https://openjdk.java.net/ 
/*
 * Copyright (c) 2009, 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 sun.nio.ch.SctpStdSocketOption;


SCTP channels supports the socket options defined by this class
(as well as those listed in the particular channel class) and may support
additional Implementation specific socket options.

Since:1.7
/**
 * SCTP channels supports the socket options defined by this class
 * (as well as those listed in the particular channel class) and may support
 * additional Implementation specific socket options.
 *
 * @since 1.7
 */
public class SctpStandardSocketOptions {
    private SctpStandardSocketOptions() {}
    
Enables or disables message fragmentation.

 The value of this socket option is a Boolean that represents whether the option is enabled or disabled. If enabled no SCTP message fragmentation will be performed. Instead if a message being sent exceeds the current PMTU size, the message will NOT be sent and an error will be indicated to the user. 
 It is implementation specific whether or not this option is
supported.

/**
     * Enables or disables message fragmentation.
     *
     * <P> The value of this socket option is a {@code Boolean} that represents
     * whether the option is enabled or disabled. If enabled no SCTP message
     * fragmentation will be performed. Instead if a message being sent
     * exceeds the current PMTU size, the message will NOT be sent and
     * an error will be indicated to the user.
     *
     * <P> It is implementation specific whether or not this option is
     * supported.
     */
    public static final SctpSocketOption<Boolean> SCTP_DISABLE_FRAGMENTS = new
        SctpStdSocketOption<Boolean>("SCTP_DISABLE_FRAGMENTS", Boolean.class,
        sun.nio.ch.SctpStdSocketOption.SCTP_DISABLE_FRAGMENTS);

    
Enables or disables explicit message completion.

 The value of this socket option is a Boolean that represents whether the option is enabled or disabled. When this option is enabled, the send method may be invoked multiple times to a send message. The isComplete parameter of the MessageInfo must only be set to true for the final send to indicate that the message is complete. If this option is disabled then each individual send invocation is considered complete. 
 The default value of the option is false indicating that the option is disabled. It is implementation specific whether or not this option is supported. 
/**
     * Enables or disables explicit message completion.
     *
     * <p> The value of this socket option is a {@code Boolean} that represents
     * whether the option is enabled or disabled. When this option is enabled,
     * the {@code send} method may be invoked multiple times to a send message.
     * The {@code isComplete} parameter of the {@link MessageInfo} must only
     * be set to {@code true} for the final send to indicate that the message is
     * complete. If this option is disabled then each individual {@code send}
     * invocation is considered complete.
     *
     * <P> The default value of the option is {@code false} indicating that the
     * option is disabled. It is implementation specific whether or not this
     * option is supported.
     */
    public static final SctpSocketOption<Boolean> SCTP_EXPLICIT_COMPLETE = new
        SctpStdSocketOption<Boolean>("SCTP_EXPLICIT_COMPLETE", Boolean.class,
        sun.nio.ch.SctpStdSocketOption.SCTP_EXPLICIT_COMPLETE);

    
Fragmented interleave controls how the presentation of messages occur for the message receiver. There are three levels of fragment interleave defined. Two of the levels effect SctpChannel, while SctpMultiChannel is effected by all three levels. 
 This option takes an Integer value. It can be set to a value of 0, 1 or 2. 
 Setting the three levels provides the following receiver
interactions:

 level 0 - Prevents the interleaving of any messages. This means that when a partial delivery begins, no other messages will be received except the message being partially delivered. If another message arrives on a different stream (or association) that could be delivered, it will be blocked waiting for the user to read all of the partially delivered message. 
 level 1 - Allows interleaving of messages that are from different associations. For SctpChannel, level 0 and level 1 have the same meaning since an SctpChannel always receives messages from the same association. Note that setting an 
SctpMultiChannel to this level may cause multiple partial delivers from different associations but for any given association, only one message will be delivered until all parts of a message have been delivered. This means that one large message, being read with an association identification of "X", will block other messages from association "X" from being delivered. 
 level 2 - Allows complete interleaving of messages. This level requires that the sender carefully observe not only the peer Association but also must pay careful attention to the stream number. With this option enabled a partially delivered message may begin being delivered for association "X" stream "Y" and the next subsequent receive may return a message from association "X" stream "Z". Note that no other messages would be delivered for association "X" stream "Y" until all of stream "Y"'s partially delivered message was read. Note that this option effects both channel types. Also note that for an SctpMultiChannel not only may another streams message from the same association be delivered from the next receive, some other associations message may be delivered upon the next receive. 
 It is implementation specific whether or not this option is
supported.

