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The NIO implementation of the XNIO project
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2012 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketAddress;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.SelectionKey;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import org.jboss.logging.Logger;
import org.xnio.ChannelListener;
import org.xnio.ManagementRegistration;
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 NioTcpServer extends AbstractNioChannel implements AcceptingChannel, AcceptListenerSettable {
private static final String FQCN = NioTcpServer.class.getName();
private volatile ChannelListener acceptListener;
private final NioTcpServerHandle[] handles;
private final ServerSocketChannel channel;
private final ServerSocket socket;
private final ManagementRegistration mbeanHandle;
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 volatile int tokenConnectionCount;
volatile boolean resumed;
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;
private static final AtomicIntegerFieldUpdater keepAliveUpdater = AtomicIntegerFieldUpdater.newUpdater(NioTcpServer.class, "keepAlive");
private static final AtomicIntegerFieldUpdater oobInlineUpdater = AtomicIntegerFieldUpdater.newUpdater(NioTcpServer.class, "oobInline");
private static final AtomicIntegerFieldUpdater tcpNoDelayUpdater = AtomicIntegerFieldUpdater.newUpdater(NioTcpServer.class, "tcpNoDelay");
private static final AtomicIntegerFieldUpdater sendBufferUpdater = AtomicIntegerFieldUpdater.newUpdater(NioTcpServer.class, "sendBuffer");
private static final AtomicIntegerFieldUpdater readTimeoutUpdater = AtomicIntegerFieldUpdater.newUpdater(NioTcpServer.class, "readTimeout");
private static final AtomicIntegerFieldUpdater writeTimeoutUpdater = AtomicIntegerFieldUpdater.newUpdater(NioTcpServer.class, "writeTimeout");
private static final AtomicLongFieldUpdater connectionStatusUpdater = AtomicLongFieldUpdater.newUpdater(NioTcpServer.class, "connectionStatus");
NioTcpServer(final NioXnioWorker worker, final ServerSocketChannel channel, final OptionMap optionMap, final boolean useAcceptThreadOnly) throws IOException {
super(worker);
this.channel = channel;
final WorkerThread[] threads;
final int threadCount;
final int tokens;
final int connections;
if (useAcceptThreadOnly) {
threads = new WorkerThread[] { worker.getAcceptThread() };
threadCount = 1;
tokens = 0;
connections = 0;
} else {
threads = worker.getAll();
threadCount = threads.length;
if (threadCount == 0) {
throw log.noThreads();
}
tokens = optionMap.get(Options.BALANCING_TOKENS, -1);
connections = optionMap.get(Options.BALANCING_CONNECTIONS, 16);
if (tokens != -1) {
if (tokens < 1 || tokens >= threadCount) {
throw log.balancingTokens();
}
if (connections < 1) {
throw log.balancingConnectionCount();
}
tokenConnectionCount = connections;
}
}
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));
}
int perThreadLow, perThreadLowRem;
int perThreadHigh, perThreadHighRem;
if (optionMap.contains(Options.CONNECTION_HIGH_WATER) || optionMap.contains(Options.CONNECTION_LOW_WATER)) {
final int highWater = optionMap.get(Options.CONNECTION_HIGH_WATER, Integer.MAX_VALUE);
final int 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);
perThreadLow = lowWater / threadCount;
perThreadLowRem = lowWater % threadCount;
perThreadHigh = highWater / threadCount;
perThreadHighRem = highWater % threadCount;
} else {
perThreadLow = Integer.MAX_VALUE;
perThreadLowRem = 0;
perThreadHigh = Integer.MAX_VALUE;
perThreadHighRem = 0;
connectionStatusUpdater.lazySet(this, CONN_LOW_MASK | CONN_HIGH_MASK);
}
final NioTcpServerHandle[] handles = new NioTcpServerHandle[threadCount];
for (int i = 0, length = threadCount; i < length; i++) {
final SelectionKey key = threads[i].registerChannel(channel);
handles[i] = new NioTcpServerHandle(this, key, threads[i], i < perThreadLowRem ? perThreadLow + 1 : perThreadLow, i < perThreadHighRem ? perThreadHigh + 1 : perThreadHigh);
