# Class MBeanServerDelegate

java.lang.Object
javax.management.MBeanServerDelegate

All Implemented Interfaces:
  `MBeanServerDelegateMBean, NotificationBroadcaster, NotificationEmitter`

public class MBeanServerDelegate extends Object implements MBeanServerDelegateMBean, NotificationEmitter
Represents the MBean server from the management point of view. The MBeanServerDelegate MBean emits the MBeanServerNotifications when an MBean is registered/unregistered in the MBean server.

Since:
  1.5

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final ObjectName`
  `DELEGATE_NAME`
  Defines the default ObjectName of the MBeanServerDelegate.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `MBeanServerDelegate()`
  Create a MBeanServerDelegate object.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback)`
  Adds a listener to this MBean.
  `String`
  `getImplementationName()`
  Returns the JMX implementation name (the name of this product).
  `String`
  `getImplementationVendor()`
  Returns the JMX implementation vendor (the vendor of this product).
  `String`
  `getImplementationVersion()`
  Returns the JMX implementation version (the version of this product).
  `String`
  `getMBeanServerId()`
  Returns the MBean server agent identity.
  `MBeanNotificationInfo[]`
  `getNotificationInfo()`
  Returns an array indicating, for each notification this MBean may send, the name of the Java class of the notification and the notification type.
  `String`
  `getSpecificationName()`
  Returns the full name of the JMX specification implemented by this product.
  `String`
  `getSpecificationVendor()`
  Returns the vendor of the JMX specification implemented by this product.
  `String`
  `getSpecificationVersion()`
  Returns the version of the JMX specification implemented by this product.
  `void`
  `removeNotificationListener(NotificationListener listener)`
  Removes a listener from this MBean.
  `void`
  `removeNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback)`
  Removes a listener from this MBean.
  `void`
  `sendNotification(Notification notification)`
  Enables the MBean server to send a notification.

  ### Methods declared in class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`
  Modifier and Type
  Method
  Description
  `protected Object`
  `clone()`
  Creates and returns a copy of this object.
  `boolean`
  `equals(Object obj)`
  Indicates whether some other object is "equal to" this one.
  `protected void`
  `finalize()`
  Deprecated, for removal: This API element is subject to removal in a future version.
  Finalization is deprecated and subject to removal in a future release.
  `final Class<?>`
  `getClass()`
  Returns the runtime class of this `Object`.
  `int`
  `hashCode()`
  Returns a hash code value for this object.
  `final void`
  `notify()`
  Wakes up a single thread that is waiting on this object's monitor.
  `final void`
  `notifyAll()`
  Wakes up all threads that are waiting on this object's monitor.
  `String`
  `toString()`
  Returns a string representation of the object.
  `final void`
  `wait()`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
  `final void`
  `wait(long timeoutMillis)`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
  `final void`
  `wait(long timeoutMillis, int nanos)`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

- ## Field Details

  - ### DELEGATE_NAME

    public static final ObjectName DELEGATE_NAME
    Defines the default ObjectName of the MBeanServerDelegate.
    Since:
      1.6

- ## Constructor Details

  - ### MBeanServerDelegate

    public MBeanServerDelegate()
    Create a MBeanServerDelegate object.

- ## Method Details

  - ### getMBeanServerId

    public String getMBeanServerId()
    Returns the MBean server agent identity.
    Specified by:
      `getMBeanServerId` in interface `MBeanServerDelegateMBean`
    Returns:
      the identity.

  - ### getSpecificationName

    public String getSpecificationName()
    Returns the full name of the JMX specification implemented by this product.
    Specified by:
      `getSpecificationName` in interface `MBeanServerDelegateMBean`
    Returns:
      the specification name.

  - ### getSpecificationVersion

    public String getSpecificationVersion()
    Returns the version of the JMX specification implemented by this product.
    Specified by:
      `getSpecificationVersion` in interface `MBeanServerDelegateMBean`
    Returns:
      the specification version.

