472 lines
15 KiB
Java
472 lines
15 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.channel.socket.nio;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelException;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelMetadata;
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import io.netty.channel.ChannelOutboundBuffer;
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import io.netty.channel.ChannelPromise;
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import io.netty.channel.EventLoop;
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import io.netty.channel.FileRegion;
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import io.netty.channel.RecvByteBufAllocator;
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import io.netty.channel.nio.AbstractNioByteChannel;
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import io.netty.channel.socket.DefaultSocketChannelConfig;
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import io.netty.channel.socket.ServerSocketChannel;
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import io.netty.channel.socket.SocketChannelConfig;
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import io.netty.util.concurrent.GlobalEventExecutor;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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import java.io.IOException;
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import java.net.InetSocketAddress;
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import java.net.Socket;
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import java.net.SocketAddress;
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import java.nio.ByteBuffer;
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import java.nio.channels.SelectionKey;
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import java.nio.channels.SocketChannel;
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import java.nio.channels.spi.SelectorProvider;
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import java.util.concurrent.Executor;
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/**
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* {@link io.netty.channel.socket.SocketChannel} which uses NIO selector based implementation.
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*/
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public class NioSocketChannel extends AbstractNioByteChannel implements io.netty.channel.socket.SocketChannel {
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(NioSocketChannel.class);
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private static final ChannelMetadata METADATA = new ChannelMetadata(false, 16);
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private static final SelectorProvider DEFAULT_SELECTOR_PROVIDER = SelectorProvider.provider();
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private static SocketChannel newSocket(SelectorProvider provider) {
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try {
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/**
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* Use the {@link SelectorProvider} to open {@link SocketChannel} and so remove condition in
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* {@link SelectorProvider#provider()} which is called by each SocketChannel.open() otherwise.
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*
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* See <a href="https://github.com/netty/netty/issues/2308">#2308</a>.
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*/
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return provider.openSocketChannel();
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} catch (IOException e) {
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throw new ChannelException("Failed to open a socket.", e);
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}
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}
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private final SocketChannelConfig config;
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/**
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* Create a new instance
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*/
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public NioSocketChannel() {
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this(DEFAULT_SELECTOR_PROVIDER);
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}
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/**
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* Create a new instance using the given {@link SelectorProvider}.
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*/
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public NioSocketChannel(SelectorProvider provider) {
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this(newSocket(provider));
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}
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/**
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* Create a new instance using the given {@link SocketChannel}.
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*/
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public NioSocketChannel(SocketChannel socket) {
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this(null, socket);
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}
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/**
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* Create a new instance
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*
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* @param parent the {@link Channel} which created this instance or {@code null} if it was created by the user
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* @param socket the {@link SocketChannel} which will be used
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*/
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public NioSocketChannel(Channel parent, SocketChannel socket) {
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super(parent, socket);
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config = new NioSocketChannelConfig(this, socket.socket());
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}
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@Override
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public ServerSocketChannel parent() {
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return (ServerSocketChannel) super.parent();
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}
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@Override
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public ChannelMetadata metadata() {
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return METADATA;
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}
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@Override
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public SocketChannelConfig config() {
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return config;
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}
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@Override
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protected SocketChannel javaChannel() {
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return (SocketChannel) super.javaChannel();
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}
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@Override
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public boolean isActive() {
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SocketChannel ch = javaChannel();
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return ch.isOpen() && ch.isConnected();
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}
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@Override
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public boolean isOutputShutdown() {
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return javaChannel().socket().isOutputShutdown() || !isActive();
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}
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@Override
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public boolean isInputShutdown() {
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return javaChannel().socket().isInputShutdown() || !isActive();
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}
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@Override
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public boolean isShutdown() {
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Socket socket = javaChannel().socket();
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return socket.isInputShutdown() && socket.isOutputShutdown() || !isActive();
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}
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@Override
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public InetSocketAddress localAddress() {
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return (InetSocketAddress) super.localAddress();
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}
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@Override
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public InetSocketAddress remoteAddress() {
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return (InetSocketAddress) super.remoteAddress();
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}
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@Override
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public ChannelFuture shutdownOutput() {
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return shutdownOutput(newPromise());
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}
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@Override
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public ChannelFuture shutdownOutput(final ChannelPromise promise) {
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Executor closeExecutor = ((NioSocketChannelUnsafe) unsafe()).prepareToClose();
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if (closeExecutor != null) {
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closeExecutor.execute(new Runnable() {
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@Override
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public void run() {
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shutdownOutput0(promise);
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}
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});
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} else {
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EventLoop loop = eventLoop();
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if (loop.inEventLoop()) {
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shutdownOutput0(promise);
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} else {
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loop.execute(new Runnable() {
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@Override
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public void run() {
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shutdownOutput0(promise);
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}
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});
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}
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}
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return promise;
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}
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@Override
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public ChannelFuture shutdownInput() {
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return shutdownInput(newPromise());
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}
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@Override
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public ChannelFuture shutdownInput(final ChannelPromise promise) {
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Executor closeExecutor = ((NioSocketChannelUnsafe) unsafe()).prepareToClose();
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if (closeExecutor != null) {
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closeExecutor.execute(new Runnable() {