/**
     * Fragmented interleave controls how the presentation of messages occur
     * for the message receiver. There are three levels of fragment interleave
     * defined. Two of the levels effect {@link SctpChannel}, while
     * {@link SctpMultiChannel} is effected by all three levels.
     *
     * <P> This option takes an {@code Integer} value. It can be set to a value
     * of {@code 0}, {@code 1} or {@code 2}.
     *
     * <P> Setting the three levels provides the following receiver
     * interactions:
     *
     * <P> {@code level 0} - Prevents the interleaving of any messages. This
     * means that when a partial delivery begins, no other messages will be
     * received except the message being partially delivered. If another message
     * arrives on a different stream (or association) that could be delivered,
     * it will be blocked waiting for the user to read all of the partially
     * delivered message.
     *
     * <P> {@code level 1} - Allows interleaving of messages that are from
     * different associations. For {@code SctpChannel}, level 0 and
     * level 1 have the same meaning since an {@code SctpChannel} always
     * receives messages from the same association. Note that setting an {@code
     * SctpMultiChannel} to this level may cause multiple partial
     * delivers from different associations but for any given association, only
     * one message will be delivered until all parts of a message have been
     * delivered. This means that one large message, being read with an
     * association identification of "X", will block other messages from
     * association "X" from being delivered.
     *
     * <P> {@code level 2} - Allows complete interleaving of messages. This
     * level requires that the sender carefully observe not only the peer
     * {@code Association} but also must pay careful attention to the stream
     * number. With this option enabled a partially delivered message may begin
     * being delivered for association "X" stream "Y" and the next subsequent
     * receive may return a message from association "X" stream "Z". Note that
     * no other messages would be delivered for association "X" stream "Y"
     * until all of stream "Y"'s partially delivered message was read.
     * Note that this option effects both channel types.  Also note that
     * for an {@code SctpMultiChannel} not only may another streams
     * message from the same association be delivered from the next receive,
     * some other associations message may be delivered upon the next receive.
     *
     * <P> It is implementation specific whether or not this option is
     * supported.
     */
    public static final SctpSocketOption<Integer> SCTP_FRAGMENT_INTERLEAVE =
            new SctpStdSocketOption<Integer>("SCTP_FRAGMENT_INTERLEAVE",
                  Integer.class,
                  sun.nio.ch.SctpStdSocketOption.SCTP_FRAGMENT_INTERLEAVE);

    
The maximum number of streams requested by the local endpoint during
association initialization.

 The value of this socket option is an InitMaxStreams, that represents the maximum number of inbound and outbound streams that an association on the channel is prepared to support. 
 For an SctpChannel this option may only be used to change the number of inbound/outbound streams prior to connecting. 
 For an SctpMultiChannel this option determines the maximum number of inbound/outbound streams new associations setup on the channel will be prepared to support. 
 For an SctpServerChannel this option determines the maximum number of inbound/outbound streams accepted sockets will negotiate with their connecting peer. 
 In all cases the value set by this option is used in the negotiation of new associations setup on the channel's socket and the actual maximum number of inbound/outbound streams that have been negotiated with the peer can be retrieved from the appropriate Association. The Association can be retrieved from the COMM_UP AssociationChangeNotification belonging to that association. 
 This value is bounded by the actual implementation. In other
words the user may be able to support more streams than the Operating
System. In such a case, the Operating System limit may override the
value requested by the user. The default value of 0 indicates to use
the endpoints default value.

