From 34334396178eec3f72f1228b400cb9ec81c4ce4c Mon Sep 17 00:00:00 2001
From: Linnea Gräf <nea@nea.moe>
Date: Tue, 7 Jan 2025 14:07:14 +0100
Subject: build: Split up dependency injection into its own package

---
 src/main/kotlin/moe/nea/ledger/utils/di/DI.kt      | 78 ----------------------
 .../kotlin/moe/nea/ledger/utils/di/DIProvider.kt   | 52 ---------------
 src/main/kotlin/moe/nea/ledger/utils/di/Inject.kt  |  6 --
 3 files changed, 136 deletions(-)
 delete mode 100644 src/main/kotlin/moe/nea/ledger/utils/di/DI.kt
 delete mode 100644 src/main/kotlin/moe/nea/ledger/utils/di/DIProvider.kt
 delete mode 100644 src/main/kotlin/moe/nea/ledger/utils/di/Inject.kt

(limited to 'src/main/kotlin')

diff --git a/src/main/kotlin/moe/nea/ledger/utils/di/DI.kt b/src/main/kotlin/moe/nea/ledger/utils/di/DI.kt
deleted file mode 100644
index a9061d7..0000000
--- a/src/main/kotlin/moe/nea/ledger/utils/di/DI.kt
+++ /dev/null
@@ -1,78 +0,0 @@
-package moe.nea.ledger.utils.di
-
-import java.lang.reflect.AnnotatedElement
-import java.util.Collections
-import java.util.Stack
-
-@Suppress("UNCHECKED_CAST")
-class DI {
-	private fun formatInjectionStack() =
-		injectionStack.joinToString(" -> ")
-
-	fun <T : Any> getProvider(type: Class<T>): BaseDIProvider<T, *> {
-		val provider = providers[type] as BaseDIProvider<T, *>?
-			?: error("Could not find provider for type $type")
-		return provider
-	}
-
-	private fun <T : Any, C> internalProvide(type: Class<T>, element: AnnotatedElement? = null): T {
-		try {
-			val provider = getProvider(type) as BaseDIProvider<T, C>
-			val context = if (element == null) provider.createEmptyContext() else provider.createContext(element)
-			val key = Pair(type, context)
-			val existingValue = values[key]
-			if (existingValue != null) return existingValue as T
-			if (type in injectionStack) {
-				error("Found injection cycle: ${formatInjectionStack()} -> $type")
-			}
-			injectionStack.push(type)
-			val value =
-				provider.provideWithContext(this, context)
-			val cycleCheckCookie = injectionStack.pop()
-			require(cycleCheckCookie == type) { "Unbalanced stack cookie: $cycleCheckCookie != $type" }
-			values[key] = value
-			return value
-		} catch (ex: Exception) {
-			throw RuntimeException("Could not create instance for type $type (in stack ${formatInjectionStack()})", ex)
-		}
-	}
-
-	fun <T : Any> provide(type: Class<T>, element: AnnotatedElement? = null): T {
-		return internalProvide<T, Any>(type, element)
-	}
-
-	inline fun <reified T : Any> provide(): T = provide(T::class.java)
-
-	fun <T : Any> register(type: Class<T>, provider: BaseDIProvider<T, *>) {
-		providers[type] = provider
-	}
-
-	fun registerInjectableClasses(vararg type: Class<*>) {
-		type.forEach { internalRegisterInjectableClass(it) }
-	}
-
-	private fun <T : Any> internalRegisterInjectableClass(type: Class<T>) {
-		register(type, DIProvider.fromInjectableClass(type))
-	}
-
-	fun instantiateAll() {
-		providers.keys.forEach {
-			provide(it, null)
-		}
-	}
-
-	fun getAllInstances(): Collection<Any> =
-		Collections.unmodifiableCollection(values.values)
-
-	fun <T : Any> registerSingleton(value: T) {
-		register(value.javaClass, DIProvider.singeleton(value))
-	}
-
-	private val injectionStack: Stack<Class<*>> = Stack()
-	private val values = mutableMapOf<Pair<Class<*>, *>, Any>()
-	private val providers = mutableMapOf<Class<*>, BaseDIProvider<*, *>>()
-
-	init {
-		registerSingleton(this)
-	}
-}
\ No newline at end of file
diff --git a/src/main/kotlin/moe/nea/ledger/utils/di/DIProvider.kt b/src/main/kotlin/moe/nea/ledger/utils/di/DIProvider.kt
deleted file mode 100644
index bd5b9ef..0000000
--- a/src/main/kotlin/moe/nea/ledger/utils/di/DIProvider.kt
+++ /dev/null
@@ -1,52 +0,0 @@
-package moe.nea.ledger.utils.di
-
-import java.lang.reflect.AnnotatedElement
-import java.lang.reflect.Constructor
-
-fun interface DIProvider<T : Any> : BaseDIProvider<T, Unit> {
-	override fun provideWithContext(di: DI, context: Unit): T {
-		return provide(di)
-	}
-
-	override fun createContext(element: AnnotatedElement) {
-	}
-
-	override fun createEmptyContext() {
-	}
-
-	fun provide(di: DI): T
-
-	companion object {
-
-		fun <T : Any> fromInjectableClass(clazz: Class<T>): DIProvider<T> {
-			@Suppress("UNCHECKED_CAST")
-			val cons = (clazz.constructors.find { it.getAnnotation(Inject::class.java) != null }
-				?: clazz.constructors.find { it.parameterCount == 0 }
-				?: error("Could not find DI injection entrypoint for class $clazz"))
-					as Constructor<out T>
-			// TODO: consider using unsafe init to inject the parameters *before* calling the constructor
-			return DIProvider { di ->
-				val typArgs = cons.parameters.map {
-					di.provide(it.type, it)
-				}.toTypedArray()
-				val instance = cons.newInstance(*typArgs)
-				for (it in clazz.fields) {
-					if (it.getAnnotation(Inject::class.java) == null) continue
-					it.set(instance, di.provide(it.type, it))
-				}
-				instance
-			}
-		}
-
-		fun <T : Any> singeleton(value: T): DIProvider<T> {
-			return DIProvider { _ -> value }
-		}
-	}
-
-}
-
-interface BaseDIProvider<T : Any, C> {
-	fun createContext(element: AnnotatedElement): C
-	fun provideWithContext(di: DI, context: C): T
-	fun createEmptyContext(): C
-}
diff --git a/src/main/kotlin/moe/nea/ledger/utils/di/Inject.kt b/src/main/kotlin/moe/nea/ledger/utils/di/Inject.kt
deleted file mode 100644
index a8fdd87..0000000
--- a/src/main/kotlin/moe/nea/ledger/utils/di/Inject.kt
+++ /dev/null
@@ -1,6 +0,0 @@
-package moe.nea.ledger.utils.di
-
-@Retention(AnnotationRetention.RUNTIME)
-@Target(AnnotationTarget.CONSTRUCTOR, AnnotationTarget.FIELD)
-annotation class Inject(
-)
-- 
cgit