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1. RabbitMQ
- RabbitMQ is an open-source message broker software written in Erlang.
- It is commonly called message-oriented middleware that implements the
AMQP (Advanced Message Queuing Protocol).
- It is developed and maintained by Apache Software.
- RabbitMQ supports multiple messaging protocols.
- RabbitMQ follows FIFO Methods(first in first out).
- It is building distributed systems that communicate via asynchronous
messaging.

2. Features
1. High availability
2. Scalability
3. Reliability
4. Security for enterprise level
5. Performance

3. 1.) What is use of RabbitMQ ?
- It is a message broker.
- It accepts and forwards messages.
- Many producers can send messages that go to one queue, and many
2.) Why we use RabbitMQ ?
- RabbitMQ is a messaging broker - an intermediary for messaging.
- It gives your applications a common platform to send and receive

4. AMQP protocol

5. Channel
●A connection is a TCP connection between your application and the RabbitMQ broker.
● A channel is a virtual connection inside a connection.

7. 1.) Producer - Send the message (publisher).
2.) consumer - Receive messages.
3.) Queue - Store buffer message inside queue.
4.) Exchange - Producer never sends messages directly to queue.
- It always needs to go with exchange.
- exchange receives messages from producers on one side & forward them to
5.) Binding - Relation between exchange and queue is called binding.

8. 1) Direct Exchange
2) Topic Exchange
3) Header Exchange
4) Fanout Exchange
Exchange Types : -

9. 1. Direct Exchange
●send the message to the queue whose binding key matches.
●If the routing key matches, then the message is delivered to the corresponding queue.
●If the message routing key does not match any binding key, the message is discarded.

11. 2. Topic Exchange
●send the message to the queue based on the pattern.
●messages sent to a topic exchange must have a specific routing key that must be
a list of words, delimited by dots.
●(example: ‘first.message.pass’).
●The wording is limited to 255 bytes.

12. 1) * is use for one or more words (wildcard character)
2) # is use for zero or more words (wildcard character)
1) Routing key : student.*
Q1 : student.1
Q2 : student.2
Note :pass the message on both queues
2) Routing key :: first.message.fast
Q1 : *.message.*
Q2 : *.abc.fast
Q3 : *.*.fast

13. Routing Keys ::
K1 : quick.orange.fox
K2 : quick.orange.rabbit
K3 : lazy.orange.elephant

14. 3. Header Exchange
●Routes messages to queues based on message header values instead of routing key.
●Header exchanges and topic exchange both are same but header exchange
●works with topic with his key and value.
● Routing key :: student.* {key:value}
●1) Q1 : student.A
●2) Q2 : student.B with {key:value}
●Note :: pass message on Q2 queue

15. 4. Fanout Exchange
●Broadcasts the messages to all the queues.
●Any routing key provided with the published message will be ignored.