Do NIO selectors use event notifications by default?

StackOverflow https://stackoverflow.com/questions/7916324

  •  14-02-2021
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Question

I found this article saying OpenJDK uses epoll on linux, but does anybody know if Selector implementations use kqueue, dev/poll etc over traditional polling where available?

Was it helpful?

Solution

Yes it does. java.nio.channels.Selector.open() returns different implementations depending on your underlying operating system. Eg. If you are using a JRE from sun/oracle you will get:

Windows 
sun.nio.ch.WindowsSelectorImpl

Mac OS 
sun.nio.ch.KQueueSelectorImpl

Linux 
sun.nio.ch.EPollSelectorImpl

Solaris
sun.nio.ch.PollSelectorImpl
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