StandardEmitterMBean (Java Platform SE 8 )
Keywords: javax.management.StandardEmitterMBean class
Date: 2020-03-26

compact3
javax.management

## Class StandardEmitterMBean

- java.lang.Object
- - javax.management.StandardMBean
  - - javax.management.StandardEmitterMBean

- All Implemented Interfaces:
    DynamicMBean, MBeanRegistration, NotificationBroadcaster, NotificationEmitter

      public class StandardEmitterMBean
      extends StandardMBean
      implements NotificationEmitter

  An MBean whose management interface is determined by reflection on a Java interface, and that emits notifications.

  The following example shows how to use the public constructor `StandardEmitterMBean(implementation, mbeanInterface, emitter)` to create an MBean emitting notifications with any implementation class name Impl, with a management interface defined (as for current Standard MBeans) by any interface Intf, and with any implementation of the interface `NotificationEmitter`. The example uses the class `NotificationBroadcasterSupport` as an implementation of the interface `NotificationEmitter`.

           MBeanServer mbs;
           ...
           final String[] types = new String[] {"sun.disc.space","sun.disc.alarm"};
           final MBeanNotificationInfo info = new MBeanNotificationInfo(
                                                types,
                                                Notification.class.getName(),
                                                "Notification about disc info.");
           final NotificationEmitter emitter =
                          new NotificationBroadcasterSupport(info);

           final Intf impl = new Impl(...);
           final Object mbean = new StandardEmitterMBean(
                                           impl, Intf.class, emitter);
           mbs.registerMBean(mbean, objectName);

  Since:
    1.6
  See Also:
    `StandardMBean`

- - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `StandardEmitterMBean(Class<?> mbeanInterface, boolean isMXBean, NotificationEmitter emitter)` Make an MBean whose management interface is specified by `mbeanInterface`, and where notifications are handled by the given `NotificationEmitter`.
    `protected` | `StandardEmitterMBean(Class<?> mbeanInterface, NotificationEmitter emitter)` Make an MBean whose management interface is specified by `mbeanInterface`, and where notifications are handled by the given `NotificationEmitter`.
    `` | `StandardEmitterMBean(T implementation, Class<T> mbeanInterface, boolean isMXBean, NotificationEmitter emitter)` Make an MBean whose management interface is specified by `mbeanInterface`, with the given implementation and where notifications are handled by the given `NotificationEmitter`.
    `` | `StandardEmitterMBean(T implementation, Class<T> mbeanInterface, NotificationEmitter emitter)` Make an MBean whose management interface is specified by `mbeanInterface`, with the given implementation and where notifications are handled by the given `NotificationEmitter`.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback)` Adds a listener to this MBean.
    `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.
    `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 n)` Sends a notification.

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

      `cacheMBeanInfo, getAttribute, getAttributes, getCachedMBeanInfo, getClassName, getConstructors, getDescription, getDescription, getDescription, getDescription, getDescription, getDescription, getDescription, getImpact, getImplementation, getImplementationClass, getMBeanInfo, getMBeanInterface, getParameterName, getParameterName, invoke, postDeregister, postRegister, preDeregister, preRegister, setAttribute, setAttributes, setImplementation`

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

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

- - ### Constructor Detail

    - #### StandardEmitterMBean

          public StandardEmitterMBean(T implementation,
                                      Class<T> mbeanInterface,
                                      NotificationEmitter emitter)

      Make an MBean whose management interface is specified by `mbeanInterface`, with the given implementation and where notifications are handled by the given `NotificationEmitter`. The resultant MBean implements the `NotificationEmitter` interface by forwarding its methods to `emitter`. It is legal and useful for `implementation` and `emitter` to be the same object.

      If `emitter` is an instance of `NotificationBroadcasterSupport` then the MBean's `sendNotification` method will call `emitter.` `sendNotification`.

      The array returned by `getNotificationInfo()` on the new MBean is a copy of the array returned by `emitter.` `getNotificationInfo()` at the time of construction. If the array returned by `emitter.getNotificationInfo()` later changes, that will have no effect on this object's `getNotificationInfo()`.

      Parameters:
        `implementation` - the implementation of the MBean interface.
        `mbeanInterface` - a Standard MBean interface.
        `emitter` - the object that will handle notifications.
      Throws:
        `IllegalArgumentException` - if the `mbeanInterface` does not follow JMX design patterns for Management Interfaces, or if the given `implementation` does not implement the specified interface, or if `emitter` is null.

