javax.management.remote

## 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:

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

    - ### Fields inherited from class javax.management.Notification

      `source`

  - ### Constructor Summary

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

  - ### Method Summary

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

    - ### Methods inherited from class javax.management.Notification

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

    - ### Methods inherited from class java.util.EventObject

      `getSource`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### 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 Detail

    - #### 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 Detail

    - #### getConnectionId

          public String getConnectionId()

      The connection ID to which this notification pertains.

      Returns:
        the connection ID.

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