/*
 * 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
/** * 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;