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	/*
	* Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package com.sun.nio.sctp;

	import java.net.SocketAddress;
	import java.net.InetAddress;
	import java.io.IOException;
	import java.util.Set;
	import java.nio.ByteBuffer;
	import java.nio.channels.spi.AbstractSelectableChannel;
	import java.nio.channels.spi.SelectorProvider;
	import java.nio.channels.ClosedChannelException;
	import java.nio.channels.NotYetBoundException;
	import java.nio.channels.SelectionKey;

	/**
	* A selectable channel for message-oriented SCTP sockets.
	*
	* <P> An SCTP multi channel supports many associations on a single socket.
	* An {@code SctpMultiChannel} is created by invoking the
	* {@link #open open} method of this class. A newly-created channel is open but
	* not yet bound. An attempt to invoke the {@link #receive receive} method of an
	* unbound channel will cause the {@link NotYetBoundException}
	* to be thrown. An attempt to invoke the {@link #send send} method of an
	* unbound channel will cause it to first invoke the {@link #bind bind} method.
	* The address(es) that the channel's socket is bound to can be retrieved by
	* calling {@link #getAllLocalAddresses getAllLocalAddresses}.
	*
	* <P> Messages may be sent and received without explicitly setting up an
	* association with the remote peer. The channel will implicitly setup
	* a new association whenever it sends or receives a message from a remote
	* peer if there is not already an association with that peer. Upon successful
	* association setup, an {@link AssociationChangeNotification
	* association changed} notification will be put to the SCTP stack with its
	* {@code event} parameter set to {@link
	* AssociationChangeNotification.AssocChangeEvent#COMM_UP
	* COMM_UP}. This notification can be received by invoking {@link #receive
	* receive}.
	*
	* <P> Socket options are configured using the
	* {@link #setOption(SctpSocketOption,Object,Association) setOption} method. An
	* {@code SctpMultiChannel} supports the following options:
	* <blockquote>
	* <table border summary="Socket options">
	* <tr>
	* <th>Option Name</th>
	* <th>Description</th>
	* </tr>
	* <tr>
	* <td> {@link SctpStandardSocketOptions#SCTP_DISABLE_FRAGMENTS
	* SCTP_DISABLE_FRAGMENTS} </td>
	* <td> Enables or disables message fragmentation </td>
	* </tr>
	* <tr>
	* <td> {@link SctpStandardSocketOptions#SCTP_EXPLICIT_COMPLETE
	* SCTP_EXPLICIT_COMPLETE} </td>
	* <td> Enables or disables explicit message completion </td>
	* </tr>
	* <tr>
	* <td> {@link SctpStandardSocketOptions#SCTP_FRAGMENT_INTERLEAVE
	* SCTP_FRAGMENT_INTERLEAVE} </td>
	* <td> Controls how the presentation of messages occur for the message
	* receiver </td>
	* </tr>
	* <tr>
	* <td> {@link SctpStandardSocketOptions#SCTP_INIT_MAXSTREAMS
	* SCTP_INIT_MAXSTREAMS} </td>
	* <td> The maximum number of streams requested by the local endpoint during
	* association initialization </td>
	* </tr>
	* <tr>
	* <td> {@link SctpStandardSocketOptions#SCTP_NODELAY SCTP_NODELAY} </td>
	* <td> Enables or disable a Nagle-like algorithm </td>
	* </tr>
	* <tr>
	* <td> {@link SctpStandardSocketOptions#SCTP_PRIMARY_ADDR
	* SCTP_PRIMARY_ADDR} </td>
	* <td> Requests that the local SCTP stack use the given peer address as the
	* association primary </td>
	* </tr>
	* <tr>
	* <td> {@link SctpStandardSocketOptions#SCTP_SET_PEER_PRIMARY_ADDR
	* SCTP_SET_PEER_PRIMARY_ADDR} </td>
	* <td> Requests that the peer mark the enclosed address as the association
	* primary </td>
	* </tr>
	* <tr>
	* <td> {@link SctpStandardSocketOptions#SO_SNDBUF
	* SO_SNDBUF} </td>
	* <td> The size of the socket send buffer </td>
	* </tr>
	* <tr>
	* <td> {@link SctpStandardSocketOptions#SO_RCVBUF
	* SO_RCVBUF} </td>
	* <td> The size of the socket receive buffer </td>
	* </tr>
	* <tr>
	* <td> {@link SctpStandardSocketOptions#SO_LINGER
	* SO_LINGER} </td>
	* <td> Linger on close if data is present (when configured in blocking mode
	* only) </td>
	* </tr>
	* </table>
	* </blockquote>
	* Additional (implementation specific) options may also be supported. The list
	* of options supported is obtained by invoking the {@link #supportedOptions()
	* supportedOptions} method.
	*
	* <p> SCTP multi channels are safe for use by multiple concurrent threads.
	* They support concurrent sending and receiving, though at most one thread may be
	* sending and at most one thread may be receiving at any given time.
	*
	* @since 1.7
	*/
	@jdk.Exported
	public abstract class SctpMultiChannel
	extends AbstractSelectableChannel
	{
	/**
	* Initializes a new instance of this class.
	*
	* @param provider
	* The selector provider for this channel
	*/
	protected SctpMultiChannel(SelectorProvider provider) {
	super(provider);
	}

