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https://github.com/gokgokalp/metrobus
Lightweight messaging wrapper of MassTransit
https://github.com/gokgokalp/metrobus
consumer dotnet dotnet-core dotnetcore masstransit message-bus messaging rabbitmq service-bus
Last synced: 3 months ago
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Lightweight messaging wrapper of MassTransit
- Host: GitHub
- URL: https://github.com/gokgokalp/metrobus
- Owner: GokGokalp
- License: mit
- Created: 2017-02-13T14:34:30.000Z (almost 8 years ago)
- Default Branch: master
- Last Pushed: 2020-10-28T19:57:46.000Z (over 4 years ago)
- Last Synced: 2024-05-28T19:39:26.089Z (8 months ago)
- Topics: consumer, dotnet, dotnet-core, dotnetcore, masstransit, message-bus, messaging, rabbitmq, service-bus
- Language: C#
- Size: 69.3 KB
- Stars: 72
- Watchers: 6
- Forks: 22
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# **MetroBus**
------------------------------
Lightweight messaging wrapper of _MassTransit_
[](https://badge.fury.io/nu/MetroBus)
[](https://badge.fury.io/nu/MetroBus.Core)
[](https://badge.fury.io/nu/MetroBus.Autofac)
[](https://badge.fury.io/nu/MetroBus.Microsoft.Extensions.DependencyInjection)
### NuGet Packages
```
> dotnet add package MetroBus
> dotnet add package MetroBus.Autofac
> dotnet add package MetroBus.Microsoft.Extensions.DependencyInjection
```
#### Supports:
- .NET Standard 2.0
#### Features:
- Currently only supports RabbitMQ transport
- Provides easy way to create **Producer** and **Consumer** for Pub/Sub
- Provides easy way to handle **Request/Response** conversations
- Provides message scheduling
- Includes optional incremental auto retry policy
- Includes optional circuit breaker
- Includes optional rate limiter
- Autofac support
- Microsoft.Extensions.DependencyInjection support
Usage:
-----
Initializing bus instance for **Producer**:
```cs
// For events
IBusControl bus = MetroBusInitializer.Instance.UseRabbitMq(rabbitMqUri, rabbitMqUserName, rabbitMqPassword)
.InitializeEventProducer();
// For commands
ISendEndpoint bus = MetroBusInitializer.Instance.UseRabbitMq(rabbitMqUri, rabbitMqUserName, rabbitMqPassword)
.InitializeCommandProducer(queueName);
```
after bus instance initializing then you can use _Send_ or _Publish_ methods.
```cs
// For events
await bus.Publish(new
{
SomeProperty = SomeValue
}));
// For commands
await bus.Send(new
{
SomeProperty = SomeValue
}));
```
using **Consumer**:
```cs
static void Main(string[] args)
{
IBusControl bus = MetroBusInitializer.Instance
.UseRabbitMq(string rabbitMqUri, string rabbitMqUserName, string rabbitMqPassword)
.RegisterConsumer(string queueName)
.RegisterConsumer(string queueName)
.Build();
bus.Start();
//if you want to stop
bus.Stop();
Console.ReadLine();
}
```
_TCommandConsumer_ could like below:
```cs
public class TCommandConsumer : IConsumer
{
public async Task Consume(ConsumeContext context)
{
var command = context.Message;
//do something...
await Console.Out.WriteAsync($"{command.SomeProperty}");
}
}
```
Initializing bus instance for Request/Response conversation:
```cs
IRequestClient client = MetroBusInitializer.Instance.UseRabbitMq(string rabbitMqUri, string rabbitMqUserName, string rabbitMqPassword)
.InitializeRequestClient(string queueName);
TResponse result = await client.Request(new TRequest
{
Command = "Say hello!"
});
```
and consumer for Request/Response conversation could like below:
```cs
public class TCommandConsumer : IConsumer
{
public async Task Consume(ConsumeContext context)
{
var command = context.Message;
//do something...
await Console.Out.WriteAsync($"{command.SomeProperty}");
//and
context.Respond(new TRequest
{
Command = "Hello!"
});
}
}
```
using **Consumer** with Microsoft.Extensions.DependencyInjection:
```cs
new HostBuilder ()
.ConfigureServices ((hostContext, services) =>
{
services.AddMetroBus (x =>
{
x.AddConsumer();
x.AddConsumer();
});
services.AddSingleton (provider => MetroBusInitializer.Instance
.UseRabbitMq (string rabbitMqUri, string rabbitMqUserName, string rabbitMqPassword)
.RegisterConsumer("foo.command.queue", provider)
.RegisterConsumer("foo.event.queue", provider)
.Build ())
.BuildServiceProvider ();
services.AddHostedService ();
})
.RunConsoleAsync ().Wait ();
public class BusService : IHostedService
{
private readonly IBusControl _busControl;
public BusService(IBusControl busControl)
{
_busControl = busControl;
}
public Task StartAsync(CancellationToken cancellationToken)
{
return _busControl.StartAsync(cancellationToken);
}
public Task StopAsync(CancellationToken cancellationToken)
{
return _busControl.StopAsync(cancellationToken);
}
}
```
**PS**: **Publisher** and **Consumer** services must be used same _TCommand_ or _TEvent_ interfaces. This is important for MassTransit integration. Also one other thing is _rabbitMqUri_ parameter must start with "rabbitmq://" prefix.
There are several options you can set via fluent interface:
- `.UseRetryPolicy().UseIncrementalRetryPolicy(int retryLimit, TimeSpan? initialIntervalTime, TimeSpan? intervalIncrementTime, params Exception[] retryOnSpecificExceptionType).Then()`
- `.UseCircuitBreaker(int tripThreshold, int activeThreshold, TimeSpan? resetInterval)`
- `.UseRateLimiter(int rateLimit, TimeSpan? interval)`
- `.UseMessageScheduler()`
- `.UseDelayedExchangeMessageScheduler()`
- `.UseConcurrentConsumerLimit(int concurrencyLimit)`