Azure Service Bus
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Description
It is a message broker with message queues and publish-subscribe topics.
| Name | Description |
|---|---|
| Queue | Allows for Sending and Receiving of messages. Often used for point-to-point communication. |
| Topic | As opposed to Queues, Topics are better suited to publish/subscribe scenarios. A topic can be sent to, but requires a subscription, of which there can be multiple in parallel, to consume from. |
| Subscription | The mechanism to consume from a Topic. Each subscription is independent, and receives a copy of each message sent to the topic. Rules and Filters can be used to tailor which messages are received by a specific subscription. |
Configure the service bus on Azure
- Azure portal → Service Bus → Add
- Create namespace: the namespace will be the url use by the service bus
- Once deployed, go to the newly create service bus namespace → add queue
Sender
Add Nuget package Azure.Messaging.ServiceBus
| Program.cs |
private const string ConnectionString = "get it from Azure Portal → Service Bus Namespace → Shared access policy → Primary Connection String";
private const string QueueName = "myqueue";
private const string TopicName = "topic1";
static async Task Main(string[] args)
{
var client = new ServiceBusClient(ConnectionString);
try // use await using in C# 8 / .Net Core
{
var sender = client.CreateSender(QueueName);
var sender = client.CreateSender(TopicName);
var message = new ServiceBusMessage("Hello!");
await sender.SendMessageAsync(message);
Console.WriteLine($"Sent {message.Body}");
}
finally
{
await client.DisposeAsync();
}
}
|
Receiver
Add Nuget package Azure.Messaging.ServiceBus
| Program.cs |
private const string ConnectionString = "get it from Azure Portal → Service Bus Namespace → Shared access policy → Primary Connection String";
private const string QueueName = "myqueue";
private const string TopicName = "topic1";
static async Task Main(string[] args)
{
var client = new ServiceBusClient(ConnectionString);
var processor = client.CreateProcessor(QueueName);
try
{
processor.ProcessMessageAsync += MessageHandler;
processor.ProcessErrorAsync += ErrorHandler;
await processor.StartProcessingAsync();
Console.ReadKey();
}
finally
{
await processor.DisposeAsync();
await client.DisposeAsync();
}
}
static async Task MessageHandler(ProcessMessageEventArgs args)
{
string body = args.Message.Body.ToString();
Console.WriteLine(body);
// we can evaluate application logic and use that to determine how to settle the message.
await args.CompleteMessageAsync(args.Message);
}
static Task ErrorHandler(ProcessErrorEventArgs args)
{
// the error source tells me at what point in the processing an error occurred
Console.WriteLine(args.ErrorSource);
// the fully qualified namespace is available
Console.WriteLine(args.FullyQualifiedNamespace);
// as well as the entity path
Console.WriteLine(args.EntityPath);
Console.WriteLine(args.Exception.ToString());
return Task.CompletedTask;
}
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