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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

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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;