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| # Patterns | ||
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| [Dependency Injection](Patterns%20c9fbf0af8e1648ee80d4ddedd63983f1/Dependency%20Injection%207193bc478cee4995b7538edcfbcc189e.md) |
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| # Dependency Injection | ||
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| # Types | ||
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| There are three types of Dependency Injection: | ||
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| - Type 1 IoC (Constructor Injection) | ||
| - Type 2 IoC (Setter Injection) | ||
| - Type 3 IoC (Interface Injection) | ||
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| ## Constructor Injection | ||
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| [As Martin Fowler describes constructor injection](https://martinfowler.com/articles/injection.html), there is mostly a sort of assembler or container system involved where you can register implementations used for specific interfaces and where dependencies and dependents are defined. | ||
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| Then, the actual dependency is passed into a constructor of a class using an interface defining the dependencies behavior. | ||
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| ](Dependency%20Injection%207193bc478cee4995b7538edcfbcc189e/Untitled.png) | ||
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| [Source: Martin Fowler](https://martinfowler.com/articles/injection/injector.gif) | ||
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| ``` | ||
| class MovieLister... | ||
| public MovieLister(MovieFinder finder) { | ||
| this.finder = finder; | ||
| } | ||
| class ColonMovieFinder... | ||
| public ColonMovieFinder(String filename) { | ||
| this.filename = filename; | ||
| } | ||
| private MutablePicoContainer configureContainer() { | ||
| MutablePicoContainer pico = new DefaultPicoContainer(); | ||
| Parameter[] finderParams = {new ConstantParameter("movies1.txt")}; | ||
| pico.registerComponentImplementation(MovieFinder.class, ColonMovieFinder.class, finderParams); | ||
| pico.registerComponentImplementation(MovieLister.class); | ||
| return pico; | ||
| } | ||
| ``` | ||
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| ## Setter Injection | ||
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| ```go | ||
| type MovieFinder struct { | ||
| lister MovieLister | ||
| } | ||
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| func (t *MovieFinder) SetLister(lister MovieLister) { | ||
| t.lister = lister | ||
| } | ||
| ``` | ||
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| ## Interface Injection | ||
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| Almost the same as setter injection, but the injector method is specified by an interface. | ||
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| ```go | ||
| public interface ServiceSetter { | ||
| void setService(Service service); | ||
| } | ||
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| public class Client implements ServiceSetter { | ||
| private Service service; | ||
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| @Override | ||
| public void setService(Service service) { | ||
| if (service == null) { | ||
| throw new IllegalArgumentException("service must not be null"); | ||
| } | ||
| this.service = service; | ||
| } | ||
| } | ||
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| public class ServiceInjector { | ||
| private final Set<ServiceSetter> clients = new HashSet<>(); | ||
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| public void inject(ServiceSetter client) { | ||
| this.clients.add(client); | ||
| client.setService(new ExampleService()); | ||
| } | ||
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| public void switch() { | ||
| for (Client client : this.clients) { | ||
| client.setService(new AnotherExampleService()); | ||
| } | ||
| } | ||
| } | ||
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| public class ExampleService implements Service {} | ||
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| public class AnotherExampleService implements Service {} | ||
| ``` | ||
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| # Resources | ||
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| ## Articles | ||
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| - [https://martinfowler.com/articles/injection.html](https://martinfowler.com/articles/injection.html) | ||
| - [https://en.wikipedia.org/wiki/Dependency_injection](https://en.wikipedia.org/wiki/Dependency_injection) | ||
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| ## Videos | ||
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| - [https://youtu.be/J1f5b4vcxCQ](https://youtu.be/J1f5b4vcxCQ) | ||
| - [https://youtu.be/yunF2PgJlHU](https://youtu.be/yunF2PgJlHU) |
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