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Dominik Liebler 2014-04-08 20:15:28 +02:00
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DependencyInjection/README.md
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@ -6,11 +6,11 @@ To implement a loosely coupled architecture in order to get better testable, mai
## Usage ## Usage
Configuration gets injected and `Connection` will get all that it needs from Configuration Without DI, the configuration would be created directly in Connection, which is not very good for testing and extending `Connection`. Configuration gets injected and `Connection` will get all that it needs from `$config`. Without DI, the configuration would be created directly in `Connection`, which is not very good for testing and extending `Connection`.
Notice we are following Inversion of control principle in `Connection` by asking `$config` to implement `Parameters` interface. This decouples our components. We don't care where the source of information comes from, we only care that config has certain methods to retrieve that information. Read more about Inversion of control [here](http://en.wikipedia.org/wiki/Inversion_of_control). Notice we are following Inversion of control principle in `Connection` by asking `$config` to implement `Parameters` interface. This decouples our components. We don't care where the source of information comes from, we only care that `$config` has certain methods to retrieve that information. Read more about Inversion of control [here](http://en.wikipedia.org/wiki/Inversion_of_control).
## Examples ## Examples
* the Doctrine2 ORM uses dependency injection e.g. for Configuration that is injected into a Connection object. for testing purposes, one can easily create a mock object of the configuration and inject that into the connection object * The Doctrine2 ORM uses dependency injection e.g. for configuration that is injected into a `Connection` object. For testing purposes, one can easily create a mock object of the configuration and inject that into the `Connection` object
* Symfony and Zend Framework 2 already have containers for DI that create objects via a configuration array and inject them where needed (i.e. in Controllers) * Symfony and Zend Framework 2 already have containers for DI that create objects via a configuration array and inject them where needed (i.e. in Controllers)