745 lines
31 KiB
Java
745 lines
31 KiB
Java
/*
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* Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.nio.sctp;
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import java.net.SocketAddress;
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import java.net.InetAddress;
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import java.io.IOException;
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import java.util.Set;
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import java.nio.ByteBuffer;
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import java.nio.channels.spi.AbstractSelectableChannel;
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import java.nio.channels.spi.SelectorProvider;
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import java.nio.channels.ClosedChannelException;
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import java.nio.channels.NotYetBoundException;
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import java.nio.channels.SelectionKey;
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/**
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* A selectable channel for message-oriented SCTP sockets.
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*
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* <P> An SCTP multi channel supports many associations on a single socket.
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* An {@code SctpMultiChannel} is created by invoking the
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* {@link #open open} method of this class. A newly-created channel is open but
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* not yet bound. An attempt to invoke the {@link #receive receive} method of an
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* unbound channel will cause the {@link NotYetBoundException}
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* to be thrown. An attempt to invoke the {@link #send send} method of an
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* unbound channel will cause it to first invoke the {@link #bind bind} method.
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* The address(es) that the channel's socket is bound to can be retrieved by
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* calling {@link #getAllLocalAddresses getAllLocalAddresses}.
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*
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* <P> Messages may be sent and received without explicitly setting up an
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* association with the remote peer. The channel will implicitly setup
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* a new association whenever it sends or receives a message from a remote
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* peer if there is not already an association with that peer. Upon successful
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* association setup, an {@link AssociationChangeNotification
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* association changed} notification will be put to the SCTP stack with its
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* {@code event} parameter set to {@link
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* AssociationChangeNotification.AssocChangeEvent#COMM_UP
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* COMM_UP}. This notification can be received by invoking {@link #receive
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* receive}.
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*
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* <P> Socket options are configured using the
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* {@link #setOption(SctpSocketOption,Object,Association) setOption} method. An
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* {@code SctpMultiChannel} supports the following options:
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* <blockquote>
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* <table border summary="Socket options">
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* <tr>
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* <th>Option Name</th>
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* <th>Description</th>
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* </tr>
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* <tr>
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* <td> {@link SctpStandardSocketOptions#SCTP_DISABLE_FRAGMENTS
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* SCTP_DISABLE_FRAGMENTS} </td>
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* <td> Enables or disables message fragmentation </td>
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* </tr>
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* <tr>
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* <td> {@link SctpStandardSocketOptions#SCTP_EXPLICIT_COMPLETE
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* SCTP_EXPLICIT_COMPLETE} </td>
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* <td> Enables or disables explicit message completion </td>
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* </tr>
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* <tr>
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* <td> {@link SctpStandardSocketOptions#SCTP_FRAGMENT_INTERLEAVE
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* SCTP_FRAGMENT_INTERLEAVE} </td>
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* <td> Controls how the presentation of messages occur for the message
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* receiver </td>
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* </tr>
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* <tr>
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* <td> {@link SctpStandardSocketOptions#SCTP_INIT_MAXSTREAMS
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* SCTP_INIT_MAXSTREAMS} </td>
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* <td> The maximum number of streams requested by the local endpoint during
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* association initialization </td>
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* </tr>
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* <tr>
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* <td> {@link SctpStandardSocketOptions#SCTP_NODELAY SCTP_NODELAY} </td>
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* <td> Enables or disable a Nagle-like algorithm </td>
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* </tr>
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* <tr>
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* <td> {@link SctpStandardSocketOptions#SCTP_PRIMARY_ADDR
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* SCTP_PRIMARY_ADDR} </td>
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* <td> Requests that the local SCTP stack use the given peer address as the
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* association primary </td>
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* </tr>
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* <tr>
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* <td> {@link SctpStandardSocketOptions#SCTP_SET_PEER_PRIMARY_ADDR
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* SCTP_SET_PEER_PRIMARY_ADDR} </td>
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* <td> Requests that the peer mark the enclosed address as the association
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* primary </td>
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* </tr>
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* <tr>
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* <td> {@link SctpStandardSocketOptions#SO_SNDBUF
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* SO_SNDBUF} </td>
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* <td> The size of the socket send buffer </td>
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* </tr>
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* <tr>
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* <td> {@link SctpStandardSocketOptions#SO_RCVBUF
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* SO_RCVBUF} </td>
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* <td> The size of the socket receive buffer </td>
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* </tr>
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* <tr>
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* <td> {@link SctpStandardSocketOptions#SO_LINGER
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* SO_LINGER} </td>
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* <td> Linger on close if data is present (when configured in blocking mode
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* only) </td>
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* </tr>
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* </table>
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* </blockquote>
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* Additional (implementation specific) options may also be supported. The list
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* of options supported is obtained by invoking the {@link #supportedOptions()
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* supportedOptions} method.
