Kodein Ktor=冷冻kotlin的突变尝试。收藏。HashMap-为什么？

提问者：小点点

Kodein Ktor=冷冻kotlin的突变尝试。收藏。HashMap-为什么？

最近几天，我一直在为这个例外而挣扎。

我有一个kotlin多平台项目，具有以下依赖项：

科特林=1.5。10
科丹=7.6。0
ktor=1.6。0（内部使用kotlin协程1.5.0-native-mt）

我一直被提到的例外，而试图使用http客户端在本机：

    at kotlin.Throwable#<init>(/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/Throwable.kt:23)
    at kotlin.Exception#<init>(/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/Exceptions.kt:23)
    at kotlin.RuntimeException#<init>(/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/Exceptions.kt:34)
    at kotlin.native.concurrent.InvalidMutabilityException#<init>(/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/native/concurrent/Freezing.kt:22)
    at <global>.ThrowInvalidMutabilityException(/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/native/concurrent/Internal.kt:93)
    at <global>.MutationCheck(Unknown Source)
    at kotlin.collections.HashMap.<set-length>#internal(/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/collections/HashMap.kt:16)
    at kotlin.collections.HashMap#addKey(/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/collections/HashMap.kt:292)
    at kotlin.collections.HashMap#put(/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/collections/HashMap.kt:68)
    at org.kodein.di.internal.DITreeImpl#find(/Users/runner/work/Kodein-DI/Kodein-DI/kodein-di/src/commonMain/kotlin/org/kodein/di/internal/DITreeImpl.kt:132)
    at org.kodein.di.DITree#find$default(/Users/runner/work/Kodein-DI/Kodein-DI/kodein-di/src/commonMain/kotlin/org/kodein/di/DITree.kt:36)
    at org.kodein.di.internal.DIContainerImpl#factory(/Users/runner/work/Kodein-DI/Kodein-DI/kodein-di/src/commonMain/kotlin/org/kodein/di/internal/DIContainerImpl.kt:158)
    at org.kodein.di.DIContainer#factory$default(/Users/runner/work/Kodein-DI/Kodein-DI/kodein-di/src/commonMain/kotlin/org/kodein/di/DIContainer.kt:32)
    at org.kodein.di.DIContainer#provider(/Users/runner/work/Kodein-DI/Kodein-DI/kodein-di/src/commonMain/kotlin/org/kodein/di/DIContainer.kt:76)
    at org.kodein.di.DIContainer#provider$default(/Users/runner/work/Kodein-DI/Kodein-DI/kodein-di/src/commonMain/kotlin/org/kodein/di/DIContainer.kt:75)
    at org.kodein.di.internal.DirectDIBaseImpl#Instance(/Users/runner/work/Kodein-DI/Kodein-DI/kodein-di/src/commonMain/kotlin/org/kodein/di/internal/DirectDIImpl.kt:30)
    at InvalidMutabilitySampleTest.<init>$lambda-6$lambda-5$lambda-4$lambda-3$lambda-2#internal(/Users/r.juszczyk/StudioProjects/lmhu-multiplatform-app/MultiplatformApp/src/iosTest/kotlin/InvalidMutabilitySampleTest.kt:26)
    at InvalidMutabilitySampleTest.$<init>$lambda-6$lambda-5$lambda-4$lambda-3$lambda-2$FUNCTION_REFERENCE$3.invoke#internal(/Users/r.juszczyk/StudioProjects/lmhu-multiplatform-app/MultiplatformApp/src/iosTest/kotlin/InvalidMutabilitySampleTest.kt:25)
    at InvalidMutabilitySampleTest.$<init>$lambda-6$lambda-5$lambda-4$lambda-3$lambda-2$FUNCTION_REFERENCE$3.$<bridge-UNNN>invoke(/Users/r.juszczyk/StudioProjects/lmhu-multiplatform-app/MultiplatformApp/src/iosTest/kotlin/InvalidMutabilitySampleTest.kt:25)
    at io.ktor.client.HttpClientConfig.install$<anonymous>_1#internal(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClientConfig.kt:69)
    at io.ktor.client.HttpClientConfig.$install$<anonymous>_1$FUNCTION_REFERENCE$17.invoke#internal(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClientConfig.kt:65)
    at io.ktor.client.HttpClientConfig.$install$<anonymous>_1$FUNCTION_REFERENCE$17.$<bridge-UNNN>invoke(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClientConfig.kt:65)
    at io.ktor.client.features.json.JsonFeature.Feature#prepare(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-features/ktor-client-json/common/src/io/ktor/client/features/json/JsonFeature.kt:129)
    at io.ktor.client.HttpClientConfig.install$<anonymous>_1-2#internal(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClientConfig.kt:77)
    at io.ktor.client.HttpClientConfig.$install$<anonymous>_1-2$FUNCTION_REFERENCE$18.invoke#internal(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClientConfig.kt:74)
    at io.ktor.client.HttpClientConfig.$install$<anonymous>_1-2$FUNCTION_REFERENCE$18.$<bridge-UNNN>invoke(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClientConfig.kt:74)
    at io.ktor.client.HttpClientConfig#install(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClientConfig.kt:97)
    at io.ktor.client.HttpClient#<init>(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClient.kt:172)
    at io.ktor.client.HttpClient#<init>(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClient.kt:81)
    at io.ktor.client#HttpClient(/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClient.kt:43)

