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Kotlin Embedded Config
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open class DeploymentEnvironment<T : Any>( | |
val base: T, | |
vararg val profiles: Pair<String, (T) -> T> | |
) { | |
companion object { | |
fun <T : Any> config(clazz: Class<T>, name: String, profiles: Iterable<String> = emptyList()): T { | |
return (Class.forName(clazz.`package`.name + "." + name).kotlin.objectInstance as DeploymentEnvironment<T>) | |
.config(profiles) | |
} | |
} | |
fun config(profiles: Iterable<String> = emptyList()): T = | |
profiles.fold(base) { config, profile -> | |
this.profiles.first { it.first == profile }.second(config) | |
} | |
} |
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data class FooConfig( | |
val name: String, | |
val value: Int | |
) | |
object dev : DeploymentEnvironment<FooConfig>( | |
FooConfig("dev", 1), | |
"p2" to { config: FooConfig -> config.copy(value = 2) }, | |
"p3" to { config: FooConfig -> config.copy(value = 3) } | |
) | |
class DeploymentEnvironmentTest { | |
@Test | |
fun config() { | |
assertEquals( | |
dev.base, | |
DeploymentEnvironment.get(FooConfig::class.java, "dev") | |
) | |
} | |
@Test | |
fun profileOverrideConfig() { | |
assertEquals( | |
dev.base.let(dev.profiles[0].second), | |
DeploymentEnvironment.get(FooConfig::class.java, "dev", listOf("p2")) | |
) | |
} | |
@Test | |
fun laterProfileOverridePrior() { | |
assertEquals( | |
dev.base.let(dev.profiles[0].second).let(dev.profiles[1].second), | |
DeploymentEnvironment.get(FooConfig::class.java, "dev", listOf("p2", "p3")) | |
) | |
} | |
} |
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