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 # CAP
-
-[![Travis](https://travis-ci.org/dotnetcore/CAP.svg?branch=master)](https://travis-ci.org/dotnetcore/CAP)
+[![Travis branch](https://img.shields.io/travis/dotnetcore/CAP/master.svg?label=travis-ci)](https://travis-ci.org/dotnetcore/CAP)
 [![AppVeyor](https://ci.appveyor.com/api/projects/status/4mpe0tbu7n126vyw?svg=true)](https://ci.appveyor.com/project/yuleyule66/cap)
 [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/dotnetcore/CAP/master/LICENSE.txt)
 
-A .net core middleware of eventually consistent in distributed architectures, now developing...
+CAP is a library to achieve eventually consistent in distributed architectures system like SOA,MicroService. 	It is lightweight,easy to use and efficiently.
+
+## OverView
+
+CAP is a library that used in an ASP.NET Core project,Of Course you can ues it in ASP.NET Core with .NET Framework.
+
+You can think of CAP as an EventBus because it has all the features of EventBus, and CAP provides a easier way to handle the publishing and subscribing than EventBus.
+
+CAP has the function of Message Presistence, and it makes messages reliability when your service is restarted or down. CAP provides a Producer Service based on Microsoft DI that integrates seamlessly with your business services and supports strong consistency transactions.
+
+This is a diagram of the CAP working in the ASP.NET Core MicroService architecture:
+
+![](http://images2015.cnblogs.com/blog/250417/201706/250417-20170630143600289-1065294295.png)
+
+> The solid line in the figure represents the user code, and the dotted line represents the internal implementation of the CAP.
+
+## Getting Started
+
+### NuGet (Coming soon)
+
+You can run the following command to install the CAP in your project.
+
+If your Message Queue is using Kafka, you can：
+
+```
+PM> Install-Package DotNetCore.CAP.Kafka
+```
+
+or RabbitMQ：
+
+```
+PM> Install-Package DotNetCore.CAP.RabbitMQ
+```
+
+CAP provides EntityFramework as default database store extension ：
+
+```
+PM> Install-Package DotNetCore.CAP.EntityFrameworkCore
+```
+
+### Configuration
+
+First,You need to config CAP in your Startup.cs：
+
+```cs
+public void ConfigureServices(IServiceCollection services)
+{
+	......
+
+    services.AddDbContext<AppDbContext>();
+
+    services.AddCap()
+            .AddEntityFrameworkStores<AppDbContext>()
+            .AddKafka(x => x.Servers = "localhost:9453");
+}
+
+public void Configure(IApplicationBuilder app)
+{
+	.....
+
+    app.UseCap();
+}
+
+```
+
+### Publish
+
+Inject `ICapProducerService` in your Controller, then use the `ICapProducerService` to send message
+
+```cs
+public class PublishController : Controller
+{
+	private readonly ICapProducerService _producer;
+
+	public PublishController(ICapProducerService producer)
+	{
+		_producer = producer;
+	}
+
+
+	[Route("~/checkAccount")]
+	public async Task<IActionResult> PublishMessage()
+	{
+		//Specifies the message header and content to be sent
+		await _producer.SendAsync("xxx.services.account.check", new Person { Name = "Foo", Age = 11 });
+
+		return Ok();
+	}
+}
+
+```
+
+### Subscribe
+
+**Action Method**
+
+Add Attribute on Action to subscribe message:
+
+If you are using Kafka the Attribute is `[KafkaTopic()]`, and RabbitMQ is  `[RabbitMQTopic()]`
+
+```cs
+public class PublishController : Controller
+{
+	private readonly ICapProducerService _producer;
+
+	public PublishController(ICapProducerService producer)
+	{
+		_producer = producer;
+	}
+
+
+	[NoAction]
+	[KafkaTopic("xxx.services.account.check")]
+	public async Task CheckReceivedMessage(Person person)
+	{
+		Console.WriteLine(person.Name);
+		Console.WriteLine(person.Age);     
+		return Task.CompletedTask;
+	}
+}
+
+```
+
+**Service Method**
+
+If your subscribe method is not in the Controller,then your subscribe class need to Inheritance `IConsumerService`: 
+
+```cs
+
+namespace xxx.Service
+{
+	public interface ISubscriberService
+	{
+		public void CheckReceivedMessage(Person person);
+	}
+
+
+	public class SubscriberService: ISubscriberService, IConsumerService
+	{
+		[KafkaTopic("xxx.services.account.check")]
+		public void CheckReceivedMessage(Person person)
+		{
+			
+		}
+	}
+}
+
+```
+
+Then inject your  `ISubscriberService`  class in Startup.cs 
+
+```cs
+public void ConfigureServices(IServiceCollection services)
+{
+	services.AddTransient<ISubscriberService,SubscriberService>();
+}
+```
 
-### Contribute
+## Contribute
 
 One of the easiest ways to contribute is to participate in discussions and discuss issues. You can also contribute by submitting pull requests with code changes.
 
 ### License
 
-MIT
+[MIT](https://github.com/dotnetcore/CAP/blob/master/LICENSE.txt)