我设法在一次测试中再现了那次崩溃：

class InvalidMutabilitySampleTest {
    val di = DI {
        import(DI.Module("Some Module") {
            bind<Json>() with provider {
                Json {
                    prettyPrint = true
                    isLenient = true
                }
            }

            bind<HttpClient>() with provider {
                HttpClient{
                    install(JsonFeature) {
                        serializer = KotlinxSerializer(instance())
                    }
                }
            }
        })
    }

    val httpClient: HttpClient by di.instance()

    @Test
    fun invalidMutabilityTest() {
        println(httpClient)
    }

}

我也设法通过改变来修复它：

HttpClient{
   install(JsonFeature) {
      serializer = KotlinxSerializer(instance())
   }
}

致：

val json = instance<Json>()
HttpClient{
   install(JsonFeature) {
      serializer = KotlinxSerializer(json)
   }
}

然后我注意到HttpClient做了一件非常特殊的事情——它在init块中冻结自己。我用以下示例代码复制了它：

class FrozenConstructor(val block: ()->Unit) {
    init {
        freeze()
    }
}

class InvalidMutabilitySampleTest2 {
    val di = DI {
        import(DI.Module("Some Module") {
            bind<String>() with provider {
                "lolo"
            }

            bind<FrozenConstructor>() with provider {
                FrozenConstructor{
                    instance<String>()
                }
            }
        })
    }

    val frozenConstructor: FrozenConstructor by di.instance()

    @Test
    fun invalidMutabilityTest() {
        println(frozenConstructor)
    }
}

因此，我的理论如下：

kodein试图提供FrozenConstructorclass
FrozenConstructor被创建并冻结自身及其引用kodein的成员
kodein尝试缓存提供的依赖项，并尝试变异内部MutableMap，该映射被冻结，所有内容都崩溃

有人能证实这或多或少是正确的，如果不是，请纠正我吗？

你们能不能建议最好的处理方法，以及其他等待的陷阱？

这是一只kodein虫吗？

为什么kodein必须存储的东西在一个可变的地图，如果我使用与提供者而不是与单例？

共2个答案

匿名用户

我想你已经差不多明白了。Ktor冻结自身及其所有配置，以确保它可以在静态编程语言/本机中跨线程使用。Kodein假设你只会从一个线程触摸它，并且冻结是不安全的。这是一个限制，一个错误，还是一个设计缺陷，可能需要解释。）

为了解决这些问题，您希望避免在HttpClient配置中意外捕获引用Kodein内部的this引用。这样做的一个好方法是从HttpClientlambda之外的helper变量中获取DI实例，正如您所发现的那样。

匿名用户

你说得对FrozenConstructor冻结自身，因此其block属性（作为lambda）冻结其所有捕获，包括DI容器。

Kodein-DI不支持冻结（因此本机多线程）。自从JB宣布开发新的GC以来，已经决定不投资于使其与本地多线程兼容。