Embed Size (px)
Citation preview
Why am I qualified to talk to you?
Robin Schroeder
• Coding since 1998 - VBA, Java, VB6, SQL, web applications
• Started C# in 2008, Win 8.1, and UWP
• Full Stack - Mostly Middle and Front-End, Backend Azure
• Currently specializing in Xamarin mobile, UWP, iOS and Android
• Photography, Guitar, 3D Printing, Hololens, Unity, etc
• Fox Valley Girls Coding Club
“Being a small shop, we have thrived by learning how to do more with
less. We share our techniques that leverage code generation and inspire
others to rethink their approach to software craftsmanship.” -Paul
What are we going to talk about?• Tooling
• Mobile Data Storage & GUIDs
• Sample Project – Bingo Buzz
• Cross Platform Mobile Architecture (Xamarin Specific)
• Dependency Injection & Platform Specific Code
• Memory Management
• Enterprise Plugins
• Authentication
• App Center: Analytics, Metrics, Crashes & CI/CD
• Application Insights and Beyond
• App Store vs Enterprise Deployments
• Where to read more…
Tooling• Development
• Visual Studio 2017 on PC
• Visual Studio for Mac (MacBook & MacMini)
• XCode
• Telerik Fiddler / Orchestra (www.telerik.com/fiddler)
• SQLite Expert (www.sqliteexpert.com)
• Postman (www.getpostman.com)
• Code Maid VS Extension for PC
• Vysor (Android) and Reflector (iOS)
• Visual Studio App Center Account
• Apple Developer Program Membership
• Azure Account
• SQL Server Management Studio
Code Generation• Reverse POCO• CodeGenHero
S.O.L.I.D.
S – Single-responsibility principle
O – Open-closed principle
L – Liskov substitution principle
I – Interface segregation principle
D – Dependency Inversion principle
Two Mobile App Strategies for Data Storage
Long term data storage (SQLite, etc.)
Data connection not required – Offline CRUD
Generally not sensitive information
PK are generally GUIDs
Client DB schema usually mirrors server DB
Great candidate for Code Generation
No long term storage
Data connection required
Security sensitive information
PKs aren't important
DTOs don't match source DB
OK candidate for Code Generation
Capturing Data with GUIDs
Multiple Devices
Running SQLiteOne Central
Cloud DB
Use GUIDs as the primary key datatype
GUID = Global Unique Identifier
UUID = Universally Unique Identifier
72468510-244a-4af5-bd8e-f8820c211b6c
Sample Project: BingoBuzz
https://github.com/MSCTek/CodeGenHero/tree/dev/src/Samples/BingoBuzz
What the heck is BingoBuzz?
Virtual meeting bingo game!
• Game is played as a virtual meeting is occurring
• All players have a randomized game board
• Players tap squares matching meeting events
• All phones 'buzz' when someone gets bingo
• Scores and stats are persisted
• Basically, it makes boring meetings fun
Technologies:
• Xamarin.Forms client - iOS, Android & UWP
• WebAPI and Azure SQL DB
BingoBuzzhttps://www.dropbox.com/s/h4i9csvoem6pwtc/BingoBuzzDemo.MP4?dl=0
So…Where do the biz rules go?
• .Net Standard 2.0 Xamarin.Forms
• Resources for shared assets
• Controls for shared UI pieces
popups, header, icon label
• ModelData for SQLite
• Helpers for high level biz rules
• ModelObj for more specific biz rules
These are partial classes
• ViewModels for INPC & MVVM
Only minimal biz rules here
• Views for UI
No Biz rules here
• Services, Interfaces & Modules for DI
• Generated CodeNo generated code in the platform specific projects
Handwritten partial models kept in Extensions folder
CodeGenHero configuration has its own project (bottom)
WebAPI
DTO
Data Transfer
Objects
Object Model
INPC
ViewModel
ViewWHY?
Serializable
In and out of
JSON
WHY?
Storable in
SQLite
No children
DataModel
SQLite
WHY?
Object ModelINotifyPropertyChanged
map map
MVVM Mobile Data FLOW
All your model are belong to us
Service Layer Data Flow
DTO <-> DataModel
Demo Data
DataLoaderService
WebAPI
DataLoaderService
SQLite
DataModel
DataModel <->ObjModel
Unit Tests
Mock DataService
ViewModels
DataService
DTO -> DataModel -> ObjModel
IDataLoaderService
IDataService
What Can Be Generated?
DTO <-> DataModel
Demo Data
DataLoaderService
WebAPI
DataLoaderService
SQLite
DataModel
DataModel <->ObjModel
Unit Tests
Mock DataService
ViewModels
DataService
DTO -> DataModel -> ObjModel
IDataLoaderService
IDataService
Dependency Injection
Graphic From: https://docs.microsoft.com/en-us/aspnet/mvc/overview/older-versions/hands-on-labs/aspnet-mvc-4-dependency-injection
public MyViewModel (IDataService iDS, IAnalyticsService iAS, ILoggingService iLS,
IPermissionsService iPS, ILocationService iLocS)
{
//Now I have an instance of each of the services I need to make a new viewmodel
//and the specific type of that service can vary based on my platform or test
}
Platform Specific Code
FRONT END: The client
wants the text fields look
exactly the same on all
three platforms: yellow
background with purple
border and green text.
