

Many years ago I used MassTransit but I have since replaced it with Dapr, Dapr is great!

[@claudiovalerio7253]

Great video as usual! Other videos about sagas and other messaging concepts will be extremely appreciated!

[@eagleinthesky9777]

Thank you for the great video! MassTransit is definitely great library and we used it on some small projects, but unfortunately it did not support configuration to work without admin permissions so we could not use it for big project that required infrastructure as a code approach. It always required connection string with admin permissions and wanted to modify infrastructure, create queues, read all available queues, etc... We needed something that just works with send and receive permissions and nothing more. Maybe it is possible now, but it was not possible in previous versions.

[@SlackwareNVM]

Resilience has been a hot topic at our workplace. I'd love to see more videos on that.

[@jameshancock]

Sagas and Resilience, yes please!

[@pilotboba]

@Nick Lots of stuff to parse in here. A few questions. What what you showed the same if there is a single consumer or multiple consumers? If multiple, which consumer is responsible for removing the message from the queue? Also, is it a common best practice to have a single queue for message type? At our shop, it seems more common to have one queue and multiple message types go through the queue. Also, I'd love to see some explanation of when to use SNS vs SQS and when and why to use them together.

[@leonardomoreno23]

Saga is always a hot topic. Can't wait to watch it

[@YiannisMiliaresis]

Μπράβο Nick, thank you for this video !

[@atomicazure]

Thank you Nick. I learnt Masstransit from you.

[@dudelkt]

Awesome video as always!!! I've been using MassTransit for the last couple of years and it's have been a great experience overall. I would like to learn more about Sagas too :)

[@coolmn786]

Love your timing. Thinking of using queues for a side project and doom! Video about it. Please do continue this series

[@bardin08]

Awesome into to MassTransit, but we need a second (advanced) part where Sags and other advanced features of MassTransit

[@GiovanniOrlandoi7]

Thanks for the video! Would like to learn more about Sagas and Masstransit

[@BloodXlll]

That would be great to learn more about the sagas!

[@kirillhorn3186]

Yeah, definitely want a video about sagas and ither stuff!

[@vasiliyfofanov2605]

Thanks a lot for the video. Waiting for Sagas video

[@nove1398]

Yes looking out for a video on sagas

[@robertlofthouse9667]

Awesome video as always Nick. A MassTransit series that covers sagas and resilience would be great, thanks very much

[@steve-wright-uk]

Great video. Would love to see more about sagas, and also about publishing a single message that get consumed by many consumers.

[@denizcanaltun]

Awesome! Thanks Nick

[@Chorniyko]

Saga related video would be highly appreciated 😀

[@orthodox-4-ever]

We want Sagas! 🥳

[@SamFerree]

thoughts on Rebus? I have nothing but the highest praise for it.

[@bbatchelder]

Yes to Sagas and Resilience!

[@michaelnjensen]

Definitely interested in more on masstransit, with sagas, statemachines, handling transactions etc, would even buy a course on it, along with many other more in-depth topics used for more complex enterprise/microservice solutions.

[@dcernach]

Great content as usual! Brig us a video about Sagas using Masstransit and RabbitMq!

[@luludahora]

Awesome content, Nick! A sagas video would be nice. Also, what do you think about showing us how to add a unit of work with mass transit? Thanks

[@queenstownswords]

Nick, great Video. Please give insights on how you would test this (unit and integration). Thanks!

[@MXDMND_]

Hey Nick, I am intrested in the Saga video as well. Thank you 😊

[@kir2154]

It would be perfect to know sagas concepts!

[@FlippieCoetser]

Yes, please do a video on Saga and while you are at it throw Azure Pub-Sub in the mix.

[@rcamine]

a series about contract testing would be cool

[@go4fazal]

you keep on saying : link in the description for the course at 14:07 ?? can you please help me here with that link for the course?

[@yhabshaker9143]

Thank you. How can we ensure that both the data saving and message sending processes were completed successfully?

[@torrvic1156]

Hello Nick! :) Great lesson indeed. Really want to see your video on SAGAS. But please slow down a bit. You are super fast and I am a bit slow 😂

[@tahat4tt631]

Hi nick, Can you please explain more about sages and activities? 15:37

[@Andy01010]

Yes please, make more videos 😎

[@alexisfibonacci]

Yes please! Sagas!

