Server-Sent Event + Spring Boot | Part 2

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On this tutorial we will explore a solution to Send Events to Specific User using Spring Boot and Server Sent Events.
- Target a specific User
- Create an EventSource to Subscribe to Spring Boot Application endpoint
- Create Java Sseemitter, and handle completion, errors, and timeout
- Remove stored emitter when it's not reached anymore
- Dispatch Events to all clients
- Use Postman to send Rest Requests
IDE and tools used : Spring Tools (STS) IDE and Postman

[@experiencenano5352]

Superb explanation. Loved it. Thanks for keeping it simple for novice.

[@ricardojohannsen374]

congratulation! the best tutorial od SSE with Spring!! Make a tutorial in this style from WebSockets with Spring and how to scale it

[@javagrowth6221]

Yes Sir it's coming !

[@yavuzselimcetinkaya4475]

Great tutorial

[@deepikamahulia3530]

Hi JavaGrowth, thank you for this great tutorial. I have one scenario. Let’s say the user is subscribing to receive sse events and events will be sent based on some topics received from kafka broker. Now suppose, the user has subscribed to pod1 but some event is being listened on pod3. Now how will I determine that on which pod I need to send sse event?
Would be great if you could answer this.

[@PLanBBeaTZ]

A great and straight forward tutorial on Sse!! Thanks for uploading. Just one question, would it make sense to store the subscriptions in a database? When yes, what information would you store?

[@javagrowth6221]

Thanks for support bro. In my opinion the best options is to store subscriptions in redis

[@inheritcode1473]

You saved my day.

[@javagrowth6221]

Thanks for watching

[@shivakrishna5120]

Hi, JavaGrowth Thanks for the great tutorials. I think a small change is necessary for your code for emitters.remove(sseEmitter); this should be like emitters.remove(userID), and SSE has it's own limitations like we can open max 6 connections per host in a browser. it's better to discuss the pros and cons also so that newbies will choose the technologies based on their needs.
once again thanks for the information.

[@javagrowth6221]

Thanks for watching, i agree with you the subject is not as simple in big Applications and with many Users, some other components have to involve like RabbitMQ, and some Kafka. may be the subject of a future video.

[@rajivkumar-ub6uj]

Is it true? I mean it can handle only at max of 6 connections? Can you suggest the various other methods?

[@IvanRandomDude]

@@rajivkumar-ub6uj 6 connections per browser but it is HTTP1.1 limitation. Server Side Events are supposed to be streamed over HTTP2 anyway where that problem does not exists.

[@TrueEnroi]

Thank you.

[@Nightedz]

Thx a lot.

[@javagrowth6221]

Welcome on you Channel !

[@blessyjulie4989]

Hello sir! Thanks for the video ... Just one help, how to close the connection if the tab gets closed? the emitters list size is not reducing when closing the tab.

[@javagrowth6221]

Thanks for watching, on this use case you have to detect "Browser Closing",
window.onbeforeunload = function () {
/* Here you try to close SSE connection with server */
};

[@ajaysrivas6791]

shouldn't the emitters hashMap be static? Great tutorial btw!

[@javagrowth6221]

Yes maybe, but the tutorial is just to meet with SSE. on other big applications you have to store users and some RabbitMQ or Kafka stuffs.

[@izzykoding9114]

Nice tutorial... can I use this with HTML/JavaScript and PHP only? Client side using HTML/JavaScript and PHP for the server side. I want to use this for a web based application that require to send SSE to each user separately.

[@javagrowth6221]

Yes of corse, the advantage of using Spring in your backend is that it already have some great library to abstract some basic SSE features. Welcome.

[@nahlaaroua9509]

hi! thank you for your video but how can I send a message by spring boot and angular frontend for a specific user?

[@javagrowth6221]

Welcome on you Channel !

[@maxwbn27]

Thanks al lot for such a nice tutorial and great explanation. Can you share the source Code with us, so that we can have a look on it? :)

[@ramin2881]

Hi. Thanks for video. Does is support sending data to android/iOS apps?

[@javagrowth6221]

Thanks for your feedback ! i never did any development for Andriod apps only Webapp bro.

[@MishaMinion327]

Thanks! This was the easiest turorial to understand about this topic. I implemented this and it's working perfectly in my local, but I deployed it on Azure and there it takes too long to connect and it's always giving me a 504 error. Any idea of how could I find a solution for this?

[@javagrowth6221]

Thanks for your feedback !

[@akshayhande3759]

Great explanation. I implemented it but user specific code is not working for multiple browser. any suggestions?

[@javagrowth6221]

SSE is not compatible with evey browser, but a JS SSE prototype should exists.

[@Manu-in3zf]

Thanks for such a nice tutorial and great explanation.
this is what I was looking, for one of the use cases of my project.
also can you please share the code git link,?

[@javagrowth6221]

Thanks for watching !

[@Manu-in3zf]

@@javagrowth6221 I want to subscribe SSE after login, I am using Spring Security with Oatu2 jwt.
so while creating EventSource(url) in my js (Angular), did't find any option to pass Header.
can you please here, how sse will subscribe and send in a secure enviroment?

[@ssmarishettyable]

Wonderful... can you please add next one please?

[@javagrowth6221]

Welcome, some Websocket stuffs are coming !