	/**
	* Opens an SCTP multi channel.
	*
	* <P> The new channel is unbound.
	*
	* @return A new SCTP multi channel
	*
	* @throws UnsupportedOperationException
	* If the SCTP protocol is not supported
	*
	* @throws IOException
	* If an I/O error occurs
	*/
	public static SctpMultiChannel open() throws
	IOException {
	return new sun.nio.ch.sctp.SctpMultiChannelImpl((SelectorProvider)null);
	}

	/**
	* Returns the open associations on this channel's socket.
	*
	* <P> Only associations whose {@link AssociationChangeNotification.AssocChangeEvent#COMM_UP
	* COMM_UP} association change event has been received are included
	* in the returned set of associations. Associations for which a
	* {@link AssociationChangeNotification.AssocChangeEvent#COMM_LOST COMM_LOST} or {@link
	* AssociationChangeNotification.AssocChangeEvent#SHUTDOWN SHUTDOWN} association change
	* event have been receive are removed from the set of associations.
	*
	* <P> The returned set of associations is a snapshot of the open
	* associations at the time that this method is invoked.
	*
	* @return A {@code Set} containing the open associations, or an empty
	* {@code Set} if there are none.
	*
	* @throws ClosedChannelException
	* If this channel is closed
	*
	* @throws IOException
	* If some other I/O error occurs
	*/
	public abstract Set<Association> associations()
	throws IOException;

	/**
	* Binds the channel's socket to a local address and configures the socket
	* to listen for connections.
	*
	* <P> This method is used to establish a relationship between the socket
	* and the local address. Once a relationship is established then
	* the socket remains bound until the channel is closed. This relationship
	* may not necesssarily be with the address {@code local} as it may be removed
	* by {@link #unbindAddress unbindAddress}, but there will always be at least one local
	* address bound to the channel's socket once an invocation of this method
	* successfully completes.
	*
	* <P> Once the channel's socket has been successfully bound to a specific
	* address, that is not automatically assigned, more addresses
	* may be bound to it using {@link #bindAddress bindAddress}, or removed
	* using {@link #unbindAddress unbindAddress}.
	*
	* <P> The backlog parameter is the maximum number of pending connections on
	* the socket. Its exact semantics are implementation specific. An implementation
	* may impose an implementation specific maximum length or may choose to ignore
	* the parameter. If the backlog parameter has the value {@code 0}, or a negative
	* value, then an implementation specific default is used.
	*
	* @param local
	* The local address to bind the socket, or {@code null} to
	* bind the socket to an automatically assigned socket address
	*
	* @param backlog
	* The maximum number number of pending connections
	*
	* @return This channel
	*
	* @throws ClosedChannelException
	* If this channel is closed
	*
	* @throws java.nio.channels.AlreadyBoundException
	* If this channel is already bound
	*
	* @throws java.nio.channels.UnsupportedAddressTypeException
	* If the type of the given address is not supported
	*
	* @throws SecurityException
	* If a security manager has been installed and its {@link
	* java.lang.SecurityManager#checkListen(int) checkListen} method
	* denies the operation
	*
	* @throws IOException
	* If some other I/O error occurs
	*/
	public abstract SctpMultiChannel bind(SocketAddress local,
	int backlog)
	throws IOException;

