/* * 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. */ /** * A Java API for Stream Control Transport Protocol. * * <P> The Stream Control Transport Protocol (SCTP) is a reliable, * message-oriented, transport protocol existing at an equivalent level with UDP * (User Datagram Protocol) and TCP (Transmission Control Protocol). SCTP is * session oriented and an association between the endpoints must be established * before any data can be transmitted. * * <P> SCTP has direct support for multi-homing, meaning than an endpoint may be * represented by more than one address and each address may be used for sending * and receiving data, thus providing network redundancy. The connection between * two endpoints is referred to as an association between those endpoints. * Endpoints can exchange a list of addresses during association setup. One * address is designated as the primary address, this is the default address that * the peer will use for sending data. A single port number is used across the * entire address list at an endpoint for a specific session. * * <P> SCTP is message based. I/O operations operate upon messages and message * boundaries are preserved. Each association may support multiple independant * logical streams. Each stream represents a sequence of messages within a single * association and streams are independant of one another, meaning that stream * identifiers and sequence numbers are included in the data packet to allow * sequencing of messages on a per-stream basis. * * <P> This package provides two programming model styles. The one-to-one style * supported by {@link com.sun.nio.sctp.SctpChannel} and {@link * com.sun.nio.sctp.SctpServerChannel}, and the one-to-many * style supported by {@link com.sun.nio.sctp.SctpMultiChannel}. * The semantics of the one-to-one style interface are very similar to TCP. * An {@code SctpChannel} can only control one SCTP association. The * semantics of the one-to-many style interface are very similar to UDP. An * {@code SctpMutliChannel} can control multiple SCTP associations. * * <P> Applications can send and receive per-message ancillary information through * {@link com.sun.nio.sctp.MessageInfo}. For example, the stream number that * the message it is to be sent or received from. The SCTP stack is event driven * and applications can receive notifications of certain SCTP events by invoking * the {@code receive} method of the SCTP channel with an appropriate {@link * com.sun.nio.sctp.NotificationHandler notification handler}. * * <P> The SCTP protocol is defined by * <A HREF="http://tools.ietf.org/html/rfc4960">RFC4960</A>, and the optional * extension for <I>Dynamic Address Reconfiguration</I> is defined by * <A HREF="http://tools.ietf.org/html/rfc5061">RFC5061</A>. * * @since 1.7 */ package com.sun.nio.sctp;