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Denise 2019-10-02 08:53:57 +01:00 committed by Ilkka Seppälä
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abstract-factory/README.md
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@ -169,15 +169,20 @@ Use the Abstract Factory pattern when
* you need a run-time value to construct a particular dependency * you need a run-time value to construct a particular dependency
* you want to decide which product to call from a family at runtime. * you want to decide which product to call from a family at runtime.
* you need to supply one or more parameters only known at run-time before you can resolve a dependency. * you need to supply one or more parameters only known at run-time before you can resolve a dependency.
* when you need consistency among products
* you don’t want to change existing code when adding new products or families of products to the program.
## Use Cases: ## Use Cases:
* Selecting to call the appropriate implementation of FileSystemAcmeService or DatabaseAcmeService or NetworkAcmeService at runtime. * Selecting to call the appropriate implementation of FileSystemAcmeService or DatabaseAcmeService or NetworkAcmeService at runtime.
* Unit test case writing becomes much easier * Unit test case writing becomes much easier
* UI tools for different OS
## Consequences: ## Consequences:
* Dependency injection in java hides the service class dependencies that can lead to runtime errors that would have been caught at compile time. * Dependency injection in java hides the service class dependencies that can lead to runtime errors that would have been caught at compile time.
* While the pattern is great when creating predefined objects, adding the new ones might be challenging.
* The code may become more complicated than it should be, since a lot of new interfaces and classes are introduced along with the pattern.
## Tutorial ## Tutorial