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The NIO implementation of the XNIO project
/*
* JBoss, Home of Professional Open Source
*
* Copyright 2015 Red Hat, Inc. and/or its affiliates.
*
* 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 org.xnio.nio;
import static org.xnio.IoUtils.safeClose;
import static org.xnio.nio.Log.log;
import static org.xnio.nio.Log.tcpServerLog;
import java.io.Closeable;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketAddress;
import java.nio.channels.SelectionKey;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import org.jboss.logging.Logger;
import org.xnio.ChannelListener;
import org.xnio.ChannelListeners;
import org.xnio.IoUtils;
import org.xnio.LocalSocketAddress;
import org.xnio.Option;
import org.xnio.OptionMap;
import org.xnio.Options;
import org.xnio.StreamConnection;
import org.xnio.XnioExecutor;
import org.xnio.channels.AcceptListenerSettable;
import org.xnio.channels.AcceptingChannel;
import org.xnio.channels.UnsupportedOptionException;
import org.xnio.management.XnioServerMXBean;
final class QueuedNioTcpServer extends AbstractNioChannel implements AcceptingChannel, AcceptListenerSettable {
private static final String FQCN = QueuedNioTcpServer.class.getName();
private volatile ChannelListener acceptListener;
private final QueuedNioTcpServerHandle handle;
private final WorkerThread thread;
private final ServerSocketChannel channel;
private final ServerSocket socket;
private final Closeable mbeanHandle;
private final List> acceptQueues;
private static final Set> options = Option.setBuilder()
.add(Options.REUSE_ADDRESSES)
.add(Options.RECEIVE_BUFFER)
.add(Options.SEND_BUFFER)
.add(Options.KEEP_ALIVE)
.add(Options.TCP_OOB_INLINE)
.add(Options.TCP_NODELAY)
.add(Options.CONNECTION_HIGH_WATER)
.add(Options.CONNECTION_LOW_WATER)
.add(Options.READ_TIMEOUT)
.add(Options.WRITE_TIMEOUT)
.create();
@SuppressWarnings("unused")
private volatile int keepAlive;
@SuppressWarnings("unused")
private volatile int oobInline;
@SuppressWarnings("unused")
private volatile int tcpNoDelay;
@SuppressWarnings("unused")
private volatile int sendBuffer = -1;
@SuppressWarnings("unused")
private volatile long connectionStatus = CONN_LOW_MASK | CONN_HIGH_MASK;
@SuppressWarnings("unused")
private volatile int readTimeout;
@SuppressWarnings("unused")
private volatile int writeTimeout;
private static final long CONN_LOW_MASK = 0x000000007FFFFFFFL;
private static final long CONN_LOW_BIT = 0L;
@SuppressWarnings("unused")
private static final long CONN_LOW_ONE = 1L;
private static final long CONN_HIGH_MASK = 0x3FFFFFFF80000000L;
private static final long CONN_HIGH_BIT = 31L;
@SuppressWarnings("unused")
private static final long CONN_HIGH_ONE = 1L << CONN_HIGH_BIT;
/**
* The current number of open connections, can only be accessed by the accept thread
*/
private int openConnections;
private volatile boolean suspendedDueToWatermark;
private volatile boolean suspended;
private static final AtomicIntegerFieldUpdater keepAliveUpdater = AtomicIntegerFieldUpdater.newUpdater(QueuedNioTcpServer.class, "keepAlive");
private static final AtomicIntegerFieldUpdater oobInlineUpdater = AtomicIntegerFieldUpdater.newUpdater(QueuedNioTcpServer.class, "oobInline");
private static final AtomicIntegerFieldUpdater tcpNoDelayUpdater = AtomicIntegerFieldUpdater.newUpdater(QueuedNioTcpServer.class, "tcpNoDelay");
private static final AtomicIntegerFieldUpdater sendBufferUpdater = AtomicIntegerFieldUpdater.newUpdater(QueuedNioTcpServer.class, "sendBuffer");
