Defines the possible Class of Service level of a given message.
The Class of Service has different semantics for direct and guaranteed messages.
For direct messaging, it determines the WRR weight for the message. For guaranteed messaging,
it indicates the discard eligibility of the message if the endpoint is congested
Returns the enum constant of this type with the specified name.
The string must match exactly an identifier used to declare an
enum constant in this type. (Extraneous whitespace characters are
name - the name of the enum constant to be returned.