locking - managing lock on masssage in rabbit mq -

i'm trying use rabbitmq in more unconventional way (though @ point can pick other message queue implementation if needed)

my application working , have 1 queue (i can have more if needed) mant customers fetching n messages asynchronous. after work send results client db.

i have 2 problems: first dont want work on same message, second want grantee wont lose messages in case customer close browser or stop working.

i looked @ documentation , saw ttl perfect me if alter message got timeout isn't going deleted move queue. can't find way alter this.

moreover looked @ confirmation option in first glance looked wanted,that mechanism working this: when consumer gets message send confirmation queue, thought can delay confirm , send when work done on client side. problem can't program queue if message didnt confirm return queue (or another).

i find how scheduled message didn't either because don't want message inserted queue in 5 min,i want when customer receive message locked in queue 5 min until confirm delete set otherwise return queue.

can temporary queue enables mechanism?

if can 1 of problems or suggest architecture or option in mq great.

resources:

confirmation: http://www.rabbitmq.com/blog/2011/02/10/introducing-publisher-confirms/

post locks problem batcher component: locks , batch fetch messages rabbitmq

ttl: https://www.rabbitmq.com/ttl.html

schedule message: https://www.rabbitmq.com/blog/2015/04/16/scheduling-messages-with-rabbitmq/

my problem can't program queue if message didnt confirm return queue (or another).

rabbitmq anyhow, have switch off auto-ack flag, figured out

i thought can delay confirm , send when work done on client side.

so send ack once you've finished processing message. unacknowledged messages remain in queue , re-delivered next consumer (or same 1 when it's again, depending on setup)