WM2011G19.pdf

Course materials may not be reproduced in whole or in part without the prior written permission of IBM. 5.1.0.1
© Copyright IBM Corporation 2008
Introduction to IBM WebSphere MQ
publish/subscribe

Unit objectives
After completing this unit, you should be able to:
• Explain how WebSphere MQ supports a publish/subscribe
environment
• Describe how to create the objects required in an MQ
publish/subscribe environment
• Explain the merits of publish/subscribe versus point-to-point
messaging
• Design a publish/subscribe system incorporating multiple
queue managers
• Use utilities to manage and monitor topics, publications, and
subscriptions

What is publish/subscribe?
• Providers of information
need have no knowledge
of consumers
• Consumers of information
need have no knowledge
of providers
• New providers/consumers can
be added without disruption
Publish/subscribe is a term used to define an
application model in which the provider of
some information is decoupled from the
consumers of that information.
• Providers of information
are called publishers
• Consumers of
information are called
subscribers

The classic example
• A "feed" provides a continuous flow
of information which is pushed to
interested parties
• Traders consume this information
and use it as a basis for the buying
and selling stock
Traders
Stock
Feed

Loose-coupling with publish/subscribe
Few-to-many: Research, news tickers
Many-to-many: Prices and quotes
Many-to-few: Orders
Topic
Topic
Topic

Publications and subscriptions
• Subscribers make subscriptions with the queue
manager to register their interest in information relating
to specific topics.
– They use the MQSUB verb
– Or define using DEFINE SUB command
• Publishers provide information about specific topics by
sending publications to the queue manager
– They use the MQPUT verb
• The queue manager forwards each publication it
receives to all subscribers with a subscription which
matches the associated topic

Publish/subscribe in IBM WebSphere MQ
Configure
M
onitor
Interface
Create TOPIC objects
Topic status
Display connections
and handles
Configure attributes
Topic Tree
MQSUB
‘Price/Fruit/+’
MQGET
MQOPEN
‘Price/Fruit/Apples’
MQPUT

Topic strings and topic tree
Price/Fruit/Apples
Price/Fruit/Oranges
Price/Vegetables/Potatoes
Price/Vegetables/Onions
Price
Fruit
Apples Oranges
Vegetables
Potatoes Onions
Topic strings
Topic tree

Topic objects
• Not necessary for publish/subscribe
• Provide an administrative control point for your topic tree
– Configuration attributes
– Security profiles
– Topic tree isolation
MY.TOPIC.OBJECT

Base topic object
Price
Fruit
Apples Oranges
Vegetables
Potatoes Onions
SYSTEM.BASE.TOPIC

Defining a topic object (1 of 2)
Price
Fruit
Apples Oranges
SYSTEM.BASE.TOPIC
Starting MQSC for queue manager TEST1.
DEFINE TOPIC(FRUIT)
TOPICSTR(‘Price/Fruit’) DURSUB(NO)
DISPLAY TOPIC(FRUIT)
AMQ8633: Display topic details.
TOPIC(FRUIT) TYPE(LOCAL)
TOPICSTR(Price/Fruit) DESCR( )
CLUSTER( ) DURSUB(NO)
PUB(ASPARENT) SUB(ASPARENT)
DEFPSIST(ASPARENT) DEFPRTY(ASPARENT)
DEFPRESP(ASPARENT) ALTDATE(2008-02-26)
ALTTIME(15.05.22) PMSGDLV(ASPARENT)
NPMSGDLV(ASPARENT) PUBSCOPE(ASPARENT)
SUBSCOPE(ASPARENT) PROXYSUB(FIRSTUSE)
WILDCARD(PASSTHRU) MDURMDL( )
MNDURMDL( )
DEFINE TOPIC
ALTER TOPIC
DELETE TOPIC
DISPLAY TOPIC
FRUIT
Note: the next screen provides a
closer view of this command prompt.

