Message Queues

Review, Research, and Discussion

• What does it mean that web sockets are bidirectional? Why is this useful?
  • to meet the demands of pervasive data-centric applications and services.
• Does socket.io use HTTP? Why?

• Yes,when websockets aren’t supported.

• What happens when a client emits an event?
  • When a client emits, it sends the data and the server will receive it when the client connect
• What happens when a server emits an event?
  • It will sends the data.

Vocabulary Terms

Socket :

• when twoprograms running it is the endpoint of this communication link.

  Web Socket :

• computer communications protocol between a client and a server.

Socket.io :

• JavaScript library for realtime web applications.

Client :

• a computer that connects to the network.

  Server :

• who receive and process the requests from the client.

  OSI Model :

• Open Systems Interconnection Model is a conceptual framework used to describe the functions of a networking system.

  TCP Model :

• It stands for Transmission Control Protocol/Internet Protocol. The TCP/IP model is a concise version of the OSI model.

  TCP :

• Transmission Control Protocol.

  UDP :

• User Datagram Protocol.

Message Queue?

• A message queue is a form of asynchronous service-to-service communication used in serverless and microservices architectures.

• Messages are stored on the queue until they are processed and deleted.

• Each message is processed only once, by a single consumer.

• Message queues can be used to decouple heavyweight processing, to buffer or batch work, and to smooth spiky workloads.

Rooms and Namespaces:

• A room is an arbitrary channel that sockets can join and leave. It can be used to broadcast events to a subset of clients.
• rooms are a server-only concept.
• Each Socket in Socket.IO is identified by a random, unguessable, unique identifier Socket#id.

• by providing a standardized way for the server to send content to the client without being first requested by the client.

• allowing messages to be passed back and forth while keeping the connection open.

• a two-way ongoing conversation can take place between the client and the server.

• Socket.IO is a library that enables real-time and full-duplex communication between the Client and the Web servers.
• It uses the WebSocket protocol to provide the interface, it is divided into two parts; both WebSocket vs Socket.io are event-driven libraries.

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