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Chapter 3. Red Hat JBoss A-MQ Messaging Terms


advisory
advisory message
A special type of message that contains administrative information about the message broker. They are sent by the broker to special advisory topics.
See also: advisory topic
advisory topic
A group of special topics that are created by a message broker that are used for monitoring the state of the broker. The broker sends messages about a variety of internal broker events. Clients subscribing to these topics receive advisory messages about these objects.
Apache ActiveMQ
An open source project that provides the messaging technology for Red Hat JBoss A-MQ.
cluster
  • A group of brokers among which clients can failover.
    See also: failover.
  • A collection of clustered services.
    See also: clustered service
connection
A bridge between a client and a broker connector or between two brokers in a network of brokers.
connector
An object that connects clients to a broker.
composite destination
A virtual destination that serves as a proxy for multiple destinations. Producers can send messages to the composite destination an it will be automatically sent to all of the physical destinations that make up the composite destination.
dead letter queue
A special destination used by the message broker to hold undeliverable messages.
dynamic discovery
A mechanism for clients to become aware of the existence of brokers through the use of a discovery agent.
See also: discovery agent
discovery agent
A mechanism that advertises the list of available message brokers to message clients and other message brokers.
See also: dynamic discovery
exclusive consumer
A mechanism that ensures that only one consumer connected to a queue can consume messages.
failover
  • A transport that automatically moves to a new connection in the event that its current connection fails.
  • A cluster architecture where clients are able to migrate from a failed broker to a running broker.
network of brokers
A group of brokers that are linked together to operate as a single logical unit.
network connector
A configuration entity used to link brokers together to form a network of brokers.
See also: network of brokers
network bridge
A runtime directional link between brokers that is used to forward messages. Network bridges are created by network connectors.
See also: network connector
retroactive consumer
A consumer that indicates to the topic that every attempt is to be made to send messages that the consumer may have missed.
store and forward
A paradigm in which brokers receive messages, store them locally, and forwards the message to a recipient when it is able to do so. The message is only deleted once it has been successfully delivered.
transport connector
An address at which a message broker accepts client connections.
virtual destination
A logical destination that represents one or more physical destinations.
virtual topic
A logical topic that allows consumers to use a physical queue to consume messages from the destination.
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