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The core jetty server artifact.
//
// ========================================================================
// Copyright (c) 1995-2019 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.server;
import java.io.Closeable;
import java.io.IOException;
import java.net.BindException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.nio.channels.Channel;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.EventListener;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.io.ChannelEndPoint;
import org.eclipse.jetty.io.Connection;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.io.ManagedSelector;
import org.eclipse.jetty.io.SelectorManager;
import org.eclipse.jetty.io.SocketChannelEndPoint;
import org.eclipse.jetty.util.annotation.ManagedAttribute;
import org.eclipse.jetty.util.annotation.ManagedObject;
import org.eclipse.jetty.util.annotation.Name;
import org.eclipse.jetty.util.ssl.SslContextFactory;
import org.eclipse.jetty.util.thread.Scheduler;
/**
* This {@link Connector} implementation is the primary connector for the
* Jetty server over TCP/IP. By the use of various {@link ConnectionFactory} instances it is able
* to accept connections for HTTP, HTTP/2 and WebSocket, either directly or over SSL.
*
* The connector is a fully asynchronous NIO based implementation that by default will
* use all the commons services (eg {@link Executor}, {@link Scheduler}) of the
* passed {@link Server} instance, but all services may also be constructor injected
* into the connector so that it may operate with dedicated or otherwise shared services.
*
* Connection Factories
*
* Various convenience constructors are provided to assist with common configurations of
* ConnectionFactories, whose generic use is described in {@link AbstractConnector}.
* If no connection factories are passed, then the connector will
* default to use a {@link HttpConnectionFactory}. If an non null {@link SslContextFactory}
* instance is passed, then this used to instantiate a {@link SslConnectionFactory} which is
* prepended to the other passed or default factories.
*
* Selectors
*
* The default number of selectors is equal to half of the number of processors available to the JVM,
* which should allow optimal performance even if all the connections used are performing
* significant non-blocking work in the callback tasks.
*
*/
@ManagedObject("HTTP connector using NIO ByteChannels and Selectors")
public class ServerConnector extends AbstractNetworkConnector
{
private final SelectorManager _manager;
private final AtomicReference _acceptor = new AtomicReference<>();
private volatile ServerSocketChannel _acceptChannel;
private volatile boolean _inheritChannel = false;
private volatile int _localPort = -1;
private volatile int _acceptQueueSize = 0;
private volatile boolean _reuseAddress = true;
/**
* Construct a ServerConnector with a private instance of {@link HttpConnectionFactory} as the only factory.
*
* @param server The {@link Server} this connector will accept connection for.
*/
public ServerConnector(
@Name("server") Server server)
{
this(server, null, null, null, -1, -1, new HttpConnectionFactory());
}
/**
* Construct a ServerConnector with a private instance of {@link HttpConnectionFactory} as the only factory.
*
* @param server The {@link Server} this connector will accept connection for.
* @param acceptors the number of acceptor threads to use, or -1 for a default value. Acceptors accept new TCP/IP connections. If 0, then
* the selector threads are used to accept connections.
* @param selectors the number of selector threads, or <=0 for a default value. Selectors notice and schedule established connection that can make IO progress.
*/
public ServerConnector(
@Name("server") Server server,
@Name("acceptors") int acceptors,
@Name("selectors") int selectors)
{
this(server, null, null, null, acceptors, selectors, new HttpConnectionFactory());
}
/**
* Construct a ServerConnector with a private instance of {@link HttpConnectionFactory} as the only factory.
*
* @param server The {@link Server} this connector will accept connection for.
* @param acceptors the number of acceptor threads to use, or -1 for a default value. Acceptors accept new TCP/IP connections. If 0, then
* the selector threads are used to accept connections.
* @param selectors the number of selector threads, or <=0 for a default value. Selectors notice and schedule established connection that can make IO progress.
* @param factories Zero or more {@link ConnectionFactory} instances used to create and configure connections.
