Forms + azure
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My Slide deck from Xamarin Dev Days at Trivandrum
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Forms + azure
- 1. Amal Dev Forms + Azure Dev Days
- 2. About Me !!! Microsoft MVP 10+ years of professional experience Blogger Speaker Full Stack Web Developer in Microsoft Technologies Technical Analyst with UST Global
- 3. We Apps! 189M downloads a day 200 mins on phone 127 mins in apps
- 4. The average app user has 36 apps installed on his or her phone.
- 5. Only 1/4 are used daily:
- 6. 1/4 of apps are never used!
- 12. Offline Storage to your rescue !!!
- 13. What about a backend ?
- 14. PlentyofOptions
- 15. Infrastructure designed for Scale 100+ datacenters Top 3 networks in the world 2x AWS, 6x Google DC Regions G Series – Largest VM in World 32 cores, 448GB RAM, SSD…. Operational Announced * Operated by 21Vianet Azure compute regions open today More than AWS and Google Cloud combined Datacenters recently added in Canada and India
- 16. Why Azure ? • Extremely Powerful • Flexible • Easy Tables • App Service • C# SDKs available everywhere. • C#-iOS, Android & Windows with Xamarin • C# clients, written by C# developers(open source) • C# backend with ASP.NET
- 17. Shared C# codebase • 100% native API access • High performance iOS C# UI Android C# UI Windows C# UI Azure Linux/Mono CoreCLR Shared C# Mobile C# Server Shared C# Client/Server Xamarin Apps + Backend Services
- 18. RESTAPI AzureMobileApps Facebook Twitter Microsoft Google Azure Active Directory WindowsAndroid Chrome iOS OSX In-AppKindle Backend code SQL Tables O365 Offline Sync Offline sync
- 20. How offline sync works
- 21. Let’s add a backend
- 22. Create a MobileService MobileService = new MobileServiceClient( "https://myapp.azurewebsites.net");
- 23. Create Tables IMobileServiceSyncTable<TodoItem> syncTable; public async Task Init() { const string path = "syncstore.db"; var db = new MobileServiceSQLiteStore(path); db.DefineTable<TodoItem>(); await MobileService.SyncContext.InitializeAsync(db); syncTable = MobileService.GetSyncTable<TodoItem>(); }
- 24. Push and pull with synctable private async Task SyncAsync() { await MobileService.SyncContext.PushAsync(); var query = syncTable.CreateQuery(); await syncTable.PullAsync("todoItems", query); } private async Task InsertTodoItem(TodoItem todoItem) { await syncTable.InsertAsync(todoItem); await MobileService.SyncContext.PushAsync(); }
- 25. Query localtable public async Task<IEnumerable<TodoItem>> GetOpenItemsAsync() { return await todoTable .Where(item => item.Complete == false) .ToEnumerableAsync(); }
- 26. DEMO
- 27. Thank You Read my blogs at www.techrepository.in Read my tweets @amaldevv
Editor's Notes
- There are areound 189M downloads are happening every day On an average an user spends around 200 mins on phone and in that 127 minutes are spent on various apps
- We all have installed loads of app in your expanding and with latest advancements in storage technology it’s only going to increase
- Tell me how many apps you use on a daily basis, only a few right ? Mail, Whatsapp, Search, FB, Twitter
- There are loads of app sitting in our phone which we haven’t bothered to take a second look at it after installation
- Story of IFSC code app
- Combined map of 2g , 3g and 4g - US
- Combined map of 2g , 3g and 4g – Africa, SE Asia
- Only 4g- Africa and SE Asia
- Helps devs to create apps that are functional even in the absence of network connection In offline mode , users will be able to create and modify data which will be saved in a local data store When the app is back online, it syncs the local data with the backend It also include support for detecting conflicts in cases such when the same record is modified at both client and backend And also conflicts can be handled at both the ends,
- Azure portal demo
- MobileServiceClient table is used to connect to the backend
- Sync Table Sync table api should be used to support offline mode. Remember that you needs to initialize the local store first before any sync operations Local Store Is the data persistence layer in the client device. SDK provides a default local store implementation. For Windows, xamarin and android it’s based on SQLite and for iOS its based on Core.Data Sync Context Is associated with mobile service client object such as IMobileServiceClient and tracks changes made in the sync tables. It maintains an operation queue which keeps an ordered list of all the crud operations Initalize local store first, creates a sql lite db using mobileservice Create a table using Define table method, schema to be used is derived from ToDoItem table IMobileServiceSyncTable is used instead of IMobileServiceTable Uses a local database for all the crud operations and the sync context preserves the table relationships by tracking Working While using sync table, the client code controls the syncing of the data to the backend. The data will be sent only when push call is made, similarly the data will be pulled from the backend via an explicity call only. No auto sync in there Push Operation on the sync context which sends all the changes since the last push. Please note that all the changes are sent at once and there is no option to sync individual tables. The SDK makes some REST API calls to send the data to the mobile backend which in turn inserts it to the server store Pull Pull is done based on per-table basis and customized to pull only a subset of data, then the Azure SDK inserts the data into the local data store Implicit Pushes If a pull is executed against a table that has pending local updates, it will first execute a push on the sync context which helps to minimize the conflict between your local changes and the new data from the server Incremental Pushes First parameter for a pull operation is query-name, if nothing is specified then the SDK will perform a incremental sync. In this case whenever a pull operation returns a set of results the latest updatedAt timestamp from that resultset is stored in SDK local system tables, subsequent pull will return records only after that timestamp
- Code is not ideal for production env, for real world scenarios you need to write code in a way such that the data is synced when the network state changes SyncAsync is used to sync all your offline data with the backend To insert data we use InsertAsync method to insert the data into the local store and then calls the push method to sync it up with the backend Similary we will do that for update and delete operations