This document discusses the need for a messaging system to address problems that arise without one, such as increased load on databases, unnecessary reads, and time lags. It defines a messaging system as a method of asynchronous communication between applications using a producer-consumer model. There are two main types: point-to-point systems with message queues and publish-subscribe systems with topics. Examples of each type are provided.

1. NEED OF MESSAGING SYSTEM
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2. AGENDA
 Why Messaging System? – Problems without Messaging system
 What is a Messaging System?
 Types of Messaging Systems
 Examples of Messaging Systems

3. Application 1 Application 2
Database Server
INSERT READ
READ INSERT
Connecting applications

4. Application 1 Application 2
Database Server
INSERT READ
READ INSERT
Problem 1
Load on Database

5. Application 1 Application 2
Database Server
INSERT 1 READ 1
Problem 2
INSERT 2
INSERT N
*
*
READ 2
READ N
*
*
Time= 0
Time= 50
Time= N
Time= 0
Time= 5
Time= N
Unnecessary Reads
Time Lags

6. Application 1 Application 2
Database Server
INSERT 1 READ 1
Problem 3
INSERT 2
INSERT N
*
*
READ 2
READ N
*
*
10 MB 100 MB
10 GB
Increase in Database Size

7. Problem 4
Front End
Chat Server
Database Server
Security Systems
RealTime Monitoring
Complex Data pipelines

8. Complex Data pipelines

9. Solution
Messaging
System

10. What is Messaging System?
Messaging
System
Producer
Producer
Producer
Consumer
Consumer
Consumer
Messaging System provides a method of communication between software components
or applications
Uses Push-Push method rather than Push-Poll

11. A messaging system is a peer-to-peer facility: A messaging client can send
messages to, and receive messages from, any other client. Each client connects
to a messaging agent that provides facilities for creating, sending, receiving,
and reading messages. Solves complex data problem
It also allows asynchronous communication, so that sender doesn't have to wait
for the receiver to process the message. Solves problem of time lag,
unnecessary reads
Once message is consumed, message can be removed automatically. Solves
the storage problem
It also ensures reliable communication in case the receiver or the network isn’t
working properly, message doesn’t get lost
As different systems use different platforms and different languages so
messaging system provides a common paradigm independent of those
platforms and languages
What is Messaging System?

12. Messaging System
Messaging System
Point to Point Publish Subscribe
Types of Messaging System

13. • In a point-to-point system, messages are persisted in a queue.
• One or more receivers can read the messages from the queue, but a particular message can be read
by a maximum of one receiver only.
• Once a receiver reads a message in the queue, message disappears from that queue.
Messaging System- Point to Point

14. Phone call is an example of point to point
Messaging System- Point to Point
Example

15. • In the publish-subscribe system, messages are persisted in a topic.
• Unlike point-to-point system, consumers can subscribe to one or more topic and consume all the
messages in that topic.
• In the Publish-Subscribe system, message publishers are called producers and message subscribers are
called consumers.
Messaging System- Publish Subscribe

16. Radio Broadcast is example of Publish Subscribe
Messaging System- Publish Subscribe
Example

17. Messaging Systems
DishTV Point-to-Point
Chat Pub-Sub
Order Processing System Pub-Sub
Java Messaging System Point-to-Point
Examples of Messaging System

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