Messaging Powered Front Ends

Elton StonemanMicrosoft MVP & Pluralsight Author

http://particular.net

Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends

•Channel to the User

•Broadcast Notifications

•Targeted Responses

•Fault Tolerance

•Scaling Concerns

Outline

Any back-end communicationClient callback mechanism Mobile push / WebSockets / polling

Channel to the User

BroadcastAll clientsPub-sub style

TargetedSingle clientReq-resp style

Two-way comms over TCP/IPPersistent connection (SPA)SignalR adds fault-tolerance

WebSockets & SignalR

Server.NET HubCan invoke client calls

ClientConnects to HubCan invoke server calls

Demo: Broadcast Notifications

Noticeboard Web App WebSockets & Messaging

Client-server call with SignalRWeb Server publishes to Exchange

Broadcast Notifications

exchange: noticeboard

SendMailRequest

Exchange bound to QueuesWeb Server listens on Queue

SendMailRequestqueue: broadcast

queue: persist

Web server broadcasts to clientsClient renders new message

Multiple ServersAdditional Queues

Demo: Response Messages

Noticeboard Web App WebSockets & Messaging

Multiple message handlers

Targeted Responses

SendMailRequest

queue: broadcast

queue: persist

Dedicated reply queueSpecified in outgoing messagesWeb Server listens for replies

Targeted Responses

SendMailRequest

queue: reply-svr01

Sender: eltonContent: hiReplyTo: reply-svr01

Handlers act on messageSend reply with result

Targeted Responses

SendMailRequest

queue: persist

queue: reply-svr01

MailSavedEvent

HandlerFailedEvent

Handlers act on messageSend reply with result

Targeted Responses

queue: broadcast

queue: reply-svr01

MailBroadcastEvent

HandlerFailedEvent

SendMailRequest

Web server receives replyLooks up client & sends

Targeted Responses

But... you can do this just with SignalR

Persistence handler offline

Demo: Fault Tolerance

SendMailRequest

queue: broadcast

queue: persist X

Durable queuesMessages wait for handler

Fault Tolerance

SendMailRequest

queue: persist

Broadcast notification is easyTargeted response – not so much...

Scaling Concerns

SignalR fault toleranceHeartbeat checks connection

Scaling Concerns

Connection re-establishedLoad-balanced Web servers

Scaling Concerns

Messages to 'wrong' Reply Queue

Scaling Concerns

queue: reply-svr01 queue: reply-svr02

Instead of per-server Reply QueueCommon Reply Exchange

Scaling Concerns

•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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