Building Server Applications with SOA and WebAPI

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Николай Костов - блог за програмиранеC# курс, програмиране, безплатно

Building Server Applications with SOA

and WebAPI

Doncho Minkov

Telerik Software Academyhttp://academy.telerik.com

Technical Trainerhttp://minkov.it

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Николай Костов - блог за програмиранеC# курс, програмиране, безплатно Table of Contents

Application Layers Data Layer Repositories Layer Services Layer

The repository pattern Creating repositories to unify

database interactions Inversion of Control and dependency Injection Using DependencyResolver

The Repository Pattern

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно The Repository Pattern

The repository pattern wraps the access to data stores (like databases, XML, services…) Exposes only interfaces to interact

with a data store Used for higher code-reusability

and testability The app's business layer contains a single instance of a repository Used to perform CRUD operations

over the data store

The Repository Pattern: Example

public interface IRepository<T>{ T Add(T item); IEnumerable<T> GetAll(); …}

public interface IPlacesRepository : IRepository<PlaceDto>{ }

public class DbPlacesRepository: IPlacesRepository{ public PlaceDto Add(PlaceDto Add){ … } public IEnumerable<PlaceDto> GetAll(){ … } }

The Repository PatternLive Demo

Why These Repositories?

Repository pattern has the f0llowing features: Testability of the application

When the testing of the repositories is done, they can be mocked to test the business layer

Reusability or the repositories When creating a new business layer

working with the same Database (like admin panel)

Extensibility of the business layer In need of more repositories, they

can be easily produced

Repository Pattern in WebAPI

To use the repository pattern in WebAPI just create an instance of the IRepository<T> interface inside the controller And use the repository to interact

with the DBpublic class PlacesController : ApiController{ private IPlacesRepository repository; public PlacesController() { this.repository = new DbPlacesRepository(); } public IEnumerable<PlaceDto> GetAll() { return this.repository.GetAll(); }}

Repository Pattern in WebAPI (2)

Yet in the example the controller instantiates the repository The controller is tightly coupled

with the DbPlacesRepository class This can be fixed using Inversion of

Control and Dependency Injection

Live Demo

Inversion of Control (IoC)

Inversion of Control is a way to loosen the coupling between components Makes testing easier Makes extensibility easier

IoC is a technique that allows coupling of objects at run time, instead of compile time IoC gives objects the dependencies

they need If the controller expects an instance of the IRepository<PlaceDto> interface, the IoC gives it a suitable instance

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно IoC Implementations

There are many ways to implement IoC: Factory design pattern Service locator pattern Dependency injection Template method design pattern Strategy design pattern Etc…

WebAPI has built-in dependency injection for controllers

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно Dependency Injection

Dependency injection removes the hard-coded dependencies between objects and allows changing them run time

The primary idea behind DI is selection of single implementation of interface between many present Decide run time which of the many

implementations of IRepository<PlaceDto> to use for the controller

Dependency Injection in WebAPI

WebAPI has by default a dependency injector for controllers, called DependencyResolver Instantiates controllers with their

default constructor Yet this can be changed to

instantiate another constructor Each WebAPI application has a DependecyResolver, deciding how to initialize controllers

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно DependencyResolver

The dependency resolver of a WebAPI app can be changed with a custom implementation Create a class that inherits from IDependencyResolver and implement its GetService() method:public class DbDependencyResolver: IDependencyResolver

{ static IRepository<Place> placesRep = new DbPlacesRepository(); public object GetService(Type serviceType) { if (serviceType == typeof(PlacesController)) return new PlacesController(placesRepository); else return null; } …}

Inversion of Control (IoC)Live Demo

Application Layers

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно Application Layers

A server application is build from three layers A data layer contains

Access to the data source (database, XML, etc…)

EntityFramework DbContext, XDocument, etc…

A repositories layer contains Repositories with CRUD operations over

a DB A service layer contains

A reference to a repositories layer A reference to the data layer Controllers with actions for a REST API

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно Application Layers

The Data Source

Data Layer Repositories

Services Layer(Business layer)

MS SQL, MySQL, XML, Web services

Entity Framework, OpenAccess, Linq-to-XML

WebAPI controllers

The Places DatabaseCreating a Sample Application

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно The Places Database

Develop an application to store places of interest Each place has coordinates, name, a

set of categories and optional description

Every user can leave a comment or vote for a place The user needs to type in their

username No user authentication required

Categories have a name and set of places

The Database

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно The Database

Create a database for the application i.e. using MS SQL Server Create tables, relations, schema,

etc… Create store procedures and

indexes Create everything needed for an

app database

Creating The DatabaseLive Demo

The Data Layer

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно The Data Layer

The data layer contains a way to connect to the database Entity Framework

Database-first or Code-first ADO.NET LINQ-to-SQL LINQ-to-XML Etc…

Creating the Data LayerLive Demo

The Repositories Layer

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно The Repositories Layer

The repository layer exposes repositories to work with the Database Using the Repository Pattern

The repositories introduce methods to perform CRUD operations over the data store In our case over the Places

database

Creating the Repositories

LayerLive Demo

The Services Layer

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно The Services Layer

The Services layer is the layer that contains the business logic It uses the repositories for data

interactions Yet has no direct dependency over

the data store The Services layer contains all the controllers that are used by the Service Consumer Handles computing and error

handling

Николай Костов - блог за програмиранеC# курс, програмиране, безплатно The Services Layer

The Services Layer is the place where ASP.NET WebAPI steps in It is the only layer that is

dependent to the WebAPI framework

The Services layers uses the repositories to interact with the Data store and WebAPI to communicate with the Consumers Each controller has a repository

instance for data store interactions The repository instances are received

by IoC

?? ? ?

Questions?

Building Server Apps with WebAPI

Building Server Applications with SOA and WebAPI

Documents

Transcript of Building Server Applications with SOA and WebAPI

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