/**
     * The maximum number of streams requested by the local endpoint during
     * association initialization.
     *
     * <P> The value of this socket option is an {@link
     * SctpStandardSocketOptions.InitMaxStreams InitMaxStreams}, that represents
     * the maximum number of inbound and outbound streams that an association
     * on the channel is prepared to support.
     *
     * <P> For an {@link SctpChannel} this option may only be used to
     * change the number of inbound/outbound streams prior to connecting.
     *
     * <P> For an {@link SctpMultiChannel} this option determines
     * the maximum number of inbound/outbound streams new associations setup
     * on the channel will be prepared to support.
     *
     * <P> For an {@link SctpServerChannel} this option determines the
     * maximum number of inbound/outbound streams accepted sockets will
     * negotiate with their connecting peer.
     *
     * <P> In all cases the value set by this option is used in the negotiation
     * of new associations setup on the channel's socket and the actual
     * maximum number of inbound/outbound streams that have been negotiated
     * with the peer can be retrieved from the appropriate {@link
     * Association}. The {@code Association} can be retrieved from the
     * {@link AssociationChangeNotification.AssocChangeEvent#COMM_UP COMM_UP}
     * {@link AssociationChangeNotification} belonging to that association.
     *
     * <p> This value is bounded by the actual implementation. In other
     * words the user may be able to support more streams than the Operating
     * System. In such a case, the Operating System limit may override the
     * value requested by the user. The default value of 0 indicates to use
     * the endpoints default value.
     */
    public static final SctpSocketOption
        <SctpStandardSocketOptions.InitMaxStreams> SCTP_INIT_MAXSTREAMS =
        new SctpStdSocketOption<SctpStandardSocketOptions.InitMaxStreams>(
        "SCTP_INIT_MAXSTREAMS", SctpStandardSocketOptions.InitMaxStreams.class);

    
Enables or disables a Nagle-like algorithm.

 The value of this socket option is a Boolean that represents whether the option is enabled or disabled. SCTP uses an algorithm like The Nagle Algorithm to coalesce short segments and
improve network efficiency.

/**
     * Enables or disables a Nagle-like algorithm.
     *
     * <P> The value of this socket option is a {@code Boolean} that represents
     * whether the option is enabled or disabled. SCTP uses an algorithm like
     * <em>The Nagle Algorithm</em> to coalesce short segments and
     * improve network efficiency.
     */
    public static final SctpSocketOption<Boolean> SCTP_NODELAY =
        new SctpStdSocketOption<Boolean>("SCTP_NODELAY", Boolean.class,
        sun.nio.ch.SctpStdSocketOption.SCTP_NODELAY);

    
Requests that the local SCTP stack use the given peer address as
the association primary.

 The value of this socket option is a SocketAddress that represents the peer address that the local SCTP stack should use as the association primary. The address must be one of the association peer's addresses. 
 An SctpMultiChannel can control more than one association, the association parameter must be given when setting or retrieving this option. 
 Since SctpChannel only controls one association, the association parameter is not required and this option can be set or queried directly. 
/**
     * Requests that the local SCTP stack use the given peer address as
     * the association primary.
     *
     * <P> The value of this socket option is a {@code SocketAddress}
     * that represents the peer address that the local SCTP stack should use as
     * the association primary. The address must be one of the association
     * peer's addresses.
     *
     * <P> An {@code SctpMultiChannel} can control more than one
     * association, the association parameter must be given when setting or
     * retrieving this option.
     *
     * <P> Since {@code SctpChannel} only controls one association,
     * the association parameter is not required and this option can be
     * set or queried directly.
     */
     public static final SctpSocketOption<SocketAddress> SCTP_PRIMARY_ADDR =
             new SctpStdSocketOption<SocketAddress>
             ("SCTP_PRIMARY_ADDR", SocketAddress.class);

     
Requests that the peer mark the enclosed address as the association
primary.