	/**
	* Binds the channel's socket to a local address and configures the socket
	* to listen for connections.
	*
	* <P> This method works as if invoking it were equivalent to evaluating the
	* expression:
	* <blockquote><pre>
	* bind(local, 0);
	* </pre></blockquote>
	*
	* @param local
	* The local address to bind the socket, or {@code null} to
	* bind the socket to an automatically assigned socket address
	*
	* @return This channel
	*
	* @throws ClosedChannelException
	* If this channel is closed
	*
	* @throws java.nio.channels.AlreadyBoundException
	* If this channel is already bound
	*
	* @throws java.nio.channels.UnsupportedAddressTypeException
	* If the type of the given address is not supported
	*
	* @throws SecurityException
	* If a security manager has been installed and its {@link
	* java.lang.SecurityManager#checkListen(int) checkListen} method
	* denies the operation
	*
	* @throws IOException
	* If some other I/O error occurs
	*/
	public final SctpMultiChannel bind(SocketAddress local)
	throws IOException {
	return bind(local, 0);
	}

	/**
	* Adds the given address to the bound addresses for the channel's
	* socket.
	*
	* <P> The given address must not be the {@link
	* java.net.InetAddress#isAnyLocalAddress wildcard} address.
	* The channel must be first bound using {@link #bind bind} before
	* invoking this method, otherwise {@link NotYetBoundException} is thrown.
	* The {@link #bind bind} method takes a {@code SocketAddress} as its
	* argument which typically contains a port number as well as an address.
	* Addresses subquently bound using this method are simply addresses as the
	* SCTP port number remains the same for the lifetime of the channel.
	*
	* <P> New associations setup after this method successfully completes
	* will be associated with the given address. Adding addresses to existing
	* associations is optional functionality. If the endpoint supports
	* dynamic address reconfiguration then it may send the appropriate message
	* to the peer to change the peers address lists.
	*
	* @param address
	* The address to add to the bound addresses for the socket
	*
	* @return This channel
	*
	* @throws ClosedChannelException
	* If this channel is closed
	*
	* @throws NotYetBoundException
	* If this channel is not yet bound
	*
	* @throws java.nio.channels.AlreadyBoundException
	* If this channel is already bound to the given address
	*
	* @throws IllegalArgumentException
	* If address is {@code null} or the {@link
	* java.net.InetAddress#isAnyLocalAddress wildcard} address
	*
	* @throws IOException
	* If some other I/O error occurs
	*/
	public abstract SctpMultiChannel bindAddress(InetAddress address)
	throws IOException;

	/**
	* Removes the given address from the bound addresses for the channel's
	* socket.
	*
	* <P> The given address must not be the {@link
	* java.net.InetAddress#isAnyLocalAddress wildcard} address.
	* The channel must be first bound using {@link #bind bind} before
	* invoking this method, otherwise {@link NotYetBoundException} is thrown.
	*
	* <P> If this method is invoked on a channel that does
	* not have {@code address} as one of its bound addresses, or that has only
	* one local address bound to it, then this method throws
	* {@link IllegalUnbindException}.
	*
	* <P> The initial address that the channel's socket is bound to using
	* {@link #bind bind} may be removed from the bound addresses for the
	* channel's socket.
	*
	* <P> New associations setup after this method successfully completes
	* will not be associated with the given address. Removing addresses from
	* existing associations is optional functionality. If the endpoint supports
	* dynamic address reconfiguration then it may send the appropriate message
	* to the peer to change the peers address lists.
	*
	* @param address
	* The address to remove from the bound addresses for the socket
	*
	* @return This channel
	*
	* @throws ClosedChannelException
	* If this channel is closed
	*
	* @throws NotYetBoundException
	* If this channel is not yet bound
	*
	* @throws IllegalUnbindException
	* {@code address} is not bound to the channel's socket, or the
	* channel has only one address bound to it
	*
	* @throws IllegalArgumentException
	* If address is {@code null} or the {@link
	* java.net.InetAddress#isAnyLocalAddress wildcard} address
	*
	* @throws IOException
	* If some other I/O error occurs
	*/
	public abstract SctpMultiChannel unbindAddress(InetAddress address)
	throws IOException;

