Synchronous vs Asynchronous Events

Key Concepts

• Synchronous Events:
  • Real-time interaction
  • Both parties must be present simultaneously
  • Example: Phone calls
• Asynchronous Events:
  • Time-independent interaction
  • Parties do not need to be present at the same time
  • Example: Texting, ordering a package from Amazon

Detailed Comparisons

Synchronous Events

• Must occur at the same time
• Direct and immediate communication
• Example: Phone call
  • Both persons need to be on the call simultaneously
  • Immediate response required

Asynchronous Events

• Can occur at different times
• Delayed communication
• Examples:
  • Texting: Message sent and can be read/responded to later
  • Amazon Package: Order placed, and delivery happens later
• No immediate response is required

Application in Computing

• Main Thread Execution: Execute instructions sequentially
• Parallel Service Execution: Service operates independently, returns results later

Database Example

Synchronous Database (Tiny DB)

• Stores data locally
• Immediate data retrieval
• Code block features:
  • Puzzle-like appendage indicating immediate data return
• Data is accessible instantaneously

Asynchronous Database (Cloud DB)

• Stores data on the web
• Delayed data retrieval
• Code block features:
  • No puzzle-like appendage
  • Utilizes event blocks:
    • GotValue Event: Triggered after data is retrieved
    • DataChanged Event: Triggered whenever data changes
• Facilitates easier data sharing among multiple users

Pros and Cons

Cloud Database

• Longer data retrieval times
• Advantage: Easier data sharing among users

Tiny DB

• Faster data access (local storage)
• Limited to individual devices