 The value of this socket option is a SocketAddress that represents the local address that the peer should use as its primary address. The given address must be one of the association's locally bound addresses. 
 An SctpMultiChannel can control more than one association, the association parameter must be given when setting or retrieving this option. 
 Since SctpChannel only controls one association, the association parameter is not required and this option can be queried directly. 
 Note, this is a set only option and cannot be retrieved by 
getOption. It is implementation specific whether or not this option is supported. 
/**
     * Requests that the peer mark the enclosed address as the association
     * primary.
     *
     * <P> The value of this socket option is a {@code SocketAddress}
     * that represents the local address that the peer should use as its
     * primary address. The given address must be one of the association's
     * locally bound addresses.
     *
     * <P> An {@code SctpMultiChannel} can control more than one
     * association, the association parameter must be given when setting or
     * retrieving this option.
     *
     * <P> Since {@code SctpChannel} only controls one association,
     * the association parameter is not required and this option can be
     * queried directly.
     *
     * <P> Note, this is a set only option and cannot be retrieved by {@code
     * getOption}. It is implementation specific whether or not this
     * option is supported.
     */
    public static final SctpSocketOption<SocketAddress> SCTP_SET_PEER_PRIMARY_ADDR =
            new SctpStdSocketOption<SocketAddress>
            ("SCTP_SET_PEER_PRIMARY_ADDR", SocketAddress.class);

    
The size of the socket send buffer.

 The value of this socket option is an Integer that is the size of the socket send buffer in bytes. The socket send buffer is an output buffer used by the networking implementation. It may need to be increased for high-volume connections. The value of the socket option is a hint to the implementation to size the buffer and the actual
size may differ. The socket option can be queried to retrieve the actual
size.

 For SctpChannel, this controls the amount of data the SCTP stack may have waiting in internal buffers to be sent. This option therefore bounds the maximum size of data that can be sent in a single send call. 
 For SctpMultiChannel, the effect is the same as for 
SctpChannel, except that it applies to all associations. The option applies to each association's window size separately. 
 An implementation allows this socket option to be set before the
socket is bound or connected. Whether an implementation allows the
socket send buffer to be changed after the socket is bound is system
dependent.

/**
     * The size of the socket send buffer.
     *
     * <p> The value of this socket option is an {@code Integer} that is the
     * size of the socket send buffer in bytes. The socket send buffer is an
     * output buffer used by the networking implementation. It may need to be
     * increased for high-volume connections. The value of the socket option is
     * a <em>hint</em> to the implementation to size the buffer and the actual
     * size may differ. The socket option can be queried to retrieve the actual
     * size.
     *
     * <p> For {@code SctpChannel}, this controls the amount of data
     * the SCTP stack may have waiting in internal buffers to be sent. This
     * option therefore bounds the maximum size of data that can be sent in a
     * single send call.
     *
     * <P> For {@code SctpMultiChannel}, the effect is the same as for {@code
     * SctpChannel}, except that it applies to all associations. The option
     * applies to each association's window size separately.
     *
     * <p> An implementation allows this socket option to be set before the
     * socket is bound or connected. Whether an implementation allows the
     * socket send buffer to be changed after the socket is bound is system
     * dependent.
     */
    public static final SctpSocketOption<Integer> SO_SNDBUF =
        new SctpStdSocketOption<Integer>("SO_SNDBUF", Integer.class,
        sun.nio.ch.SctpStdSocketOption.SO_SNDBUF);

    
The size of the socket receive buffer.

 The value of this socket option is an Integer that is the size of the socket receive buffer in bytes. The socket receive buffer is an input buffer used by the networking implementation. It may need to be increased for high-volume connections or decreased to limit the possible backlog of incoming data. The value of the socket option is a hint to the implementation to size the buffer and the actual
size may differ.

 For SctpChannel, this controls the receiver window size. 
 For SctpMultiChannel, the meaning is implementation dependent. It might control the receive buffer for each association bound to the socket descriptor or it might control the receive buffer for the whole socket. 
 An implementation allows this socket option to be set before the
socket is bound or connected. Whether an implementation allows the
socket receive buffer to be changed after the socket is bound is system
dependent.