*/
public ServerConnector(
@Name("server") Server server,
@Name("acceptors") int acceptors,
@Name("selectors") int selectors,
@Name("factories") ConnectionFactory... factories)
{
this(server, null, null, null, acceptors, selectors, factories);
}
/**
* Construct a Server Connector with the passed Connection factories.
*
* @param server The {@link Server} this connector will accept connection for.
* @param factories Zero or more {@link ConnectionFactory} instances used to create and configure connections.
*/
public ServerConnector(
@Name("server") Server server,
@Name("factories") ConnectionFactory... factories)
{
this(server, null, null, null, -1, -1, factories);
}
/**
* Construct a ServerConnector with a private instance of {@link HttpConnectionFactory} as the primary protocol
.
*
* @param server The {@link Server} this connector will accept connection for.
* @param sslContextFactory If non null, then a {@link SslConnectionFactory} is instantiated and prepended to the
* list of HTTP Connection Factory.
*/
public ServerConnector(
@Name("server") Server server,
@Name("sslContextFactory") SslContextFactory.Server sslContextFactory)
{
this(server, null, null, null, -1, -1, AbstractConnectionFactory.getFactories(sslContextFactory, new HttpConnectionFactory()));
}
/**
* Construct a ServerConnector with a private instance of {@link HttpConnectionFactory} as the primary protocol
.
*
* @param server The {@link Server} this connector will accept connection for.
* @param sslContextFactory If non null, then a {@link SslConnectionFactory} is instantiated and prepended to the
* list of HTTP Connection Factory.
* @param acceptors the number of acceptor threads to use, or -1 for a default value. Acceptors accept new TCP/IP connections. If 0, then
* the selector threads are used to accept connections.
* @param selectors the number of selector threads, or <=0 for a default value. Selectors notice and schedule established connection that can make IO progress.
*/
public ServerConnector(
@Name("server") Server server,
@Name("acceptors") int acceptors,
@Name("selectors") int selectors,
@Name("sslContextFactory") SslContextFactory.Server sslContextFactory)
{
this(server, null, null, null, acceptors, selectors, AbstractConnectionFactory.getFactories(sslContextFactory, new HttpConnectionFactory()));
}
/**
* @param server The {@link Server} this connector will accept connection for.
* @param sslContextFactory If non null, then a {@link SslConnectionFactory} is instantiated and prepended to the
* list of ConnectionFactories, with the first factory being the default protocol for the SslConnectionFactory.
* @param factories Zero or more {@link ConnectionFactory} instances used to create and configure connections.
*/
public ServerConnector(
@Name("server") Server server,
@Name("sslContextFactory") SslContextFactory.Server sslContextFactory,
@Name("factories") ConnectionFactory... factories)
{
this(server, null, null, null, -1, -1, AbstractConnectionFactory.getFactories(sslContextFactory, factories));
}
/**
* @param server The server this connector will be accept connection for.
* @param executor An executor used to run tasks for handling requests, acceptors and selectors.
* If null then use the servers executor
* @param scheduler A scheduler used to schedule timeouts. If null then use the servers scheduler
* @param bufferPool A ByteBuffer pool used to allocate buffers. If null then create a private pool with default configuration.
* @param acceptors the number of acceptor threads to use, or -1 for a default value. Acceptors accept new TCP/IP connections. If 0, then
* the selector threads are used to accept connections.
* @param selectors the number of selector threads, or <=0 for a default value. Selectors notice and schedule established connection that can make IO progress.
* @param factories Zero or more {@link ConnectionFactory} instances used to create and configure connections.
