Developing Applications for Windows Azure Platform

Sudheer DhulipallaMicrosoft Corporation

Agenda

WHO WILL BENEFIT FROM THIS TALK TOPICS WHAT YOU’LL LEAVE WITH

• Cloud application developers

• Developers building on-premise .NET and non .NET applications leveraging cloud services

• Windows Azure Basics

• Windows Workflow foundation Basics

• Service Bus (Messaging Service) Basics

• Workflow service in the cloud

• Web (ASP), Worker (workflow) sample with Service Bus Queues

• Building applications with Windows Azure Platform

• Azure platform capabilities

Windows Azure• Microsoft’s cloud platform– Applications platform in the cloud that allows Microsoft

datacenters to host and run applications• Windows Azure is Designed for:– Incremental Scalability– Reliability, high availability and fault tolerance– Developer agility and open standards (HTTP REST)– Utility based (pay as you go)– Cost effective based on sharing of resources– Service Oriented – SLA driven

Storage

Compute

What is Windows Azure?

QUEUE

Windows Azure App - Typical ArchitectureLB

Web Role

(ASP, Web Services, Workflows, custom

code etc.)

Worker Role

(Web Services, Workflows, custom

code etc.)

Service Bus,Storage,

Cache etc.

WindowsAzure.Com

Code Walkthrough - Sample #1• Publishing a simple ASP page to Azure cloud– SDK and Tools setup– Portal sign up– Creating an ASP.NET WebRole project– Publishing the web page and accessing from local

Web RoleRunning ASP Page

Azure Cloud

Local Browser

WINDOWS WORKFLOW FOUNDATION

Host (.exe, IIS/WAS, WF Service/Server, …)

WF Runtime Extensions

Tracking

Persistence

…

What is Workflow Foundation?

• WF4 provides declarative authoring of programs that coordinate work

• Activities• Runtime• Tooling• Significant Features

– Web Services Integration– Flowchart style Workflows – Better Dataflow– Better programming model– State machine

• Part of .NET framework

Tooling

VS Designer

VS Debugger

Rehosted Designer

WorkflowActivity Library

Code Walkthrough – Workflow Samples #2

• Visual Studio Integration • Project types• Hello world sample• Procedural Workflow sample• Web Services (WCF) integration

Example Workflow Design Patterns in Azure

• WF is useful in building long running applications (long running business logic) in worker role

• WF can also run in Web Role as Workflow Service• Example patterns

– ASP (Web Role) OR WCF (Web Role) • Queues or Topics • Workflow (Worker role) • SQL Azure / Other Services

– Workflow Service (Web Role) • SQL Azure / Other services

Code Walkthrough - Sample #3• Publishing a Workflow Web service in the cloud– Creating a WCF service WebRole project and adding

workflow service to it– Publishing the service and accessing the service operations

from a WCF test client

Web RoleRunning Workflow

Service

Azure Cloud

Local Console App

WINDOWS AZURE SERVICE BUS(A MESSAGING SERVICE IN THE CLOUD)

Brokered Messaging Entities: Queues

• Durable Queues• Scheduled messages• Session based message streams • Transactions support • Sequential Message Log• HTTP / REST / WCF / .NET API support

S RQueue

Brokered Messaging Entities: Topics

• Durable topics and subscriptions • Sequential Message Log• Multiple subscribers over the log, each with own cur/locks• Subscribers can filter with rules and expressions on message

properties• HTTP / REST / WCF / .NET API support

S RTopic SubSub

Sub

Code Walkthrough - Sample #4• Publishing a project with web / worker roles– Web role hosting a web page– Worker role hosting a Workflow – Web to worker communication over Service Bus Queues– Local debugging and Dev Fabric

Web RoleRunning ASP

Page - messaging

through Queues

Worker Role running

workflow – messaging

through Queues

Local Browser

Azure Cloud

SB Queues

Windows Azure lets you manage applications, not virtual machines.

Summary

• We covered the basics of Windows Azure, Windows Workflow and Service Bus

• We walked through a few Azure code samples (hosting a web page, hosting workflow in the web role and hosting workflow in the worker role and using Service Bus queues for communication)

• Developers can use Visual Studio, .NET frameworks, Azure cloud services, other languages and frameworks of their choice to build cloud applications and services

• You can sign up for free trial today at http://windowsazure.com and start building cloud applications with Windows Azure