The document discusses WebSphere MQ and key concepts in messaging and queuing. It explains that WebSphere MQ allows for asynchronous communication between applications by routing messages through queues. Programs can send and receive messages independently without having to call each other directly. WebSphere MQ provides features like assured message delivery, queue management, and interfaces for mainframe platforms like CICS, IMS, and batch processing.

1. WEB SPHERE MQ
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2. CHAPTER OBJECTIVES
Be able to:
 Explain why messaging and
queuing is used
 Describe the asynchronous flow
of messages
 Explain the function of a queue
manager
 List three zSeries-related
adapters
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3. local queue
channel
message-driven
MQI
asynchronous application
dead-letter queue
QM
remote queue
syncpoint
KEY TERMS IN THIS CHAPTER
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4. BB
AA
MQI
MQI
MQI
MQI
Queue 2
Queue 1
SYNCHRONOUS COMMUNICATION MODEL
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5. BB
CC
AA
Queue 1
Queue 2
MQI
MQI
MQI
MQI
ASYNCHRONOUS COMMUNICATION MODEL
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6. Program
A
Program
B
Program
C
Program
A
Conversational
Messaging
Call and
return
Program
A
Program
B
Program
A
Program
A
STYLES OF COMMUNICATION
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7. MESSAGES
 Types of messages:
– Datagram
– Request
– Reply
– Report
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8. Messages
Program
Data
Program
Program
Queue
manager
DB2
QUEUE MANAGER
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9. Application
Queue manager
MQI
Queue
manager
object
Namelist
object
Process
object
Major calls
MQCONN
MQCONNX
MQOPEN
MQCLOSE
MQPUT
MQPUT1
MQGET
Minor calls
MQBEGIN
MQCMIT
MQBACK
MQINQ
MQSET
MESSAGE QUEUE INTERFACE (MQI)
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10. Set by application and
queue manager
Headers
MQMD
MQXQH
MQDLH
and so forth
Any sequence of bytes
Private to the sending and
receiving applications
Not meaningful to the
queue manager
Message = Headers + Application data
ApplicationHeaders
MESSAGE LAYOUT
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11. Program A Program B Program C
System 1 System 2
MQPUT Q2 MQPUT Q1 MQGET Q1 MQGET Q2
Queue
manager
Queue
manager
MQI
QX Q1 Q2
DLQ
Network - MCA
QUEUE TYPES
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12. MQI
Program 1
putget
QMA
Local Q2
Channel
QMB.QMA
Receiver
Remote Q1
XmitQ
QMB
Channel
QMA.QMB
Sender
MQI
Program 2
putget
QMB
Local Q1
Channel
QMB.QMB
Receiver
Remote Q2
XmitQ
QMA
Channel
QMB.QMA
Sender
Network
CHANNELS
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13. Local Queue Manager
Remote Queue Manager
MCAMCA
MCAMCA
MQMD
Application
Data
USERID
Context
Database
SECURITY
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14. DBDB
Write
Send
Syncpoint
Receive
Write DBDB
Syncpoint
2-phasa
commit
Synchronous
model
Unit of work
DBDB Write
Put
SyncpointUnit of work 1
Unit of work 2
Unit of work 3
q
q Get
Write
Syncpoint
DBDB
Asynchronous
model
DATA INTEGRITY
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15. MQPUT CAR RENTAL
MQPUT FLIGHT
MQPUT HOTEL
MQGET Reply-to-queue
Car rental
Flight
Hotel
Car
Flight
Hotel
MQPUT
MQPUT
MQPUT
Reply-to
queue
TRAVEL AGENCY EXAMPLE REVISITED
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16. INTERFACING TO WEBSPHERE MQ
 MQ is available on many platforms
 On z/OS it has interfacing to:
– CICS
– IMS
– Batch or TSO
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17. MQ FUNCTIONS
 Common application programming interface (MQI)
 Assured delivery: messages do not get lost and
they arrive only once
 No synchronous access needed
 Message driven application
 Quicker development due to shielding of the
network
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18.  Messaging and queuing enables communication between
applications on different platforms.
 WebSphere MQ is an example of software that manages
messaging and queuing in the mainframe and other
environments.
 With messaging, programs communicate by through messages,
rather than by calling each other directly.
 With queuing, messages are retained on queues in storage, so
that programs can run independently of each other
(asynchronously).
SUMMARY
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