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package sun.management.jdp;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.UUID;

A packet to broadcasts JMX URL Fields:
  • UUID - broadcast session ID, changed every time when we start/stop discovery service
  • JMX_URL - URL to connect to JMX service
  • MAIN_CLASS - optional name of main class, filled from sun.java.command stripped for security reason to first space
  • INSTANCE_NAME - optional custom name of particular instance as provided by customer
/** * A packet to broadcasts JMX URL * * Fields: * * <ul> * <li>UUID - broadcast session ID, changed every time when we start/stop * discovery service</li> * <li>JMX_URL - URL to connect to JMX service</li> * <li>MAIN_CLASS - optional name of main class, filled from sun.java.command stripped for * security reason to first space</li> * <li>INSTANCE_NAME - optional custom name of particular instance as provided by customer</li> * </ul> */
public final class JdpJmxPacket extends JdpGenericPacket implements JdpPacket {
Session ID
/** * Session ID */
public final static String UUID_KEY = "DISCOVERABLE_SESSION_UUID";
Name of main class
/** * Name of main class */
public final static String MAIN_CLASS_KEY = "MAIN_CLASS";
JMX service URL
/** * JMX service URL */
public final static String JMX_SERVICE_URL_KEY = "JMX_SERVICE_URL";
Name of Java instance
/** * Name of Java instance */
public final static String INSTANCE_NAME_KEY = "INSTANCE_NAME"; private UUID id; private String mainClass; private String jmxServiceUrl; private String instanceName;
Create new instance from user provided data. Set mandatory fields
Params:
  • id – - java instance id
  • jmxServiceUrl – - JMX service url
/** * Create new instance from user provided data. Set mandatory fields * * @param id - java instance id * @param jmxServiceUrl - JMX service url */
public JdpJmxPacket(UUID id, String jmxServiceUrl) { this.id = id; this.jmxServiceUrl = jmxServiceUrl; }
Create new instance from network data Parse packet and set fields.
Params:
  • data – - raw packet data as it came from a Net
Throws:
/** * Create new instance from network data Parse packet and set fields. * * @param data - raw packet data as it came from a Net * @throws JdpException */
public JdpJmxPacket(byte[] data) throws JdpException { JdpPacketReader reader; reader = new JdpPacketReader(data); Map<String, String> p = reader.getDiscoveryDataAsMap(); String sId = p.get(UUID_KEY); this.id = (sId == null) ? null : UUID.fromString(sId); this.jmxServiceUrl = p.get(JMX_SERVICE_URL_KEY); this.mainClass = p.get(MAIN_CLASS_KEY); this.instanceName = p.get(INSTANCE_NAME_KEY); }
Set main class field
Params:
  • mainClass – - main class of running app
/** * Set main class field * * @param mainClass - main class of running app */
public void setMainClass(String mainClass) { this.mainClass = mainClass; }
Set instance name field
Params:
  • instanceName – - name of instance as provided by customer
/** * Set instance name field * * @param instanceName - name of instance as provided by customer */
public void setInstanceName(String instanceName) { this.instanceName = instanceName; }
Returns:id of discovery session
/** * @return id of discovery session */
public UUID getId() { return id; }
Returns:main class field
/** * * @return main class field */
public String getMainClass() { return mainClass; }
Returns:JMX service URL
/** * * @return JMX service URL */
public String getJmxServiceUrl() { return jmxServiceUrl; }
Returns:instance name
/** * * @return instance name */
public String getInstanceName() { return instanceName; }
Throws:
Returns:assembled packet ready to be sent across a Net
/** * * @return assembled packet ready to be sent across a Net * @throws IOException */
@Override public byte[] getPacketData() throws IOException { // Assemble packet from fields to byte array JdpPacketWriter writer; writer = new JdpPacketWriter(); writer.addEntry(UUID_KEY, (id == null) ? null : id.toString()); writer.addEntry(MAIN_CLASS_KEY, mainClass); writer.addEntry(JMX_SERVICE_URL_KEY, jmxServiceUrl); writer.addEntry(INSTANCE_NAME_KEY, instanceName); return writer.getPacketBytes(); }
Returns:packet hash code
/** * * @return packet hash code */
@Override public int hashCode() { int hash = 1; hash = hash * 31 + id.hashCode(); hash = hash * 31 + jmxServiceUrl.hashCode(); return hash; }
Compare two packets
Params:
  • o – - packet to compare
Returns:either packet equals or not
/** * Compare two packets * * @param o - packet to compare * @return either packet equals or not */
@Override public boolean equals(Object o) { if (o == null || ! (o instanceof JdpJmxPacket) ){ return false; } JdpJmxPacket p = (JdpJmxPacket) o; return Objects.equals(id, p.getId()) && Objects.equals(jmxServiceUrl, p.getJmxServiceUrl()); } }