*/
public ServerConnector(
@Name("server") Server server,
@Name("executor") Executor executor,
@Name("scheduler") Scheduler scheduler,
@Name("bufferPool") ByteBufferPool bufferPool,
@Name("acceptors") int acceptors,
@Name("selectors") int selectors,
@Name("factories") ConnectionFactory... factories)
{
super(server, executor, scheduler, bufferPool, acceptors, factories);
_manager = newSelectorManager(getExecutor(), getScheduler(), selectors);
addBean(_manager, true);
setAcceptorPriorityDelta(-2);
}
protected SelectorManager newSelectorManager(Executor executor, Scheduler scheduler, int selectors)
{
return new ServerConnectorManager(executor, scheduler, selectors);
}
@Override
protected void doStart() throws Exception
{
for (EventListener l : getBeans(EventListener.class))
{
_manager.addEventListener(l);
}
super.doStart();
if (getAcceptors() == 0)
{
_acceptChannel.configureBlocking(false);
_acceptor.set(_manager.acceptor(_acceptChannel));
}
}
@Override
protected void doStop() throws Exception
{
super.doStop();
for (EventListener l : getBeans(EventListener.class))
{
_manager.removeEventListener(l);
}
}
@Override
public boolean isOpen()
{
ServerSocketChannel channel = _acceptChannel;
return channel != null && channel.isOpen();
}
/**
* @return whether this connector uses a channel inherited from the JVM.
* @see System#inheritedChannel()
*/
public boolean isInheritChannel()
{
return _inheritChannel;
}
/**
* Sets whether this connector uses a channel inherited from the JVM.
* If true, the connector first tries to inherit from a channel provided by the system.
* If there is no inherited channel available, or if the inherited channel is not usable,
* then it will fall back using {@link ServerSocketChannel}.
* Use it with xinetd/inetd, to launch an instance of Jetty on demand. The port
* used to access pages on the Jetty instance is the same as the port used to
* launch Jetty.
*
* @param inheritChannel whether this connector uses a channel inherited from the JVM.
* @see ServerConnector#openAcceptChannel()
*/
public void setInheritChannel(boolean inheritChannel)
{
_inheritChannel = inheritChannel;
}
/**
* Open the connector using the passed ServerSocketChannel.
* This open method can be called before starting the connector to pass it a ServerSocketChannel
* that will be used instead of one returned from {@link #openAcceptChannel()}
*
* @param acceptChannel the channel to use
* @throws IOException if the server channel is not bound
*/
public void open(ServerSocketChannel acceptChannel) throws IOException
{
if (isStarted())
throw new IllegalStateException(getState());
updateBean(_acceptChannel, acceptChannel);
_acceptChannel = acceptChannel;
_localPort = _acceptChannel.socket().getLocalPort();
if (_localPort <= 0)
throw new IOException("Server channel not bound");
}
@Override
public void open() throws IOException
{
if (_acceptChannel == null)
{
_acceptChannel = openAcceptChannel();
_acceptChannel.configureBlocking(true);
_localPort = _acceptChannel.socket().getLocalPort();
if (_localPort <= 0)
throw new IOException("Server channel not bound");
addBean(_acceptChannel);
}
}
/**
* Called by {@link #open()} to obtain the accepting channel.
*
* @return ServerSocketChannel used to accept connections.
