Message Queues

Reading

• Socket.io Chat Example

  1. Explain to a non-technical recruiter what the Chat Example (above) does.

     • it brings multiple users to the server

  2. What proof of life are we getting on the backend from the above app?

     • logged events of connected clients

  3. Socket.IO gives us the i0.emit() method to send an event to everyone. What flag would you use if you want to send a message to everyone except for a certain emitting socket?

     • broadcast

• Rooms

  1. What is a room and how might a room be useful?

     • to make sure the info is given to the ones in the room

  2. How do you join a room?

     • socket.join

  3. how do you leave a room?

     • socket.leave

• Namespace

  1. What is a Namespace and what does it allow you to do?

     • A Namespace is a communication channel that allows you to split the logic of your application over a single shared connection (also called “multiplexing”)

  2. Each namespace potentially has its own what? (hint: 3 things)

     • event handlers, rooms, middlewares

  3. Discuss a possible use case for separate namespaces

Bookmark and Review

• Socket.io Emit Cheatsheet