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package javax.management;



Can be implemented by an MBean in order to
carry out operations before and after being registered or unregistered from
the MBean Server.  An MBean can also implement this interface in order
to get a reference to the MBean Server and/or its name within that
MBean Server.


Since:1.5
/**
 * <p>Can be implemented by an MBean in order to
 * carry out operations before and after being registered or unregistered from
 * the MBean Server.  An MBean can also implement this interface in order
 * to get a reference to the MBean Server and/or its name within that
 * MBean Server.</p>
 *
 * @since 1.5
 */
public interface MBeanRegistration   {


    
Allows the MBean to perform any operations it needs before
being registered in the MBean Server.  If the name of the MBean
is not specified, the MBean can provide a name for its
registration.  If any exception is raised, the MBean will not be
registered in the MBean Server.

Params:
  • server – The MBean Server in which the MBean will be registered.
  • name – The object name of the MBean.  This name is null if
the name parameter to one of the createMBean or
registerMBean methods in the MBeanServer interface is null. In that case, this method must return a non-null ObjectName for the new MBean.
Throws:
Returns:The name under which the MBean is to be registered.
This value must not be null.  If the name
parameter is not null, it will usually but not necessarily be
the returned value.
/**
     * Allows the MBean to perform any operations it needs before
     * being registered in the MBean Server.  If the name of the MBean
     * is not specified, the MBean can provide a name for its
     * registration.  If any exception is raised, the MBean will not be
     * registered in the MBean Server.
     *
     * @param server The MBean Server in which the MBean will be registered.
     *
     * @param name The object name of the MBean.  This name is null if
     * the name parameter to one of the <code>createMBean</code> or
     * <code>registerMBean</code> methods in the {@link MBeanServer}
     * interface is null.  In that case, this method must return a
     * non-null ObjectName for the new MBean.
     *
     * @return The name under which the MBean is to be registered.
     * This value must not be null.  If the <code>name</code>
     * parameter is not null, it will usually but not necessarily be
     * the returned value.
     *
     * @exception java.lang.Exception This exception will be caught by
     * the MBean Server and re-thrown as an {@link
     * MBeanRegistrationException}.
     */
    public ObjectName preRegister(MBeanServer server,
                                  ObjectName name) throws java.lang.Exception;

    
Allows the MBean to perform any operations needed after having been
registered in the MBean server or after the registration has failed.

If the implementation of this method throws a RuntimeException or an Error, the MBean Server will rethrow those inside a RuntimeMBeanException or RuntimeErrorException, respectively. However, throwing an exception in postRegister will not change the state of the MBean: if the MBean was already registered (registrationDone is true), the MBean will remain registered. 


This might be confusing for the code calling createMBean() or registerMBean(), as such code might assume that MBean registration has failed when such an exception is raised. Therefore it is recommended that implementations of postRegister do not throw Runtime Exceptions or Errors if it can be avoided.


Params:
  • registrationDone – Indicates whether or not the MBean has
been successfully registered in the MBean server. The value
false means that the registration phase has failed.
/**
     * Allows the MBean to perform any operations needed after having been
     * registered in the MBean server or after the registration has failed.
     * <p>If the implementation of this method throws a {@link RuntimeException}
     * or an {@link Error}, the MBean Server will rethrow those inside
     * a {@link RuntimeMBeanException} or {@link RuntimeErrorException},
     * respectively. However, throwing an exception in {@code postRegister}
     * will not change the state of the MBean:
     * if the MBean was already registered ({@code registrationDone} is
     * {@code true}), the MBean will remain registered. </p>
     * <p>This might be confusing for the code calling {@code createMBean()}
     * or {@code registerMBean()}, as such code might assume that MBean
     * registration has failed when such an exception is raised.
     * Therefore it is recommended that implementations of
     * {@code postRegister} do not throw Runtime Exceptions or Errors if it
     * can be avoided.</p>
     * @param registrationDone Indicates whether or not the MBean has
     * been successfully registered in the MBean server. The value
     * false means that the registration phase has failed.
     */
    public void postRegister(Boolean registrationDone);

    
Allows the MBean to perform any operations it needs before
being unregistered by the MBean server.

Throws:
/**
     * Allows the MBean to perform any operations it needs before
     * being unregistered by the MBean server.
     *
     * @exception java.lang.Exception This exception will be caught by
     * the MBean server and re-thrown as an {@link
     * MBeanRegistrationException}.
     */
    public void preDeregister() throws java.lang.Exception ;

    
Allows the MBean to perform any operations needed after having been
unregistered in the MBean server.

If the implementation of this method throws a RuntimeException or an Error, the MBean Server will rethrow those inside a RuntimeMBeanException or RuntimeErrorException, respectively. However, throwing an exception in postDeregister will not change the state of the MBean: the MBean was already successfully deregistered and will remain so. 


This might be confusing for the code calling unregisterMBean(), as it might assume that MBean deregistration has failed. Therefore it is recommended that implementations of postDeregister do not throw Runtime Exceptions or Errors if it can be avoided.


/**
     * Allows the MBean to perform any operations needed after having been
     * unregistered in the MBean server.
     * <p>If the implementation of this method throws a {@link RuntimeException}
     * or an {@link Error}, the MBean Server will rethrow those inside
     * a {@link RuntimeMBeanException} or {@link RuntimeErrorException},
     * respectively. However, throwing an exception in {@code postDeregister}
     * will not change the state of the MBean:
     * the MBean was already successfully deregistered and will remain so. </p>
     * <p>This might be confusing for the code calling
     * {@code unregisterMBean()}, as it might assume that MBean deregistration
     * has failed. Therefore it is recommended that implementations of
     * {@code postDeregister} do not throw Runtime Exceptions or Errors if it
     * can be avoided.</p>
     */
    public void postDeregister();

 }