@Override
            public String getObjectIdentifier() {
                return identifier;
            }
Notifies all registered listeners that the given operation has succeeded
against the object having the given identifier within the Directory
represented by this resource.

@param operation
    The operation that was performed.

@param identifier
    The identifier of the object affected by the operation.

@param object
    The specific object affected by the operation, if available. If not
    available, this may be null.

@throws GuacamoleException
    If a listener throws a GuacamoleException from its event handler.
guacamole/src/main/java/org/apache/guacamole/rest/directory/DirectoryResource.java