Node.js Architecture | NodeJS Architecture Explained | NodeJS Tutorial For Beginners | Simplilearn

2. What’s in it for you? Web Applications

3. What’s in it for you? Web Applications Node.js Architecture

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5. What’s in it for you? Web Applications Node.js Architecture Advantages

6. Web Applications

7. In the Forefront User interacts only with the “Client” of the web application, the rest is handled by “Server” Server Database Client

8. Behind the Scenes Client Server Database

9. Behind the Scenes Client Server Database

10. React JS, Angular Client Server Database

11. React JS, Angular Node.js, PHP, Java Client Server Database

12. React JS, Angular Node.js, PHP, Java MySQL, MongoDB Client Server Database

13. React JS, Angular • User interacts with the “Client” of a web application Client

14. Node.js, PHP, Java • User interacts with the “Client” of a web application • Server is responsible for taking the client requests, performing the required tasks, and sending the responses back to the clients Server

15. MySQL, MongoDB • User interacts with the “Client” of a web application • Server is responsible for taking the client requests, performing the required tasks, and sending the responses back to the clients • Database stores the data for a web application. The data can be created, updated and deleted whenever the client requests Database

16. Node.js Architecture

17. Architecture • Node.js uses “Single Threaded Event Loop” architecture to handle multiple concurrent clients

18. Architecture • Node.js uses “Single Threaded Event Loop” architecture to handle multiple concurrent clients • Node.js Processing model is based on the JavaScript Event based model along with the JavaScript callback mechanism.

19. Node.js Server Event Queue Computation Operation Complete Database Event Loop File System Requests Thread Pool

20. Node.js Server Event Queue Computation Database Event Loop File System Requests Thread Pool

21. Node.js Server Event Queue Computation Operation Complete Database Let’s now get to know each part of the Node.js architecture Event Loop File System Requests Thread Pool

22. Node.js Server Event Queue Computation Database Event Loop File System Requests Thread Pool

23. Node.js Server Event Queue Computation Database Event Loop File System Requests Thread Pool

24. Node.js Server Event Queue Computation Operation Complete Database • Clients send request to Web Server Event Loop File System Requests Thread Pool

25. Node.js Server Event Queue Computation Operation Complete Database • Clients send request to Web Server • Requests can be : • querying for data Event Loop File System Requests Thread Pool

26. Node.js Server Event Queue Computation Operation Complete Database • Clients send request to Web Server • Requests can be : • querying for data • deleting data Event Loop File System Requests Thread Pool

27. Node.js Server Event Queue Computation Operation Complete Database • Clients send request to Web Server • Requests can be : • querying for data • deleting data • updating the data, etc. Event Loop File System Requests Thread Pool

28. Node.js Server Node.js is a server-side platform that takes requests from users, processes those requests and returns responses to the corresponding users Event Queue Computation Database Event Loop File System Requests Thread Pool

29. Node.js Server Node.js receives requests and places them into the Event Queue Event Queue Computation Database Event Loop File System Requests Thread Pool

30. Node.js Server Event Queue Computation Database Event Loop File System Requests Node.js internally maintains a Thread Pool Thread Pool

31. Node.js Server Event Queue Computation Event Loop indefinitely receives requests and processes them Database Event Loop File System Requests Thread Pool

32. Node.js Server Event Queue Computation External components such as database, file system, and computation Database Event Loop File System Requests Thread Pool

33. Node.js Server Event Queue Computation Operation Complete Database Now let’s go ahead and understand the workflow Event Loop File System Requests Thread Pool

34. Requests

35. Event Queue Requests

36. Event Loop Event Queue Requests

37. Non- Blocking Operations Event Loop Event Queue Requests I/O Polling (epoll, kqueue, etc.)

38. Blocking Operations Non- Blocking Operations Event Loop Event Queue Thread Pool Requests I/O Polling (epoll, kqueue, etc.)

39. Blocking Operations Computation External Resources Database File System Non- Blocking Operations Event Loop Event Queue Thread Pool Requests I/O Polling (epoll, kqueue, etc.)

40. Advantages

41. Advantages • Handling multiple concurrent client requests is fast and easy

42. Advantages • Handling multiple concurrent client requests is fast and easy • There is no need of creating multiple threads because of Event loop

43. Advantages • Handling multiple concurrent client requests is fast and easy • There is no need of creating multiple threads because of Event loop • Node.js utilizes less resources and memory