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MuxServerSocketChannelFactory.java
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MuxServerSocketChannelFactory.java
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/*
* ice4j, the OpenSource Java Solution for NAT and Firewall Traversal.
* Maintained by the SIP Communicator community (http://sip-communicator.org).
*
* Distributable under LGPL license. See terms of license at gnu.org.
*/
package org.ice4j.socket;
import java.io.*;
import java.lang.reflect.*;
import java.net.*;
import java.nio.channels.*;
import java.util.*;
import java.util.logging.*;
/**
* If supported by the runtime, initializes {@link ServerSocketChannel}s which
* are capable of sharing their listening endpoints with multiple others like
* them.
*
* @author Lyubomir Marinov
*/
public class MuxServerSocketChannelFactory
{
/**
* The {@code Logger} used by the {@code MuxServerSocketChannelFactory}
* class (and its instances) to print debug information.
*/
private static final Logger logger
= Logger.getLogger(MuxServerSocketChannelFactory.class.getName());
/**
* The reflection of the {@code openAndBind} method of the
* {@code MuxServerSocketChannel} class.
*/
private static final Method OPEN_AND_BIND_METHOD;
/**
* The maximum number of milliseconds to wait for an accepted
* {@code SocketChannel} to provide incoming/readable data before it is
* considered abandoned by the client.
*/
public static final int SOCKET_CHANNEL_READ_TIMEOUT = 15 * 1000;
/**
* The name of the {@code boolean} property of the {@code socket} property
* of the {@code ServerSocketChannel} returned by {@link #openAndBind(Map,
* SocketAddress, int, DatagramPacketFilter)} which specifies the value of
* the {@code SO_REUSEADDR} socket option.
*/
public static final String SOCKET_REUSE_ADDRESS_PROPERTY_NAME
= "socket.reuseAddress";
static
{
Class<?> clazz;
try
{
clazz
= Class.forName("org.ice4j.socket.jdk8.MuxServerSocketChannel");
}
catch (ClassNotFoundException cnfex)
{
// The class cannot be located probably because ICE4J was not built
// on JDK 8.
clazz = null;
logger.warning(
"ICE4J does not support sharing of listening endpoints"
+ " (probably because it was not built on JDK 8).");
}
catch (LinkageError lerr)
{
// The linkage fails probably because ICE4J was built on JDK 8 but
// is not run on JDK 8.
clazz = null;
logger.warning(
"ICE4J does not support sharing of listening endpoints"
+ " (probably because it is not running on JDK 8).");
}
Method method;
if (clazz == null)
{
method = null;
}
else
{
try
{
method
= clazz.getDeclaredMethod(
"openAndBind",
Map.class,
SocketAddress.class,
int.class,
DatagramPacketFilter.class);
}
catch (NoSuchMethodException nsmex)
{
throw new RuntimeException(nsmex);
}
}
OPEN_AND_BIND_METHOD = method;
}
/**
* Closes a {@code Channel} and swallows any {@link IOException}.
*
* @param channel the {@code Channel} to close
*/
public static void closeNoExceptions(Channel channel)
{
try
{
channel.close();
}
catch (IOException ioe)
{
}
}
/**
* Opens and binds a new {@code MuxServerSocketChannel} instance if
* supported by the runtime. If there are other (existing)
* {@code MuxServerSocketChannel} open and bound on the specified listening
* {@code endpoint}, the new instance will share it with them. If the
* sharing of listening endpoints is not supported by the runtime, falls
* back to {@link #openAndBindServerSocketChannel(Map, SocketAddress, int)}.
*
* @param properties a {@code Map} of the values to be assigned to
* properties of the underlying {@link ServerSocketChannel} which is to
* actually listen on the specified {@code endpoint}. If the new instance is
* not the first to open and bind the specified {@code endpoint}, the
* {@code properties} and their respective values may not be used.
* @param endpoint the IP and port the new instance is to bind to
* @param backlog the requested maximum number of pending incoming
* connections to be queued. If the new instance is not the first to open
* and bind the specified {@code endpoint}, the value may not be used.
* @param filter the {@code DatagramPacketFilter} to demultiplex (i.e.
* recognize) the content meant for the new instance
* @return a new {@code MuxServerSocketChannel} instance open and bound on
* the specified listening {@code endpoint}
* @throws IOException if an I/O error occurs
*/
public static ServerSocketChannel openAndBindMuxServerSocketChannel(
Map<String,Object> properties,
SocketAddress endpoint,
int backlog,
DatagramPacketFilter filter)
throws IOException
{
Method method = OPEN_AND_BIND_METHOD;
if (method == null)
{
return
openAndBindServerSocketChannel(properties, endpoint, backlog);
}
else
{
try
{
return
(ServerSocketChannel)
method.invoke(
null,
properties, endpoint, backlog, filter);
}
catch (IllegalAccessException iaex)
{
IllegalAccessError iaerr
= new IllegalAccessError(iaex.getMessage());
iaerr.initCause(iaex);
throw iaerr;
}
catch (InvocationTargetException itex)
{
Throwable cause = itex.getCause();
if (cause == null)
throw new RuntimeException(itex);
else if (cause instanceof Error)
throw (Error) cause;
else if (cause instanceof IOException)
throw (IOException) cause;
else if (cause instanceof RuntimeException)
throw (RuntimeException) cause;
else
throw new RuntimeException(cause);
}
}
}
/**
* Opens and binds a new {@code ServerSocketChannel} instance.
*
* @param properties a {@code Map} of the values to be assigned to
* properties of the underlying {@link ServerSocketChannel} which is to
* actually listen on the specified {@code endpoint}. If the new instance is
* not the first to open and bind the specified {@code endpoint}, the
* {@code properties} and their respective values may not be used.
* @param endpoint the IP and port the new instance is to bind to
* @param backlog the requested maximum number of pending incoming
* connections to be queued. If the new instance is not the first to open
* and bind the specified {@code endpoint}, the value may not be used.
* @return a new {@code ServerSocketChannel} instance open and bound on the
* specified listening {@code endpoint}
* @throws IOException if an I/O error occurs
*/
public static ServerSocketChannel openAndBindServerSocketChannel(
Map<String,Object> properties,
SocketAddress endpoint,
int backlog)
throws IOException
{
ServerSocketChannel channel = ServerSocketChannel.open();
// Apply the specified properties.
ServerSocket socket = channel.socket();
if (properties != null && !properties.isEmpty())
{
for (Map.Entry<String,Object> property
: properties.entrySet())
{
String name = property.getKey();
if (SOCKET_REUSE_ADDRESS_PROPERTY_NAME.equals(name))
{
Object value = property.getValue();
boolean on;
if (value == null)
on = false;
else if (value instanceof Boolean)
on = ((Boolean) value).booleanValue();
else
on = Boolean.valueOf(value.toString());
socket.setReuseAddress(on);
}
}
}
socket.bind(endpoint, backlog);
return channel;
}
}