	/**
	* Returns all of the socket addresses to which this channel's socket is
	* bound.
	*
	* @return All the socket addresses that this channel's socket is
	* bound to, or an empty {@code Set} if the channel's socket is not
	* bound
	*
	* @throws ClosedChannelException
	* If the channel is closed
	*
	* @throws IOException
	* If an I/O error occurs
	*/
	public abstract Set<SocketAddress> getAllLocalAddresses()
	throws IOException;

	/**
	* Returns all of the remote addresses to which the given association on
	* this channel's socket is connected.
	*
	* @param association
	* The association
	*
	* @return All of the remote addresses for the given association, or
	* an empty {@code Set} if the association has been shutdown
	*
	* @throws ClosedChannelException
	* If the channel is closed
	*
	* @throws IOException
	* If an I/O error occurs
	*/
	public abstract Set<SocketAddress> getRemoteAddresses(Association association)
	throws IOException;

	/**
	* Shutdown an association without closing the channel.
	*
	* @param association
	* The association to shutdown
	*
	* @return This channel
	*
	* @throws ClosedChannelException
	* If this channel is closed
	*
	* @throws IOException
	* If some other I/O error occurs
	*/
	public abstract SctpMultiChannel shutdown(Association association)
	throws IOException;

	/**
	* Returns the value of a socket option.
	*
	* <P> Note that some options are retrieved on the channel's socket,
	* therefore the {@code association} parameter is not applicable and will be
	* ignored if given. However, if the option is association specific then the
	* association must be given.
	*
	* @param <T>
	* The type of the socket option value
	*
	* @param name
	* The socket option
	*
	* @param association
	* The association whose option should be retrieved, or {@code null}
	* if this option should be retrieved at the channel's socket level.
	*
	* @return The value of the socket option. A value of {@code null} may be
	* a valid value for some socket options.
	*
	* @throws UnsupportedOperationException
	* If the socket option is not supported by this channel
	*
	* @throws ClosedChannelException
	* If this channel is closed
	*
	* @throws IOException
	* If an I/O error occurs
	*
	* @see SctpStandardSocketOptions
	*/
	public abstract <T> T getOption(SctpSocketOption<T> name,
	Association association)
	throws IOException;

	/**
	* Sets the value of a socket option.
	*
	* <P> Note that some options are retrieved on the channel's socket,
	* therefore the {@code association} parameter is not applicable and will be
	* ignored if given. However, if the option is association specific then the
	* association must be given.
	*
	* @param <T>
	* The type of the socket option value
	*
	* @param name
	* The socket option
	*
	* @param association
	* The association whose option should be set, or {@code null}
	* if this option should be set at the channel's socket level.
	*
	* @param value
	* The value of the socket option. A value of {@code null} may be
	* a valid value for some socket options.
	*
	* @return This channel
	*
	* @throws UnsupportedOperationException
	* If the socket option is not supported by this channel
	*
	* @throws IllegalArgumentException
	* If the value is not a valid value for this socket option
	*
	* @throws ClosedChannelException
	* If this channel is closed
	*
	* @throws IOException
	* If an I/O error occurs
	*
	* @see SctpStandardSocketOptions
	*/
	public abstract <T> SctpMultiChannel setOption(SctpSocketOption<T> name,
	T value,
	Association association)
	throws IOException;

	/**
	* Returns a set of the socket options supported by this channel.
	*
	* <P> This method will continue to return the set of options even after the
	* channel has been closed.
	*
	* @return A set of the socket options supported by this channel
	*/
	public abstract Set<SctpSocketOption<?>> supportedOptions();

	/**
	* Returns an operation set identifying this channel's supported operations.
	*
	* <P> SCTP multi channels support reading, and writing, so this
	* method returns
	* {@code (}{@link SelectionKey#OP_READ} {@code \|} {@link
	* SelectionKey#OP_WRITE}{@code )}. </p>
	*
	* @return The valid-operation set
	*/
	@Override
	public final int validOps() {
	return (SelectionKey.OP_READ \|
	SelectionKey.OP_WRITE );
	}

