What is factory mode
Factory pattern is one of the most commonly used design patterns , It belongs to creation mode .
somewhat ：
- decoupling , You can separate the creation of objects from the process
- Reduce the amount of code , Easy to maintain
When to use ？
When an abstract class has multiple implementations , When multiple instantiations are required , Consider using the factory model .
such as ： Login abstract class ILoginBusiness, It has 2 Implementation , A login with user name and password , A login with a mobile phone number verification code
public interface ILoginBusiness
{
Task Login(LoginInputDTO input);
}
public class MobileCodeLogin : ILoginBusiness
{
public Task Login(LoginInputDTO input)
{
// todo
}
}
public class UserNameAndPasswordLogin : ILoginBusiness
{
public Task Login(LoginInputDTO input)
{
// todo
}
}
In the same way , We will instantiate according to certain conditions , such as loginType
ILoginBusiness loginBusiness;
if (loginType == 1)
{
loginBusiness = new MobileCodeLogin();
}
else
{
loginBusiness = new UserNameAndPasswordLogin()
}
When there are multiple instances , More is needed ifelse perhaps switch, The function of the factory pattern is to put this method of building objects in the factory class to solve , Unified management and maintenance .
Realization way
public interface ILoginFactory
{
ILoginBusiness Create(LoginInputDTO inputDto);
}
public class LoginFactory : BaseBusiness, ILoginFactory, ITransientDependency
{
public ILoginBusiness Create(LoginInputDTO inputDto)
{
return inputDto.LoginType == LoginType.UserNameAndPwd
? AppDependencyResolver.Current.GetService<UserNameAndPwdLogin>()
: (ILoginBusiness)AppDependencyResolver.Current.GetService<MobileCodeLogin>();
}
public LoginFactory(IRepository repository) : base(repository)
{
}
}
If you use new To instantiate , You need to add the parameters in the constructor to the factory constructor , So here's one AppDependencyResolver, there AppDependencyResolver.Current.GetService<T> It's from the present IOC Get the injected instance in the container , So before MobileCodeLogin and UserNameAndPasswordLogin It needs to be injected into IOC In the example , In our project, it is inheritance ITransientDependency
public class AppDependencyResolver
{
private static AppDependencyResolver _resolver;
public static AppDependencyResolver Current
{
get
{
if (_resolver == null)
throw new Exception("AppDependencyResolver not initialized");
return _resolver;
}
}
// stay startUp Of ConfigureService Last , Join in AppDependencyResolver.Init(services.BuildServiceProvider());
public static void Init(IServiceProvider service)
{
_resolver = new AppDependencyResolver(service);
}
private AppDependencyResolver(IServiceProvider serviceProvider)
{
_serviceProvider = serviceProvider;
}
private readonly IServiceProvider _serviceProvider;
public object GetService(Type serviceType)
{
return _serviceProvider.GetService(serviceType);
}
public T GetService<T>()
{
return _serviceProvider.GetService<T>();
}
}
About the unit measurement of the factory
About the factory , We just need to test whether the returned object is what we need , As for the execution of the object, you don't need to care
[Theory(DisplayName = " Test login factory ")]
[InlineData(LoginType.MobileCode, typeof(MobileCodeLogin))]
[InlineData(LoginType.UserNameAndPwd, typeof(UserNameAndPwdLogin))]
public void CreateTests(LoginType loginType, Type expectedType)
{
Mock<IRepository> mock = new Mock<IRepository>();
ILoginFactory factory = new LoginFactory(mock.Object);
var login = factory.Create(new LoginInputDTO()
{
LoginType = loginType
});
Assert.IsType(expectedType, login);
}
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