DistributedMutexUsage.cs

async Task Main()
{
	// Name of the tool.
	const string toolName = "ImportTool";
	
		
	// Simulate a job that runs for 2 minutes.
	var job = new Task(() => {
		 Thread.Sleep(TimeSpan.FromMinutes(2));
	});
	

	// Prevent multiple instances of this job from running at the same time.
	var mutex = new DistributedMutex(ConfigurationManager.AppSettings["StorageConnectionString"],
									 ConfigurationManager.AppSettings["StorageContainerName"],
									 toolName);

    // Obtain lock before job starts.
	// This will throw exceptions if another job is running.
	await mutex.AcquireAsync();
	
	// Start the job now. 
	job.Start();
	
	Console.WriteLine($"{toolName} is running...");

	// Renew the lease every 55 seconds before it expires at 60 seconds.
	var timer = new System.Timers.Timer(55000);

	timer.Elapsed += async (sender, e) => {
		try {
			// Has the job finished?
			// Finished means one of three final states: RanToCompletion, Faulted, or Canceled.
			if (job.IsCompleted) {

				// Try to release lock silently.				
				try {
					await mutex.ReleaseAsync();
				}
				catch {}

				timer.Dispose();
			}
			else {
				// Renew the lease.
				await mutex.RenewAsync();
			}
		}
		catch (Exception ex) {
			//logger.Error(ex, $"Error while renewing the lease for account {key}.");
			Console.WriteLine(ex.Message);
		}
	};

	// Start timer.	
	timer.Start();
	
	// Wait for job to finish.
	await job.ConfigureAwait(false);

	Console.WriteLine($"{toolName} job finished.");

	// Release lock immediately so another instance can get launched.
	try {
		await mutex.ReleaseAsync();
	}
	catch {}


}