Under which scenario does publish subscribe fall under?
Publish–subscribe is a sibling of the message queue paradigm, and is typically one part of a larger message-oriented middleware system. Most messaging systems support both the pub/sub and message queue models in their API; e.g., Java Message Service (JMS).
What is publish-subscribe model in IoT?
The publish-subscribe model is different from the traditional client-server model. It separates the client (publisher) that sends the message from the client (subscriber) that receives the message. The essence of it is that an intermediate role called a broker is responsible for all message routing and distribution.
What do you mean by Publish Subscribe design pattern?
The publish-subscribe (or pub/sub) messaging pattern is a design pattern that provides a framework for exchanging messages that allows for loose coupling and scaling between the sender of messages (publishers) and receivers (subscribers) on topics they subscribe to.
Which is the best description of publish subscribe?
Publish-Subscribe or Pub-Sub is a design pattern that allows loose coupling between the application components. Here senders of messages, called publishers, do not program the messages to be sent directly to specific receivers, called subscribers. Messages are published without the knowledge of what or if any subscriber of that knowledge exists.
Why do publishers not know who their subscribers are?
Publishers do not know who the subscribers are or to which (if any) topics they subscribe. This means publisher and subscriber operations can operate independently of each other. This is known as loose coupling and removes service dependencies that would otherwise be there in traditional messaging patterns.
Is there a design pattern similar to pub sub?
There is also another design pattern which is much similar to pub-sub that is the Observer pattern. The major difference in Pub-Sub design is the event channel that publisher generates to notify changes to its subscriber without any knowledge of subscriber existence.