Social Photos - My presentation at Microsoft Tech Day

Social Photos How we make it

What is Social Photos?• Online social network for photographers and photo lovers.• Take a photo -> share• Like / dislike / commend• Follow other• List photo near current location

Location based feature

Social Photos integratesMicrosoft and non Microsofttechnologies seamlesslyhttp://socialphotos.codeplex.com

Step to do #1• Design a social network – GUI prototyping – Architect design – Database modeling• Web service: from client-server to client- cloud

Step to do #2• Different clients connects to social network – Windows Form / ASP.net – Windows Phone 7.1 – Android / iOS• Web for PC & Mobile: HTML5, CSS3, JavaScript• Visual Studio Light Switch• Q&A

Design “social photos”GUI Prototype Architect Database

GUI mock up: simple but work1. Hand sketch on white board2. Capture by phone camera3. Write script to explain4. Email or check-in to collaboration portal

GUI mock up: work betterSee demo

Social Photos Database design• 1 photo is owned by 1 user• 1 photo is classified by 0-n categories• 1 user can make 0-n comments on photo.

MS SQLServer, DB2, Oracle, MySQL, PostgreSQL, SQ Lite, SAP Sysbase, Informix…

Entity Framework: 3 ways to design• Database First: reverse engineer from existing DB.• Model First: visually model tables -> generate DB script• Code First: define class then -> generate DB script

Architect: Open, Simple, Efficient Communication Server Protocol ?

Architect: Open, Simple, Efficient• Web serviced server• Work well with Entity Framework• Upgrade to Cloud without rewriting client code

Problems• Uniform Data Access is hard – Standards exist • ODBC • JDBC • OLEDB • SOAP • WCF Service• Need a multiplatform-supported web service

HTTP - Websites (1992)• Support Verbs: CRUD operations – GET: select – PUT: update – POST: insert – DELETE: remove

SOAP web services (2000)

Inside SOAP• XML messages• HTTP Post only

RESTful web services (2006)• REST: representational State transfer• Each unique URL is a representation of some objects

A RESTful web service

OData – Open Data protocol• Open – Based on web standards: HTTP, AtomPub, JSON• Data – For querying and updating data – Different data sources (db, cms, files, etc.)• Protocol – Convention for representing data entities in AtomPub – Query string conventions for addressing and filtering data – Constrained HTTP operations for submitting request

SDKsJavaScript

ProducersSQL Azure SQL Reporting Services SharePoint 2010

OData and WCF Data Service

• Demo PhotoCloud.svc• Demo using LINQPad to build up query string

Demo PhotoClound.svc• Query: GET• Insert : POST – Url: http://localhost/SocialPhotos/PhotoCloud.svc/Categories – Header: User-Agent: Fiddler Content-Type: application/json Content-Type: application/json Host: localhost:88 Content-Length: 17 – Body: {"Name": "New Category"}• Update: PUT – Body: {"Name": "Black and White"}• Delete : DELETE

//page size = 2, get 3rd page of top rated (from p in PhotosLINQ where p.Likes > 0 orderby p.Likes descending select p).Skip(4).Take(2) http://localhost:88/SocialPhotos/PhotoCloudURI .svc/Photos()?$filter=(cast(Likes,Edm.Int32)) gt 0&$orderby=Likes desc&$skip=4&$top=2

REST ODataEssence Pattern, architecture style, Protocol enabling REST or approachQuerying capability N/A YOrder returned Have to create custom Ydata methodPaging returned Have to create custom Ydata method

SOAP RESTVerb POST POST, GET, DELETE, PUTResource Identification N/A YTransport protocol HTTP only HTTP, TCP, SMTP, JMS, MQ, BEEP, IIOPPayload format SOAP format POX, JSONBandwidth Heavier LighterUse proxy in client side Y NToolkit required Y NAuthorization Depend on app developers Webserver can help (with verbs)Advantages Easy to consume Human Readable Results Easy to build (no toolkit)

