1 /* 2 * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /** 27 * A Java API for Stream Control Transport Protocol. 28 * 29 * <P> The Stream Control Transport Protocol (SCTP) is a reliable, 30 * message-oriented, transport protocol existing at an equivalent level with UDP 31 * (User Datagram Protocol) and TCP (Transmission Control Protocol). SCTP is 32 * session oriented and an association between the endpoints must be established 33 * before any data can be transmitted. 34 * 35 * <P> SCTP has direct support for multi-homing, meaning than an endpoint may be 36 * represented by more than one address and each address may be used for sending 37 * and receiving data, thus providing network redundancy. The connection between 38 * two endpoints is referred to as an association between those endpoints. 39 * Endpoints can exchange a list of addresses during association setup. One 40 * address is designated as the primary address, this is the default address that 41 * the peer will use for sending data. A single port number is used across the 42 * entire address list at an endpoint for a specific session. 43 * 44 * <P> SCTP is message based. I/O operations operate upon messages and message 45 * boundaries are preserved. Each association may support multiple independent 46 * logical streams. Each stream represents a sequence of messages within a single 47 * association and streams are independent of one another, meaning that stream 48 * identifiers and sequence numbers are included in the data packet to allow 49 * sequencing of messages on a per-stream basis. 50 * 51 * <P> This package provides two programming model styles. The one-to-one style 52 * supported by {@link com.sun.nio.sctp.SctpChannel} and {@link 53 * com.sun.nio.sctp.SctpServerChannel}, and the one-to-many 54 * style supported by {@link com.sun.nio.sctp.SctpMultiChannel}. 55 * The semantics of the one-to-one style interface are very similar to TCP. 56 * An {@code SctpChannel} can only control one SCTP association. The 57 * semantics of the one-to-many style interface are very similar to UDP. An 58 * {@code SctpMutliChannel} can control multiple SCTP associations. 59 * 60 * <P> Applications can send and receive per-message ancillary information through 61 * {@link com.sun.nio.sctp.MessageInfo}. For example, the stream number that 62 * the message it is to be sent or received from. The SCTP stack is event driven 63 * and applications can receive notifications of certain SCTP events by invoking 64 * the {@code receive} method of the SCTP channel with an appropriate {@link 65 * com.sun.nio.sctp.NotificationHandler notification handler}. 66 * 67 * <P> The SCTP protocol is defined by 68 * <A HREF="http://tools.ietf.org/html/rfc4960">RFC4960</A>, and the optional 69 * extension for <I>Dynamic Address Reconfiguration</I> is defined by 70 * <A HREF="http://tools.ietf.org/html/rfc5061">RFC5061</A>. 71 * 72 * @since 1.7 73 */ 74 75 package com.sun.nio.sctp; 76