private static final AtomicIntegerFieldUpdater readTimeoutUpdater = AtomicIntegerFieldUpdater.newUpdater(QueuedNioTcpServer.class, "readTimeout");
private static final AtomicIntegerFieldUpdater writeTimeoutUpdater = AtomicIntegerFieldUpdater.newUpdater(QueuedNioTcpServer.class, "writeTimeout");
private static final AtomicLongFieldUpdater connectionStatusUpdater = AtomicLongFieldUpdater.newUpdater(QueuedNioTcpServer.class, "connectionStatus");
private final Runnable acceptTask = new Runnable() {
public void run() {
final WorkerThread current = WorkerThread.getCurrent();
assert current != null;
final BlockingQueue queue = acceptQueues.get(current.getNumber());
ChannelListeners.invokeChannelListener(QueuedNioTcpServer.this, getAcceptListener());
if (! queue.isEmpty() && !suspendedDueToWatermark) {
current.execute(this);
}
}
};
private final Runnable connectionClosedTask = new Runnable() {
@Override
public void run() {
openConnections--;
if(suspendedDueToWatermark && openConnections < getLowWater(connectionStatus)) {
synchronized (QueuedNioTcpServer.this) {
suspendedDueToWatermark = false;
}
}
}
};
QueuedNioTcpServer(final NioXnioWorker worker, final ServerSocketChannel channel, final OptionMap optionMap) throws IOException {
super(worker);
this.channel = channel;
this.thread = worker.getAcceptThread();
final WorkerThread[] workerThreads = worker.getAll();
final List> acceptQueues = new ArrayList<>(workerThreads.length);
for (int i = 0; i < workerThreads.length; i++) {
acceptQueues.add(i, new LinkedBlockingQueue());
}
this.acceptQueues = acceptQueues;
socket = channel.socket();
if (optionMap.contains(Options.SEND_BUFFER)) {
final int sendBufferSize = optionMap.get(Options.SEND_BUFFER, DEFAULT_BUFFER_SIZE);
if (sendBufferSize < 1) {
throw log.parameterOutOfRange("sendBufferSize");
}
sendBufferUpdater.set(this, sendBufferSize);
}
if (optionMap.contains(Options.KEEP_ALIVE)) {
keepAliveUpdater.lazySet(this, optionMap.get(Options.KEEP_ALIVE, false) ? 1 : 0);
}
if (optionMap.contains(Options.TCP_OOB_INLINE)) {
oobInlineUpdater.lazySet(this, optionMap.get(Options.TCP_OOB_INLINE, false) ? 1 : 0);
}
if (optionMap.contains(Options.TCP_NODELAY)) {
tcpNoDelayUpdater.lazySet(this, optionMap.get(Options.TCP_NODELAY, false) ? 1 : 0);
}
if (optionMap.contains(Options.READ_TIMEOUT)) {
readTimeoutUpdater.lazySet(this, optionMap.get(Options.READ_TIMEOUT, 0));
}
if (optionMap.contains(Options.WRITE_TIMEOUT)) {
writeTimeoutUpdater.lazySet(this, optionMap.get(Options.WRITE_TIMEOUT, 0));
}
final int highWater;
final int lowWater;
if (optionMap.contains(Options.CONNECTION_HIGH_WATER) || optionMap.contains(Options.CONNECTION_LOW_WATER)) {
highWater = optionMap.get(Options.CONNECTION_HIGH_WATER, Integer.MAX_VALUE);
lowWater = optionMap.get(Options.CONNECTION_LOW_WATER, highWater);
if (highWater <= 0) {
throw badHighWater();
}
if (lowWater <= 0 || lowWater > highWater) {
throw badLowWater(highWater);
}
final long highLowWater = (long) highWater << CONN_HIGH_BIT | (long) lowWater << CONN_LOW_BIT;
connectionStatusUpdater.lazySet(this, highLowWater);
} else {
highWater = Integer.MAX_VALUE;
lowWater = Integer.MAX_VALUE;
connectionStatusUpdater.lazySet(this, CONN_LOW_MASK | CONN_HIGH_MASK);
}
final SelectionKey key = thread.registerChannel(channel);
handle = new QueuedNioTcpServerHandle(this, thread, key, highWater, lowWater);
key.attach(handle);
mbeanHandle = NioXnio.register(new XnioServerMXBean() {
public String getProviderName() {
return "nio";
}
public String getWorkerName() {
return worker.getName();