Defining a topic object (2 of 2)
DEFINE TOPIC(FRUIT)
MNDURMDL( )

DEFINE TOPIC command
DEFINE TOPIC(FRUIT)
MNDURMDL( )

Defining a topic using IBM WebSphere MQ Explorer (1
of 11)

of 11)

Resolving ASPARENT
Price
Fruit
Apples Oranges
DIS TPSTATUS(‘Price/Fruit’)
AMQ8754: Display topic status details.
TOPICSTR(Price/Fruit) ADMIN(FRUIT)
MDURMDL(SYSTEM.DURABLE.MODEL.QUEUE)
MNDURMDL(SYSTEM.NDURABLE.MODEL.QUEUE)
DEFPSIST(NO) DEFPRTY(0)
DEFPRESP(SYNC) DURSUB(NO)
PUB(ENABLED) SUB(ENABLED)
PMSGDLV(ALLDU NPMSGDLV(ALLAVAIL)
RETAINED(NO) PUBCOUNT(0)
SUBCOUNT(0) PUBSCOPE(ALL)
SUBSCOPE(ALL)
DISPLAY TPSTATUS
FRUIT

Using MQ Explorer for topic status (1 of 5)

FRUIT
Administration for publishers (1 of 2)
Price
Fruit
Apples Oranges
DIS TPSTATUS('Price/Fruit/+') TYPE(PUB) all
TOPICSTR(Price/Fruit/Oranges) LPUBDATE(2008-02-26)
LPUBTIME(16:50:44)
ACTCONN(414D5143544553543120202020202020832AC44720005E02)
NUMPUBS(3)
TOPICSTR(Price/Fruit/Apples) LPUBDATE(2008-02-26)
LPUBTIME(16:50:37)
ACTCONN(414D5143544553543120202020202020832AC44720007601)
NUMPUBS(1)
TOPIC attributes
DEFPRTY
DEFPSIST
DEFPRESP
PUB
PUBSCOPE
PMSGDLV
NPMSGDLV
MQOPEN
‘Price/Fruit/Apples’
MQPUT
MQOPEN
‘Price/Fruit/Oranges’
MQPUT
MQPUT
MQPUT
Connection ID links to
DISPLAY CONN

Administration for publishers (2 of 2)
LPUBTIME(16:50:44)
ACTCONN(414D5143544553543120202020202020832AC44720005E02)
NUMPUBS(3)
LPUBTIME(16:50:37)
ACTCONN(414D5143544553543120202020202020832AC44720007601)
NUMPUBS(1)

Topic status display for publishers
LPUBTIME(16:50:44)
ACTCONN(414D5143544553543120202020202020832AC44720005E02)
NUMPUBS(3)
LPUBTIME(16:50:37)
ACTCONN(414D5143544553543120202020202020832AC44720007601)
NUMPUBS(1)
DIS CONN(832AC44720007601) TYPE(ALL)
AMQ8276: Display Connection details.
CONN(832AC44720007601)
EXTCONN(414D5143544553543120202020202020)
TYPE(CONN)
APPLTAG(D:q.exe) APPLTYPE(USER)
USERID(hughson)
OBJNAME( ) OBJTYPE(TOPIC)
OPENOPTS(MQOO_OUTPUT,MQOO_FAIL_IF_QUIESCING)
TOPICSTR(Price/Fruit/Apples)
LPUBTIME(16:50:44)
ACTCONN(414D5143544553543120202020202020832AC44720005E02)
NUMPUBS(3)
LPUBTIME(16:50:37)
ACTCONN(414D5143544553543120202020202020832AC44720007601)
NUMPUBS(1)
DIS CONN(832AC44720007601) TYPE(ALL)
CONN(832AC44720007601)
EXTCONN(414D5143544553543120202020202020)
TYPE(CONN)
USERID(hughson)
OPENOPTS(MQOO_OUTPUT,MQOO_FAIL_IF_QUIESCING)

Displaying publisher topic status using MQ Explorer (1
of 3)

of 3)

Creating administrative subscriptions
FRUIT
Price
Fruit
Apples Oranges
DEFINE SUB(APPLES.TO.Q1)
TOPICSTR(‘Price/Fruit/Apples’)
DEST(Q1)
MQGET
(Q1)
DEFINE SUB
ALTER SUB
DELETE SUB
DISPLAY SUB

