Messaging Powered Front Ends

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This document discusses using messaging to power front-end applications. It covers using messaging for broadcasting notifications to all clients, sending targeted responses to single clients, adding fault tolerance through message persistence, and scaling concerns. The document provides examples using SignalR and RabbitMQ to demonstrate broadcasting notifications, targeted responses, handling faults when a handler is offline, and addressing scaling issues.

Software

Elton Stoneman
Microsoft MVP & Pluralsight Author
http://particular.net
Messaging Powered Front Ends

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
• Channel to the User
• Broadcast Notifications
• Targeted Responses
• Fault Tolerance
• Scaling Concerns
Outline

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Any back-end communication
Client callback mechanism
Mobile push / WebSockets / polling
Channel to the User
Broadcast
All clients
Pub-sub style
Targeted
Single client
Req-resp style

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Two-way comms over TCP/IP
Persistent connection (SPA)
SignalR adds fault-tolerance
WebSockets & SignalR
Server
.NET Hub
Can invoke client calls
Client
Connects to Hub
Can invoke server calls

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Demo: Broadcast Notifications
Noticeboard Web App WebSockets & Messaging

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Client-server call with SignalR
Web Server publishes to Exchange
Broadcast Notifications
exchange: noticeboard
SendMailRequest

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Exchange bound to Queues
Web Server listens on Queue
Broadcast Notifications
exchange: noticeboard
SendMailRequest
queue: broadcast
queue: persist

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Web server broadcasts to clients
Client renders new message
Broadcast Notifications

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Multiple Servers
Additional Queues
Broadcast Notifications

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Demo: Response Messages
Noticeboard Web App WebSockets & Messaging

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Multiple message handlers
Targeted Responses
exchange: noticeboard
SendMailRequest
queue: broadcast
queue: persist

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Dedicated reply queue
Specified in outgoing messages
Web Server listens for replies
Targeted Responses
exchange: noticeboard
SendMailRequest
queue: reply-svr01
Sender: elton
Content: hi
ReplyTo: reply-svr01

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Handlers act on message
Send reply with result
Targeted Responses
SendMailRequest
queue: persist
queue: reply-svr01
MailSavedEvent
HandlerFailedEvent

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Web server receives reply
Looks up client & sends
Targeted Responses

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
But... you can do this just with SignalR

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Persistence handler offline
Demo: Fault Tolerance
exchange: noticeboard
SendMailRequest
queue: broadcast
queue: persist X

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Durable queues
Messages wait for handler
Fault Tolerance
exchange: noticeboard
SendMailRequest
queue: persist

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Broadcast notification is easy
Targeted response – not so much...
Scaling Concerns

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
SignalR fault tolerance
Heartbeat checks connection
Scaling Concerns

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Connection re-established
Load-balanced Web servers
Scaling Concerns

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Messages to 'wrong' Reply Queue
Scaling Concerns
queue: reply-svr01 queue: reply-svr02

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Instead of per-server Reply Queue
Common Reply Exchange
Scaling Concerns

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
• You need a channel to the client
• Messaging semantics: pub-sub & req-resp
• Maintain patterns with messaging
• Fault tolerance – persistent messages
• Scaling – broadcast and filter
Summary

Thank you
blog.sixeyed.com
@EltonStoneman

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1. Elton Stoneman Microsoft MVP & Pluralsight Author http://particular.net Messaging Powered Front Ends

2. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends • Channel to the User • Broadcast Notifications • Targeted Responses • Fault Tolerance • Scaling Concerns Outline

3. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Any back-end communication Client callback mechanism Mobile push / WebSockets / polling Channel to the User Broadcast All clients Pub-sub style Targeted Single client Req-resp style

4. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Two-way comms over TCP/IP Persistent connection (SPA) SignalR adds fault-tolerance WebSockets & SignalR Server .NET Hub Can invoke client calls Client Connects to Hub Can invoke server calls

5. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Demo: Broadcast Notifications Noticeboard Web App WebSockets & Messaging

6. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Client-server call with SignalR Web Server publishes to Exchange Broadcast Notifications exchange: noticeboard SendMailRequest

7. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Exchange bound to Queues Web Server listens on Queue Broadcast Notifications exchange: noticeboard SendMailRequest queue: broadcast queue: persist

8. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Web server broadcasts to clients Client renders new message Broadcast Notifications

9. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Multiple Servers Additional Queues Broadcast Notifications

10. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Demo: Response Messages Noticeboard Web App WebSockets & Messaging

11. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Multiple message handlers Targeted Responses exchange: noticeboard SendMailRequest queue: broadcast queue: persist

12. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Dedicated reply queue Specified in outgoing messages Web Server listens for replies Targeted Responses exchange: noticeboard SendMailRequest queue: reply-svr01 Sender: elton Content: hi ReplyTo: reply-svr01

13. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Handlers act on message Send reply with result Targeted Responses SendMailRequest queue: persist queue: reply-svr01 MailSavedEvent HandlerFailedEvent

14. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Handlers act on message Send reply with result Targeted Responses queue: broadcast queue: reply-svr01 MailBroadcastEvent HandlerFailedEvent SendMailRequest

15. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Web server receives reply Looks up client & sends Targeted Responses

16. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends But... you can do this just with SignalR

17. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Persistence handler offline Demo: Fault Tolerance exchange: noticeboard SendMailRequest queue: broadcast queue: persist X

18. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Durable queues Messages wait for handler Fault Tolerance exchange: noticeboard SendMailRequest queue: persist

19. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Broadcast notification is easy Targeted response – not so much... Scaling Concerns

20. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends SignalR fault tolerance Heartbeat checks connection Scaling Concerns

21. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Connection re-established Load-balanced Web servers Scaling Concerns

22. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Messages to 'wrong' Reply Queue Scaling Concerns queue: reply-svr01 queue: reply-svr02

23. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends Instead of per-server Reply Queue Common Reply Exchange Scaling Concerns

24. Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends • You need a channel to the client • Messaging semantics: pub-sub & req-resp • Maintain patterns with messaging • Fault tolerance – persistent messages • Scaling – broadcast and filter Summary

25. Thank you blog.sixeyed.com @EltonStoneman

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