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Cai Zonghe / NCS Pte Ltd t: @caizonghee: [email protected]: studiohub.wordpress.com
Introduction to WF
Context of WF in Azure
Migration/development options
Quick Dive Demo (Basic WF)
Quick Dive Demo (Advanced WF)
Partial Demo (Azure Composite Application)
Introduction to WF
Context of WF in Azure
Migration/development options
Quick Dive Demo (Basic WF)
Quick Dive Demo (Advanced WF)
Partial Demo (Azure Composite Application)
Long running processes◦ Seconds / Minutes / Days / Months / Years
◦ System / Human
◦ Unreliable external world
Systems fail
People forget
Complex processes◦ Declarative representation of a process
◦ Easy to validate
◦ Increase maintainability
Versions:◦ .Net 3.0 / 3.5 – Sequence / State Machines
◦ .Net 4.0 – Sequence / Flowchart
◦ .Net 4.0 Update 1 – State Machines
◦ .Net 4.5 (Upcoming) – Contract First WF / Version Handling / C# Support
Hosting◦ Self Host – Windows Service / Exe
◦ IIS / WAS – [Windows Workflow Service Application]
Introduction to WF
Context of WF in Azure
Migration/development options
Quick Dive Demo (Basic WF)
Quick Dive Demo (Advanced WF)
Partial Demo (Azure Composite Application)
Handled by Batchjobs on premise◦ Mainframe concept, batch window / duration
◦ “Free”
◦ BJ mapped to worker roles in Azure
Not feasible to spin up workers / effective polling
Responsible for framework level stuff
Multi-threading, lock management, etc
Recovery from errors
Monitoring
WF is built to be used by multiple systems◦ Simple process workflow / complex business processes
◦ Resource queuing / lock mangement etc
◦ Recovery from errors
◦ Monitoring (with AppFabric)
Azure provides elastic scale
Azure AppFabric Composite Application◦ Monitoring
◦ Recovery
Introduction to WF
Context of WF in Azure
Migration/development options
Quick Dive Demo (Basic WF)
Quick Dive Demo (Advanced WF)
Partial Demo (Azure Composite Application)
Prerequisites◦ Microsoft .Net 4.0
◦ Microsoft .Net 4.0 Update 1
◦ Azure SDK 1.6 (Nov)
◦ Azure AppFabric Tools (June CTP)
◦ Azure / AzureSQL / CompApp Accounts
◦ Persistence scripts
<WinDir>\Microsoft.NET\Framework\v4.0.30319\SQL\en\
Current State◦ On-Premise WF Application with on-premise DB
.Net 4.0 Sequence WF
.Net 4.0 Update 1 State Machine WF
Requires WF Persistence
Requires Custom Property Persistance
References external WCF / Web services
Requires ability to suspend/resume/terminate running workflows
Cloud Option◦ On-Premise WF Application with Azure SQL DB
Run Schema.sql (Run this to clear DB for dev purpose)
Run Logic.sql
- High Overhead to configure Firewalls / Security / Network
- High Latency
Cloud Option◦ Azure Web Role hosting WF Application
Cloud Option◦ Azure Web Accelerator Project
Using Web Deploy
X Unable to publish endpoint [ WIP ]
Cloud Option◦ Azure AppFabric Composite Application
Different approach to looking at application
No more handling ServiceModel Client configuration for endpoints
Uses a service locator pattern to register and resolve deployed applications
Applications can be dynamically redeployed to scale
Provides representation of how the various components work together.
Cloud Option◦ Azure AppFabric Composite Application
Different approach to looking at application
No more handling ServiceModel Client configuration for endpoints
Uses a service locator pattern to register and resolve deployed applications
Applications can be dynamically redeployed to scale
Provides representation of how the various components work together.
Cloud Option◦ Azure AppFabric Composite Application
X CTP only
X Only if you can get an account
X A lot of configurations for Workflow
Quick Dive Demo (Basic WF)◦ Web App to place order via WF
service
◦ WF Service records order
◦ WF Service checks inventory
◦ WF Service calls payment service
◦ WF Service calls shipping service
◦ WF Service waits for shipping update
◦ WF Service completes when item delivered
Quick Dive Demo (Advanced WF)◦ How WF persistence is done
◦ How WF custom property persistence is done
◦ How to recover from WF errors
Partial Demo (Azure Composite Application)
