Hook: Change Shop Quit Behavior

Requirement

The application's response to the " Quit " menu button or any OS dependent gesture for closing the application must be altered. For example, saving the application's state on shutdown is not necessary nor wanted.

Method of Adaptation

Replace Feature

Level of Support

Parameter Pattern

HotSpot

Shutdown

Hooks used

Incorporate new Shop

Participants

Shop, NewShop

Changes

1. subclass NewShop of Shop.
2. NewShop.quit overrides Shop.quit :
1. synchronisation ( Shop.shutdown , System.exit (0) ).
2. System.exit must only be called, if Shop.shutdown returns true.
3. Incorporate new Shop [NewShop = NewShop].

Comments

• The code for a quit method that closes the Shop without saving the application's state would be:

  
    if (shutdown (false))
      System.exit (0);