/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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).
*
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*
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*/
/**
* 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;