RabbitMQ.ppt
- 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
- 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.