IBM MQ Overview (IBM Message Queue)

1. IBM Message Queue (IBM MQ)
Juarez Barbosa Junior
Senior Software Architect
jbarbosa@ie.ibm.com

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MOM – Introduction
• MOM – Message-oriented middleware
− IBM MQ, IBM MessageSight (MQTT), Tuxedo, TIBCO, HiveMQ (MQTT),
RabbitMQ (MQTT/AMQP), ActiveMQ (AMQP), Microsoft MSMQ - Brokers
− Asynchronous communication – Message Sender does not need to wait
for response from Message Receiver (fire-and-forget / non-blocking)
− Loose coupling – message producer does not need to know the details of
message consumer, they do not need to be active at the same time
− Point-to-point (queue), Publish-subscribe (topic)

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MOM – Introduction
• MOM – Message-oriented middleware
− Transactions – atomicity, consistency, isolation, durability, scalability, security,
acknowledgment, routing, transformation, filtering, priority, data enrichment,
data aggregation (async request, delayed response), persistence (QoS)
− Message – Binary or Character data
− Queue – Managed object that implements the point-to-point messaging model
and can receive and store messages in a MOM
− Topic – Managed object that implements the publish-subscribe messaging
model and receive and store messages in a MOM

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MOM – Message Oriented Middleware

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MOM – Message Oriented Middleware
• Point-to-Point (Queue)
− One to one (1…1), many to one (*…1)
− One queue per receiver, one message received by one receiver

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MOM – Message Oriented Middleware
• Publish-Subscribe (Topic)
− One to Many (1…*), Many to Many (*…*)
− Topic, same message may be received by many receivers

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MOM – Message Oriented Middleware
• Point-to-Point (FIFO Queue)
− All messages have the same priority
− Messages are delivered in the order they enter the queue - FIFO

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MOM – Message Oriented Middleware
• Point-to-Point (Priority Messages / Queue)
− Queue buffers the messages and orders them according to their priority when
they enter the queue (priority applied at point T in time)
− Messages are delivered in the order they enter the queue - FIFO

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MOM x Email - Analogy
MOM Email
MOM Message SMTP Message
Queue (point to point) Mailbox
Consumer POP3 / IMAP Mail Client
Producer SMTP Client
Queue Manager Mail Transfer Agent
Routing Info To: Cc: Bcc: addresses
Topic (Publish subscribe) Mailing list
Message ACK Read Receipt
TTL Expires Header
Communication for Systems Communication for People (users)

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IBM MQ – Introduction
• IBM Message Queue
− MQM / MQSeries (1992), WebSphere MQ (2002), IBM MQ (2014)
− IBM Message Oriented Middleware
− Clients: COBOL, C, C++, MQ Java, JMS, .NET, IBM MQI, others
− Platforms / OS: LUW, zOS, System i, System p, HP-UX, Solaris, others
− Protocols: TCP, UDP, HTTP(S), SMTP, FTP, Proprietary protocols
− Architecture
− MQ Objects: Queue Manager, Messages, Queues, Process Definitions,
Channels, Listeners, others

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IBM MQ – MQ Objects
• IBM Message Queue Objects – Queue Manager (QMGR)
− Queue Manager - Manager, orchestrator for a given message queue scheme.
The QM coordinates the MQ objects, sends messages to other queue
managers over a message channel. The queue manager may be co-located
with an application or located in a separate server host.

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MOM – Message Oriented Middleware
• IBM Message Queue Objects – Queue Types
− Application: Local, Remote, Alias, Model, Dynamic
− MQ internal: Dead-letter, Initiation, Transmission, Cluster, Comand, Event,
Reply-to

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IBM MQ – MQ Objects
• IBM Message Queue Objects
− Process Definition - Defines a feature that can start an application in response
to a trigger event. Attributes include application type, application ID (path) and
data (MIME type) to the application
− Channels - Logical communication link provides communication path from one
MQM to another or from external client to MQM. It shields applications from
underlying protocols.
− Listeners – They listen and accept remote connections and start inbound
channels.

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IBM MQ – Demo
− WMQ CLI (Command Line Interface)
− WMQ Explorer (GUI)
− Basic MQ Commands (MQSC, Control)
− Create QMGR, Create Queue, Send Message, Retrieve Message