Connected & Disconnected Apps with Azure Mobile Apps
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Learn how to make fully functional connected apps without internet connection using Xamarin and Azure Mobile Apps Service. Slides from my talk at Xamarin Dev Days held at CET Trivandrum
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Connected & Disconnected Apps with Azure Mobile Apps
- 5. We Apps! 189M downloads a day 200 mins on phone 127 mins in apps
- 6. The average app user has 36 apps installed on his or her phone.
- 7. Only 1/4 are used daily:
- 8. 1/4 of apps are never used!
- 15. PlentyofOptions
- 18. RESTAPI Offline sync Facebook Twitter Microsoft Google Azure Active Directory Azure Mobile Apps WindowsAndroid Chrome iOS OSX In-AppKindle Backend code SQL MongoTables O365 API Apps Offline Sync
- 20. How offline sync works
- 22. Create a Mobile Service 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 sync table 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 local table public async Task<IEnumerable<TodoItem>> GetOpenItemsAsync() { return await todoTable .Where(item => item.Complete == false) .ToEnumerableAsync(); }
- 27. Shared C# codebase • 100% native API access • High performance iOS C# UI Windows C# UIAndroid C# UI Shared C# Mobile C# Server Linux/Mono CoreCLRAzure Shared C# Client/Server
Notes de l'éditeur
- We all have installed lots of app in your mobile device 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
- And you get all the goodness shown in the previous slides across the WW
- Extremely powerful You can do almost anything your backend would ever need to do with Azure. Data storage, authentication/authorization, push notifications, custom APIs, blob storage, etc. Flexible Need something lightweight? Azure is there. Need something robust and powerful? Azure is there. C# clients I’m a frontend developer, I care a lot about how easy this makes MY job (selfish) Many C# clients are written by Java developers, etc. Easy to use C# client Abstracts away much of pain of using a RESTful API C# Features Async / Await / TPL Uses C# idioms Properties, Fluent API Seems obvious, but not always true (first class citizen)
- 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,
- 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
- What if a GetAll should only return favorites for that user.
- Backend deletes expired handles when PNS rejects them Maintain mapping between logical users/groups and device handles
- With Xamarin it just isn’t your front end in C# it is your full backend server as well. With Azure or even on Linux running Mono or the CoreCLR your app is fully C# end to end!
- Get started today with free 30 day trial of Xamarin at xamarin.com