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package org.glassfish.grizzly.nio;
import org.glassfish.grizzly.CompletionHandler;
import java.io.IOException;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicInteger;
/**
* RoundRobin NIOConnectionDistributor implementation,
* which allocates one SelectorRunner for OP_ACCEPT events and other
* event will be assign to a next SelectorRunner from the array.
*
* @author Alexey Stashok
*/
public class RoundRobinConnectionDistributor
extends AbstractNIOConnectionDistributor {
private AtomicInteger counter;
public RoundRobinConnectionDistributor(AbstractNIOTransport transport) {
super(transport);
counter = new AtomicInteger();
}
public void registerChannel(SelectableChannel channel, int interestOps,
Object attachment) throws IOException {
SelectorRunner runner = getSelectorRunner(interestOps);
transport.getSelectorHandler().registerChannel(runner,
channel, interestOps, attachment);
}
public Future registerChannelAsync(
SelectableChannel channel, int interestOps, Object attachment,
CompletionHandler completionHandler)
throws IOException {
SelectorRunner runner = getSelectorRunner(interestOps);
return transport.getSelectorHandler().registerChannelAsync(
runner, channel, interestOps, attachment, completionHandler);
}
private SelectorRunner getSelectorRunner(int interestOps) {
SelectorRunner[] runners = getTransportSelectorRunners();
int index;
if (interestOps == SelectionKey.OP_ACCEPT || runners.length == 1) {
index = 0;
} else {
index = (counter.incrementAndGet() % (runners.length - 1)) + 1;
}
return runners[index];
}
}