/**
     * The size of the socket receive buffer.
     *
     * <P> The value of this socket option is an {@code Integer} that is the
     * size of the socket receive buffer in bytes. The socket receive buffer is
     * an input buffer used by the networking implementation. It may need to be
     * increased for high-volume connections or decreased to limit the possible
     * backlog of incoming data. The value of the socket option is a
     * <em>hint</em> to the implementation to size the buffer and the actual
     * size may differ.
     *
     * <P> For {@code SctpChannel}, this controls the receiver window size.
     *
     * <P> For {@code SctpMultiChannel}, the meaning is implementation
     * dependent. It might control the receive buffer for each association bound
     * to the socket descriptor or it might control the receive buffer for the
     * whole socket.
     *
     * <p> An implementation allows this socket option to be set before the
     * socket is bound or connected. Whether an implementation allows the
     * socket receive buffer to be changed after the socket is bound is system
     * dependent.
     */
    public static final SctpSocketOption<Integer> SO_RCVBUF =
        new SctpStdSocketOption<Integer>("SO_RCVBUF", Integer.class,
        sun.nio.ch.SctpStdSocketOption.SO_RCVBUF);

    
Linger on close if data is present.

 The value of this socket option is an Integer that controls the action taken when unsent data is queued on the socket and a method to close the socket is invoked. If the value of the socket option is zero or greater, then it represents a timeout value, in seconds, known as the linger interval. The linger interval is the timeout for the close method to block while the operating system attempts to transmit the unsent data or it decides that it is unable to transmit the data. If the value of the socket option is less than zero then the option is disabled. In that case the close method does not wait until unsent data is transmitted; if possible the operating system will transmit any unsent data before the connection is closed. 
 This socket option is intended for use with sockets that are configured in blocking mode only. The behavior of the close method when this option is enabled on a non-blocking socket is not defined. 
 The initial value of this socket option is a negative value, meaning
that the option is disabled. The option may be enabled, or the linger
interval changed, at any time. The maximum value of the linger interval
is system dependent. Setting the linger interval to a value that is
greater than its maximum value causes the linger interval to be set to
its maximum value.

/**
     * Linger on close if data is present.
     *
     * <p> The value of this socket option is an {@code Integer} that controls
     * the action taken when unsent data is queued on the socket and a method
     * to close the socket is invoked. If the value of the socket option is zero
     * or greater, then it represents a timeout value, in seconds, known as the
     * <em>linger interval</em>. The linger interval is the timeout for the
     * {@code close} method to block while the operating system attempts to
     * transmit the unsent data or it decides that it is unable to transmit the
     * data. If the value of the socket option is less than zero then the option
     * is disabled. In that case the {@code close} method does not wait until
     * unsent data is transmitted; if possible the operating system will transmit
     * any unsent data before the connection is closed.
     *
     * <p> This socket option is intended for use with sockets that are configured
     * in {@link java.nio.channels.SelectableChannel#isBlocking() blocking} mode
     * only. The behavior of the {@code close} method when this option is
     * enabled on a non-blocking socket is not defined.
     *
     * <p> The initial value of this socket option is a negative value, meaning
     * that the option is disabled. The option may be enabled, or the linger
     * interval changed, at any time. The maximum value of the linger interval
     * is system dependent. Setting the linger interval to a value that is
     * greater than its maximum value causes the linger interval to be set to
     * its maximum value.
     */
    public static final SctpSocketOption<Integer> SO_LINGER =
        new SctpStdSocketOption<Integer>("SO_LINGER", Integer.class,
        sun.nio.ch.SctpStdSocketOption.SO_LINGER);

    
This class is used to set the maximum number of inbound/outbound streams used by the local endpoint during association initialization. An instance of this class is used to set the SCTP_INIT_MAXSTREAMS socket option. 
Since:1.7
/**
     * This class is used to set the maximum number of inbound/outbound streams
     * used by the local endpoint during association initialization. An
     * instance of this class is used to set the {@link
     * SctpStandardSocketOptions#SCTP_INIT_MAXSTREAMS SCTP_INIT_MAXSTREAMS}
     * socket option.
     *
     * @since 1.7
     */
    public static class InitMaxStreams {
        private int maxInStreams;
        private int maxOutStreams;

        private InitMaxStreams(int maxInStreams, int maxOutStreams) {
           this.maxInStreams = maxInStreams;
           this.maxOutStreams = maxOutStreams;
        }

        
Creates an InitMaxStreams instance.