	/**
	* Receives a message and/or handles a notification via this channel.
	*
	* <P> If a message or notification is immediately available, or if this
	* channel is in blocking mode and one eventually becomes available, then
	* the message or notification is returned or handled, respectively. If this
	* channel is in non-blocking mode and a message or notification is not
	* immediately available then this method immediately returns {@code null}.
	*
	* <P> If this method receives a message it is copied into the given byte
	* buffer and an {@link MessageInfo} is returned.
	* The message is transferred into the given byte buffer starting at its
	* current position and the buffers position is incremented by the number of
	* bytes read. If there are fewer bytes remaining in the buffer than are
	* required to hold the message, or the underlying input buffer does not
	* contain the complete message, then an invocation of {@link
	* MessageInfo#isComplete isComplete} on the returned {@code
	* MessageInfo} will return {@code false}, and more invocations of this
	* method will be necessary to completely consume the messgae. Only
	* one message at a time will be partially delivered in any stream. The
	* socket option {@link SctpStandardSocketOptions#SCTP_FRAGMENT_INTERLEAVE
	* SCTP_FRAGMENT_INTERLEAVE} controls various aspects of what interlacing of
	* messages occurs.
	*
	* <P> If this method receives a notification then the appropriate method of
	* the given handler, if there is one, is invoked. If the handler returns {@link
	* HandlerResult#CONTINUE CONTINUE} then this method will try to receive another
	* message/notification, otherwise, if {@link HandlerResult#RETURN RETURN} is returned
	* this method will return {@code null}. If an uncaught exception is thrown by the
	* handler it will be propagated up the stack through this method.
	*
	* <P> If a security manager has been installed then for each new association
	* setup this method verifies that the associations source address and port
	* number are permitted by the security manager's {@link
	* java.lang.SecurityManager#checkAccept(String,int) checkAccept} method.
	*
	* <P> This method may be invoked at any time. If another thread has
	* already initiated a receive operation upon this channel, then an
	* invocation of this method will block until the first operation is
	* complete. The given handler is invoked without holding any locks used
	* to enforce the above synchronization policy, that way handlers
	* will not stall other threads from receiving. A handler should not invoke
	* the {@code receive} method of this channel, if it does an
	* {@link IllegalReceiveException} will be thrown.
	*
	* @param <T>
	* The type of the attachment
	*
	* @param buffer
	* The buffer into which bytes are to be transferred
	*
	* @param attachment
	* The object to attach to the receive operation; can be
	* {@code null}
	*
	* @param handler
	* A handler to handle notifications from the SCTP stack, or
	* {@code null} to ignore any notifications.
	*
	* @return The {@code MessageInfo}, {@code null} if this channel is in
	* non-blocking mode and no messages are immediately available or
	* the notification handler returns {@code RETURN} after handling
	* a notification
	*
	* @throws java.nio.channels.ClosedChannelException
	* If this channel is closed
	*
	* @throws java.nio.channels.AsynchronousCloseException
	* If another thread closes this channel
	* while the read operation is in progress
	*
	* @throws java.nio.channels.ClosedByInterruptException
	* If another thread interrupts the current thread
	* while the read operation is in progress, thereby
	* closing the channel and setting the current thread's
	* interrupt status
	*
	* @throws NotYetBoundException
	* If this channel is not yet bound
	*
	* @throws IllegalReceiveException
	* If the given handler invokes the {@code receive} method of this
	* channel
	*
	* @throws SecurityException
	* If a security manager has been installed and it does not permit
	* new associations to be accepted from the message's sender
	*
	* @throws IOException
	* If some other I/O error occurs
	*/
	public abstract <T> MessageInfo receive(ByteBuffer buffer,
	T attachment,
	NotificationHandler<T> handler)
	throws IOException;

