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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:

1. A sample game called TerrysGame.

2. A class called HighScore, which is used by TerrysGame to store a user's latest high score.

3. A class called HighScorePermission, which is used to protect access to the user's stored high score value.

4. A user's security policy file, which grants permission to TerrysGame to update his/her high score.

The basic scenario is as follows:

1. A user plays TerrysGame.

2. If the user reaches a new high score, TerrysGame uses the HighScore class to save this new value.

3. The HighScore class looks into the user's security policy to check if TerrysGame has permission to update the user's high score value.

4. If TerrysGame 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:

• TerrysGame

• The HighScore Class

• The HighScorePermission Class

• A Sample Policy File

• Putting It All Together

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