Lecture 3— Application Programming Interface

"Software Testing for Complex Intelligent Systems and Autonomous Vehicles" online course.

The lecture is available via the link: https://youtu.be/Ka6JNG12Qn4
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Transcript

1. 1 Build Software to Test Software exactpro.com Lecture 3 Application Programming Interface Software Testing for Complex Intelligent Systems and Autonomous Vehicles Online Course
2. 2 Build Software to Test Software exactpro.com Lecture Overview What is API: definition, API vs protocol, API types and their place under the sun API examples in complex financial systems API examples that will be used at the course seminars
3. 3 Build Software to Test Software exactpro.com 3 Types of Systems
4. 4 Build Software to Test Software exactpro.com Useful Links https://en.wikipedia.org/wiki/API
5. 5 Build Software to Test Software exactpro.com Useful Links https://youtu.be/GZvSYJDk-us
6. 6 Build Software to Test Software exactpro.com Useful Links https://www.youtube.com/playlist?list=PLcgRuP1JhcBP8Kh0MC53GH_pxqfOhTVLa
7. 7 Build Software to Test Software exactpro.com Useful Links https://www.altexsoft.com/blog/engineering/what-is-api-definition-types-specifications-documentation/
8. 8 Build Software to Test Software exactpro.com https://rapidapi.com/blog/types-of-apis/ Useful Links
9. 9 Build Software to Test Software exactpro.com What is an Interface
10. 10 Build Software to Test Software exactpro.com What is API API is an interface allowing two independent software components to exchange information. API plays the role of an intermediary between internal and external software functions.
11. 11 Build Software to Test Software exactpro.com Web Application Structure Web Servers Static Content Browser DOM model HTTP(S) Request HTTP(S) Response Internet CSS HTML Javascript Everything a user sees in the browser is a mix of HTML, CSS, and JavaScript Browser sends requests to the server, receives responses and visualizes them as a page The back-end server-side scripts process the request, pull what they need from the database and application servers and then send it back 1 2
12. 12 Build Software to Test Software exactpro.com Application Servers Data Web Servers Static Content Browser DOM model HTTP(S) Request HTTP(S) Response Internet CSS HTML Javascript Web Application Structure The back-end server-side scripts process the request, pull what they need from the database and application servers and then send it back 2 Everything a user sees in the browser is a mix of HTML, CSS, and JavaScript Browser sends requests to the server, receives responses and visualizes them as a page 1
13. 13 Build Software to Test Software exactpro.com Application Servers Data Web Servers Static Content Browser DOM model HTTP(S) Request HTTP(S) Response Internet CSS HTML Javascript Web Application Structure Browser sends requests to the server, receives responses and visualizes them as a page The back-end server-side scripts process the request, pull what they need from the database and application servers and then send it back 1 Client-side scripts Run in the browser and process information without sending requests to the server 3 2 Everything a user sees in the browser is a mix of HTML, CSS, and JavaScript
14. 14 Build Software to Test Software exactpro.com Application Servers Data Web Servers Static Content Browser DOM model HTTP(S) Request HTTP(S) Response Internet CSS HTML Javascript Web Application Structure Everything a user sees in the browser is a mix of HTML, CSS, and JavaScript Browser sends requests to the server, receives responses and visualizes them as a page The back-end server-side scripts process the request, pull what they need from the database and application servers and then send it back 1 Client-side scripts Run in the browser and process information without sending requests to the server 3 AJAX allows to create asynchronous web interactions without interfering with the display and the behaviour of the existing page 4 2
15. 15 Build Software to Test Software exactpro.com Application Servers Data Web Servers Static Content Browser DOM model HTTP(S) Request HTTP(S) Response Websocket Internet CSS HTML Javascript Web Application Structure Browser sends requests to the server, receives responses and visualizes them as a page The back-end server-side scripts process the request, pull what they need from the database and application servers and then send it back 1 Client-side scripts Run in the browser and process information without sending requests to the server 3 AJAX allows to create asynchronous web interactions without interfering with the display and the behaviour of the existing page 4 2 Everything a user sees in the browser is a mix of HTML, CSS, and JavaScript WebSocket enables interaction between a web browser and a web server with lower overhead than half-duplex alternatives such as HTTP polling 5
16. 16 Build Software to Test Software exactpro.com Application Servers Data Web Servers Static Content Browser DOM model HTTP(S) Request HTTP(S) Response Websocket Internet CSS HTML Javascript Web Application Structure Browser sends requests to the server, receives responses and visualizes them as a page The back-end server-side scripts process the request, pull what they need from the database and application servers and then send it back 1 Client-side scripts Run in the browser and process information without sending requests to the server 3 AJAX allows to create asynchronous web interactions without interfering with the display and the behaviour of the existing page 4 2 Everything a user sees in the browser is a mix of HTML, CSS, and JavaScript WebSocket enables interaction between a web browser and a web server with lower overhead than half-duplex alternatives such as HTTP polling 5
