Lesson: Implementing Your Own Permission
This lesson demonstrates how to write a class that defines its own special permission. The basic components in this lesson include:
- A sample game called ExampleGame.
- A class called HighScore, which is used by
ExampleGame
to store a user's latest high score. - A class called HighScorePermission, which is used to protect access to the user's stored high score value.
- A user's security policy file, which grants permission to
ExampleGame
to update his/her high score.
The basic scenario is as follows:
- A user plays
ExampleGame
. - If the user reaches a new high score,
ExampleGame
uses theHighScore
class to save this new value. - The
HighScore
class looks into the user's security policy to check ifExampleGame
has permission to update the user's high score value. - If
ExampleGame
has permission to update the high score, then the HighScore class updates that value.
We describe the key points of each of the basic components and then show a sample run: