This class implements the MBean for collection of statistics for the
messaging service. All statistics are since the last message service startup;
they are all reset when the message service is restarted.
author: Sun Microsystems, Inc.
Constructor to create the StatisticsBase and MessagingStatistics
instances.
Parameters: key - the string value to use as the key for this statisticsinstance.
Get the CompositeData instance that represents the current values for
the specific DeliveryChannel.
The delivery channel statistics in a CompositedData instance
Get the CompositeData instance that represents the current values for
the MessagingStatistics instance.
The messaging statistics in a CompositedData instance