	/**
	* Sends a message via this channel.
	*
	* <P> If this channel is unbound then this method will invoke {@link
	* #bind(SocketAddress, int) bind(null, 0)} before sending any data.
	*
	* <P> If there is no association existing between this channel's socket
	* and the intended receiver, identified by the address in the given messageInfo, then one
	* will be automatically setup to the intended receiver. This is considered
	* to be Implicit Association Setup. Upon successful association setup, an
	* {@link AssociationChangeNotification association changed}
	* notification will be put to the SCTP stack with its {@code event} parameter set
	* to {@link AssociationChangeNotification.AssocChangeEvent#COMM_UP COMM_UP}
	* . This notification can be received by invoking {@link #receive
	* receive}.
	*
	* <P> If this channel is in blocking mode, there is sufficient room in the
	* underlying output buffer, then the remaining bytes in the given byte
	* buffer are transmitted as a single message. Sending a message
	* is atomic unless explicit message completion {@link
	* SctpStandardSocketOptions#SCTP_EXPLICIT_COMPLETE SCTP_EXPLICIT_COMPLETE}
	* socket option is enabled on this channel's socket.
	*
	* <P> If this channel is in non-blocking mode, there is sufficient room
	* in the underlying output buffer, and an implicit association setup is
	* required, then the remaining bytes in the given byte buffer are
	* transmitted as a single message, subject to {@link
	* SctpStandardSocketOptions#SCTP_EXPLICIT_COMPLETE SCTP_EXPLICIT_COMPLETE}.
	* If for any reason the message cannot
	* be delivered an {@link AssociationChangeNotification association
	* changed} notification is put on the SCTP stack with its {@code event} parameter set
	* to {@link AssociationChangeNotification.AssocChangeEvent#CANT_START CANT_START}.
	*
	* <P> The message is transferred from the byte buffer as if by a regular
	* {@link java.nio.channels.WritableByteChannel#write(java.nio.ByteBuffer)
	* write} operation.
	*
	* <P> If a security manager has been installed then for each new association
	* setup this method verifies that the given remote peers address and port
	* number are permitted by the security manager's {@link
	* java.lang.SecurityManager#checkConnect(String,int) checkConnect} method.
	*
	* <P> This method may be invoked at any time. If another thread has already
	* initiated a send operation upon this channel, then an invocation of
	* this method will block until the first operation is complete.
	*
	* @param buffer
	* The buffer containing the message to be sent
	*
	* @param messageInfo
	* Ancillary data about the message to be sent
	*
	* @return The number of bytes sent, which will be either the number of
	* bytes that were remaining in the messages buffer when this method
	* was invoked or, if this channel is non-blocking, may be zero if
	* there was insufficient room for the message in the underlying
	* output buffer
	*
	* @throws InvalidStreamException
	* If {@code streamNumber} is negative, or if an association already
	* exists and {@code streamNumber} is greater than the maximum number
	* of outgoing streams
	*
	* @throws java.nio.channels.ClosedChannelException
	* If this channel is closed
	*
	* @throws java.nio.channels.AsynchronousCloseException
	* If another thread closes this channel
	* while the read operation is in progress
	*
	* @throws java.nio.channels.ClosedByInterruptException
	* If another thread interrupts the current thread
	* while the read operation is in progress, thereby
	* closing the channel and setting the current thread's
	* interrupt status
	*
	* @throws SecurityException
	* If a security manager has been installed and it does not permit
	* new associations to be setup with the the messages's address
	*
	* @throws IOException
	* If some other I/O error occurs
	*/
	public abstract int send(ByteBuffer buffer, MessageInfo messageInfo)
	throws IOException;

	/**
	* Branches off an association.
	*
	* <P> An application can invoke this method to branch off an association
	* into a separate channel. The new bound and connected {@link SctpChannel}
	* will be created for the association. The branched off association will no
	* longer be part of this channel.
	*
	* <P> This is particularly useful when, for instance, the application
	* wishes to have a number of sporadic message senders/receivers remain
	* under the original SCTP multi channel but branch off those
	* associations carrying high volume data traffic into their own
	* separate SCTP channels.
	*
	* @param association
	* The association to branch off
	*
	* @return The {@code SctpChannel}
	*
	* @throws java.nio.channels.ClosedChannelException
	* If this channel is closed
	*
	* @throws IOException
	* If some other I/O error occurs
	*/
	public abstract SctpChannel branch(Association association)
	throws IOException;
	}

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