Message Queues

What does it mean that web sockets are bidirectional? Why is this useful?

• It means that the socket can both send and recieve data a the same socket

  Does socket.io use HTTP? Why?

• HTTP can be used in conjunction with HTTP and its does use it upon initial connection

  What happens when a client emits an event?

• that event gets published and is picked up by those set up to listen for it.

  What happens when a server emits an event?

• This will likely trigger functions in the subscribed clients

  What happens if a client “misses” an event?

• seems like its ignored although id hope thats not the answere

  How can we mitigate this?

• you could send confirmation events to confirm reception or throw errors.

Terms

Socket - connection between browser and servers socket. Web Socket - the name for the bi directional communication protocol. Socket.io - JS lib for real time web apps Client - user-side tx/rx software Server - tx/rx for service side of apps OSI Model - Open Systems Interconnection Model TCP Model - Transmission Control Protocol, syn ack fin ack TCP - package sending and recieveing UDP - User Datagram Protocol Packets - a data bundle that once send will be confiremd as recieved or re sent

Which 3 things had you heard about previously and now have better clarity on?

• package sending
• sny, ack
• package loss

  Which 3 things are you hoping to learn more about in the upcoming lecture/demo?

• I am curious how async works with all this
• Redis adapters?
• creating and deleteing moves

  What are you most excited about trying to implement or see how it works?

• I would like to make a chat app like the tutorials I saw