| /* |
| * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package sun.management.jdp; |
| |
| /** |
| * JdpGenericPacket responsible to provide fields |
| * common for all Jdp packets |
| */ |
| public abstract class JdpGenericPacket implements JdpPacket { |
| |
| /** |
| * JDP protocol magic. Magic allows a reader to quickly select |
| * JDP packets from a bunch of broadcast packets addressed to the same port |
| * and broadcast group. Any packet intended to be parsed by JDP client |
| * has to start from this magic. |
| */ |
| private static final int MAGIC = 0xC0FFEE42; |
| |
| /** |
| * Current version of protocol. Any implementation of this protocol has to |
| * conform with the packet structure and the flow described in JEP-168 |
| */ |
| private static final short PROTOCOL_VERSION = 1; |
| |
| /** |
| * Default do-nothing constructor |
| */ |
| protected JdpGenericPacket(){ |
| // do nothing |
| } |
| |
| |
| /** |
| * Validate protocol header magic field |
| * |
| * @param magic - value to validate |
| * @throws JdpException |
| */ |
| public static void checkMagic(int magic) |
| throws JdpException { |
| if (magic != MAGIC) { |
| throw new JdpException("Invalid JDP magic header: " + magic); |
| } |
| } |
| |
| /** |
| * Validate protocol header version field |
| * |
| * @param version - value to validate |
| * @throws JdpException |
| */ |
| public static void checkVersion(short version) |
| throws JdpException { |
| |
| if (version > PROTOCOL_VERSION) { |
| throw new JdpException("Unsupported protocol version: " + version); |
| } |
| } |
| |
| /** |
| * |
| * @return protocol magic |
| */ |
| public static int getMagic() { |
| return MAGIC; |
| } |
| |
| /** |
| * |
| * @return current protocol version |
| */ |
| public static short getVersion() { |
| return PROTOCOL_VERSION; |
| } |
| } |