OData response formats

WCF Data Service - Interceptors// Define a query interceptor for the Orders entity set.[QueryInterceptor("Orders")] publicExpression<Func<Order, bool>> OnQueryOrders()Add custom logic to operation or to entity query – Validation – Restriction – Authorization – Logging

[QueryInterceptor("Branches")]public Expression<Func<Branch, bool>> OnQueryBranches(){ return (o) => o.Address != "Obsolete location";}[ChangeInterceptor("Customers")]public void OnCustomerAdd(Customer c, UpdateOperations ops){ if (ops == UpdateOperations.Add) { if (c.Name.Trim().Equals(String.Empty)) { throw new DataServiceException(403, "Customer names must not be empty"); } }}

CLIENT SIDE DEVELOPMENTWindows Phone 7.1 – Android – iOS – Web Mobile

New features in Windows Phone 7.1• Multi tasking• Back ground agent (back ground audio – transfer)• Access sensors: accelerometer, gyroscope, compass• Silverlight 4 built in• Support socket programming TCP – UDP• Get information of network• Push notification• Live titles

New features in Windows Phone 7.1• Visual Basic support• Advertising SDK• Web Browser control == IE9. Speed & HTML5• Local database == SQL CE• Isolated storage explorer• Add new launchers and choosers• Allow read only access user’s contacts & calendar• Program camera (raw frame, adjust focus)

New features in Windows Phone 7.1• Scheduler task• Encrypted credential store• Many and many more• ODATA Client !

OData for Windows Phone 7.1 URI WCF Data Service HTTP Entity EDM URI OData feed Framework Provider URI

OData for Windows Phone 7.1• DataServiceCollection<T>  Extends ObservableCollection<T>  Automatic change tracking• DataServiceContext  Data querying & updating  Client side change tracking  DataServiceQuery<TEntity> properties

OData for Windows Phone 7.1• DataServiceCollection<T>  LoadAsync(IQueryable<T>) 1. LINQ to DataServiceQuery<T> 2. URI  LoadCompleted event • Optional Handler • Handle errors, perform additional work

OData for Android

OData for iOS• http://odataobjc.codeplex.com/• See video demo

WEB FOR MOBILEHTML5, CSS3, JavaScript

Native app development pros -cons• Pros: – Performance – Features rich: camera, GPS, accelerometer, compass, calendar, contacts, SMS, … – GUI & usability fine tune• Cons: – Different programming languages: Windows Phone (C#, Visual Basic), Android (Java), iOS (Objective C) – Learning curve & maintaining cost is high

1. HTML 5- CSS3-JavaScript: PhoneGap, jQueryMobile, jQTouch, Sencha Touch,….2. Appcelerator’s Titanium Mobile: converts JavaScript to symbolic files then compile to native apps3. Porting apps: reuse code/ resource , modify code to adapt to each platform.

Demo• WebMobile on PC• WebMobile on WindowsPhone• WebMobile on Android

VISUAL STUDIO LIGHT SWITCH

Deploying LightSwitch apps

Data sources in LightSwitch SQL ServerSharePoint 2010

LightSwitch Architecture Data Access Middle TierClient Tier Submit Screens Methods Controls Queries Pipeline Data Workspace Data Workspace

The LightSwitch Development Experience Describe your data Author business logic Define custom queries Create screens for Customize screen Create custom common tasks layouts Silverlight controls Integrate with custom Define custom queries data sources

Requirements• Visual Studio Pro (or higher) + SP1• Visual Studio LightSwitch• Optional – Visual Studio SDK: For building VSIX packages – LightSwitch Extension Development Kit (coming soon)

LESSON LEARNED IN DEVELOPINGMULTIPLATFORM APPLICATIONS

• GUI – ARCHITECT- DB• Team Collaboration: Vision, Process, Attitude & Tool• Development Environment• Transparent communication

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Social Photos - My presentation at Microsoft Tech Day

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Social Photos - My presentation at Microsoft Tech Day Presentation Transcript