/*
* Copyright 2014 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.reactivex.netty.channel;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.epoll.EpollEventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.util.concurrent.Future;
import io.reactivex.netty.RxNetty;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
/**
* An implementation of {@link RxEventLoopProvider} that returns the same {@link EventLoopGroup} instance for both
* client and server.
*
* @author Nitesh Kant
*/
public class SingleNioLoopProvider extends RxEventLoopProvider {
private final SharedNioEventLoopGroup eventLoop;
private final SharedNioEventLoopGroup parentEventLoop;
private final AtomicReference<EpollEventLoopGroup> nativeEventLoop;
private final AtomicReference<EpollEventLoopGroup> nativeParentEventLoop;
private final int parentEventLoopCount;
private final int childEventLoopCount;
public SingleNioLoopProvider() {
this(Runtime.getRuntime().availableProcessors());
}
public SingleNioLoopProvider(int threadCount) {
eventLoop = new SharedNioEventLoopGroup(threadCount);
parentEventLoop = eventLoop;
parentEventLoopCount = childEventLoopCount = threadCount;
nativeEventLoop = new AtomicReference<EpollEventLoopGroup>();
nativeParentEventLoop = nativeEventLoop;
}
public SingleNioLoopProvider(int parentEventLoopCount, int childEventLoopCount) {
this.parentEventLoopCount = parentEventLoopCount;
this.childEventLoopCount = childEventLoopCount;
parentEventLoop = new SharedNioEventLoopGroup(parentEventLoopCount);
eventLoop = new SharedNioEventLoopGroup(childEventLoopCount);
nativeParentEventLoop = new AtomicReference<EpollEventLoopGroup>();
nativeEventLoop = new AtomicReference<EpollEventLoopGroup>();
}
@Override
public EventLoopGroup globalClientEventLoop() {
eventLoop.retain();
return eventLoop;
}
@Override
public EventLoopGroup globalServerEventLoop() {
eventLoop.retain();
return eventLoop;
}
@Override
public EventLoopGroup globalServerParentEventLoop() {
return parentEventLoop;
}
@Override
public EventLoopGroup globalClientEventLoop(boolean nativeTransport) {
if (nativeTransport && RxNetty.isUsingNativeTransport()) {
return getNativeEventLoop();
}
return globalClientEventLoop();
}
@Override
public EventLoopGroup globalServerEventLoop(boolean nativeTransport) {
if (nativeTransport && RxNetty.isUsingNativeTransport()) {
return getNativeEventLoop();
}
return globalServerEventLoop();
}
@Override
public EventLoopGroup globalServerParentEventLoop(boolean nativeTransport) {
if (nativeTransport && RxNetty.isUsingNativeTransport()) {
return getNativeParentEventLoop();
}
return globalServerParentEventLoop();
}
private EpollEventLoopGroup getNativeParentEventLoop() {
if (nativeParentEventLoop == nativeEventLoop) { // Means using same event loop for acceptor and worker pool.
return getNativeEventLoop();
}
EpollEventLoopGroup eventLoopGroup = nativeParentEventLoop.get();
if (null == eventLoopGroup) {
EpollEventLoopGroup newEventLoopGroup = new EpollEventLoopGroup(parentEventLoopCount);
if (!nativeParentEventLoop.compareAndSet(null, newEventLoopGroup)) {
newEventLoopGroup.shutdownGracefully();
}
}
return nativeParentEventLoop.get();
}
private EpollEventLoopGroup getNativeEventLoop() {
EpollEventLoopGroup eventLoopGroup = nativeEventLoop.get();
if (null == eventLoopGroup) {
EpollEventLoopGroup newEventLoopGroup = new EpollEventLoopGroup(childEventLoopCount);
if (!nativeEventLoop.compareAndSet(null, newEventLoopGroup)) {
newEventLoopGroup.shutdownGracefully();
}
}
return nativeEventLoop.get();
}
public static class SharedNioEventLoopGroup extends NioEventLoopGroup {
private final AtomicInteger refCount = new AtomicInteger();
public SharedNioEventLoopGroup() {
super(0, new RxDefaultThreadFactory("rx-selector"));
}
public SharedNioEventLoopGroup(int threadCount) {
super(threadCount, new RxDefaultThreadFactory("rx-selector"));
}
@Override
public Future<?> shutdownGracefully(long quietPeriod, long timeout, TimeUnit unit) {
if (0 == release()) {
return super.shutdownGracefully(quietPeriod, timeout, unit);
} else {
return terminationFuture();
}
}
@Override
@Deprecated
public void shutdown() {
if (0 == release()) {
super.shutdown();
}
}
public int retain() {
return refCount.incrementAndGet();
}
public int release() {
return refCount.decrementAndGet();
}
}
}