CODEWITHSUNDEEP
javaselectblockingqueue
Rafael Marmelo
Rafael Marmelo

Reputation: 83

Reading from multiple BlockingQueues within a single thread

I have three Java's LinkedBlockingQueue instances and I'd like to read from them (take operation) only using one thread. The naive approach is to have one thread per queue.

Is there anything like the UNIX select system call for blocking queues in Java?

Thanks.

Upvotes: 3

Views: 1198

Answers (1)

Carl Smotricz
Carl Smotricz

Reputation: 67760

Well, those BlockingQueues were really meant to be serviced by their own Threads.

Something I'd consider trying is to set up a 4th queue for much smaller items, say Booleans, and have the offer() calls on each of the 3 other queues accompany their insertion by inserting a Boolean into that 4th queue. Your thread can then go to sleep on the 4th queue, and when it wakes up it can peek() in the other 3 to find out where to get the goods.

Highly inelegant solution, I think, and I suspect there are possible race conditions where you won't be cleanly woken up some times. But it should basically work.

Upvotes: 2

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