key.attach(handles[i]);
}
this.handles = handles;
if (tokens > 0) {
for (int i = 0; i < threadCount; i ++) {
handles[i].initializeTokenCount(i < tokens ? connections : 0);
}
}
mbeanHandle = worker.registerServerMXBean(
new XnioServerMXBean() {
public String getProviderName() {
return "nio";
}
public String getWorkerName() {
return worker.getName();
}
public String getBindAddress() {
return String.valueOf(getLocalAddress());
}
public int getConnectionCount() {
final AtomicInteger counter = new AtomicInteger();
final CountDownLatch latch = new CountDownLatch(handles.length);
for (final NioTcpServerHandle handle : handles) {
handle.getWorkerThread().execute(() -> {
counter.getAndAdd(handle.getConnectionCount());
latch.countDown();
});
}
try {
latch.await();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
return counter.get();
}
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 {
for (NioTcpServerHandle handle : handles) {
handle.cancelKey(true);
}
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));
final NioTcpServerHandle[] conduits = handles;
final int threadCount = conduits.length;
int perThreadLow, perThreadLowRem;
int perThreadHigh, perThreadHighRem;
perThreadLow = newLowWater / threadCount;
perThreadLowRem = newLowWater % threadCount;
perThreadHigh = newHighWater / threadCount;
perThreadHighRem = newHighWater % threadCount;
for (int i = 0; i < conduits.length; i++) {
NioTcpServerHandle conduit = conduits[i];
conduit.executeSetTask(i < perThreadHighRem ? perThreadHigh + 1 : perThreadHigh, i < perThreadLowRem ? perThreadLow + 1 : perThreadLow);
}
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 ClosedChannelException {
final WorkerThread current = WorkerThread.getCurrent();
if (current == null) {
return null;
}
final NioTcpServerHandle handle;
if (handles.length == 1) {
handle = handles[0];
} else {
handle = handles[current.getNumber()];
}
if (! handle.getConnection()) {
return null;
}
final SocketChannel accepted;
boolean ok = false;
try {
accepted = channel.accept();
if (accepted != null) try {
int hash = ThreadLocalRandom.current().nextInt();
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);
final SelectionKey selectionKey = ioThread.registerChannel(accepted);
final NioSocketStreamConnection newConnection = new NioSocketStreamConnection(ioThread, selectionKey, handle);
newConnection.setOption(Options.READ_TIMEOUT, Integer.valueOf(readTimeout));
newConnection.setOption(Options.WRITE_TIMEOUT, Integer.valueOf(writeTimeout));
ok = true;
handle.resetBackOff();
return newConnection;
} finally {
if (! ok) safeClose(accepted);
}
} catch (ClosedChannelException e) {
throw e;
} catch (IOException e) {
// something went wrong with the accept
// it could be due to running out of file descriptors, or due to closed channel, or other things
handle.startBackOff();
log.acceptFailed(e, handle.getBackOffTime());
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 AcceptListenerSettable.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() {
resumed = false;
doResume(0);
}
public void resumeAccepts() {
resumed = true;
doResume(SelectionKey.OP_ACCEPT);
}
public boolean isAcceptResumed() {
return resumed;
}
private void doResume(final int op) {
if (op == 0) {
for (NioTcpServerHandle handle : handles) {
handle.suspend();
}
} else {
for (NioTcpServerHandle handle : handles) {
handle.resume();
}
}
}
public void wakeupAccepts() {
tcpServerLog.logf(FQCN, Logger.Level.TRACE, null, "Wake up accepts on %s", this);
resumeAccepts();
final NioTcpServerHandle[] handles = this.handles;
final int idx = IoUtils.getThreadLocalRandom().nextInt(handles.length);
handles[idx].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();
}
NioTcpServerHandle getHandle(final int number) {
return handles[number];
}
int getTokenConnectionCount() {
return tokenConnectionCount;
}
}