UC-002 Open a delegated account — analysis realization

Overview	Requirements	Analysis	Design	Implementation	Tests
Use cases	Requirements	Analysis	Design	Implementation	Tests

Requirements: README

Participating classes

Class	Stereotype	Responsibility
My accounts page	boundary	Lists the accounts and starts the session.
Delegation manager	control	Decides access and starts login-as.
Session guard	control	Verifies the session on every request.
Session permissions	control	Applies the overrides to the session.
Delegation	entity	The record that allows the session.

Collaboration

Notes

The marker of a delegated session lives in $SESSION and not in a cache, because Moodle replaces $SESSION when login-as starts. The same checks run when the session starts and on every later request.