Building Cross Platform Mobile Apps Powered by AzureChris J.T. AuldDirector - Intergen

AZR225

Session Objectives and Takeaways

Session Objective(s): Understand common patterns for migrating on-prem to AzureSee an approach to using SQL Azure FederationsSee various approaches for using the Azure Service BusUnderstand options and approaches for mobile front-ends

Moving to Azure needs more than mere compatibilityFederations allow almost unlimited scale outMono is a reasonable approach for x-platform mobility‘Super-Simple’ to consume Service bus from mobile

Web Application Layer (UI)

What is StockTrader?

N-tier application Web tier: ASP.NETMiddle tier(s): .NET WCF ServicesData tier: SQL Server/SQL Azure

Many modes of operationsSingle boxScale-out across clusterOn-premise or Windows AzureAcross hybrid clouds

High PerformanceBenchmarks Benchmark/capacity planner tool included

SecureData tier securityCommunication and message security

Use

r Inte

rface

Mid

dle

Tie

r B

usin

ess S

erv

ices

Data

Acce

ss

SQL Server/SQL Azure

Account Table

Account Profile Table

Orders Table

Holdings Table

Quote Table

Data Access Layer (DAL)

Market Summary Class

Customer Class Orders Class

Middle-Tier Business Services Layer (BSL)Business Service Layer

Core StockTraderServices Classes

Business Transactions

ServiceClient Class

Order Processor Service (OPS)

ServiceClient Class

Order Processing Service Class

Ord

ers

Tie

r

https://azurestocktrader.cloudapp.net

ASP.NET Web Forms

Business Transactions

StockTrader DB

SQL Server

Internet

DMZ

Firewall

ForeFront TMG

StockTrader Order

Processor Service

StockTrader Business Services

StockTrader Web

Application

System Center/VMM Managed Private Cloud

VMVM

VMVM

VMVM

VMVM

VMVM

VMVM

StockTrader On Premise Architecture

Windows Azure Platform

DMZ

StockTrader DB

SQL Server

StockTrader Azure Migration: Azure Lift and Shift

Windows AzureWeb Role

Azure StockTrader

Web Application

Windows Azure Worker Role

Azure StockTrader

Order ProcessorService

Windows Azure Web Role

Azure StockTrader Business Services

StockTrader DB

SQL Azure

Https andClient

Certificate

Net.tcp encrypted andClient Certificate

SQL Encrypted

SQL Encrypted

Firewall

ForeFront TMG

System Center/VMM Managed Private Cloud

Internet

StockTrader DB

Scale-outInstances

Scale-outInstances

Scale-outInstances

StockTrader Business Services

StockTrader Order

Processor Service

StockTrader Web

Application

VMVM

VMVM

VMVM

VMVM

VMVM

VMVM

StockTrader Business Service

StockTrader Order

Processor Service

StockTrader Web

Application

VMVM

VMVM

VMVM

VMVM

VMVM

VMVM

Firewall

ForeFront TMG

Existing On Premise Application

3 Objectives for StockTrader v6

1. Separate Exchange and Brokerage Aspects1. Split database2. Show Cloud B2B Scenario

2. Scale at the data tier1. Scale out using federations

3. Deliver rich experiences expected of apps today1. Mobile; All common platforms2. HTML5+JS3. Windows 8

StockTrader Azure Migration: Azure Optimized

Windows AzureWeb Role

Azure StockTrader

Web Application

Windows Azure Worker Role

Azure StockTrader

Order ProcessorService

Windows Azure Web Role

Azure StockTrader Business Services

AccountDB

SQL Azure

Scale-outInstancesScale-out

Instances

Scale-outInstances

QuoteDB

SQL Azure

queue topicsubs

RESTful Endpoint+ Token Service

Topic(s)subs

subs

subs…

Polling

Publishing

demo

StockTrader v6All-Up Demo

Azure Optimized vs Compatible

Critical changes for cloud scale applicationsStateless Application/Web TierScale out database tier of RDBMS is used Some services not supported e.g. distributed txn hard

Opportunities for optimizationService bus for messagingService bus for offload of polling

Optimizing

Scale Out Data TierUsing SQL AzureFederations

Using SQL Azure

Key Benefits

High availability without any additional effortFull TDS + T-SQL CompatabilityCode just works

Key Challenges

Limited Scale-UpQuery throttle means performance is non-deterministicNo point-in-time backup

If you are using SQL Azure for a large scale application you must consider implementing data

tier scale out

StockTrader versions up to v5

Account

AccountProfile

Holding

Orders

Quote

QuoteFederationKey=QuoteSymbol

AccountFederationKey = UserID

StockTrader v6AccountDB

QuoteDB

NewsTopics

AccountAccountProfile

HoldingOrders

AccountDevice

Quote

QuoteSymbol

demo

Federations Configuration

Moving to Federations

Federation KeyInt/UniqueIdentifier/VarbinaryWe had varchar so convert to varbinary in app layer

Primary KeysIdentity columns not supportedMoved to Uniqueidentifier Flowed through to service layerUse string in service layer; cast to Int/Guid for OnPrem/Cloud

Moving to Federations

Application ConnectivityNeed to USE FEDERATION when connectingMust use robust retry logic to support SQL AzureShow Federation.cs

