Replacing Microsoft.Azure.ServiceBus with Azure.Messaging.ServiceBus

Question

I have a message publisher that uses Microsoft.Azure.ServiceBus and need to replace it with Azure.Messaging.ServiceBus as it is now deprecated.

Here is the code:

using Microsoft.Azure.ServiceBus;
using Newtonsoft.Json;
using System;
using System.Text;
using System.Threading.Tasks;

namespace gbx.infra.ware.Services
{
public interface IMessagePublisher
{
    public Task Publish<T>(T obj);
    public Task Publish(string raw);
    public Task<long> PublishScheduled<T>(T obj, DateTimeOffset time);

}
public class MessagePublisher : IMessagePublisher
{
    private readonly ITopicClient _topicClient;

    public MessagePublisher(ITopicClient topicClient)
    {
        _topicClient = topicClient;
    }

    public Task Publish<T>(T obj)
    {
        string objAsText = JsonConvert.SerializeObject(obj);

        Message message = new Message(Encoding.UTF8.GetBytes(objAsText));
        message.UserProperties["messageType"] = typeof(T).Name;
        return _topicClient.SendAsync(message);
    }

    public Task Publish(string raw)
    {
        Message message = new Message(Encoding.UTF8.GetBytes(raw));
        message.UserProperties["messageType"] = "Raw";
        return _topicClient.SendAsync(message);
    }

    public Task<long> PublishScheduled<T>(T obj, DateTimeOffset time)
    {
        string objAsText = JsonConvert.SerializeObject(obj);

        Message message = new Message(Encoding.UTF8.GetBytes(objAsText));
        message.UserProperties["messageType"] = typeof(T).Name;
        return _topicClient.ScheduleMessageAsync(message, time);
    }
    }
    }

Is there a simple way i can make the change? I can't find any info on this.

The publisher is registered like this:

services.AddSingleton<ITopicClient>(x => new TopicClient(Configuration["ServiceBus:ConnectionString"], Configuration["ServiceBus:TopicName"]));
services.AddSingleton<IMessagePublisher, MessagePublisher>();

And injected into as needed.

What i want to do is to change the code in the Message Publisher only so that no changes need to be done in the code where it is used.

Answer 1

If you would simply use the migration guide you would end up with

public interface IMessagePublisher
{
    public Task Publish<T>(T obj);
    public Task Publish(string raw);
    public Task<long> PublishScheduled<T>(T obj, DateTimeOffset time);

}

public class MessagePublisher : IMessagePublisher
{
    private readonly ServiceBusSender _serviceBusSender;

    public MessagePublisher(ServiceBusSender serviceBusSender)
    {
        _serviceBusSender = serviceBusSender;
    }

    public Task Publish<T>(T obj)
    {
        string objAsText = JsonConvert.SerializeObject(obj);

        ServiceBusMessage message = new ServiceBusMessage(Encoding.UTF8.GetBytes(objAsText));
        message.ApplicationProperties["messageType"] = typeof(T).Name;
        return _serviceBusSender.SendMessageAsync(message);
    }

    public Task Publish(string raw)
    {
        ServiceBusMessage message = new ServiceBusMessage(Encoding.UTF8.GetBytes(raw));
        message.ApplicationProperties["messageType"] = "Raw";
        return _serviceBusSender.SendMessageAsync(message);
    }

    public Task<long> PublishScheduled<T>(T obj, DateTimeOffset time)
    {
        string objAsText = JsonConvert.SerializeObject(obj);

        ServiceBusMessage message = new ServiceBusMessage(Encoding.UTF8.GetBytes(objAsText));
        message.ApplicationProperties["messageType"] = typeof(T).Name;
        return _serviceBusSender.ScheduleMessageAsync(message, time);
    }
}

To register the MessagePublisher try:

services.AddSingleton<IMessagePublisher>(p => 
        new MessagePublisher(
        new ServiceBusClient(Configuration["ServiceBus:ConnectionString"]).CreateSender(Configuration["ServiceBus:TopicName"])));

Note: there are other ways to register the message publisher, see How to register ServiceBusClient for dependency injection? . You might need some minor modifications of MessagePublisher though.