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OutSystems community meetup 2019 03_how to handle exceptions like a pro
- 1. Enjoying challenges, providing solutions.
- 2. How to Handle Exceptions like a Pro
- 3. Topics • What is an Exception? • How does Outsystems categorize Exceptions? • How does Outsystems handle Exceptions? • Exception Encapsulation: Tips and Tricks • Special Cases • Timers • BPT • REST
- 4. What is an Exception? An exception is an abnormal or unprecedented event that occurs after the execution of a software program or application. It is a runtime error of an undesired result or event affecting normal program flow. An exception is also known as a fault. A person or thing that is excluded from a general statement or does not follow a rule.
- 5. What is an Exception?
- 6. What is an Exception?
- 7. Outsystems Exceptions Tools • Raise Exception • Exception Message • Exception (Type)
- 8. Outsystems Exceptions Tools • Exception Handler • Abort Transaction • Log Error
- 9. Outsystems Exceptions Categorization • Database Exception • Security Exception • Communication Exception • Abort Activity Exception • User Exceptions
- 10. Outsystems Exception Handling Exception Handler for MyUserException? Exception Handler for CategorizedExceptions? Exception Handler for AllExceptions?
- 11. Outsystems Exception Handling Exception Handler for UI Flow? Exception Handler for the Module/eSpace? Application abort
- 12. Exception Encapsulation: Tips and Tricks Integration Layer • Catch the exception • Log it • Define an output with a success and a message • Do not abort the transaction! • Optional: Expose a ‘user friendly’ message in case of unknown error
- 13. Exception Encapsulation: Tips and Tricks Core Services Layer • Which is the context? • Sub-action of a bigger flow? • Encapsulate • Normal action to be used on the users layer? • Do not encapsulate • ‘User Friendly’ messages are a must (don’t forget the translations)
- 14. Exception Encapsulation: Tips and Tricks Users Layer • Do not encapsulate
- 15. Special Cases Timers • The timeout issue • Timeout Variable • Timer scheduling properties • Retry mechanism • Service Center – Environment Configuration
- 16. Special Cases BPT • The timeout issue • 5 min • Theoretically, it can retry ‘forever’
- 17. Special Cases REST • All above a 400 is logged and thrown as an exception • Sometimes it is an expected behaviour • OnResponse Event allows to catch the response and manipulated as needed
- 18. Useful Links • https://success.outsystems.com/Documentation/11/Developing_an_Application/Implement_ Application_Logic/Handle_Exceptions • https://success.outsystems.com/Documentation/11/Developing_an_Application/Implement_ Application_Logic/Handle_Exceptions/Exception_Handling_Mechanism • https://success.outsystems.com/Documentation/11/Extensibility_and_Integration/REST/Con sume_REST_APIs/Handling_REST_Errors • https://success.outsystems.com/Documentation/11/Reference/OutSystems_Language/Proce sses/Process_Tools/Automatic_Activity
- 19. Thank you!
- 20. Amsterdam Evert van Beekstraat 1-76 1118 CL Schiphol Nederland +31 (0)76 711 54 00 info@iadvise.eu Breda Neerloopweg 364814 RS Breda Nederland +31 (0)76 711 54 00 info@iadvise.eu Antwerpen Veldkant 33b 2550 Kontich België +32 (0)3 451 93 28 info@iadvise.eu