The SIS (Student Information System) state changes from Idle to Servicing Teacher when the Teacher logged into SIS by entering userid/password. On entering the Servicing Teacher state, the entry action read userid/password is performed. Note, that transition from Servicing Teacher state back to the Idle state could be triggered by logout event as the Teacher could logout Attendance at any time. Serving Teacher state is a composite state with sequential sub states Teacher Authentication, Selecting Attendance and Attendance. Teacher Authentication and Attendance are composite states by themselves which is shown with hidden decomposition indicator icon. Serving Teacher state has trigger less transition back to the Idle state after Attendance is finished. The state also has exit action logout which releases teacher's session on leaving the state, no matter what caused the transition out of the state.

The SIS (Student Information System) state changes from Idle to Servicing Teacher when the Teacher logged into SIS by entering userid/password. On entering the Servicing Teacher state, the entry action read userid/password is performed. Note, that transition from Servicing Teacher state back to the Idle state could be triggered by logout event as the Teacher could logout Attendance at any time. Serving Teacher state is a composite state with sequential sub states Teacher Authentication, Selecting Attendance and Attendance. Teacher Authentication and Attendance are composite states by themselves which is shown with hidden decomposition indicator icon. Serving Teacher state has trigger less transition back to the Idle state after Attendance is finished. The state also has exit action logout which releases teacher's session on leaving the state, no matter what caused the transition out of the state.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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