Wait groups in golang | Summary and Q&A

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November 3, 2021
by
Hitesh Choudhary
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Wait groups in golang

TL;DR

This video introduces Go Routines and demonstrates their usage in real-world scenarios with multiple servers, databases, and microservices. The presenter also explains the purpose and implementation of weight groups for managing concurrent operations.

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Key Insights

  • 👻 Go Routines are useful in scenarios involving multiple servers, databases, and microservices, allowing for concurrent operations.
  • 🚀 By using Go Routines, different threads can be launched to fetch data from various endpoints simultaneously.
  • 🏋️ Weight groups are used to manage concurrent operations and prevent the main method from exiting prematurely before all Goroutines are complete.
  • 👥 The "Add" method of a weight group informs the group about the creation of a Goroutine, while the "Wait" method blocks the execution until all Goroutines have finished their tasks.
  • 🏋️ Weight groups ensure proper synchronization and orderly execution of Goroutines in a concurrent program.
  • 🏋️ Weight groups eliminate the need for using time delays to wait for Goroutines to complete their tasks.
  • 🏋️ Weight groups can be implemented using pointers for more advanced scenarios, passing references to methods that manipulate weight groups.

Questions & Answers

Q: What are some common scenarios where Go Routines are used?

Go Routines are commonly used in scenarios involving multiple servers, databases, and microservices. They can be used to fetch data from different endpoints simultaneously or to interact with read and write databases or microservices.

Q: What is the purpose of weight groups?

Weight groups are used to manage concurrent operations and ensure that the main method does not exit before all Goroutines are complete. They allow synchronization between Goroutines and prevent premature termination of the program.

Q: How can weight groups be added to Goroutines?

Use the "Add" method of the weight group to add Goroutines to the group. This informs the weight group that a Goroutine has been created and needs to be completed before the main method can exit.

Q: How does weight group "Wait" prevent premature program termination?

The "Wait" method of the weight group is placed at the end of the main method or the calling method. It blocks the execution of the method until all Goroutines added to the weight group have completed, ensuring they have enough time to finish their tasks.

Summary & Key Takeaways

  • The video discusses the use of Go Routines in scenarios involving multiple servers, databases, and microservices.

  • It demonstrates how to make HTTP requests to websites and retrieve their status codes using Go Routines.

  • The presenter explains the need for weight groups to manage concurrent operations and prevent the main method from exiting before all Goroutines are complete.

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