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Single Injection Container in pure Kotlin
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typealias ServiceBuilderBlock<T> = () -> T | |
class ServiceBuilderkWrapper<T>(val serviceBuilderBlock:ServiceBuilderBlock<T>, val serviceName: String) | |
object InjectionContainer { | |
var serviceBuilderkWrappers = mutableListOf<ServiceBuilderkWrapper<Any>>() | |
inline fun <reified T>registerService(noinline block: ServiceBuilderBlock<T>) { | |
val wrapper = ServiceBuilderkWrapper(block, T::class.simpleName ?: "noname") as ServiceBuilderkWrapper<Any> | |
serviceBuilderkWrappers.add(wrapper) | |
} | |
inline fun <reified T> getService(): T { | |
val serviceWrapper = serviceBuilderkWrappers.first { it.serviceName == T::class.simpleName } | |
val block = serviceWrapper.serviceBuilderBlock as ServiceBuilderBlock<T> | |
val instance = block() | |
return instance | |
} | |
} |
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// Your service interface | |
interface PhotoService { | |
fun fetchPhoto(): String | |
} | |
class App { | |
fun run() { | |
// Register your service. | |
InjectionContainer.registerService<PhotoService> { | |
MyPhotoService() | |
} | |
} | |
} | |
class Fragment { | |
fun usage() { | |
val photoService: PhotoService = InjectionContainer.getService() | |
photoService.fetchPhoto() | |
} | |
} | |
// Your injected service | |
class MyPhotoService: PhotoService { | |
override fun fetchPhoto(): String { | |
return "Yay! Photo" | |
} | |
} |
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