}
public String getBindAddress() {
return String.valueOf(getLocalAddress());
}
public int getConnectionCount() {
return handle.getConnectionCount();
}
public int getConnectionLimitHighWater() {
return getHighWater(connectionStatus);
}
public int getConnectionLimitLowWater() {
return getLowWater(connectionStatus);
}
});
}
private static IllegalArgumentException badLowWater(final int highWater) {
return new IllegalArgumentException("Low water must be greater than 0 and less than or equal to high water (" + highWater + ")");
}
private static IllegalArgumentException badHighWater() {
return new IllegalArgumentException("High water must be greater than 0");
}
public void close() throws IOException {
try {
channel.close();
} finally {
handle.getWorkerThread().cancelKey(handle.getSelectionKey());
safeClose(mbeanHandle);
}
}
public boolean supportsOption(final Option option) {
return options.contains(option);
}
public T getOption(final Option option) throws UnsupportedOptionException, IOException {
if (option == Options.REUSE_ADDRESSES) {
return option.cast(Boolean.valueOf(socket.getReuseAddress()));
} else if (option == Options.RECEIVE_BUFFER) {
return option.cast(Integer.valueOf(socket.getReceiveBufferSize()));
} else if (option == Options.SEND_BUFFER) {
final int value = sendBuffer;
return value == -1 ? null : option.cast(Integer.valueOf(value));
} else if (option == Options.KEEP_ALIVE) {
return option.cast(Boolean.valueOf(keepAlive != 0));
} else if (option == Options.TCP_OOB_INLINE) {
return option.cast(Boolean.valueOf(oobInline != 0));
} else if (option == Options.TCP_NODELAY) {
return option.cast(Boolean.valueOf(tcpNoDelay != 0));
} else if (option == Options.READ_TIMEOUT) {
return option.cast(Integer.valueOf(readTimeout));
} else if (option == Options.WRITE_TIMEOUT) {
return option.cast(Integer.valueOf(writeTimeout));
} else if (option == Options.CONNECTION_HIGH_WATER) {
return option.cast(Integer.valueOf(getHighWater(connectionStatus)));
} else if (option == Options.CONNECTION_LOW_WATER) {
return option.cast(Integer.valueOf(getLowWater(connectionStatus)));
} else {
return null;
}
}
public T setOption(final Option option, final T value) throws IllegalArgumentException, IOException {
final Object old;
if (option == Options.REUSE_ADDRESSES) {
old = Boolean.valueOf(socket.getReuseAddress());
socket.setReuseAddress(Options.REUSE_ADDRESSES.cast(value, Boolean.FALSE).booleanValue());
} else if (option == Options.RECEIVE_BUFFER) {
old = Integer.valueOf(socket.getReceiveBufferSize());
final int newValue = Options.RECEIVE_BUFFER.cast(value, Integer.valueOf(DEFAULT_BUFFER_SIZE)).intValue();
if (newValue < 1) {
throw log.optionOutOfRange("RECEIVE_BUFFER");
}
socket.setReceiveBufferSize(newValue);
} else if (option == Options.SEND_BUFFER) {
final int newValue = Options.SEND_BUFFER.cast(value, Integer.valueOf(DEFAULT_BUFFER_SIZE)).intValue();
if (newValue < 1) {
throw log.optionOutOfRange("SEND_BUFFER");
}
final int oldValue = sendBufferUpdater.getAndSet(this, newValue);
old = oldValue == -1 ? null : Integer.valueOf(oldValue);
} else if (option == Options.KEEP_ALIVE) {
old = Boolean.valueOf(keepAliveUpdater.getAndSet(this, Options.KEEP_ALIVE.cast(value, Boolean.FALSE).booleanValue() ? 1 : 0) != 0);
} else if (option == Options.TCP_OOB_INLINE) {
old = Boolean.valueOf(oobInlineUpdater.getAndSet(this, Options.TCP_OOB_INLINE.cast(value, Boolean.FALSE).booleanValue() ? 1 : 0) != 0);
} else if (option == Options.TCP_NODELAY) {