[@rezaabolhasanzadeh6845]

Tnx Nick Please create a complete tutorial on implementing saga pattern using masstransit

[@sonics5439]

Hi Nick, what is your recommendation on how to address problem when DB operation succeeds but publish message operation times out or fails in general? The only option I see is to use DB transaction which would be committed after publish operation succeeds but would like to know your opinion. Thanks!

[@zholinho]

I am using database as a queue. So when I do SaveChanges() everything or nothing will be saved.

[@travusb]

I've been looking at MassTransit for a while for a rewrite of our code base and would love to see a series on it.

[@childeroftheatom]

I love masstransit but I prefer to use Bustr because it is an abstraction on top of it to make it simpler to scale and more organized

[@yoanashih761]

Will the sqs be created automatically if we run publisher first?

[@davidpiepgrass743]

The RabbitMQ example suggests that the answer is no (and I don't know why).

[@paulkeating9259]

Would love to hear your take on Sagas be it on here or dometrain

[@eshadow2980]

Awesome video, thank you! Can you make video for more advance feature like consuming messages in multiple instances using round-robin and how handle in case of one instance failed to process the message after consuming (retries, redelivery to next instance) ?

[@lutfidwedari]

Thanks, Very Interesting, I just missed com comparison with other libraries that implement the AMQP protocol and with what queue transports it can use, I only see AmazonSQS, RabitMq and InMemory. Finally how does it handle disconnects?

[@nickchapsas]

There is built in resiliance which I will be showcasing in a future video. MassTransit officially supports RabbitMQ, Azure Service Bus, Amazon SQS, ActiveMQ, Kafka, In Memory and gRPC

[@pavelyeremenko4640]

@@nickchapsas This is misleading. Afaik, it supports most of these as "Riders", not as primary brokers/transport. So if you wanted to completely switch from rabbit to kafka, you would probably need to drop masstransit in the process.

[@PhatBoyG]

@@pavelyeremenko4640 Only Kafka and Azure Event Hub are riders (they are both streams, not queues), and they can be used with or without a broker for the bus. So you don't need to drop anything to use MassTransit with either of these event stream providers.

[@pavelyeremenko4640]

@@PhatBoyG Would you mind sharing code examples of using MassTransit on top of kafka?

[@yapadubpadoo]

Thanks for sharing

[@aymaneeljahrani2280]

What if you want to share the contracts over multiple projects ? Would maintain it as a git repo and keep it in sync over these projects ? If not what would have you done ?

[@RMarjanovic]

Hey Nick and thanks for a great video. When testing out MassTransit in my own projects I'm faced with the issue that topics / endpoints get created based on the namespace name. Which means that the consumer and publisher needs to share the same namespace on the message being sent. If I don't want to create a separate class library for the messages, nor sharing the same namespace name between different projects, is there a way to configure this more granularly in the setup?

[@BTimelessC]

Yes there is, you can configure your own topic/queue names. For example in azure service bus you can do it like : cfg.Message(m => m.SetEntityName("topic-name"));

[@Divus90]

As mentioned by BTimelessC, you can set both queue and subscription names (not sure how to handle that with topic) on your own.

[@eagleinthesky9777]

There are replies in this thread how to configure custom topic name, you can try to set subscription name as well but unfortunately it will not work if classes are in different namespaces. It looks like strict requirement of the library that namespace and class name should match. If they don't match - MassTransit will try to create queue with "_skip" suffix and will send your messages there. If you will not give it permissions to create new queues - it will just fail.

[@amirhossein6674]

Fantastic video.

[@adriaarquimbaucodina7398]

Nice video. What about idempotency when using a consumer that Scale-out to keep the idempotency in duplicates for example.

[@june3878]

Does MassTransit allow real-time control of the banding?

[@logantcooper6]

MassTransit has a transactional outbox as well.

[@julienlefevre1661]

Thanks for this video. What about performances of MassTransit compared to dedicated ones? :)

Can anyone please explain why and how is Yield used in the BackgroundService?

[@nickchapsas]

That little gem deserves a video of its own

[@pavelromashuk237]

Hi Nick. Thank you for the video. I am not so familiar with AWS, but with Azure. In Azure service bus there is an option to create a filters on the topic by subscription. May you know if masstransit supports it? It would be cool if you could make a video about it. Thank you.