  - ### getSpecificationVendor

    public String getSpecificationVendor()
    Returns the vendor of the JMX specification implemented by this product.
    Specified by:
      `getSpecificationVendor` in interface `MBeanServerDelegateMBean`
    Returns:
      the specification vendor.

  - ### getImplementationName

    public String getImplementationName()
    Returns the JMX implementation name (the name of this product).
    Specified by:
      `getImplementationName` in interface `MBeanServerDelegateMBean`
    Returns:
      the implementation name.

  - ### getImplementationVersion

    public String getImplementationVersion()
    Returns the JMX implementation version (the version of this product).
    Specified by:
      `getImplementationVersion` in interface `MBeanServerDelegateMBean`
    Returns:
      the implementation version.

  - ### getImplementationVendor

    public String getImplementationVendor()
    Returns the JMX implementation vendor (the vendor of this product).
    Specified by:
      `getImplementationVendor` in interface `MBeanServerDelegateMBean`
    Returns:
      the implementation vendor.

  - ### getNotificationInfo

    public MBeanNotificationInfo[] getNotificationInfo()
    Description copied from interface: `NotificationBroadcaster`

    Returns an array indicating, for each notification this MBean may send, the name of the Java class of the notification and the notification type.

    It is not illegal for the MBean to send notifications not described in this array. However, some clients of the MBean server may depend on the array being complete for their correct functioning.

    Specified by:
      `getNotificationInfo` in interface `NotificationBroadcaster`
    Returns:
      the array of possible notifications.

  - ### addNotificationListener

    public void addNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback) throws IllegalArgumentException
    Description copied from interface: `NotificationBroadcaster`
    Adds a listener to this MBean.
    Specified by:
      `addNotificationListener` in interface `NotificationBroadcaster`
    Parameters:
      `listener` - The listener object which will handle the notifications emitted by the broadcaster.
      `filter` - The filter object. If filter is null, no filtering will be performed before handling notifications.
      `handback` - An opaque object to be sent back to the listener when a notification is emitted. This object cannot be used by the Notification broadcaster object. It should be resent unchanged with the notification to the listener.
    Throws:
      `IllegalArgumentException` - Listener parameter is null.
    See Also:
      - `NotificationBroadcaster.removeNotificationListener(NotificationListener)`

  - ### removeNotificationListener

    public void removeNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback) throws ListenerNotFoundException
    Description copied from interface: `NotificationEmitter`

    Removes a listener from this MBean. The MBean must have a listener that exactly matches the given `listener`, `filter`, and `handback` parameters. If there is more than one such listener, only one is removed.

    The `filter` and `handback` parameters may be null if and only if they are null in a listener to be removed.

    Specified by:
      `removeNotificationListener` in interface `NotificationEmitter`
    Parameters:
      `listener` - A listener that was previously added to this MBean.
      `filter` - The filter that was specified when the listener was added.
      `handback` - The handback that was specified when the listener was added.
    Throws:
      `ListenerNotFoundException` - The listener is not registered with the MBean, or it is not registered with the given filter and handback.

  - ### removeNotificationListener

    public void removeNotificationListener(NotificationListener listener) throws ListenerNotFoundException
    Description copied from interface: `NotificationBroadcaster`
    Removes a listener from this MBean. If the listener has been registered with different handback objects or notification filters, all entries corresponding to the listener will be removed.
    Specified by:
      `removeNotificationListener` in interface `NotificationBroadcaster`
    Parameters:
      `listener` - A listener that was previously added to this MBean.
    Throws:
      `ListenerNotFoundException` - The listener is not registered with the MBean.
    See Also:
      - `NotificationBroadcaster.addNotificationListener(NotificationListener, NotificationFilter, Object)`
      - `NotificationEmitter.removeNotificationListener(NotificationListener, NotificationFilter, Object)`

  - ### sendNotification

    public void sendNotification(Notification notification)
    Enables the MBean server to send a notification. If the passed notification has a sequence number lesser or equal to 0, then replace it with the delegate's own sequence number.
    Parameters:
      `notification` - The notification to send.