Fan-Out QueriesRequired to retrieve lists of quotesSet filtering off and query each member sequentiallyRoom for optimization here come to AZR432 on Friday

Multiple DatabasesMove to multiple databases was not necessarily requiredCould have defined two Federations in a single DB

Transaction Scopes and Federations

Can’t connect to federation member while enlisted in transactionConnection pooling has issues as USE FEDERATION changes connection contextusing (var scope = new TransactionScope())

{ using (var connection = new SqlConnection(…)) { // enlists in current transaction connection.Open(); // Run SQL statements // doesn’t actually commit txn scope.Complete(); }}

using (var connection = new SqlConnection(…)){ connection.Open(); using (var scope = new TransactionScope()) { // Run statement to connect to right // federation (txn scope is ignored as // connection not enlisted)

connection.EnlistTransaction(scope); // Run SQL statements scope.Complete(); }}

A Quick note on Transactions

StockTrader OnPremise uses MSMQ + SQL Server incl MSDTCBoth Service Bus and SQL Azure support transactions including use of TransactionScopeNeither supports enlisting in transaction managed by MSDTC

i.e. No support for distributed transactions

No transaction support across federation membersNeed to suppress the transaction scope when working with the service bususing (new

TransactionScope(TransactionScopeOption.Suppress)) {}

For much more on Federations

AZR432: SQL Azure Federations Deep DiveChris AuldCentral C2/1/2012 0945hr -1100hr

Optimizing

De-coupling BSL from Ordering using Azure Service Bus

Messaging - Before

MSMQ (on-prem)

[Brokerage] Business Services

[Exchange]Order Processing

Service

Async Request

Quotes /Accounts

Messaging – Via Service Bus

ServiceBus

[Brokerage] Business Services

[Exchange]Order Processing

Service

Quotes /Accounts

Async Request Queue

Async Response Topic

Quotes /AccountsAccounts

Quotes /Accounts

Quotes /AccountsQuotes

Messaging – More Brokerages

ServiceBus

[Brokerage] Business Services [Exchange]

Order Processing Service

Async Request Queue

Async Response Topic

Quotes /Accounts

Quotes /AccountsQuotes

[Brokerage] Business Services

[Brokerage] Business Services

SEND permission

LISTEN permission+ rules

LISTEN permission + rules

LISTEN permission + rulessu

bsu

bsu

b

Service Bus: Notes on Implementation

Two separate contractsIOrderProcessorIOrderProcessorResponse

Just ‘plain–old ‘ WCFHosting

OPS explicitly hosted as a Worker RoleBSL hosted within IIS; use auto-start to ensure it is running

Brokered Messaging

Brokered MessagingQueued via Queues and TopicsRule based routing

Need to add metadata to messageShow ServiceBusMessageInspectorInject SB username into message on clientEcho sent SB username into message on server

Apply filters against the ‘sender’Show rules in SBExplorer

Optimizing

Service Bus for High Volume Messaging

High Volume Messaging

Our ScenarioReal time newsThousands of mobile clients‘Currently’ Polling our web roles at high frequency

End Goal1. Offload polling from Web Roles to SB

Other options also available. E.g. Windows Azure Mobile Services

Azure ServiceBus On-demand Topic Scale-out

StockTrader

System

Service Bus

News

News_1

Subscription

Subscription

Subscription

RegistrationService

2 .. 1999

New UX

Delivering cross platform clients toAndroid, iOS, Windows 8 and Windows Phone

Cross Platform Mobile App DevHTML5 (+ PhoneGap)

Doesn’t look nativeEverything like iOS?

No AppStore discoveryX-Browser issuesNo offline on WP7Animations are poorNot all APIs availableeven with PGIt’s Javascript

Mono

C# + .NET in VS.NETLambdas, LINQDelegates, Events

Access to almost all platform APIs via Mono WrappersGo native if neededUI still written ‘by-hand’

Native

Platform specific UXWrite the app 3 times

3 different languages3 x code to maintainObjective C is awful

100% Shared Code 0% Shared Code

Shared CodeShared files co-located; *.csproj for each platformEach solution has

Platform specific projectShared project

Similar MVVM pattern for all platformsShared ModelsShared RepositoryProbably could have shared ViewModels too…

Can use shared Interface + Platform Specific Implementation

WindowsPhonePreferencesProvider: IDevicePreferencesProvider

Show Android and Windows 8 Solutions

Consuming the Azure Service BusAll done from Shared codePolling on a timer‘Register’ device – on first login

Service creates subscriptions (and additional topic if needed)Returns subscription details to client

Auth using service busGet an ACS (WRAP) token for the service busStore token + timeoutPass token with request to SB for messagesDelete messages from subscription once done

Show StockTraderPollingNewsRepository.cs

In Review: Session Objectives and Takeaways

Session Objective(s): Understand common patterns for migrating on-prem to AzureSee an approach to using SQL Azure FederationsSee various approaches for using the Azure Service BusUnderstand options and approaches for mobile front-ends

Moving to Azure needs more than mere compatibilityFederations allow almost unlimited scale outMono is a reasonable approach for x-platform mobility‘Super-Simple’ to consume Service bus from mobile

Related Content

AZR432 – SQL Azure Federations Deep Dive

Find Me Later At Microsoft Pods in Exhibition Area

Code will be released in next few weeks. Keep an eye on www.syringe.net.nz

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part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.