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@Override
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public void run() {
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shutdownInput0(promise);
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}
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});
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} else {
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EventLoop loop = eventLoop();
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if (loop.inEventLoop()) {
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shutdownInput0(promise);
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} else {
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loop.execute(new Runnable() {
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@Override
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public void run() {
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shutdownInput0(promise);
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}
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});
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}
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}
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return promise;
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}
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@Override
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public ChannelFuture shutdown() {
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return shutdown(newPromise());
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}
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@Override
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public ChannelFuture shutdown(final ChannelPromise promise) {
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Executor closeExecutor = ((NioSocketChannelUnsafe) unsafe()).prepareToClose();
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if (closeExecutor != null) {
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closeExecutor.execute(new Runnable() {
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@Override
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public void run() {
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shutdown0(promise);
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}
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});
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} else {
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EventLoop loop = eventLoop();
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if (loop.inEventLoop()) {
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shutdown0(promise);
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} else {
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loop.execute(new Runnable() {
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@Override
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public void run() {
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shutdown0(promise);
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}
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});
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}
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}
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return promise;
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}
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private void shutdownOutput0(final ChannelPromise promise) {
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try {
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javaChannel().socket().shutdownOutput();
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promise.setSuccess();
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} catch (Throwable t) {
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promise.setFailure(t);
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}
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}
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private void shutdownInput0(final ChannelPromise promise) {
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try {
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javaChannel().socket().shutdownInput();
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promise.setSuccess();
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} catch (Throwable t) {
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promise.setFailure(t);
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}
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}
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private void shutdown0(final ChannelPromise promise) {
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Socket socket = javaChannel().socket();
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Throwable cause = null;
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try {
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socket.shutdownOutput();
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} catch (Throwable t) {
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cause = t;
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}
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try {
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socket.shutdownInput();
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} catch (Throwable t) {
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if (cause == null) {
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promise.setFailure(t);
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} else {
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logger.debug("Exception suppressed because a previous exception occurred.", t);
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promise.setFailure(cause);
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}
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return;
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}
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if (cause == null) {
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promise.setSuccess();
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} else {
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promise.setFailure(cause);
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}
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}
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@Override
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protected SocketAddress localAddress0() {
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return javaChannel().socket().getLocalSocketAddress();
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}
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@Override
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protected SocketAddress remoteAddress0() {
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return javaChannel().socket().getRemoteSocketAddress();
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}
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@Override
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protected void doBind(SocketAddress localAddress) throws Exception {
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javaChannel().socket().bind(localAddress);
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}
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@Override
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protected boolean doConnect(SocketAddress remoteAddress, SocketAddress localAddress) throws Exception {
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if (localAddress != null) {
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javaChannel().socket().bind(localAddress);
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}
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boolean success = false;
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try {
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boolean connected = javaChannel().connect(remoteAddress);
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if (!connected) {
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selectionKey().interestOps(SelectionKey.OP_CONNECT);
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}
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success = true;
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return connected;
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} finally {
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if (!success) {
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doClose();
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}
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}
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}
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@Override
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protected void doFinishConnect() throws Exception {
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if (!javaChannel().finishConnect()) {
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throw new Error();
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}
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}
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@Override
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protected void doDisconnect() throws Exception {
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doClose();
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}
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@Override
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protected void doClose() throws Exception {
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super.doClose();
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javaChannel().close();
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}
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@Override
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protected int doReadBytes(ByteBuf byteBuf) throws Exception {
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final RecvByteBufAllocator.Handle allocHandle = unsafe().recvBufAllocHandle();
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allocHandle.attemptedBytesRead(byteBuf.writableBytes());
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return byteBuf.writeBytes(javaChannel(), allocHandle.attemptedBytesRead());
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}
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@Override
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protected int doWriteBytes(ByteBuf buf) throws Exception {
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final int expectedWrittenBytes = buf.readableBytes();
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return buf.readBytes(javaChannel(), expectedWrittenBytes);
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}
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@Override
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protected long doWriteFileRegion(FileRegion region) throws Exception {
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final long position = region.transferred();
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return region.transferTo(javaChannel(), position);
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}
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@Override
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protected void doWrite(ChannelOutboundBuffer in) throws Exception {
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for (;;) {
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int size = in.size();
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if (size == 0) {
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// All written so clear OP_WRITE
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clearOpWrite();
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break;
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}
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long writtenBytes = 0;
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boolean done = false;
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boolean setOpWrite = false;
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// Ensure the pending writes are made of ByteBufs only.
