Possibility to retrieve a job position in queue

[AlexMog]

Is your feature request related to a problem? Please describe.
I need to have access to jobs position in the queue using their id and the queue current size

Describe the solution you'd like
It would be great to have methods to provide an efficient way to retrieve the current position of a job in the queue and the current size of the queue

Describe alternatives you've considered
I've already considered to call directly redis using the repository, but I haven't found an efficient way to retrieve the position of the job

Thanks !

[sonus21]

Hi Alex
Why would like to know job position in the rqueue? There's no straight forward, it will be O(n) operation :(

[AlexMog]

Hey Sonus,
I am using rqueue for user-provided content execution, so it's important for me to provide position feedback for the users so they can estimate the time that the task will take.
I'm aware that the most probable output will have O(n) complexity, but I can't find another way to provide this kind of feedback to the user !
(The user should be able to see "Current position: CURRENT_POS / QUEUE_SIZE" as a feedback on our front)

[sonus21]

Are you enqueuing delayed job or simple job? For simple job we can try to get the position when the element was added in the queue.
BTW these jobs are in append mode so getting at the enqueue time is easy but query would be killer. One thing you can try is attach a counter and decrement that counter post successful execution, but you need to decrement count for all pending jobs :(

[AlexMog]

Simple jobs, it would be a nice start to have the position on add, but if you can add the retrieval of the position at any time, it would be event greater ^^

Thanks in each case !

[sonus21]

How accurate do you expect this data?

This data can not be accurate due to two reasons, you don't know about

• scheduled jobs or jobs those meant to retry later
• Jobs currently being processed

If you are fine with these inaccuracy you can try to get list size like it's done for metrics

rqueue/rqueue-core/src/main/java/com/github/sonus21/rqueue/metrics/RqueueMetrics.java

Line 57 in 6ba371f

val = rqueueMessageTemplate.getListSize(name);

Post enqueue you need to get QueueDetail from QueueRegistry/EndpointRegistry, once you have queue detail you can call lLen method of RedisTemplate queue name would be QueueDetail#getQueueName().

[AlexMog]

It is not expected to be accurate, it's just to give an approximation for the users on their wait time :)

I'll try your solution, thanks !