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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2008-2014 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
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* file and include the License file at packager/legal/LICENSE.txt.
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*/
package com.pdd.pop.ext.glassfish.grizzly.nio;
import java.io.IOException;
import java.nio.channels.SelectableChannel;
import java.util.concurrent.atomic.AtomicInteger;
import com.pdd.pop.ext.glassfish.grizzly.CompletionHandler;
import com.pdd.pop.ext.glassfish.grizzly.Connection;
/**
* 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 final class RoundRobinConnectionDistributor
extends AbstractNIOConnectionDistributor {
private final Iterator it;
public RoundRobinConnectionDistributor(final NIOTransport transport) {
this(transport, false, false);
}
public RoundRobinConnectionDistributor(final NIOTransport transport,
final boolean useDedicatedAcceptor) {
this(transport, useDedicatedAcceptor, false);
}
/**
* Constructs RoundRobinConnectionDistributor with the given configuration.
*
* @param transport
* @param useDedicatedAcceptor depending on this flag server {@link Connection}s,
* responsible for accepting client connections, will or will not
* use dedicated {@link SelectorRunner}
* @param isServerOnly true means this {@link NIOChannelDistributor}
* will be used by a {@link Transport}, which operates as a
* server only(the Transport will never initiate a client-side {@link Connection}).
* In this case we're able to use optimized (thread unsafe) distribution algorithm.
*/
public RoundRobinConnectionDistributor(final NIOTransport transport,
final boolean useDedicatedAcceptor, final boolean isServerOnly) {
super(transport);
this.it = useDedicatedAcceptor ?
(isServerOnly ? new ServDedicatedIterator() : new DedicatedIterator()) :
(isServerOnly ? new ServSharedIterator() : new SharedIterator());
}
@Override
public void registerChannel(final SelectableChannel channel,
final int interestOps, final Object attachment) throws IOException {
transport.getSelectorHandler().registerChannel(it.next(),
channel, interestOps, attachment);
}
@Override
public void registerChannelAsync(
final SelectableChannel channel, final int interestOps,
final Object attachment,
final CompletionHandler completionHandler) {
transport.getSelectorHandler().registerChannelAsync(
it.next(), channel, interestOps, attachment, completionHandler);
}
@Override
public void registerServiceChannelAsync(
final SelectableChannel channel, final int interestOps,
final Object attachment,
final CompletionHandler completionHandler) {
transport.getSelectorHandler().registerChannelAsync(
it.nextService(), channel, interestOps,
attachment, completionHandler);
}
private interface Iterator {
SelectorRunner next();
SelectorRunner nextService();
}
private final class DedicatedIterator implements Iterator {
private final AtomicInteger counter = new AtomicInteger();
@Override
public SelectorRunner next() {
final SelectorRunner[] runners = getTransportSelectorRunners();
if (runners.length == 1) {
return runners[0];
}
return runners[((counter.getAndIncrement() & 0x7fffffff) % (runners.length - 1)) + 1];
}
@Override
public SelectorRunner nextService() {
return getTransportSelectorRunners()[0];
}
}
private final class SharedIterator implements Iterator {
private final AtomicInteger counter = new AtomicInteger();
@Override
public SelectorRunner next() {
final SelectorRunner[] runners = getTransportSelectorRunners();
if (runners.length == 1) {
return runners[0];
}
return runners[(counter.getAndIncrement() & 0x7fffffff) % runners.length];
}
@Override
public SelectorRunner nextService() {
return next();
}
}
private final class ServDedicatedIterator implements Iterator {
private int counter;
@Override
public SelectorRunner next() {
final SelectorRunner[] runners = getTransportSelectorRunners();
if (runners.length == 1) {
return runners[0];
}
return runners[((counter++ & 0x7fffffff) % (runners.length - 1)) + 1];
}
@Override
public SelectorRunner nextService() {
return getTransportSelectorRunners()[0];
}
}
private final class ServSharedIterator implements Iterator {
private int counter;
@Override
public SelectorRunner next() {
final SelectorRunner[] runners = getTransportSelectorRunners();
if (runners.length == 1) {
return runners[0];
}
return runners[(counter++ & 0x7fffffff) % runners.length];
}
@Override
public SelectorRunner nextService() {
return next();
}
}
}