old = Boolean.valueOf(tcpNoDelayUpdater.getAndSet(this, Options.TCP_NODELAY.cast(value, Boolean.FALSE).booleanValue() ? 1 : 0) != 0);
} else if (option == Options.READ_TIMEOUT) {
old = Integer.valueOf(readTimeoutUpdater.getAndSet(this, Options.READ_TIMEOUT.cast(value, Integer.valueOf(0)).intValue()));
} else if (option == Options.WRITE_TIMEOUT) {
old = Integer.valueOf(writeTimeoutUpdater.getAndSet(this, Options.WRITE_TIMEOUT.cast(value, Integer.valueOf(0)).intValue()));
} else if (option == Options.CONNECTION_HIGH_WATER) {
old = Integer.valueOf(getHighWater(updateWaterMark(-1, Options.CONNECTION_HIGH_WATER.cast(value, Integer.valueOf(Integer.MAX_VALUE)).intValue())));
} else if (option == Options.CONNECTION_LOW_WATER) {
old = Integer.valueOf(getLowWater(updateWaterMark(Options.CONNECTION_LOW_WATER.cast(value, Integer.valueOf(Integer.MAX_VALUE)).intValue(), -1)));
} else {
return null;
}
return option.cast(old);
}
private long updateWaterMark(int reqNewLowWater, int reqNewHighWater) {
// at least one must be specified
assert reqNewLowWater != -1 || reqNewHighWater != -1;
// if both given, low must be less than high
assert reqNewLowWater == -1 || reqNewHighWater == -1 || reqNewLowWater <= reqNewHighWater;
long oldVal, newVal;
int oldHighWater, oldLowWater;
int newLowWater, newHighWater;
do {
oldVal = connectionStatus;
oldLowWater = getLowWater(oldVal);
oldHighWater = getHighWater(oldVal);
newLowWater = reqNewLowWater == -1 ? oldLowWater : reqNewLowWater;
newHighWater = reqNewHighWater == -1 ? oldHighWater : reqNewHighWater;
// Make sure the new values make sense
if (reqNewLowWater != -1 && newLowWater > newHighWater) {
newHighWater = newLowWater;
} else if (reqNewHighWater != -1 && newHighWater < newLowWater) {
newLowWater = newHighWater;
}
// See if the change would be redundant
if (oldLowWater == newLowWater && oldHighWater == newHighWater) {
return oldVal;
}
newVal = (long)newLowWater << CONN_LOW_BIT | (long)newHighWater << CONN_HIGH_BIT;
} while (! connectionStatusUpdater.compareAndSet(this, oldVal, newVal));
getIoThread().execute(new Runnable() {
@Override
public void run() {
if(openConnections >= getHighWater(connectionStatus)) {
synchronized (QueuedNioTcpServer.this) {
suspendedDueToWatermark = true;
}
} else if(suspendedDueToWatermark && openConnections <= getLowWater(connectionStatus)) {
suspendedDueToWatermark = false;
}
}
});
return oldVal;
}
private static int getHighWater(final long value) {
return (int) ((value & CONN_HIGH_MASK) >> CONN_HIGH_BIT);
}
private static int getLowWater(final long value) {
return (int) ((value & CONN_LOW_MASK) >> CONN_LOW_BIT);
}
public NioSocketStreamConnection accept() throws IOException {
final WorkerThread current = WorkerThread.getCurrent();
if (current == null) {
return null;
}
final BlockingQueue socketChannels = acceptQueues.get(current.getNumber());
final SocketChannel accepted;
boolean ok = false;
try {
accepted = socketChannels.poll();
if (accepted != null) try {
final SelectionKey selectionKey = current.registerChannel(accepted);
final NioSocketStreamConnection newConnection = new NioSocketStreamConnection(current, selectionKey, handle);
newConnection.setOption(Options.READ_TIMEOUT, Integer.valueOf(readTimeout));
newConnection.setOption(Options.WRITE_TIMEOUT, Integer.valueOf(writeTimeout));
ok = true;
return newConnection;
} finally {
if (! ok) safeClose(accepted);
}
} catch (IOException e) {
return null;
} finally {
if (! ok) {
handle.freeConnection();
}
}
// by contract, only a resume will do
return null;
}
public String toString() {
