io.netty.channel.epoll.AbstractEpollServerChannel Maven / Gradle / Ivy
/*
* Copyright 2015 The Netty Project
*
* The Netty Project licenses this file to you 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.netty.channel.epoll;
import io.netty.channel.Channel;
import io.netty.channel.ChannelConfig;
import io.netty.channel.ChannelOutboundBuffer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;
import io.netty.channel.EventLoop;
import io.netty.channel.ServerChannel;
import io.netty.channel.unix.FileDescriptor;
import io.netty.channel.unix.Socket;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
public abstract class AbstractEpollServerChannel extends AbstractEpollChannel implements ServerChannel {
/**
* @deprecated Use {@link #AbstractEpollServerChannel(Socket, boolean)}.
*/
@Deprecated
protected AbstractEpollServerChannel(int fd) {
this(new Socket(fd), false);
}
/**
* @deprecated Use {@link #AbstractEpollServerChannel(Socket, boolean)}.
*/
@Deprecated
protected AbstractEpollServerChannel(FileDescriptor fd) {
this(new Socket(fd.intValue()));
}
/**
* @deprecated Use {@link #AbstractEpollServerChannel(Socket, boolean)}.
*/
@Deprecated
protected AbstractEpollServerChannel(Socket fd) {
this(fd, isSoErrorZero(fd));
}
protected AbstractEpollServerChannel(Socket fd, boolean active) {
super(null, fd, Native.EPOLLIN, active);
}
@Override
protected boolean isCompatible(EventLoop loop) {
return loop instanceof EpollEventLoop;
}
@Override
protected InetSocketAddress remoteAddress0() {
return null;
}
@Override
protected AbstractEpollUnsafe newUnsafe() {
return new EpollServerSocketUnsafe();
}
@Override
protected void doWrite(ChannelOutboundBuffer in) throws Exception {
throw new UnsupportedOperationException();
}
@Override
protected Object filterOutboundMessage(Object msg) throws Exception {
throw new UnsupportedOperationException();
}
abstract Channel newChildChannel(int fd, byte[] remote, int offset, int len) throws Exception;
final class EpollServerSocketUnsafe extends AbstractEpollUnsafe {
// Will hold the remote address after accept(...) was sucesssful.
// We need 24 bytes for the address as maximum + 1 byte for storing the length.
// So use 26 bytes as it's a power of two.
private final byte[] acceptedAddress = new byte[26];
@Override
public void connect(SocketAddress socketAddress, SocketAddress socketAddress2, ChannelPromise channelPromise) {
// Connect not supported by ServerChannel implementations
channelPromise.setFailure(new UnsupportedOperationException());
}
@Override
void epollInReady() {
assert eventLoop().inEventLoop();
if (fd().isInputShutdown()) {
return;
}
boolean edgeTriggered = isFlagSet(Native.EPOLLET);
final ChannelConfig config = config();
if (!readPending && !edgeTriggered && !config.isAutoRead()) {
// ChannelConfig.setAutoRead(false) was called in the meantime
clearEpollIn0();
return;
}
final ChannelPipeline pipeline = pipeline();
Throwable exception = null;
try {
try {
// if edgeTriggered is used we need to read all messages as we are not notified again otherwise.
final int maxMessagesPerRead = edgeTriggered
? Integer.MAX_VALUE : config.getMaxMessagesPerRead();
int messages = 0;
do {
int socketFd = fd().accept(acceptedAddress);
if (socketFd == -1) {
// this means everything was handled for now
break;
}
readPending = false;
try {
int len = acceptedAddress[0];
pipeline.fireChannelRead(newChildChannel(socketFd, acceptedAddress, 1, len));
} catch (Throwable t) {
// keep on reading as we use epoll ET and need to consume everything from the socket
pipeline.fireChannelReadComplete();
pipeline.fireExceptionCaught(t);
} finally {
if (!edgeTriggered && !config.isAutoRead()) {
// This is not using EPOLLET so we can stop reading
// ASAP as we will get notified again later with
// pending data
break;
}
}
} while (++ messages < maxMessagesPerRead || isRdHup());
} catch (Throwable t) {
exception = t;
}
pipeline.fireChannelReadComplete();
if (exception != null) {
pipeline.fireExceptionCaught(exception);
}
} finally {
// Check if there is a readPending which was not processed yet.
// This could be for two reasons:
// * The user called Channel.read() or ChannelHandlerContext.read() in channelRead(...) method
// * The user called Channel.read() or ChannelHandlerContext.read() in channelReadComplete(...) method
//
// See https://github.com/netty/netty/issues/2254
if (!readPending && !config.isAutoRead()) {
clearEpollIn0();
}
}
}
}
}