Get On The Bus Chris Klug – Code Ninja [email protected] | @ZeroKoll

Get On The Bus

Chris Klug – Code [email protected] | @ZeroKoll

http://chris.59north.com/

Who am I?

Assumptions

What is the Windows Azure Service

Bus?2 features and a kicker

Relayed Messaging 101

Client Service

Service Bus

DemoCreating a relayed service

Discovery...built into the Service Bus...

DemoMaking a service discoverable

Loadbalancing Relayed Calls

...just add a second service...or third...or...

DemoLoadbalancing a relayed service

HTTP API...everyone’s favorite API...

DemoMaking the IsItFriday HTTP-based

Brokered Messaging 101

Client Service

Service BusQueues & Topics

2 Main FeaturesQueues | Topics & Subscriptions

Service Bus Queues

• 256kb Payload limit• 1-5Gb storage limit• Long-polling in client• Two retrieval models– PeekLock, ReceiveAndDelete

• Supports deadlettering

Queues – Message Retrieval

• ReceiveAndDelete– Retrieves and Deletes message in one

• PeekLock– Retrieves and locks message – Complete(), Abandon(), Defer() or

Deadletter()

DemoUsing Service Bus Queues

Topics & Subscriptions

ServiceService Bus

Topic

Service BusSubscription

Service BusSubscription

Client

ClientClient

Client

Topics & Subscriptions

• Create a Topic• Publisher sends messages to Topic• Service Bus forwards messages to

Subscriptions• Subscribers retrieve and handle

messages from Subscriptions

Topics & Subscriptions – Cont.• Builds on Service Bus Queues• Relies on BrokeredMessage– Supports same features• Deadlettering, retrieval mode etc per

Subscription

DemoUsing Service Bus Topics

Subscription Filters

• Filters Topic messages based on SQL statement

• Declared at Subscription creation time

DemoAdding a Subscription Filter

Deadlettering

• Poison messages– MaxDeliveryCount

• EnableDeadLetteringOnMessageExpiration– BrokeredMessage.TimeToLive– <Target>.DefaultMessageTimeToLive

• Deadletter– MyQueue/$DeadLetterQueue– <Target>Client.FormatDeadLetterPath()

• Queue must be emptied!!!

DemoUsing deadlettering

Autoforwarding

Client OrdersOrdersEurope

Region=‘Europe’

OrdersAsia

Region=‘Asia’

OrdersUsa

Region=‘Usa’

Asia

Europe

Usa

MrZog

Supplier=‘MrZog’MrZog

MrZog

Supplier=‘MrZog’

MrZog

Supplier=‘MrZog’

Topic Subscription Queue

DemoUsing autoforwarding

Service Bus Notification Hubs

Thank you! Any Questions?

Chris [email protected] | @ZeroKoll

http://chris.59north.com/