17. 17 Build Software to Test Software exactpro.com CSS HTML Javascript Application Servers Data Web Servers Static Content Browser DOM model HTTP(S) Request HTTP(S) Response Websocket Internet Web Application Structure Browser sends requests to the server, receives responses and visualizes them as a page The back-end server-side scripts process the request, pull what they need from the database and application servers and then send it back 1 Client-side scripts Run in the browser and process information without sending requests to the server 3 AJAX allows to create asynchronous web interactions without interfering with the display and the behaviour of the existing page 4 2 Responsive front-end design allows a site to adapt to user’s device Everything a user sees in the browser is a mix of HTML, CSS, and JavaScript WebSocket enables interaction between a web browser and a web server with lower overhead than half-duplex alternatives such as HTTP polling 5
18. 18 Build Software to Test Software exactpro.com WebSocket enables interaction between a web browser and a web server with lower overhead than half-duplex alternatives such as HTTP polling Responsive front-end design allows a site to adapt to user’s device Everything a user sees in the browser is a mix of HTML, CSS, and JavaScript 5 CSS HTML Javascript Application Servers Data Web Servers Static Content Browser DOM model HTTP(S) Request HTTP(S) Response Websocket Internet Web applications are always multi-user applications, and many of them work under heavy load and are subject to concurrency access 6 Web Application Structure Browser sends requests to the server, receives responses and visualizes them as a page The back-end server-side scripts process the request, pull what they need from the database and application servers and then send it back 1 Client-side scripts Run in the browser and process information without sending requests to the server 3 AJAX allows to create asynchronous web interactions without interfering with the display and the behaviour of the existing page 4 2
19. 19 Build Software to Test Software exactpro.com A Human from the Point of View of an App
20. 20 Build Software to Test Software exactpro.com A Human from the Point of View of an App
21. 21 Build Software to Test Software exactpro.com Human → Driverless Vehicle
22. 22 Build Software to Test Software exactpro.com A Human from the Point of View of an App
23. 23 Build Software to Test Software exactpro.com Human → Driverless Vehicle
24. 24 Build Software to Test Software exactpro.com API around us: Looking to the Future https://www.capgemini.com/research/world-quality-report-wqr-20-21/
25. 25 Build Software to Test Software exactpro.com Human-Machine Interaction Interface
26. 26 Build Software to Test Software exactpro.com Human-Machine Interaction Interface
27. 27 Build Software to Test Software exactpro.com API vs. Protocol Protocol: API: Interaction rules, language A way of communicating a message
28. 28 Build Software to Test Software exactpro.com Protocol - API - Protocol Protocol Protocol API TCP/IP FIX Messages FIX Protocol
29. 29 Build Software to Test Software exactpro.com PPP: Processes, Platforms, People
30. 30 Build Software to Test Software exactpro.com PPP: Processes, Platforms, People https://zero-outage.com/
31. 31 Build Software to Test Software exactpro.com API Types: Private, Partner, Public https://www.altexsoft.com/blog/engineering/what-is-api-definition-types-specifications-documentation/
32. 32 Build Software to Test Software exactpro.com API types: Library, Code, Data </>
33. 33 Build Software to Test Software exactpro.com Example: NASDAQ – GENIUM OMNET API (Library) https://www.nasdaq.com/solutions/genium-inet-protocol-specific ations
34. 34 Build Software to Test Software exactpro.com Example: NASDAQ – FIX Protocol (Data) https://www.nasdaq.com/docs/2020/10/01/GeniumFIX_ProtSpec_ Nordic_v223.pdf https://www.fixtrading.org/
35. 35 Build Software to Test Software exactpro.com Example: Bitcoin (Code) </>
36. 36 Build Software to Test Software exactpro.com Question Python-based API of the LGSVL Simulator – what type? </>
37. 37 Build Software to Test Software exactpro.com FIX Trading Community – Monitoring, Onboarding and Software Testing Group https://www.fixtrading.org/groups/mostwg/
38. 38 Build Software to Test Software exactpro.com API Examples https://rapidapi.com/blog/types-of-apis/
39. 39 Build Software to Test Software exactpro.com API Examples https://docs.corda.net/docs/corda-os/4.7/api-flows.html https://rapidapi.com/blog/top-anime-manga-apis/ https://rapidapi.com/blog/best-beer-wine-alcohol-api/ 7 APIs Everyone in the Anime/Manga Industry Should Be Using Top 8+ Beer, Wine, & Alcohol APIs for Developers [2021] API: Flows|Corda
40. 40 Build Software to Test Software exactpro.com Documenting API “APIs should be self-documenting: It should rarely require documentation to read code written to a good API. In fact, it should rarely require documentation to write it.” https://www.infoq.com/articles/API-Design-Joshua-Bloch/ https://www.youtube.com/watch?v=aAb7hSCtvGw “APIs should be easy to use and hard to misuse. It should be easy to do simple things; possible to do complex things; and impossible, or at least difficult, to do wrong things.”
