Detailed
Design Document Department of Computer
Science Page maintainer: Terrence
Asgar-Deen |
Logging onto the system is described in the above diagram. The user passes his/her username and password to the system. From the user data store, the instance of the user corresponding to the username is retrieved. If the system finds a valid password for the username that matches the inputted password, the user is granted access to the system. The user's security level is retrieve from the user datastore and is propagated through the system specifying the access of functionality for the user.
The returned status corresponds to the success of the operation.
| Process ID | 1.E |
|---|---|
| Process Name | Logging onto the System |
| Inputs | username, password |
| Outputs | None |
| Permissible User | Administrator, Salesperson |
| Assumptions | All information entered is syntactically correct. |
| Error Conditions | The username entered does not exist. The password entered is not correct. |
| Name | password |
|---|---|
| Kind | Data movement in DFD |
| Type | String |
| Description | This data element corresponds to the user's password. |
| Name | status |
|---|---|
| Kind | Data movement in DFD |
| Type | Return Message |
| Description | This data element corresponds to an error message being returned from an operation. An error message may be both successful and unsuccessful. Unsuccessful error messages are further subcategorized into different errors based on the possible errors that can occur in an operation. |
| Name | user |
|---|---|
| Kind | Data movement in DFD |
| Type | Instance of an Entity |
| Description | This data element corresponds to a complete instance of the Entity User. |
| Name | username |
|---|---|
| Kind | Data movement in DFD |
| Type | String |
| Description | This data element corresponds to the user's username. |
All users must first be validated through the Login dialog before entering the system. The user enters his or her user name in the first field, and his or her password in the second field. All characters typed in the second field will be hidden and replaced with asterisks (*). When the user presses Enter, or clicks OK then system checks the name and password as described below with the DFD. If the user name and password are not correct, a dialog will be displayed notifying the user the user name and password were rejected. For security reasons, the system will not tell the user the specific reason that the login was rejected. Once a user successfully enters a user name and password, the user will gain access. The system will determine if the user is a salesperson, or an administrator and set access to various functions accordingly. Clicking the Close button will display a dialog asking the user if they want to exit the Sales Routing System without logging on.