What is a trigger in a use case?

What is a trigger in a use case?

A trigger is the initiator of a use case. It is what causes the use case to start. There isn’t a promise that this event happens – only an indication that this event triggers the start of a use case.

What is external and temporal?

 external event – an event that occurs outside the system, usually initiated by an external agent.  actor – an external agent; a person or group that interacts with the system by supplying or. receiving data.  temporal event – an event that occurs as a result of reaching a point in time.

Can a use case have more than one trigger?

Is it possible for use case to have different action depending on which Actor triggers it? Technically yes, but it smells bad. Consider to split the common part into separate scenario (this probably would require creation of a new common role as well).

What is trigger in system analysis?

Trigger — event that causes the use. case to be executed. Event-driven modeling – everything in. the system is a response to some. triggering event.

What is the distinction between an external trigger and a temporal trigger give two examples of each?

A temporal trigger is based upon the passage of time. Examples are time to pay a bill; library book is due. External triggers are things outside the system to which the system must respond. Examples are a customer placing an order; customer payment is received.

What is basic flow in use case?

The Basic Flow of Events specifies the interactions between the actor(s) and the system for the ideal case, where everything goes as planned, and the actor’s goal (the observable result of value) is met. The basic flow represents the main capability provided by the system for this use case.

What is a temporal trigger in use case?

What are two approaches used to identify use cases?

Use cases are thus, a combination of existing system functions and newly requested functions. Another technique used for identifying use cases is CRUD, an acronym for Create, Read or Report, Update and Delete….

• Update Vacancies.
• Count Applications.
• Filter Applications.
• Forward Applications.
• Produce Summary Report.

What is the difference between include and extend relationship in use case?

“The include relationship is intended for reusing behaviour modeled by another use case, whereas the extend relationship is intended for adding parts to existing use cases as well as for modeling optional system services” (Overgaard and Palmkvist, Use Cases: Patterns and Blueprints.

Which use case relationship is used to model the relationship between a use case and an actor?

An association is the relationship between an actor and a business use case. It indicates that an actor can use a certain functionality of the business system—the business use case: Unfortunately, the association does not give any information about the way in which the functionality is used.

What are trigger concepts?

A trigger is a special type of stored procedure that automatically runs when an event occurs in the database server. DML triggers run when a user tries to modify data through a data manipulation language (DML) event. DML events are INSERT, UPDATE, or DELETE statements on a table or view.

What is the difference between an external trigger and a temporal trigger?