c# - Azure ServiceBus MessageSender 类在长期进程中作为单例运行是否安全？

Question

我有一个长时间运行的进程，它会唤醒、执行某些任务，并且可能需要也可能不需要通过 MessageSender 将消息发布到 Azure 服务总线。如果我可以使 MessageSender 成为单例，这会稍微简化我的代码，所以我希望它是否可行。

为了澄清，我预计这个过程可能会持续很长一段时间(至少几个小时，可能几天)而不向服务总线发送任何消息。

super 简化的示例:

public async Task WorkLoop(CancellationToken token)
{
    while (!token.IsCancellationRequested)
    {
        var result = DoWork();
        if (result.shouldPublish)
        {
            var message = buildMessage(result);
            await _messageSender.SendAsync(message);
        }
        await Task.Delay(sleepDuration, token);
    }
}

让 MessageSender 实例长时间(至少几天，可能几周或几个月)保持事件状态是否会产生任何后果？

Answer 1

根据Best Practices for performance improvements using Service Bus Messaging :

It is recommended that you do not close messaging factories or queue, topic, and subscription clients after you send a message, and then re-create them when you send the next message. [...] You can safely use these client objects for concurrent asynchronous operations and from multiple threads.