Asycronous IO in java ? ? ?
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Having 10000 TCP/IP connections open at some time
Hi all
I need to have a server managing allot of connection in simultaneous. Having a thread for each connection is out of question.
So how do I do this in just one Thread managing all the connections?
Something like the POSIX select command
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Answers
In my experience, if you want something like select, you'll have to write it yourself. Have a master thread controlling incoming connections and a multiplexing controller that polls connectiong for read/write ready states.
You might find this page useful: http://www.developer.com/n
You don't have to sleep with the multiplexor concept, you can ahve the multiplexor constantly going through a list of connections polling them.
You can have a separate pair of threads for read and write respectively. NB: this requires some shared memory vodoo!
e.g.
// multiplexor
for(int i = 0; i < connections.length; i++){
//poll connection[i] for read
readyToRead[i] = true;
//poll connection[i] for write
readyToWrite[i] = true;
}
//read loop
for(int i = 0; i < connections.length; i++){
if (readyToRead[i])
// do read action
}
//write loop
for(int i = 0; i < connections.length; i++){
if (readyToWrite[i])
// do write action
}
true - it does use CPU continuously, the only fix to that would be to add a delay to the multiplexor and have it signal when action needs to be taken. Use signal listerners in each of the children's threads so that they may sleep when nothing needs doing. But point well taken, the solution I offered uses up CPU needlessly.
You can look at non-blocking IO
http://www.exampledepot.co
Have you looked into the Grizzly server?
https://grizzly.dev.java.n
Grizzly 2.0 is out now, and some examples are coming out:
http://blogs.sun.com/oleks
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by: CEHJPosted on 2008-11-14 at 10:05:43ID: 22961938
Even two connections on the same thread is too many, since any problem in just one of the connections can crash or block them all. Any serious application will therefore use one thread per connection