Params:
  • maxInStreams –  The maximum number of inbound streams, where 0 <= maxInStreams <= 65536
  • maxOutStreams –  The maximum number of outbound streams, where 0 <= maxOutStreams <= 65536
Throws:
Returns: An InitMaxStreams instance
/**
         * Creates an InitMaxStreams instance.
         *
         * @param  maxInStreams
         *         The maximum number of inbound streams, where
         *         {@code 0 <= maxInStreams <= 65536}
         *
         * @param  maxOutStreams
         *         The maximum number of outbound streams, where
         *         {@code 0 <= maxOutStreams <= 65536}
         *
         * @return  An {@code InitMaxStreams} instance
         *
         * @throws  IllegalArgumentException
         *          If an argument is outside of specified bounds
         */
        public static InitMaxStreams create
              (int maxInStreams, int maxOutStreams) {
            if (maxOutStreams < 0 || maxOutStreams > 65535)
                throw new IllegalArgumentException(
                      "Invalid maxOutStreams value");
            if (maxInStreams < 0 || maxInStreams > 65535)
                throw new IllegalArgumentException(
                      "Invalid maxInStreams value");

            return new InitMaxStreams(maxInStreams, maxOutStreams);
        }

        
Returns the maximum number of inbound streams.

Returns: Maximum inbound streams
/**
         * Returns the maximum number of inbound streams.
         *
         * @return  Maximum inbound streams
         */
        public int maxInStreams() {
            return maxInStreams;
        }

        
Returns the maximum number of outbound streams.

Returns: Maximum outbound streams
/**
         * Returns the maximum number of outbound streams.
         *
         * @return  Maximum outbound streams
         */
        public int maxOutStreams() {
            return maxOutStreams;
        }

        
Returns a string representation of this init max streams, including
the maximum in and out bound streams.

Returns: A string representation of this init max streams
/**
         * Returns a string representation of this init max streams, including
         * the maximum in and out bound streams.
         *
         * @return  A string representation of this init max streams
         */
        @Override
        public String toString() {
            StringBuilder sb = new StringBuilder();
            sb.append(super.toString()).append(" [");
            sb.append("maxInStreams:").append(maxInStreams);
            sb.append("maxOutStreams:").append(maxOutStreams).append("]");
            return sb.toString();
        }

        
Returns true if the specified object is another InitMaxStreams instance with the same number of in and out bound streams. 
Params:
  • obj – 
        The object to be compared with this init max streams
Returns: true if the specified object is another InitMaxStreams instance with the same number of in and out bound streams
/**
         * Returns true if the specified object is another {@code InitMaxStreams}
         * instance with the same number of in and out bound streams.
         *
         * @param  obj
         *         The object to be compared with this init max streams
         *
         * @return  true if the specified object is another
         *          {@code InitMaxStreams} instance with the same number of in
         *          and out bound streams
         */
        @Override
        public boolean equals(Object obj) {
            if (obj != null && obj instanceof InitMaxStreams) {
                InitMaxStreams that = (InitMaxStreams) obj;
                if (this.maxInStreams == that.maxInStreams &&
                    this.maxOutStreams == that.maxOutStreams)
                    return true;
            }
            return false;
        }

        
Returns a hash code value for this init max streams.

/**
         * Returns a hash code value for this init max streams.
         */
        @Override
        public int hashCode() {
            int hash = 7 ^ maxInStreams ^ maxOutStreams;
            return hash;
        }
    }
}