Blockchain Development with Hyperledger

Event definitions

Look at the next definition in the model file:

event InitialApplicationEvent {   --> LetterOfCredit loc}

It's an event! You'll often see this–an event definition immediately next to a transaction of the same name. That's because this is really an external event–it's simply capturing the applicant applying for a letter of credit. It simply points to the letter that generated the event. In the application, it's simply used to keep the UI up-to-date, but in general, all kinds of processing could be triggered by this initial application.

Continue to look through the model file, and you'll see transactions and events defined for every step of the process, and sometimes extra attributes relevant to that transaction step. Spend a ...