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*
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* <p> SCTP multi channels are safe for use by multiple concurrent threads.
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* They support concurrent sending and receiving, though at most one thread may be
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* sending and at most one thread may be receiving at any given time.
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*
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* @since 1.7
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*/
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@jdk.Exported
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public abstract class SctpMultiChannel
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extends AbstractSelectableChannel
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{
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/**
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* Initializes a new instance of this class.
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*
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* @param provider
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* The selector provider for this channel
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*/
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protected SctpMultiChannel(SelectorProvider provider) {
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super(provider);
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}
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/**
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* Opens an SCTP multi channel.
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*
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* <P> The new channel is unbound.
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*
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* @return A new SCTP multi channel
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*
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* @throws UnsupportedOperationException
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* If the SCTP protocol is not supported
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*
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* @throws IOException
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* If an I/O error occurs
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*/
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public static SctpMultiChannel open() throws
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IOException {
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return new sun.nio.ch.sctp.SctpMultiChannelImpl((SelectorProvider)null);
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}
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/**
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* Returns the open associations on this channel's socket.
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*
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* <P> Only associations whose {@link AssociationChangeNotification.AssocChangeEvent#COMM_UP
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* COMM_UP} association change event has been received are included
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* in the returned set of associations. Associations for which a
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* {@link AssociationChangeNotification.AssocChangeEvent#COMM_LOST COMM_LOST} or {@link
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* AssociationChangeNotification.AssocChangeEvent#SHUTDOWN SHUTDOWN} association change
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* event have been receive are removed from the set of associations.
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*
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* <P> The returned set of associations is a snapshot of the open
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* associations at the time that this method is invoked.
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*
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* @return A {@code Set} containing the open associations, or an empty
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* {@code Set} if there are none.
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*
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* @throws ClosedChannelException
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* If this channel is closed
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*
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* @throws IOException
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* If some other I/O error occurs
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*/
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public abstract Set<Association> associations()
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throws IOException;
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/**
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* Binds the channel's socket to a local address and configures the socket
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* to listen for connections.
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*
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* <P> This method is used to establish a relationship between the socket
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* and the local address. Once a relationship is established then
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* the socket remains bound until the channel is closed. This relationship
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* may not necesssarily be with the address {@code local} as it may be removed
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* by {@link #unbindAddress unbindAddress}, but there will always be at least one local
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* address bound to the channel's socket once an invocation of this method
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* successfully completes.
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*
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* <P> Once the channel's socket has been successfully bound to a specific
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* address, that is not automatically assigned, more addresses
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* may be bound to it using {@link #bindAddress bindAddress}, or removed
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* using {@link #unbindAddress unbindAddress}.
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*
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* <P> The backlog parameter is the maximum number of pending connections on
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* the socket. Its exact semantics are implementation specific. An implementation
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* may impose an implementation specific maximum length or may choose to ignore
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* the parameter. If the backlog parameter has the value {@code 0}, or a negative
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* value, then an implementation specific default is used.