Monitoring application subscriptions (1 of 2)
Price
Fruit
Apples Oranges
DIS TPSTATUS('Price/Fruit/+') TYPE(SUB) ALL
TOPICSTR(Price/Fruit/Oranges)
SUBID(414D5120544553543120202020202020832AC44720013D07)
SUBUSER(hughson) RESMDATE(2008-02-26)
RESMTIME(18:53:35) LMSGDATE(2008-02-26)
LMSGTIME(18:53:41) DURABLE(NO)
ACTCONN(414D5143544553543120202020202020832AC44720013D05)
NUMMSGS(2) SUBTYPE(API)
SUBID(414D5120544553543120202020202020832AC44720013D07)
ACTCONN(414D5143544553543120202020202020832AC44720013D05)
MQSUB
‘Price/Fruit/+’
MQGET
Connection ID links to
DISPLAY CONN
Subscription ID links to
DISPLAY SBSTATUS
and
DISPLAY SUB
TOPIC attributes
DURSUB
SUB
SUBSCOPE
PROXYSUB
WILDCARD
FRUIT

Monitoring application subscriptions (2 of 2)
SUBID(414D5120544553543120202020202020832AC44720013D07)
ACTCONN(414D5143544553543120202020202020832AC44720013D05)
SUBID(414D5120544553543120202020202020832AC44720013D07)
ACTCONN(414D5143544553543120202020202020832AC44720013D05)

Display subscriber topic status (1 of 3)
SUBID(414D5120544553543120202020202020832AC44720013D07)
ACTCONN(414D5143544553543120202020202020832AC44720013D05)
SUBID(414D5120544553543120202020202020832AC44720013D07)
ACTCONN(414D5143544553543120202020202020832AC44720013D05)

DIS CONN(832AC44720013D05) TYPE(ALL)
CONN(832AC44720016401)
EXTCONN(414D5143544553543120202020202020)
TYPE(CONN)
USERID(hughson)
OBJNAME(Q1) OBJTYPE(QUEUE)
OPENOPTS(MQOO_INPUT_SHARED,MQOO_FAIL_IF_QUIESCING)
DEST(Q1) DESTQMGR(TEST1)
SUBNAME(Fruit Prices)
SUBID(414D5120544553543120202020202020832AC44720016403)
TOPICSTR(Price/Fruit/+)

DIS SBSTATUS SUBID(414D5120544553543120202020202020832AC44720013D07)
AMQ8099: WebSphere MQ subscription status inquired.
SUB(Fruit Prices)
SUBID(414D5120544553543120202020202020832AC44720013D07)
LMSGTIME(19:10:28)
ACTCONN(414D5143544553543120202020202020832AC44720013D05)
DURABLE(NO) NUMMSGS(5)
SUBTYPE(API)

Subscription information using MQ Explorer (1 of 3)

Checkpoint questions
1. True or false: A subscriber is an application that can only
make one subscription at a time to a topic on a particular
queue manager.
2. What are the two ways that a subscription is made by an
application?
3. In a TOPIC definition, what does the value ASPARENT
mean?
4. True or false: All values of a TOPIC object definition can be
altered using the ALTER TOPIC command.
5. What is the command used to show details of the current
publishers on a topic string?

Checkpoint solutions
1. True or false: A subscriber is an application that can only make one
subscription at a time to a topic on a particular queue manager.
– False, an application can make multiple subscriptions to the queue
manager for different topics
2. What are the two ways that a subscription is made by an application?
– DEFINE SUBSCRIPTION command, and MQSUB verb
3. In a TOPIC definition, what does the value ASPARENT mean?
– ASPARENT means that the value is based on the setting of the closest
parent administrative topic object in the topic tree.
4. True or false: All values of a TOPIC object definition can be altered
using the ALTER TOPIC command.
– False. The TOPICSTR value cannot be altered. The TOPIC object needs to
be deleted and redefined if this value needs to be changed.
5. What is the command used to show details of the current publishers
on a topic string?
– DISPLAY TPSTATUS TYPE(PUB)

Unit summary
Having completed this unit, you should be able to:
• Explain how WebSphere MQ supports a publish/subscribe
environment
• Describe how to create the objects required in an MQ
publish/subscribe environment
• Explain the merits of publish/subscribe versus point-to-point
messaging
• Design a publish/subscribe system incorporating multiple
queue managers
• Use utilities to manage and monitor topics, publications, and
subscriptions

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