DotNetBrightener.Plugins.EventPubSub.AzureServiceBus 2024.0.14.6-preview-2381603

Azure Service Bus Enabled for Event PubSub Library

© 2024 DotNet Brightener

Versions

Library	Version
EventPubSub Core
Azure Service Bus Library
Dependency Injection Library

Installation

dotnet package add DotNetBrightener.Plugins.EventPubSub
dotnet package add DotNetBrightener.Plugins.EventPubSub.DependencyInjection
dotnet package add DotNetBrightener.Plugins.EventPubSub.AzureServiceBus

Usage

Configuration

Option 1: Use IConfiguration to configure the service bus

builder.Services
        // Initialize EventPubSubService
       .AddEventPubSubService(
                              Assembly.GetExecutingAssembly(),
                              // assemblies where the event messages are defined
                              typeof(DistributedTestMessage).Assembly
                             )
        // Add Azure Service Bus
       .AddAzureServiceBus(builder.Configuration)
        // Add event handlers
       .AddEventHandlersFromAssemblies([
            Assembly.GetExecutingAssembly(),
            // assemblies where the event handlers are defined
        ]);

In your appsettings.json file, add the the following configuration:

"ServiceBusConfiguration": {
    "ConnectionString": "<connection_string_to_Azure_Service_Bus",
    "SubscriptionName": "<your_app_name>"
} 

Option 2: Configure from code

builder.Services
        // Initialize EventPubSubService
       .AddEventPubSubService(
                              Assembly.GetExecutingAssembly(),
                              // assemblies where the event messages are defined
                              typeof(DistributedTestMessage).Assembly
                             )
        // Add Azure Service Bus
       .AddAzureServiceBus("<connection_string_to_Azure_Service_Bus>",
                           "<your_app_name>")
        // Add event handlers
       .AddEventHandlersFromAssemblies([
            Assembly.GetExecutingAssembly(),
            // assemblies where the event handlers are defined
        ]);

Default Configuration Value

If you use appsettings.json to configure the service bus, you can also customize the following configuration values by adding it to the JSON:

Event Message Definition

Create a class that represents the event message. The class must implement the IDistributedEventMessage interface.

namespace YourProject.NameSpace;

public class DistributedTestMessage : IDistributedEventMessage
{
    public string Name { get; set; }

    // more payload properties
}

Event Handler Definition

Create a class derived from DistributedEventEventHandler<YourEventMessage> and override HandleEvent method to handle the event message.

With this implementation, you'll be able to access the original payload of the messsage by accessing OriginPayload property.

public class TestEventHandlerDistributed(ILogger<TestEventHandlerDistributed> logger)
    : DistributedEventEventHandler<DistributedTestMessage>
{
    private readonly ILogger _logger = logger;
    
    public override Task<bool> HandleEvent(DistributedTestMessage eventMessage)
    {
        // access the `OriginPayload` 
        var origin = OriginPayload;

        _logger.LogInformation($"Received message: {eventMessage.Name}");

        return Task.FromResult<bool>(true);
    }
}