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*
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* @param local
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* The local address to bind the socket, or {@code null} to
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* bind the socket to an automatically assigned socket address
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*
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* @param backlog
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* The maximum number number of pending connections
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*
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* @return This channel
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*
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* @throws ClosedChannelException
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* If this channel is closed
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*
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* @throws java.nio.channels.AlreadyBoundException
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* If this channel is already bound
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*
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* @throws java.nio.channels.UnsupportedAddressTypeException
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* If the type of the given address is not supported
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*
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* @throws SecurityException
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* If a security manager has been installed and its {@link
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* java.lang.SecurityManager#checkListen(int) checkListen} method
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* denies the operation
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*
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* @throws IOException
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* If some other I/O error occurs
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*/
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public abstract SctpMultiChannel bind(SocketAddress local,
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int backlog)
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throws IOException;
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/**
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* Binds the channel's socket to a local address and configures the socket
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* to listen for connections.
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*
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* <P> This method works as if invoking it were equivalent to evaluating the
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* expression:
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* <blockquote><pre>
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* bind(local, 0);
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* </pre></blockquote>
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*
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* @param local
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* The local address to bind the socket, or {@code null} to
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* bind the socket to an automatically assigned socket address
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*
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* @return This channel
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*
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* @throws ClosedChannelException
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* If this channel is closed
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*
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* @throws java.nio.channels.AlreadyBoundException
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* If this channel is already bound
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*
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* @throws java.nio.channels.UnsupportedAddressTypeException
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* If the type of the given address is not supported
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*
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* @throws SecurityException
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* If a security manager has been installed and its {@link
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* java.lang.SecurityManager#checkListen(int) checkListen} method
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* denies the operation
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*
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* @throws IOException
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* If some other I/O error occurs
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*/
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public final SctpMultiChannel bind(SocketAddress local)
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throws IOException {
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return bind(local, 0);
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}
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/**
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* Adds the given address to the bound addresses for the channel's
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* socket.
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*
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* <P> The given address must not be the {@link
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* java.net.InetAddress#isAnyLocalAddress wildcard} address.
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* The channel must be first bound using {@link #bind bind} before
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* invoking this method, otherwise {@link NotYetBoundException} is thrown.
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* The {@link #bind bind} method takes a {@code SocketAddress} as its
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* argument which typically contains a port number as well as an address.
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* Addresses subquently bound using this method are simply addresses as the
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* SCTP port number remains the same for the lifetime of the channel.
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*
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* <P> New associations setup after this method successfully completes
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* will be associated with the given address. Adding addresses to existing
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* associations is optional functionality. If the endpoint supports
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* dynamic address reconfiguration then it may send the appropriate message
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* to the peer to change the peers address lists.
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*
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* @param address
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* The address to add to the bound addresses for the socket
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*
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* @return This channel
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*
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* @throws ClosedChannelException
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* If this channel is closed
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*
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* @throws NotYetBoundException
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* If this channel is not yet bound
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*
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* @throws java.nio.channels.AlreadyBoundException
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* If this channel is already bound to the given address
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*
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* @throws IllegalArgumentException
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* If address is {@code null} or the {@link
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* java.net.InetAddress#isAnyLocalAddress wildcard} address
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*
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* @throws IOException
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* If some other I/O error occurs
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*/
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public abstract SctpMultiChannel bindAddress(InetAddress address)
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throws IOException;
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/**
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* Removes the given address from the bound addresses for the channel's
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* socket.
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*
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* <P> The given address must not be the {@link
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* java.net.InetAddress#isAnyLocalAddress wildcard} address.
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* The channel must be first bound using {@link #bind bind} before
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* invoking this method, otherwise {@link NotYetBoundException} is thrown.
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*
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* <P> If this method is invoked on a channel that does
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* not have {@code address} as one of its bound addresses, or that has only
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* one local address bound to it, then this method throws
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* {@link IllegalUnbindException}.
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*
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* <P> The initial address that the channel's socket is bound to using
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* {@link #bind bind} may be removed from the bound addresses for the
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* channel's socket.
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*
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* <P> New associations setup after this method successfully completes
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* will not be associated with the given address. Removing addresses from
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* existing associations is optional functionality. If the endpoint supports
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* dynamic address reconfiguration then it may send the appropriate message
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* to the peer to change the peers address lists.
