messaging powered front ends
TRANSCRIPT
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Elton StonemanMicrosoft MVP & Pluralsight Author
http://particular.net
Messaging Powered Front Ends
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
•Channel to the User
•Broadcast Notifications
•Targeted Responses
•Fault Tolerance
•Scaling Concerns
Outline
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Any back-end communicationClient callback mechanism Mobile push / WebSockets / polling
Channel to the User
BroadcastAll clientsPub-sub style
TargetedSingle clientReq-resp style
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
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
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Demo: Broadcast Notifications
Noticeboard Web App WebSockets & Messaging
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Client-server call with SignalRWeb Server publishes to Exchange
Broadcast Notifications
exchange: noticeboard
SendMailRequest
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Exchange bound to QueuesWeb Server listens on Queue
Broadcast Notifications
exchange: noticeboard
SendMailRequestqueue: broadcast
queue: persist
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Web server broadcasts to clientsClient renders new message
Broadcast Notifications
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Multiple ServersAdditional Queues
Broadcast Notifications
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Demo: Response Messages
Noticeboard Web App WebSockets & Messaging
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Multiple message handlers
Targeted Responses
exchange: noticeboard
SendMailRequest
queue: broadcast
queue: persist
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Dedicated reply queueSpecified in outgoing messagesWeb Server listens for replies
Targeted Responses
exchange: noticeboard
SendMailRequest
queue: reply-svr01
Sender: eltonContent: hiReplyTo: reply-svr01
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Handlers act on messageSend reply with result
Targeted Responses
SendMailRequest
queue: persist
queue: reply-svr01
MailSavedEvent
HandlerFailedEvent
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Handlers act on messageSend reply with result
Targeted Responses
queue: broadcast
queue: reply-svr01
MailBroadcastEvent
HandlerFailedEvent
SendMailRequest
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Web server receives replyLooks up client & sends
Targeted Responses
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
But... you can do this just with SignalR
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Persistence handler offline
Demo: Fault Tolerance
exchange: noticeboard
SendMailRequest
queue: broadcast
queue: persist X
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Durable queuesMessages wait for handler
Fault Tolerance
exchange: noticeboard
SendMailRequest
queue: persist
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Broadcast notification is easyTargeted response – not so much...
Scaling Concerns
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
SignalR fault toleranceHeartbeat checks connection
Scaling Concerns
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Connection re-establishedLoad-balanced Web servers
Scaling Concerns
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Messages to 'wrong' Reply Queue
Scaling Concerns
queue: reply-svr01 queue: reply-svr02
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Introduction to ServiceInsight for NServiceBusMessaging Powered Front Ends
Instead of per-server Reply QueueCommon Reply Exchange
Scaling Concerns
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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
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Thank you
blog.sixeyed.com
@EltonStoneman