forked from netty/netty
/
AbstractEpollServerChannel.java
142 lines (121 loc) · 5.06 KB
/
AbstractEpollServerChannel.java
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/*
* 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:
*
* https://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.ChannelMetadata;
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 java.net.InetSocketAddress;
import java.net.SocketAddress;
public abstract class AbstractEpollServerChannel extends AbstractEpollChannel implements ServerChannel {
private static final ChannelMetadata METADATA = new ChannelMetadata(false, 16);
protected AbstractEpollServerChannel(int fd) {
this(new LinuxSocket(fd), false);
}
AbstractEpollServerChannel(LinuxSocket fd) {
this(fd, isSoErrorZero(fd));
}
AbstractEpollServerChannel(LinuxSocket fd, boolean active) {
super(null, fd, active);
}
@Override
public ChannelMetadata metadata() {
return METADATA;
}
@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 successful.
// 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();
final ChannelConfig config = config();
if (shouldBreakEpollInReady(config)) {
clearEpollIn0();
return;
}
final EpollRecvByteAllocatorHandle allocHandle = recvBufAllocHandle();
allocHandle.edgeTriggered(isFlagSet(Native.EPOLLET));
final ChannelPipeline pipeline = pipeline();
allocHandle.reset(config);
allocHandle.attemptedBytesRead(1);
epollInBefore();
Throwable exception = null;
try {
try {
do {
// lastBytesRead represents the fd. We use lastBytesRead because it must be set so that the
// EpollRecvByteAllocatorHandle knows if it should try to read again or not when autoRead is
// enabled.
allocHandle.lastBytesRead(socket.accept(acceptedAddress));
if (allocHandle.lastBytesRead() == -1) {
// this means everything was handled for now
break;
}
allocHandle.incMessagesRead(1);
readPending = false;
pipeline.fireChannelRead(newChildChannel(allocHandle.lastBytesRead(), acceptedAddress, 1,
acceptedAddress[0]));
} while (allocHandle.continueReading());
} catch (Throwable t) {
exception = t;
}
allocHandle.readComplete();
pipeline.fireChannelReadComplete();
if (exception != null) {
pipeline.fireExceptionCaught(exception);
}
} finally {
epollInFinally(config);
}
}
}
@Override
protected boolean doConnect(SocketAddress remoteAddress, SocketAddress localAddress) throws Exception {
throw new UnsupportedOperationException();
}
}