| /* |
| * 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. |
| */ |
| /** |
| * Summary |
| * ------- |
| * |
| * Define a lightweight network protocol for discovering running and |
| * manageable Java processes within a network subnet. |
| * |
| * |
| * Description |
| * ----------- |
| * |
| * The protocol is lightweight multicast based, and works like a beacon, |
| * broadcasting the JMXService URL needed to connect to the external JMX |
| * agent if an application is started with appropriate parameters. |
| * |
| * The payload is structured like this: |
| * |
| * 4 bytes JDP magic (0xC0FFEE42) |
| * 2 bytes JDP protocol version (1) |
| * 2 bytes size of the next entry |
| * x bytes next entry (UTF-8 encoded) |
| * 2 bytes size of next entry |
| * ... Rinse and repeat... |
| * |
| * The payload will be parsed as even entries being keys, odd entries being |
| * values. |
| * |
| * The standard JDP packet contains four entries: |
| * |
| * - `DISCOVERABLE_SESSION_UUID` -- Unique id of the instance; this id changes every time |
| * the discovery protocol starts and stops |
| * |
| * - `MAIN_CLASS` -- The value of the `sun.java.command` property |
| * |
| * - `JMX_SERVICE_URL` -- The URL to connect to the JMX agent |
| * |
| * - `INSTANCE_NAME` -- The user-provided name of the running instance |
| * |
| * The protocol sends packets to 224.0.23.178:7095 by default. |
| * |
| * The protocol uses system properties to control it's behaviour: |
| * - `com.sun.management.jdp.port` -- override default port |
| * |
| * - `com.sun.management.jdp.address` -- override default address |
| * |
| * - `com.sun.management.jmxremote.autodiscovery` -- whether we should start autodiscovery or |
| * not. Autodiscovery starts if and only if following conditions are met: (autodiscovery is |
| * true OR (autodiscovery is not set AND jdp.port is set)) |
| * |
| * - `com.sun.management.jdp.ttl` -- set ttl for broadcast packet, default is 1 |
| * - `com.sun.management.jdp.pause` -- set broadcast interval in seconds default is 5 |
| * - `com.sun.management.jdp.source_addr` -- an address of interface to use for broadcast |
| */ |
| |
| package sun.management.jdp; |
