Dynamics NAV - Events, Publishers and Subscribers

https://docs.microsoft.com/en-us/dynamics-nav/walkthrough--publishing--raising--and-subcribing-to-an-event-in-microsoft-dynamics-nav

• Two types of Events exist
• NAV CAL Events 
• Eg. OnValidate
• SQL Trigger Events 
• Eg. OnAfterModifyEvent
• Publisher
• A custom function with a single parameter
• C50000 = Publisher
• Global Function = AfterValidate
• Parameter = Name
• Properties as follows
• Event: Publisher
• Eventtype: Integration
• If we wanted to Publish P21 Customer.Name OnValidate()
• In Customer Object, Name OnValidate() CAL
• Create global = Publisher,Codeunit 50000,Publisher
• Add line Publisher.AfterValidate(Name)
• Now, whenever Customer.Name OnValidate() occurs, Publisher.AfterValidate will "Publish"
• Subscriber
• A custom function C50001:Custom,function CusNameChanged containing custom CAL with Properties as follows
• Event = Subscriber
• EventPublisherObject = P21 Customer Card
• Eventfunction = AfterValidate
• Do not change the default Parameters that get created after selecting the eventfunction or your trigger will not work
• Enter any custom CAL on this function
• Now, the Event is linked to the publisher, which is linked to the subscriber
• Whenever the Event happens, the Publisher triggers, and the Subscriber executes
• Event: Customer.Name OnValidate() executes
• Publisher: Publisher.AfterValidate(Name) executes and sends trigger
• Subscriber: Custom.CusNameChanged() executes