* @throws IOException if unable to obtain or configure the server channel
*/
protected ServerSocketChannel openAcceptChannel() throws IOException
{
ServerSocketChannel serverChannel = null;
if (isInheritChannel())
{
Channel channel = System.inheritedChannel();
if (channel instanceof ServerSocketChannel)
serverChannel = (ServerSocketChannel)channel;
else
LOG.warn("Unable to use System.inheritedChannel() [{}]. Trying a new ServerSocketChannel at {}:{}", channel, getHost(), getPort());
}
if (serverChannel == null)
{
serverChannel = ServerSocketChannel.open();
InetSocketAddress bindAddress = getHost() == null ? new InetSocketAddress(getPort()) : new InetSocketAddress(getHost(), getPort());
serverChannel.socket().setReuseAddress(getReuseAddress());
try
{
serverChannel.socket().bind(bindAddress, getAcceptQueueSize());
}
catch (BindException e)
{
throw new IOException("Failed to bind to " + bindAddress, e);
}
}
return serverChannel;
}
@Override
public void close()
{
super.close();
ServerSocketChannel serverChannel = _acceptChannel;
_acceptChannel = null;
if (serverChannel != null)
{
removeBean(serverChannel);
if (serverChannel.isOpen())
{
try
{
serverChannel.close();
}
catch (IOException e)
{
LOG.warn(e);
}
}
}
_localPort = -2;
}
@Override
public void accept(int acceptorID) throws IOException
{
ServerSocketChannel serverChannel = _acceptChannel;
if (serverChannel != null && serverChannel.isOpen())
{
SocketChannel channel = serverChannel.accept();
accepted(channel);
}
}
private void accepted(SocketChannel channel) throws IOException
{
channel.configureBlocking(false);
Socket socket = channel.socket();
configure(socket);
_manager.accept(channel);
}
protected void configure(Socket socket)
{
try
{
socket.setTcpNoDelay(true);
}
catch (SocketException e)
{
LOG.ignore(e);
}
}
@ManagedAttribute("The Selector Manager")
public SelectorManager getSelectorManager()
{
return _manager;
}
@Override
public Object getTransport()
{
return _acceptChannel;
}
@Override
@ManagedAttribute("local port")
public int getLocalPort()
{
return _localPort;
}
protected ChannelEndPoint newEndPoint(SocketChannel channel, ManagedSelector selectSet, SelectionKey key) throws IOException
{
SocketChannelEndPoint endpoint = new SocketChannelEndPoint(channel, selectSet, key, getScheduler());
endpoint.setIdleTimeout(getIdleTimeout());
return endpoint;
}
/**
* @return the accept queue size
*/
@ManagedAttribute("Accept Queue size")
public int getAcceptQueueSize()
{
return _acceptQueueSize;
}
/**
* @param acceptQueueSize the accept queue size (also known as accept backlog)
*/
public void setAcceptQueueSize(int acceptQueueSize)
{
_acceptQueueSize = acceptQueueSize;
}
/**
* @return whether the server socket reuses addresses
* @see ServerSocket#getReuseAddress()
*/
public boolean getReuseAddress()
{
return _reuseAddress;
}
/**
* @param reuseAddress whether the server socket reuses addresses
* @see ServerSocket#setReuseAddress(boolean)
*/
public void setReuseAddress(boolean reuseAddress)
{
_reuseAddress = reuseAddress;
}
@Override
public void setAccepting(boolean accepting)
{
super.setAccepting(accepting);
if (getAcceptors() > 0)
return;
try
{
if (accepting)
{
if (_acceptor.get() == null)
{
Closeable acceptor = _manager.acceptor(_acceptChannel);
if (!_acceptor.compareAndSet(null, acceptor))
acceptor.close();
}
}
else
{
Closeable acceptor = _acceptor.get();
if (acceptor != null && _acceptor.compareAndSet(acceptor, null))
acceptor.close();
}
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
protected class ServerConnectorManager extends SelectorManager
{
public ServerConnectorManager(Executor executor, Scheduler scheduler, int selectors)
{
super(executor, scheduler, selectors);
}
@Override
protected void accepted(SelectableChannel channel) throws IOException
{
ServerConnector.this.accepted((SocketChannel)channel);
}
@Override
protected ChannelEndPoint newEndPoint(SelectableChannel channel, ManagedSelector selectSet, SelectionKey selectionKey) throws IOException
{
return ServerConnector.this.newEndPoint((SocketChannel)channel, selectSet, selectionKey);
}
@Override
public Connection newConnection(SelectableChannel channel, EndPoint endpoint, Object attachment) throws IOException
{
return getDefaultConnectionFactory().newConnection(ServerConnector.this, endpoint);
}
@Override
protected void endPointOpened(EndPoint endpoint)
{
super.endPointOpened(endpoint);
onEndPointOpened(endpoint);
}
@Override
protected void endPointClosed(EndPoint endpoint)
{
onEndPointClosed(endpoint);
super.endPointClosed(endpoint);
}
@Override
public String toString()
{
return String.format("SelectorManager@%s", ServerConnector.this);
}
}
}