Can i choose in with server my job is execute?

question
1

In my dev environment, i need add and execute a job in a specific server, because i has 2 ou 3 developer using the same server but job was execute in inapropiated machine.
How i do this?

2

I’ve had the same issue. First, I’ve tried specifying the queue name at runtime (adding machine name to the queue name) when adding a job - the problem with that solution was, that retries always went to the default queue.
Now, I’ve added my own JobFilterAttribute implementation (actually just a minor variation from QueueAttribute):

    public class DynamicQueueAttribute : JobFilterAttribute, IElectStateFilter
    {
        public DynamicQueueAttribute(string queue)
        {
            Queue = queue;
        }

        public string Queue { get; private set; }

        public void OnStateElection(ElectStateContext context)
        {
            var enqueuedState = context.CandidateState as EnqueuedState;
            if (enqueuedState != null)
            {
                enqueuedState.Queue = AppendMachineNameIfDebug(Queue);
            }
        }

        private string AppendMachineNameIfDebug(string queueName)
        {
#if DEBUG
            queueName = string.Format("{0}_{1}", queueName, System.Environment.MachineName.ToLowerInvariant());
#endif
            return queueName;
        }
    }

Instead of using [Queue(“somequeue”)], I’m now simply using [DynamicQueue(“somequeue”)] on the job interface.
Of course, you need to specify the appropriate queue name (including the _) when setting up the server and you should not deploy a debug build to production…

If someone has another idea how to solve this, I’d be interested to hear it, too.

3

Hi Dusty, thank you for help.
My solution is more simple (and need manual intervention)

var env = ConfigurationManager.AppSettings.Get(“env”);
var backgroundServerOptions = new BackgroundJobServerOptions();
if (env.Equals(Constants.Env.Debug))
{
backgroundServerOptions = new BackgroundJobServerOptions
{
//Queues = new {Environment.MachineName.ToLower(), “default”}
Queues = new { Environment.MachineName.ToLower()}
};
}
app.UseHangfireServer(backgroundServerOptions);

And i use [Queue(“mymachinenameinlowercase”)] in all class that i need develop.

I dont undestand your example to use customized queue class, because I cant anotate my class with dynamic name of queue.

s

4

Well, if you can annotate your class with [Queue(“queuename”)], why can’t you annotate it with a custom attribute [DynamicQueue(“queuename”)] instead?
If you do that, the name of the queue will be queuename_ if you’re running a debug build and just ‘queuename’ if it’s no debug build.
You can add the same AppendMachineNameIfDebug function for the server setup:

backgroundServerOptions = new BackgroundJobServerOptions
    {
        Queues = new[] { AppendMachineNameIfDebug("default")}
    };

The DynamicQueueAttribute class is simply a replacement for the standard QueueAttribute of hangfire.

5

Now i undestand, thank you! I will try your solution.