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Object Tracking And Bulk Replacement.md

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Overview:

Object tracking can be done by using a factory to construct the object, create a weak reference to the object, and store the weak reference in a list within the factory. This is good if we want to have a way to track objects in memory or in a cache without interfering with garbage collection.

Additionally we can bulk replace objects we are tracking by providing a reference to a wrapper class which contains the object, instead of just a reference to the object itself. This second layer of indirection allows us to find the wrapper object in memory, and replace the contained object without affecting the reference.

Types participating in this pattern include:

  • ITheme

    • Interface used for both DarkTheme and LightTheme, giving us the ability to store references to both themes within a single list.

  • DarkTheme

    • Class containing the Dark Theme Properties

  • LightTheme

    • Class containing the Light Theme Properties

  • Ref

    • A wrapper class used for reference, which will contain a theme.

  • ReplaceableThemeFactory

    • This factory is used to construct a theme object, place it within a wrapper class, create a reference to the wrapper class, and store the reference in a list. Additionally, it provides functionality used to find the wrapper by reference, and replace the theme object contained within it.

  • TrackingThemeFactory

    • This factory is used to construct a theme object, create a reference directly to the theme object, and store the reference in a list. It provides additional functionality which outputs information to the console about what type of theme each object is, that is being tracked.

Sources:

Design Patterns in C# and .NET - Factory: Object Tracking and Bulk Replacement

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