[@christpetitjean]

Hello Nick, did you already looked at Dapr ? If so, what are your thoughts?

[@JosephRuhundwa]

Super Cooooooool. Thank you very much for the video. Keep up the good work.

[@Mec2005]

@Nick, is it possible to use LiteDB with MassTransit?

[@cordsac8107]

Please do some complete tutorial for handling notification service with MassTransit + Hangfire or Quartz.

[@recaicingoz6785]

Hello Nick, I need to ask you an question . If I use that this type to message among our service in windows 10 operation system that Won't I need any docker images etc...

[@Michdree]

Hey Nick, great video thank you :) what still would be interesting to me is, how can we replace IMediatR with Masstransit Mediator and hook into the request pipeline to still be able to validate requests, messages etc before they reach the handler/consumer? or for doing audit, logging stuff

[@SelyChangampally]

What is the benefit of this over grpc or websocket?

[@FilipFranik]

Just now I'm trying (and failing) to setup some end-to-end tests with MassTransit and WebApplicationFactory!

[@farzadmf]

SUPER cool!

[@martinmikhail]

Nick, you are amazing and everyone thinks I'm a genius because I watch your videos. I have an app that writes to a DB however, the DB it taken down a number of times a month for maintenance. I was thinking of adding an internal que for resilience. Is that the correct answer?

[@woistdasniveau8290]

Is messaging now considered a good practice or not i am confused on this topic.

[@codesafariDev]

Hey Nick, great video - as always! I could not find a video about Hot Chocolate in your history, did you ever give it a try?

[@ilanb]

Love MassTransit! We use it extensively with RabbitMQ at work.

[@NicholasVardy-d7i]

Is it possible to set this up using IFunctionsHostBuilder in an Azure function app? I don't get any compile time errors, but when I run it it breaks on the 'AddMassTransit' section with an error saying 'Method SerializeObject in type MassTransit.Serialization.SystemTextJsonMessageSerializer does not have an implementation'.

[@alessandrorodiani6651]

More on MassTransit and sagass

[@RudiOnRails]

So am a missing something, what is the difference between MT and Mediatr?

[@camerascanfly]

While MediatR is the solution for de-coupling in-process, MassTransit is the solution to loosely or tight coupling (pub/sub vs request/response) multiple services. MassTransit can also be used in-process of course while MediatR has no concept of messaging, pub/sub or even request/response. It is just a lightweight solution for slicing software vertically without introducing and/or managing the hassles of microservices… though of course you can mix both techniques…

[@superpcstation]

Hey nick, can you talk about Task.Yield?

[@tbgelectr0]

How do I get that git(!?) icons in terminal?

[@thomasgunther8249]

Hi Nick great video as always! I just started looking into MassTransit. I have two separate apps (no IPC) that are supposed to exchange simple messages with each other. The whole thing must work offline (so no AWS & Co.). RabbitMQ is a bit overkill. I thought of the GrpcProvider, which is also available for MassTransit. Do you think that could work? 🙂🤟👍

[@aliengarden]

I'm having the same question. What did you end up using?

[@minhgiangho1410]

Assuming we have RabbitMQ transit, one consumer uses MassTransit, one publisher does not use MT, or reverse, how can they communicate with each other?

[@BTimelessC]

Definitely want a video on sagas :P Amazing videos as always. Could mass transit add different messaging implementations (RabbitMq, Azure Service Bus, AWS) for different consumers I wonder? I think it might, something about that ConfigureEndpoints method

[@lebgdu31081996]

Just perfect, keep teaching us more please !

[@OsoreWatashi]

Wondering about Wolverine here. It can interop with MassTransit if needed, but would you for new applications?

[@adrian_franczak]

Is using queue per message Type good?

[@nickchapsas]

It depends on what you’re trying to do. For example SQS by default isn’t FIFO so it doesn’t matter.

[@mihaimyh]

Does Masstransit has behaviors, like MediatR?

[@Wfmike]

They are called middleware in MT. You can implement the same logging/exception handling/validation behavior in a traditional vertical slice architecture but distributed.

[@GavSaysPogMoThoin]

Another request for routing slips / sagas.

[@maksymkyian4920]

Please make a video about Sagas =)