Building SaaSApplications on Microsoft Azure. November 2011

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1 Building SaaSApplications on Microsoft Azure November Zensar Technologies 2011

2 Software as a Service (SaaS) Various Dimensions What is SaaS SaaS is a Software Delivery Model ( As a Service as against Licensed ) where the Software is Hosted centrally Accessed through internet Normally accessed using thin client (browser) Business Subscription based rather than Purchasing Normally pay-per-use payment models Operations Easy Deployment and upgrades Quick scale-out Normally a single code set Technology Multi-tenancy Data segregation Configuration / Personalization Zensar Technologies

Subscription based rather than Purchasing Normally pay-per-use payment models Operations Easy Deployment and upgrades Quick

3 SaaS Different Levels Diff. code Diff. instances Same code Diff. instances Same code Same instance Same code Horizontally scaled instances Source: MSDN Article Zensar Technologies

instances Source: MSDN Article 2006 http://msdn.microsoft.

4 SaaS Characteristics Tenant Management Super Admin Tenant creation Subscription plan creation Usage monitoring app level Super Admin SaaS Application (Same instance for different tenants) How to achieve Multi-tenancy Separate DBs Same DB Separate Schemas Same DB Same Schema Tenant Admin User creation Configuration Usage monitoring tenant level Tenant Users Access business functionality User level configuration (if provided) Tenant Admin Users Tenant 1 Tenant Admin Users Tenant 2 Tenant Admin Users Tenant n Tenant specific Configuration Branding (Logos, etc.) Colour themes UI positioning Tenant-specific Fields Zensar Technologies

monitoring tenant level Tenant Users Access business functionality User level configuration (if provided) Tenant Admin Users Tenant 1 Tenant Admin Users Tenant 2

5 SaaSApplication on Microsoft Azure Combining the power of SaaS and Cloud Scaling: SaaSapplication requires Scaling -Azure makes it very easy not only to scale-up but also to scale-down Application can be divided into multiple web / worker roles to be scaled according to requirement Application can be deployed to specific geography Pay-per-use model of SaaSapplication is backed up by the same model at the platform level Use of Content Delivery Network for large BLOB content Other inherent Cloud advantages No upfront infrastructure cost No upfront licensing cost Zensar Technologies

deployed to specific geography Pay-per-use model of SaaSapplication is backed up by the same model at the platform level Use of Content Delivery

6 Case Study ZenAutoPro ZenAutoProisa cloud hosted (Microsoft Azure)applicationfor Automation Test Scripts generation that can be used by multiple customers / internal testing teams on "As A Service" basis. Business Challenge Testing Professionals need separate licenses to generate automated Test Script The initial system was developed as a desktop application needing separate installations. Difficult to make customer-specific changes and maintain each of them Solution Provided Developed Cloud enabled Web Application using Windows Azure cloud Use of SaaSFramework developed by Zensar to implement standard SaaS features Separate Schemas are maintained to achieve data segregation among different customers Azure Diagnostics to maintain the Logs Customer Benefit Possible reduction in licensing cost Reduced Infrastructure and Software maintenance cost Easier deployment, maintenance and support Dynamic scalability (easy scale up and scale down) Zensar Technologies

Difficult to make customer-specific changes and maintain each of them Solution Provided Developed Cloud enabled Web Application using Windows Azure cloud Use of SaaSFramework developed by Zensar to

7 SaaSApplications Need for Framework Based Approach SaaSApp 1 Business Functionality Tenant Management Metering and Billing Configurability/ Branding SaaSApp 2 Business Functionality Tenant Management Metering and Billing Configurability/ Branding SaaSApp 1 and App 2 are independently implementing very similar SaaS-specific features Duplication of code/efforts Missing out / insufficient implementation of standard SaaS features A Better Approach would be as below SaaSApp 1 Business Functionality SaaSFramework Components Tenant Mgmt Metering/Billing Configurability SaaSApp 2 Standard SaaSfeatures Business Functionality SaaSFramework Components Tenant Mgmt Metering/Billing Configurability implemented once in the SaaS framework and Re-usedby all applications Applications can concentrate on business functionality Zensar Technologies

implementation of standard SaaS features A Better Approach would be as below SaaSApp 1 Business Functionality SaaSFramework Components Tenant Mgmt Metering/Billing Configurability SaaSApp 2 Standard

8 SaaS Framework System Architecture Zensar Technologies

9 Mapping a typical SaaS application to Azure Zensar Technologies

10 Summary Benefits of Framework based approach on Azure Flexibility of starting-small still maintaining the scalability SQL Azure allowed Multi-tenancy to be achieved different schema level in the same database Very small learning curve for team members Tenant Management and Metering/Billing became highly configurable Tenant name and fields, UDFs, Subscription types, User defined transactions, Billing cycles Configurability At SaaSprovider level At Tenant level Zensar Technologies

members Tenant Management and Metering/Billing became highly configurable Tenant name and fields, UDFs, Subscription types,

11 Thank you Zensar Technologies 2011

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