Message Consumers

This section describes the MBeans used for managing message consumers:

The consumer manager configuration MBean configures message consumers.
The consumer manager monitor MBean monitors message consumers.

The following subsections describe each of these MBeans in detail.

Note - Notice that there are no resource MBeans associated with individual message consumers; rather, all consumers are managed through the broker's global consumer manager configuration and consumer manager monitor MBeans.

Consumer Manager Configuration

Each broker has a single consumer manager configuration MBean, used for configuring all of the broker's message consumers.

Object Name

The consumer manager configuration MBean has the following object name:

com.sun.messaging.jms.server:type=ConsumerManager,subtype=Config

A string representing this object name is defined as a static constant CONSUMER_MANAGER_CONFIG_MBEAN_NAME in the utility class MQObjectName.

Attribute

The consumer manager configuration MBean has the attribute shown in Table 3-59. The name of this attribute is defined as a static constant in the utility class ConsumerAttributes.

Table 3-59 Consumer Manager Configuration Attribute

Name	Type	Settable?	Description
`NumConsumers`	`Integer`	No	Current total number of message consumers

Operations

The consumer manager configuration MBean supports the operations shown in Table 3-60. The names of these operations are defined as static constants in the utility class ConsumerOperations.

Table 3-60 Consumer Manager Configuration Operations

Name	Parameters	Result Type	Description
`getConsumerIDs`	None	`String[]`	Consumer identifiers of all current message consumers
`purge`¹	consumerID (`String`)	None	Purge all messages The desired subscriber is designated by its consumer identifier (consumerID). The subscriber itself is not destroyed.

¹ Durable topic subscribers only

Consumer Manager Monitor

Each broker has a single consumer manager monitor MBean, used for monitoring all of the broker's message consumers.

Object Name

The consumer manager monitor MBean has the following object name:

com.sun.messaging.jms.server:type=ConsumerManager,subtype=Monitor

A string representing this object name is defined as a static constant CONSUMER_MANAGER_MONITOR_MBEAN_NAME in the utility class MQObjectName.

Attribute

The consumer manager monitor MBean has the attribute shown in Table 3-61. The name of this attribute is defined as a static constant in the utility class ConsumerAttributes.

Table 3-61 Consumer Manager Monitor Attribute

Name	Type	Settable?	Description
`NumConsumers`	`Integer`	No	Current total number of message consumers
`NumWildcardConsumers`	`Integer`	No	Number of wildcard message consumers associated with the broker

Operations

The consumer manager monitor MBean supports the operations shown in Table 3-62. The names of these operations are defined as static constants in the utility class ConsumerOperations.

Table 3-62 Consumer Manager Monitor Operations

Name	Parameters	Result Type	Description
`getConsumerIDs`	None	`String[]`	Consumer identifiers of all current message consumers
`getConsumerInfoByID`	consumerID (`String`)	`CompositeData`	Descriptive information about message consumer The desired consumer is designated by its consumer identifier (consumerID). The value returned is a JMX `CompositeData` object describing the consumer; see Table 3-63 for lookup keys used with this object.
`getConsumerInfo`	None	`CompositeData[]`	Descriptive information about all current message consumers The value returned is an array of JMX `CompositeData` objects describing the consumers; see Table 3-63 for lookup keys used with these objects.
`getConsumerWildcards`	none	`String[]`	Wildcard strings used by current consumers associated with the broker
`getNumWildcardConsumers`	wildcard-String	`Integer`	Number of current consumers associated with the broker that are using the specified wildcard string

The getConsumerInfoByID and getConsumerInfo operations return objects implementing the JMX interface CompositeData, which maps lookup keys to associated data values. The keys shown in Table 3-63 are defined as static constants in the utility class ConsumerInfo for use with these objects.

Table 3-63 Lookup Keys for Message Consumer Information

Name	Value Type	Description
`ConsumerID`	`String`	Consumer identifier
`Selector`	`String`	Message selector
`ServiceName`	`String`	Name of associated connection service
`ConnectionID`	`String`	Connection identifier of associated connection
`Host`	`String`	Connection's host name
`User`	`String`	Connection's user name
`DestinationName`	`String`	Name of associated destination
`DestinationNames`	`String[]`	Destination names that match wildcards used by wildcard consumers For topic destinations only.
`Wildcard`	`Boolean`	Wildcard consumer? For topic destinations only.
`DestinationType`	`String`	Type of associated destination See Table 3-64 for possible values.
`AcknowledgeMode`	`Integer`	Acknowledgment mode of associated session See Table 3-65 for possible values.
`AcknowledgeModeLabel`	`String`	String representation of acknowledgment mode Useful for displaying the acknowledgment mode in human-readable form, such as in the Java Monitoring and Management Console (`jconsole`). See Table 3-65 for possible values.
`Durable`	`Boolean`	Durable topic subscriber?
`DurableName`¹	`String`	Subscription name
`ClientID`¹	`String`	Client identifier
`DurableActive`¹	`Boolean`	Subscriber active?
`FlowPaused`	`Boolean`	Message delivery paused?
`NumMsgs`	`Long`	Cumulative number of messages that have been dispatched to consumer (includes messages that have been delivered and those waiting to be delivered)
`NumMsgsPending`	`Long`	Current number of messages that have been dispatched to consumer and are being held in broker memory and persistent store (includes messages that have been delivered and those waiting to be delivered)
`NumMsgsPendingAcks`	`Long`	Current number of messages that have been delivered to consumer and are being held in broker memory and persistent store pending acknowledgment
`NextMessageID`	`Long`	JMS Message ID of the next message to be delivered to consumer
`LastAckTime`	`Long`	Time of last acknowledgment, in standard Java format (milliseconds since January 1, 1970, 00:00:00 UTC)

¹ Durable topic subscribers only

Table 3-64 shows the possible values returned for the lookup key DestinationType. These values are defined as static constants in the utility class DestinationType.

Table 3-64 Message Consumer Destination Types

Value	Utility Constant	Meaning
`q`	`DestinationType.QUEUE`	Queue (point-to-point) destination
`t`	`DestinationType.TOPIC`	Topic (publish/subscribe) destination

Table 3-65 shows the possible values returned for the lookup keys AcknowledgeMode and AcknowledgeModeLabel. Four of these values are defined as static constants in the standard JMS interface javax.jms.Session; the fifth (NO_ACKNOWLEDGE) is defined in the extended Message Queue version of the interface, com.sun.messaging.jms.Session.

Table 3-65 Acknowledgment Modes

Value	Utility Constant	String Representation	Meaning
`1`	`javax.jms.Session.AUTO_ACKNOWLEDGE`	`AUTO_ACKNOWLEDGE`	Auto-acknowledge mode
`2`	`javax.jms.Session.CLIENT_ACKNOWLEDGE`	`CLIENT_ACKNOWLEDGE`	Client-acknowledge mode
`3`	`javax.jms.Session.DUPS_OK_ACKNOWLEDGE`	`DUPS_OK_ACKNOWLEDGE`	Dups-OK-acknowledge mode
`32768`	`com.sun.messaging.jms.Session.NO_ACKNOWLEDGE`	`NO_ACKNOWLEDGE`	No-acknowledge mode
`0`	`javax.jms.Session.SESSION_TRANSACTED`	`SESSION_TRANSACTED`	Session is transacted (acknowledgment mode ignored)

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