Socket.io

Review, Research, and Discussion

• What is the benefit of transforming data into packets?
  • to meet the demands of pervasive data-centric applications and services.
• UDP is often refereed to as a connectionless protocol. Why is this?

• because it is analogous to sending a letter where you don’t acknowledge receipt.

• Can a socket server application have multiple socket connections?
  • yes it can handel 65535 socket connections.
• Can a socket connection application be connected to multiple socket servers?
  • Yes, a socket connection application can connect to multiple socket server Theoretically but it is not practical.
• Can an application be both a socket server and a socket connection?
  • Yes, it can be applied.

Vocabulary Terms

Observer Pattern :

• it maintain a collection of observers to notify them in case of any change of state happens.

  Listener :

• waits for an event to occur.

  Event Handler :

• code to be executed when an event occurs.

Event Driven Programming :

• where the execution of the code depends on events occurrence.

  Event Loop :

• way of handling the execution of the code.

  Event Queue :

• a queue of events waiting to be executed.

  Call Stack :

• rganizing the code in the order of its execution.

  Emit/Raise/Trigger :

• to fire an event.

  Subscribe :

• a function that defines how to obtain or generate values or messages to be published.

  database :

• a collection of data that enable the programmer to CRUD.

WebSocket

• it is a computer communications protocol, providing full-duplex communication channels over a single TCP connection.
• WebSocket is distinct from HTTP. Both protocols are located at layer 7 in the OSI model and depend on TCP at layer 4.
• WebSocket remains open all the time.
• enables interaction between a web browser (or other client application) and a web server with lower overhead than half-duplex alternatives such as HTTP polling.

• 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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