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ByteBuffer[] nioBuffers = in.nioBuffers();
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int nioBufferCnt = in.nioBufferCount();
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long expectedWrittenBytes = in.nioBufferSize();
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SocketChannel ch = javaChannel();
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// Always us nioBuffers() to workaround data-corruption.
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// See https://github.com/netty/netty/issues/2761
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switch (nioBufferCnt) {
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case 0:
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// We have something else beside ByteBuffers to write so fallback to normal writes.
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super.doWrite(in);
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return;
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case 1:
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// Only one ByteBuf so use non-gathering write
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ByteBuffer nioBuffer = nioBuffers[0];
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for (int i = config().getWriteSpinCount() - 1; i >= 0; i --) {
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final int localWrittenBytes = ch.write(nioBuffer);
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if (localWrittenBytes == 0) {
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setOpWrite = true;
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break;
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}
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expectedWrittenBytes -= localWrittenBytes;
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writtenBytes += localWrittenBytes;
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if (expectedWrittenBytes == 0) {
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done = true;
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break;
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}
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}
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break;
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default:
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for (int i = config().getWriteSpinCount() - 1; i >= 0; i --) {
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final long localWrittenBytes = ch.write(nioBuffers, 0, nioBufferCnt);
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if (localWrittenBytes == 0) {
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setOpWrite = true;
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break;
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}
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expectedWrittenBytes -= localWrittenBytes;
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writtenBytes += localWrittenBytes;
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if (expectedWrittenBytes == 0) {
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done = true;
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break;
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}
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}
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break;
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}
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// Release the fully written buffers, and update the indexes of the partially written buffer.
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in.removeBytes(writtenBytes);
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if (!done) {
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// Did not write all buffers completely.
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incompleteWrite(setOpWrite);
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break;
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}
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}
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}
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@Override
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protected AbstractNioUnsafe newUnsafe() {
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return new NioSocketChannelUnsafe();
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}
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private final class NioSocketChannelUnsafe extends NioByteUnsafe {
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@Override
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protected Executor prepareToClose() {
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try {
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if (javaChannel().isOpen() && config().getSoLinger() > 0) {
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// We need to cancel this key of the channel so we may not end up in a eventloop spin
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// because we try to read or write until the actual close happens which may be later due
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// SO_LINGER handling.
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// See https://github.com/netty/netty/issues/4449
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doDeregister();
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return GlobalEventExecutor.INSTANCE;
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}
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} catch (Throwable ignore) {
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// Ignore the error as the underlying channel may be closed in the meantime and so
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// getSoLinger() may produce an exception. In this case we just return null.
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// See https://github.com/netty/netty/issues/4449
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}
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return null;
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}
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}
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private final class NioSocketChannelConfig extends DefaultSocketChannelConfig {
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private NioSocketChannelConfig(NioSocketChannel channel, Socket javaSocket) {
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super(channel, javaSocket);
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}
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@Override
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protected void autoReadCleared() {
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clearReadPending();
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}
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}
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}
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