    - #### StandardEmitterMBean

          public StandardEmitterMBean(T implementation,
                                      Class<T> mbeanInterface,
                                      boolean isMXBean,
                                      NotificationEmitter emitter)

      Make an MBean whose management interface is specified by `mbeanInterface`, with the given implementation and where notifications are handled by the given `NotificationEmitter`. This constructor can be used to make either Standard MBeans or MXBeans. The resultant MBean implements the `NotificationEmitter` interface by forwarding its methods to `emitter`. It is legal and useful for `implementation` and `emitter` to be the same object.

      If `emitter` is an instance of `NotificationBroadcasterSupport` then the MBean's `sendNotification` method will call `emitter.` `sendNotification`.

      The array returned by `getNotificationInfo()` on the new MBean is a copy of the array returned by `emitter.` `getNotificationInfo()` at the time of construction. If the array returned by `emitter.getNotificationInfo()` later changes, that will have no effect on this object's `getNotificationInfo()`.

      Parameters:
        `implementation` - the implementation of the MBean interface.
        `mbeanInterface` - a Standard MBean interface.
        `isMXBean` - If true, the `mbeanInterface` parameter names an MXBean interface and the resultant MBean is an MXBean.
        `emitter` - the object that will handle notifications.
      Throws:
        `IllegalArgumentException` - if the `mbeanInterface` does not follow JMX design patterns for Management Interfaces, or if the given `implementation` does not implement the specified interface, or if `emitter` is null.

    - #### StandardEmitterMBean

          protected StandardEmitterMBean(Class<?> mbeanInterface,
                                         NotificationEmitter emitter)

      Make an MBean whose management interface is specified by `mbeanInterface`, and where notifications are handled by the given `NotificationEmitter`. The resultant MBean implements the `NotificationEmitter` interface by forwarding its methods to `emitter`.

      If `emitter` is an instance of `NotificationBroadcasterSupport` then the MBean's `sendNotification` method will call `emitter.` `sendNotification`.

      The array returned by `getNotificationInfo()` on the new MBean is a copy of the array returned by `emitter.` `getNotificationInfo()` at the time of construction. If the array returned by `emitter.getNotificationInfo()` later changes, that will have no effect on this object's `getNotificationInfo()`.

      This constructor must be called from a subclass that implements the given `mbeanInterface`.

      Parameters:
        `mbeanInterface` - a StandardMBean interface.
        `emitter` - the object that will handle notifications.
      Throws:
        `IllegalArgumentException` - if the `mbeanInterface` does not follow JMX design patterns for Management Interfaces, or if `this` does not implement the specified interface, or if `emitter` is null.

    - #### StandardEmitterMBean

          protected StandardEmitterMBean(Class<?> mbeanInterface,
                                         boolean isMXBean,
                                         NotificationEmitter emitter)

      Make an MBean whose management interface is specified by `mbeanInterface`, and where notifications are handled by the given `NotificationEmitter`. This constructor can be used to make either Standard MBeans or MXBeans. The resultant MBean implements the `NotificationEmitter` interface by forwarding its methods to `emitter`.

      If `emitter` is an instance of `NotificationBroadcasterSupport` then the MBean's `sendNotification` method will call `emitter.` `sendNotification`.

      The array returned by `getNotificationInfo()` on the new MBean is a copy of the array returned by `emitter.` `getNotificationInfo()` at the time of construction. If the array returned by `emitter.getNotificationInfo()` later changes, that will have no effect on this object's `getNotificationInfo()`.

      This constructor must be called from a subclass that implements the given `mbeanInterface`.

      Parameters:
        `mbeanInterface` - a StandardMBean interface.
        `isMXBean` - If true, the `mbeanInterface` parameter names an MXBean interface and the resultant MBean is an MXBean.
        `emitter` - the object that will handle notifications.
      Throws:
        `IllegalArgumentException` - if the `mbeanInterface` does not follow JMX design patterns for Management Interfaces, or if `this` does not implement the specified interface, or if `emitter` is null.

  - ### Method Detail

    - #### 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(javax.management.NotificationListener, javax.management.NotificationFilter, java.lang.Object)`, `NotificationEmitter.removeNotificationListener(javax.management.NotificationListener, javax.management.NotificationFilter, java.lang.Object)`

    - #### 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.

    - #### addNotificationListener

          public void addNotificationListener(NotificationListener listener,
                                              NotificationFilter filter,
                                              Object handback)

      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.
      See Also:
        `NotificationBroadcaster.removeNotificationListener(javax.management.NotificationListener)`

    - #### 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.

    - #### sendNotification

          public void sendNotification(Notification n)

      Sends a notification.

      If the `emitter` parameter to the constructor was an instance of `NotificationBroadcasterSupport` then this method will call `emitter.` `sendNotification`.

      Parameters:
        `n` - the notification to send.
      Throws:
        `ClassCastException` - if the `emitter` parameter to the constructor was not a `NotificationBroadcasterSupport`.

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