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*
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* @param address
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* The address to remove from the bound addresses for the socket
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*
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* @return This channel
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*
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* @throws ClosedChannelException
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* If this channel is closed
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*
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* @throws NotYetBoundException
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* If this channel is not yet bound
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*
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* @throws IllegalUnbindException
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* {@code address} is not bound to the channel's socket, or the
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* channel has only one address bound to it
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*
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* @throws IllegalArgumentException
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* If address is {@code null} or the {@link
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* java.net.InetAddress#isAnyLocalAddress wildcard} address
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*
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* @throws IOException
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* If some other I/O error occurs
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*/
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public abstract SctpMultiChannel unbindAddress(InetAddress address)
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throws IOException;
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/**
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* Returns all of the socket addresses to which this channel's socket is
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* bound.
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*
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* @return All the socket addresses that this channel's socket is
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* bound to, or an empty {@code Set} if the channel's socket is not
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* bound
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*
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* @throws ClosedChannelException
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* If the channel is closed
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*
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* @throws IOException
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* If an I/O error occurs
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*/
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public abstract Set<SocketAddress> getAllLocalAddresses()
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throws IOException;
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/**
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* Returns all of the remote addresses to which the given association on
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* this channel's socket is connected.
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*
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* @param association
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* The association
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*
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* @return All of the remote addresses for the given association, or
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* an empty {@code Set} if the association has been shutdown
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*
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* @throws ClosedChannelException
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* If the channel is closed
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*
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* @throws IOException
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* If an I/O error occurs
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*/
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public abstract Set<SocketAddress> getRemoteAddresses(Association association)
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throws IOException;
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/**
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* Shutdown an association without closing the channel.
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*
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* @param association
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* The association to shutdown
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*
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* @return This channel
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*
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* @throws ClosedChannelException
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* If this channel is closed
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*
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* @throws IOException
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* If some other I/O error occurs
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*/
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public abstract SctpMultiChannel shutdown(Association association)
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throws IOException;
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/**
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* Returns the value of a socket option.
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*
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* <P> Note that some options are retrieved on the channel's socket,
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* therefore the {@code association} parameter is not applicable and will be
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* ignored if given. However, if the option is association specific then the
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* association must be given.
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*
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* @param <T>
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* The type of the socket option value
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*
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* @param name
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* The socket option
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*
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* @param association
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* The association whose option should be retrieved, or {@code null}
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* if this option should be retrieved at the channel's socket level.
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*
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* @return The value of the socket option. A value of {@code null} may be
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* a valid value for some socket options.
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*
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* @throws UnsupportedOperationException
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* If the socket option is not supported by this channel
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*
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* @throws ClosedChannelException
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* If this channel is closed
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*
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* @throws IOException
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* If an I/O error occurs
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*
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* @see SctpStandardSocketOptions
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*/
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public abstract <T> T getOption(SctpSocketOption<T> name,
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Association association)
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throws IOException;
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/**
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* Sets the value of a socket option.
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*
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* <P> Note that some options are retrieved on the channel's socket,
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* therefore the {@code association} parameter is not applicable and will be
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* ignored if given. However, if the option is association specific then the
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* association must be given.
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*
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* @param <T>
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* The type of the socket option value
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*
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* @param name
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* The socket option
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*
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* @param association
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* The association whose option should be set, or {@code null}
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* if this option should be set at the channel's socket level.
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*
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* @param value
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* The value of the socket option. A value of {@code null} may be
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* a valid value for some socket options.
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*
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* @return This channel
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*
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* @throws UnsupportedOperationException
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* If the socket option is not supported by this channel
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*
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* @throws IllegalArgumentException
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* If the value is not a valid value for this socket option
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*
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* @throws ClosedChannelException
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* If this channel is closed
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*
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* @throws IOException
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* If an I/O error occurs
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*
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* @see SctpStandardSocketOptions
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*/
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public abstract <T> SctpMultiChannel setOption(SctpSocketOption<T> name,
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T value,
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Association association)
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throws IOException;
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/**
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* Returns a set of the socket options supported by this channel.
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*
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* <P> This method will continue to return the set of options even after the
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* channel has been closed.
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*
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* @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;
|
|
}
|