Class JMXConnectionNotification

java.lang.Object

java.util.EventObject

javax.management.Notification

javax.management.remote.JMXConnectionNotification

All Implemented Interfaces:

Serializable

public class JMXConnectionNotification
extends Notification

Notification emitted when a client connection is opened or closed or when notifications are lost. These notifications are sent by connector servers (instances of JMXConnectorServer) and by connector clients (instances of JMXConnector). For certain connectors, a session can consist of a sequence of connections. Connection-opened and connection-closed notifications will be sent for each one.

The notification type is one of the following:

JMXConnectionNotification Types

Type	Meaning
jmx.remote.connection.opened	A new client connection has been opened.
jmx.remote.connection.closed	A client connection has been closed.
jmx.remote.connection.failed	A client connection has failed unexpectedly.
jmx.remote.connection.notifs.lost	A client connection has potentially lost notifications. This notification only appears on the client side.

The timeStamp of the notification is a time value (consistent with System.currentTimeMillis()) indicating when the notification was constructed.

Since:

1.5

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CLOSED	Notification type string for a connection-closed notification.
static final String	FAILED	Notification type string for a connection-failed notification.
static final String	NOTIFS_LOST	Notification type string for a connection that has possibly lost notifications.
static final String	OPENED	Notification type string for a connection-opened notification.

Fields declared in class Notification

source

Modifier and Type	Field	Description
protected Object	source	This field hides the EventObject.source field in the parent class to make it non-transient and therefore part of the serialized form.

Constructor Summary

Constructors

Constructor	Description
JMXConnectionNotification(String type, Object source, String connectionId, long sequenceNumber, String message, Object userData)	Constructs a new connection notification.

Method Summary

Modifier and Type	Method	Description
String	getConnectionId()	The connection ID to which this notification pertains.

Methods declared in class Notification

getMessage, getSequenceNumber, getTimeStamp, getType, getUserData, setSequenceNumber, setSource, setTimeStamp, setUserData, toString

Modifier and Type	Method	Description
String	getMessage()	Get the notification message.
long	getSequenceNumber()	Get the notification sequence number.
long	getTimeStamp()	Get the notification timestamp.
String	getType()	Get the notification type.
Object	getUserData()	Get the user data.
void	setSequenceNumber(long sequenceNumber)	Set the notification sequence number.
void	setSource(Object source)	Sets the source.
void	setTimeStamp(long timeStamp)	Set the notification timestamp.
void	setUserData(Object userData)	Set the user data.
String	toString()	Returns a String representation of this notification.

Methods declared in class EventObject

getSource

Modifier and Type	Method	Description
Object	getSource()	The object on which the Event initially occurred.

Methods declared in class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Modifier and Type	Method	Description
protected Object	clone()	Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
boolean	equals(Object o)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. May cause performance issues, deadlocks and hangs.
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode()	Answers an integer hash code for the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

Field Details

OPENED

public static final String OPENED

Notification type string for a connection-opened notification.

See Also:

• Constant Field Values

CLOSED

public static final String CLOSED

Notification type string for a connection-closed notification.

See Also:

• Constant Field Values

FAILED

public static final String FAILED

Notification type string for a connection-failed notification.

See Also:

• Constant Field Values

NOTIFS_LOST

public static final String NOTIFS_LOST

Notification type string for a connection that has possibly lost notifications.

See Also:

• Constant Field Values

Constructor Details

JMXConnectionNotification

public JMXConnectionNotification(String type,
 Object source,
 String connectionId,
 long sequenceNumber,
 String message,
 Object userData)

Constructs a new connection notification. The source of the notification depends on whether it is being sent by a connector server or a connector client:

• For a connector server, if it is registered in an MBean server, the source is the ObjectName under which it is registered. Otherwise, it is a reference to the connector server object itself, an instance of a subclass of JMXConnectorServer.
• For a connector client, the source is a reference to the connector client object, an instance of a class implementing JMXConnector.

Parameters:

type - the type of the notification. This is usually one of the constants OPENED, CLOSED, FAILED, NOTIFS_LOST. It is not an error for it to be a different string.

source - the connector server or client emitting the notification.

connectionId - the ID of the connection within its connector server.

sequenceNumber - a non-negative integer. It is expected but not required that this number will be greater than any previous sequenceNumber in a notification from this source.

message - an unspecified text message, typically containing a human-readable description of the event. Can be null.

userData - an object whose type and meaning is defined by the connector server. Can be null.

Throws:

NullPointerException - if type, source, or connectionId is null.

IllegalArgumentException - if sequenceNumber is negative.

Method Details

getConnectionId

public String getConnectionId()

The connection ID to which this notification pertains.

Returns:

the connection ID.