I have two consumer on different queues in C# using RabbitMQ dot net library.
What i want:
Because of some business logic, I have to wait for some time in one consumer so i have used Thread.Sleep()
for that purpose
Problem
if I use Thread.Sleep
in one event the second thread is also not paused
My code:
consumer.Received += (model, ea) =>
{
try
{
DRModel drModel = JsonConvert.DeserializeObject<DRModel>(Encoding.UTF8.GetString(ea.Body));
RMQReturnType type = ProcessSubmitSMS(drModel);
if (type == RMQReturnType.ACK)
channel.BasicAck(ea.DeliveryTag, false);
else
{
channel.BasicNack(ea.DeliveryTag, false, true);
Thread.Sleep(300000); // <=== SLEEP
}
}
catch (Exception ex)
{
channel.BasicNack(ea.DeliveryTag, false, true);
WriteLog(ControlChoice.ListError, "Exception: " + ex.Message + " | Stack Trace: " + ex.StackTrace.ToString() + " | [Consumer Event]");
}
};
It seems it is a good case for Mutex class, what you need is a conditional sleep in multithreading. Don't know exactly the logic that you need, but thy something like the code below:
public class Consumer
{
public event EventHandler Received;
public virtual void OnReceived()
{
Received?.Invoke(this, EventArgs.Empty);
}
}
class Program
{
static void Main(string[] args)
{
var mutex = new Mutex();
var consumer = new Consumer();
consumer.Received += (model, ea) =>
{
try
{
mutex.WaitOne();
var id = Guid.NewGuid().ToString();
Console.WriteLine($"Start mutex {id}");
Console.WriteLine($"Mutex finished {id}");
Console.WriteLine($"Start sleep {id}");
if ( new Random().Next(10000) % 2 == 0) // randomly sleep, that your condition
{
Thread.Sleep(3000); // <=== SLEEP
}
Console.WriteLine($"Sleep finished {id}");
}
catch (Exception ex)
{
mutex.ReleaseMutex(); // this is where you release, if something goes wrong
}
finally
{
mutex.ReleaseMutex();// always release it
}
};
Parallel.For(0, 10, t => //running 10 threads in parallel and stops all if the condition is true
{
consumer.OnReceived();
});
Console.ReadLine();
}
}
}
there is some logical error in my code whcih i understand. In rabbitmq i have created two consumer events on two different channels so i thought it will not be shared here i was wrong a connection was shared b/w channels so i explicly defin two connection for that. as i understand consumer block channel and channel block connection and connection is same in both events.
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