return String.format("TCP server (NIO) <%s>", Integer.toHexString(hashCode()));
}
public ChannelListener getAcceptListener() {
return acceptListener;
}
public void setAcceptListener(final ChannelListener acceptListener) {
this.acceptListener = acceptListener;
}
public ChannelListener.Setter getAcceptSetter() {
return new Setter(this);
}
public boolean isOpen() {
return channel.isOpen();
}
public SocketAddress getLocalAddress() {
return socket.getLocalSocketAddress();
}
public A getLocalAddress(final Class type) {
final SocketAddress address = getLocalAddress();
return type.isInstance(address) ? type.cast(address) : null;
}
public void suspendAccepts() {
synchronized (this) {
handle.suspend(SelectionKey.OP_ACCEPT);
suspended = true;
}
}
public void resumeAccepts() {
synchronized (this) {
suspended = false;
handle.resume(SelectionKey.OP_ACCEPT);
}
}
public boolean isAcceptResumed() {
return !suspended;
}
public void wakeupAccepts() {
tcpServerLog.logf(FQCN, Logger.Level.TRACE, null, "Wake up accepts on %s", this);
resumeAccepts();
handle.wakeup(SelectionKey.OP_ACCEPT);
}
public void awaitAcceptable() throws IOException {
throw log.unsupported("awaitAcceptable");
}
public void awaitAcceptable(final long time, final TimeUnit timeUnit) throws IOException {
throw log.unsupported("awaitAcceptable");
}
@Deprecated
public XnioExecutor getAcceptThread() {
return getIoThread();
}
void handleReady() {
final SocketChannel accepted;
try {
accepted = channel.accept();
if(suspendedDueToWatermark) {
IoUtils.safeClose(accepted);
return;
}
} catch (IOException e) {
tcpServerLog.logf(FQCN, Logger.Level.ERROR, e, "Exception accepting request, closing server channel %s", this);
IoUtils.safeClose(channel);
return;
}
try {
boolean ok = false;
if (accepted != null) try {
final SocketAddress localAddress = accepted.getLocalAddress();
int hash;
if (localAddress instanceof InetSocketAddress) {
final InetSocketAddress address = (InetSocketAddress) localAddress;
hash = address.getAddress().hashCode() * 23 + address.getPort();
} else if (localAddress instanceof LocalSocketAddress) {
hash = ((LocalSocketAddress) localAddress).getName().hashCode();
} else {
hash = localAddress.hashCode();
}
final SocketAddress remoteAddress = accepted.getRemoteAddress();
if (remoteAddress instanceof InetSocketAddress) {
final InetSocketAddress address = (InetSocketAddress) remoteAddress;
hash = (address.getAddress().hashCode() * 23 + address.getPort()) * 23 + hash;
} else if (remoteAddress instanceof LocalSocketAddress) {
hash = ((LocalSocketAddress) remoteAddress).getName().hashCode() * 23 + hash;
} else {
hash = localAddress.hashCode() * 23 + hash;
}
accepted.configureBlocking(false);
final Socket socket = accepted.socket();
socket.setKeepAlive(keepAlive != 0);
socket.setOOBInline(oobInline != 0);
socket.setTcpNoDelay(tcpNoDelay != 0);
final int sendBuffer = this.sendBuffer;
if (sendBuffer > 0) socket.setSendBufferSize(sendBuffer);
final WorkerThread ioThread = worker.getIoThread(hash);
ok = true;
final int number = ioThread.getNumber();
final BlockingQueue queue = acceptQueues.get(number);
queue.add(accepted);
// todo: only execute if necessary
ioThread.execute(acceptTask);
openConnections++;
if(openConnections >= getHighWater(connectionStatus)) {
synchronized (QueuedNioTcpServer.this) {
suspendedDueToWatermark = true;
}
}
} finally {
if (! ok) safeClose(accepted);
}
} catch (IOException ignored) {
}
}
public void connectionClosed() {
thread.execute(connectionClosedTask);
}
}
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