41. 41 Build Software to Test Software exactpro.com API Specs • https://en.wikipedia.org/wiki/API#Documentation • An example of a human-readable specification: https://connect2.euronext.com/sites/default/files/it-docum entation/Euronext%20Markets%20-%20Optiq%20OEG%20 Client%20Specifications%20-%20FIX%205.0%20Interface%2 0-%20v2.0.0.pdf • An example of a machine-readable specification: https://www.fixtrading.org/standards/fix-orchestra/, https://youtu.be/eOIA_7bRQyI
42. 42 Build Software to Test Software exactpro.com Interface Stability https://developer.gnome.org/programming-guidelines/stable/api-stability.html.en
43. 43 Build Software to Test Software exactpro.com Plugins
44. 44 Build Software to Test Software exactpro.com LGSVL Simulator: A High Fidelity Simulator for Autonomous Driving https://arxiv.org/pdf/2005.03778.pdf
45. 45 Build Software to Test Software exactpro.com Conferences 2021 IEEE AI Testing Conference. Paper submission until 30 April. http://ieeeaitests.com/ TMPA - International Conference on Software Testing, Machine Learning and Complex Process Analysis https://tmpaconf.org/
46. 46 Build Software to Test Software exactpro.com LGSVL Simulator: A High Fidelity Simulator for Autonomous Driving https://arxiv.org/pdf/2005.03778.pdf
47. 47 Build Software to Test Software exactpro.com LGSVL Simulator and its APIs Real Road Testing Simulation Python API Analytics&Visualization Logs Logs AD Stack Simulator Plugins Digital Twin Map (or Procedurally Generated Map) (Ground Truth Data) (Sensor & Tracking Data) Vehicle & Sensors Vehicle & Sensor Model Environment Creation Bridge Real-World User modules Third Party Collaboration LGSVL Simulator Test Scenario Scenario Player 3rd party Test Scenario 3rd party ScenarioPlayer HD Map
48. 48 Build Software to Test Software exactpro.com Bridges for Connecting to Driverless Vehicles
49. 49 Build Software to Test Software exactpro.com Real Road Testing Simulation Python API Analytics & Visualization Logs Logs AD Stack Simulator Plugins Digital Twin Map (or Procedurally Generated Map) (Ground Truth Data) (Sensor & Tracking Data) Vehicle & Sensors Vehicle & Sensor Model Environment Creation Bridge Real-World User modules Third Party Collaboration LGSVL Simulator Test Scenario Scenario Player 3rd party Test Scenario 3rd party Scenario Player HD Map LGSVL Simulator and its APIs
50. 50 Build Software to Test Software exactpro.com https://www.lgsvlsimulator.com/docs/python-api/ LGSVL Simulator and its APIs
51. 51 Build Software to Test Software exactpro.com https://www.lgsvlsimulator.com/docs/python-api/ LGSVL Simulator and its APIs
52. 52 Build Software to Test Software exactpro.com https://github.com/lgsvl/PythonAPI LGSVL Simulator and its APIs
53. 53 Build Software to Test Software exactpro.com https://github.com/lgsvl/PythonAPI/blob/master/quickstart/01-connecting-to-simulator.py LGSVL Simulator and its APIs
54. 54 Build Software to Test Software exactpro.com Connection via port 8181
55. 55 Build Software to Test Software exactpro.com Simulator’s response
56. 56 Build Software to Test Software exactpro.com Request
57. 57 Build Software to Test Software exactpro.com Response
58. 58 Build Software to Test Software exactpro.com Callbacks Python API Simulator Simulation In running Python code waits for response Other actions Connect websocket Create vehicle Create pedestrian sim.run() Time limit or callback (ex collision) Create “Simulator”
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