How do I do that???
BACK END: I need to store my SQLite database in a different place on each
platform specific file system,
but the db connection needs to be used by the
shared business logic.
How do I do that???
Platform Specific Services
Custom Renderers
Xamarin Effects
SHARED CODE: I need to hide the Bluetooth printing button in my app on UWP, but show the same button
in iOS and Android.
How do I do that???
Detect the OS in a conditional
Memory Management• New is Glue
• In XF, we worry about:
• Apps that use lots of pictures, videos, pdfs, data
• Apps that will be open all day
• Worry most about Android, less about iOS, not at all about UWP
• Worry some about Xamarin.iOS outside of XF
• Xamarin Profiler – stand alone app
• Build/run your iOS or Android app, then run it again in Xamarin Profiler
• Take snapshots to see improvements between builds
• Works on Visual Studio Enterprise 2017 on a PC or Visual Studio for Mac
• Version must be kept in sync with VS
• Alternatives:
• Instruments for iOS
• DI Memory Reporter Service (like the one in Bingo Buzz)
• Use Diagnostic Tools in VS for UWP (if you must)
“The point of "New is Glue" is not
to say that "new is bad", but
rather to raise awareness. You
should think about the fact that
you're tightly coupling the current
function or class to a particular
implementation when you use the
new keyword. In many cases,
after briefly considering this, you'll
conclude that you're fine with the
coupling and continue on. But in
some cases you may realize that
you're about to add tight
coupling to an implementation,
and the current code isn't where
you want to make that decision. ”
@ardalis
App is loading
User entering
Welcome page
Game board
Welcome page
Statistics page
Welcome page
Game board
Welcome page
Allocations on only live objects!
Plugins & Components
Be Careful with Plugins in Enterprise Applications!
• Required dependencies?
• Is the Nuget in Preview? (exception MSAL)
• When was the last time this plugin was updated on Git?
• Do I know anything about the author?
• What are the git issue history related to the plugin?
• Does it make more sense to learn from the open source code and bake only the functionality I need into my project?
• 3rd Party Components - Syncfusion, Telerik, Mr Gestures, Infragistics, etc.
• Major Exceptions
• James Montemagno’s Xamarin.Essentials will probably always work
• Xamarin.Android Support libraries – don’t update until you are absolutely forced
Azure Active Directory B2C
Azure Active Directory Business to Consumer
Same system that handles Office 365 – high availability and secure.
Free up to 50,000 users. Can use Facebook, make a local account, etc.
Great documentation. You can customize the UI. If you don’t want to use it
for production, it works well for Dev and QA.
https://azure.microsoft.com/en-us/services/active-directory-b2c/
CLIENT LIBS: MSAL & ADAL
• MSAL – Azure AD v2.0: MicroSoft Authentication Library
• technically in “production-ready preview”
• Supports industry-standard OAuth 2.0
• Supports OpenID Connect 1.0 protocols
• ADAL – Azure AD v1.0: Azure Active Directory Authentication Libraries
• Older libraries
https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-v2-libraries
App Center is Great
• Build – Works great for iOS and Android, no so much for UWP
• Test – Xamarin Test Cloud = Awesome
• Distribute – Great for QA and Enterprise Distributions
• Diagnostics – Crashes and errors with stack traces
• Analytics – Events and real time log flow – you can pipe these into Azure
Application Insights and then on to Power BI
• Push Notifications – To a group or an individual (via InstallationId), very easy
to set up, silent (ios only) and non-silent (ios and droid), toast notifications in
UWP – huge improvement over doing this for each platform.
Application Insights
• Everything is recorded as a Custom Event in
Application Insights
• Need to export if you want to save more than
60 days of analytics data
• Application Insights can dump into Power BI
easily
union customEvents| where timestamp between(datetime("2018-10-13T00:00:00.000Z")..datetime("2018-10-14T00:00:00.000Z"))| summarize Sessions=dcount(session_Id) by bin(timestamp, 1h)| order by timestamp asc| render barchart
Enterprise Deployments
App Stores• iTunes:
• Requires a real person reviews the app
• Expect to be rejected the first time for something minor
• You will need to create a production user and include credentials with app submission, this can sometimes be tricky when promoting code into prod and waiting for the store to review your app
• Hard to nail down exactly when the app will be ready for release – allow 4-5 days to be safe. Minor resubmissions can usually bedone in 24-36 hours during the week.
• Allow another 12 hours to be fully indexed in the iTunes store search
• Expect that your app size will DOUBLE once the build hits the store!
• Expect that you will not be able to modify app metadata without a store resubmission
• $100 a year, D&B number required for companies
• Google Play:
• Digital review, takes about 5 minutes, no human required
• Has really cool built-in tools for submitting potential release candidates so you can test in parallel
• Lots of tools for sifting through the thousands of android devices and deciding which ones your app should be available on
• Easy to modify the metadata for your app
• $25 one time payment
• Windows Store
• App in the Windows store that you run against your release build that catches problems
Where to read more…
