What is it

NPatterns is a collection of patterns often used in .NET projects, such as patterns of eaa.

How to get it

• from github
• from nuget: by searching the Name "NPatterns"

Assemblies

• NPatterns: defines the contracts of patterns, like interface, base class, and basic implementations without any other dependencies.
• NPatterns.XXX: implement some patterns with specified dependencies.

Patterns implemented:

MessageBus (a.k.a EventBus)

NPatterns.Messaging.MessageBus, NPatterns

1. without Hanlder Factory

1.1. define a message

public class UserCreatedEvent //UserName,Email etc;

1.2. initial a bus

you could keep it as Singleton, so it could handle all messages in your application via registered handlers

public static IMessageBus Bus = new MessageBus();

1.3. register handler

you may keep the disposer if the disposing needed sometime

var disposer = Bus.Subscribe<UserCreatedEvent>(m=>{
    //log for m.UserName
    //send welcome mail to m.Email
});

1.4. publish message

then registered handler of previous step would be invoked

var aMessage=new UserCreatedEvent{UserName="abc",Email="abc@abc.com"};
Bus.Publish<UserCreatedEvent>(aMessage);

2. with Hanlder Factory

2.1. define a message (as same as above)

2.2. initial a bus with handler factory

kernel.Bind<IMessageBus>() //Ninject
  .ToConstructor(ctorArg => new MessageBus(type => ctorArg.Context.Kernel.GetAll(type))) //setup handler factory
  .InSingletonScope(); //make it singleton

2.3. implement a Hanlder

public class UserCreatedEventHandler:IHandler<UserCreatedEvent>
{
    public void Handle(UserCreatedEvent message)
    {
        //log for message.UserName
        //send welcome mail to message.Email
    }
}

2.4. IoC configuration

kernel.Bind<IHandler<UserCreatedEvent>>().To<UserCreatedEventHandler>(); //Ninject

2.5. publish message (as same as above)

UnitOfWork

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Repository

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QueryObject

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