5744N/A * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. 5744N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5744N/A * This code is free software; you can redistribute it and/or modify it 5744N/A * under the terms of the GNU General Public License version 2 only, as 5744N/A * published by the Free Software Foundation. Oracle designates this 5744N/A * particular file as subject to the "Classpath" exception as provided 5744N/A * by Oracle in the LICENSE file that accompanied this code. 5744N/A * This code is distributed in the hope that it will be useful, but WITHOUT 5744N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 5744N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 5744N/A * version 2 for more details (a copy is included in the LICENSE file that 5744N/A * You should have received a copy of the GNU General Public License version 5744N/A * 2 along with this work; if not, write to the Free Software Foundation, 5744N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 5744N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 5744N/A * or visit www.oracle.com if you need additional information or have any 5652N/A * Define a lightweight network protocol for discovering running and 5652N/A * manageable Java processes within a network subnet. 5652N/A * The protocol is lightweight multicast based, and works like a beacon, 5652N/A * broadcasting the JMXService URL needed to connect to the external JMX 5652N/A * agent if an application is started with appropriate parameters. 5652N/A * The payload is structured like this: 5652N/A * 4 bytes JDP magic (0xC0FFEE42) 5652N/A * 2 bytes JDP protocol version (1) 5652N/A * 2 bytes size of the next entry 5652N/A * x bytes next entry (UTF-8 encoded) 5652N/A * 2 bytes size of next entry 5652N/A * The payload will be parsed as even entries being keys, odd entries being 5652N/A * The standard JDP packet contains four entries: 5652N/A * - `DISCOVERABLE_SESSION_UUID` -- Unique id of the instance; this id changes every time 5652N/A * the discovery protocol starts and stops 5652N/A * - `JMX_SERVICE_URL` -- The URL to connect to the JMX agent 5652N/A * - `INSTANCE_NAME` -- The user-provided name of the running instance 6111N/A * The protocol sends packets to 224.0.23.178:7095 by default. 5652N/A * The protocol uses system properties to control it's behaviour: 5652N/A * - `com.sun.management.jdp.port` -- override default port 5652N/A * - `com.sun.management.jdp.address` -- override default address 5652N/A * - `com.sun.management.jmxremote.autodiscovery` -- whether we should start autodiscovery or 5652N/A * not. Autodiscovery starts if and only if following conditions are met: (autodiscovery is 5652N/A * true OR (autodiscovery is not set AND jdp.port is set)) 5652N/A * - `com.sun.management.jdp.ttl` -- set ttl for broadcast packet, default is 1 5652N/A * - `com.sun.management.jdp.pause` -- set broadcast interval in seconds default is 5 5652N/A * - `com.sun.management.jdp.source_addr` -- an address of interface to use for broadcast