Additional Enhancements

In addition to the features described above, Message Queue 4.2 included the following enhancements:

• Remotely Produced Message Metrics

  Message Queue 4.2 introduced new destination metrics that can be useful in monitoring destinations in a broker cluster. In a broker cluster, the messages stored in a given destination on a given broker in the cluster, consist of messages produced directly to the destination as well as messages sent to the destination from remote brokers in the cluster. In analyzing message routing and delivery in a broker cluster, it is sometimes helpful to know how many messages in a destination are local (locally produced) and how many are remote (remotely produced).

  Two new physical destination metric quantities are included in Message Queue 4.2:

  • Num messages remote, the current number of messages stored in memory and persistent store that were produced to a remote broker in a cluster, except for messages included in transactions.

  • Total Message bytes remote, the current total size in bytes of messages stored in memory and persistent store that were produced to a remote broker in a cluster, except for messages included in transactions.

  These new metric quantities are available through the imqcmd list dst and imqcmd query dst commands (see Viewing Physical Destination Information in Sun GlassFish Message Queue 4.4 Administration Guide) and through new JMX attributes (see Destination Monitor in Sun GlassFish Message Queue 4.4 Developer’s Guide for JMX Clients).

• Wildcard Producer and Wildcard Consumer Information

  Information to support the use of wildcard characters in destination names (see Multiple Destinations for a Publisher or Subscriber) is provided through new monitoring data. For example, the number of wildcard producers or consumers associated with a destination are available through the imqcmd query dst command (see Viewing Physical Destination Information in Sun GlassFish Message Queue 4.4 Administration Guide) and through new JMX attributes (see Destination Monitor in Sun GlassFish Message Queue 4.4 Developer’s Guide for JMX Clients). Also, wildcard information is available through the ConsumerManager Monitor and ProducerManager Monitor MBeans.

• Support for DN Username Format for Client Authentication

  Message Queue 4.2 introduced support for DN username format in client connection authentication against an LDAP user repository. The support involves the following new broker property (and value):

  imq.user_repository.ldap.usrformat=dn

  This property lets the broker authenticate a client user against an entry in an LDAP user repository by extracting from the DN username format the value of the attribute specified by the following property:

  imq.user_repository.ldap.uidattr

  The broker uses the value of the above attribute as the name of the user in access control operations.

  For example, if imq.user_repository.ldap.uidattr=udi and a client authentication username is in the format udi=mquser,ou=People,dc=red,dc=sun,dc=com, then “mquser” would be extracted for performing access control.

• JAAS Authentication Enhancement

  Message Queue 4.2 introduced JAAS authentication by IP address as well as by username.