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Sequence Diagram - Group Diary Meeting Arrangement

publish date: 1969/12/31 00:00:00 UTC

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In a sequence diagram for a group diary system where a group of people are arranging a meeting, what is the correct sequence of operations between key objects?

Diary objects automatically negotiate with each other to find a common slot without any user initiation

MeetingOrganizer sends findSlot() to each participant's Diary; each Diary returns available slots; MeetingOrganizer identifies a common slot; MeetingOrganizer sends createAppointment() to each participant's Diary; each Diary adds the appointment and sends a Notification to the participant

The system creates the appointment first, then checks if participants are available afterward

User → System: finds a slot, then simultaneously updates all diaries without checking availability

Correct Answer

Explanation

The correct sequence for group meeting arrangement: a MeetingOrganizer object (or the initiating User) sends findSlot() to each participant's Diary object; each Diary returns its available time slots; the MeetingOrganizer identifies a common slot across all diaries; it then sends createAppointment() to each Diary with the agreed time; each Diary records the appointment and triggers a Notification to its owner. If no common slot is available, the system interacts with the user to rearrange their personal diary.

Reference

Software Engineering, Ian Sommerville, 10th edition

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Design and Implementation: Exercises