Trying upgrade from 0.7.1. to 0.8. Got "konan.work...
# kotlin-nativek
Konstantin Petrukhnov
08/09/2018, 10:43 AMTrying upgrade from 0.7.1. to 0.8. Got "konan.worker.InvalidMutabilityException: mutation attempt of frozen" (https://github.com/JetBrains/kotlin-native/issues/1775)
I have object GlobalServices , that have several lateinit fields, that initialized during app startup. What would be the right way to fix it? Kotlin code is used as library in Swift iOS project. Services that initialized inside kotlin, require some params, and depends on each other. Also having global object, allow to retrieve corresponding service directly from class.
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kpgalligan
08/09/2018, 2:09 PMNot exactly sure what you're asking, but will take a stab at it. "GlobalServices" is an object, which means in 0.8+ it'll be frozen by default. You can mark it @ThreadLocal, but you'll need to make sure you only access it from one thread (I assume main thread). Alternatively, rather than lateinit, use AtomicReference for the fields.
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olonho
08/09/2018, 3:06 PMKevin is correct, also
atomicLazyk
Konstantin Petrukhnov
08/10/2018, 7:00 AMAs I understood, suggested ways are kotlin-native speciffic. They will not work on jvm.
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olonho
08/10/2018, 7:26 AMyes
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Konstantin Petrukhnov
08/10/2018, 8:26 AMso, how i could do it for jvm and ios with the same code?
Konstantin Petrukhnov
08/10/2018, 8:31 AMWhat i want is to statically access objects (singletong services, with state), that were created in some init phase. These objects receive some initialisation data from outside of kotlin code.
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olonho
08/10/2018, 9:19 AMguess it depends on the usecase, generally speaking “common objects” are immutable, so you could either split common object in such a way, that platform-specific mutable (lateinit) objects are referred from the immutable object, and are implemented on Native using AtomicReference
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Konstantin Petrukhnov
08/10/2018, 10:52 AMOk, here some very similar example. My kotlin library need to have configuration, that is accessible in every part of my kotlin code. Configuration (e.g. as hashmap) is set from parent app (swift,jvm,etc).
What would be way to pass configuration to every other class, without passing it through the whole tree?
ClassA create ClassB, which create ClassC, which create ClassD. ClassD need to get some values from Configuration. A,B,C have nothing to do with configuration, and preferably should not be aware of it. I have 5 cases like configuration, and passing their references everywhere, or context with all of them, will look very ugly and hard to maintain.
Konstantin Petrukhnov
08/10/2018, 10:53 AMBut yes, if there no other easy way, I'm mentally ready to pass "context" object for every class constructor 🙂
Konstantin Petrukhnov
08/10/2018, 10:54 AMBut there should be better way, shouldn't it?
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olonho
08/10/2018, 11:27 AMDo you really need them to be mutable?
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Konstantin Petrukhnov
08/10/2018, 11:58 AMno
Konstantin Petrukhnov
08/10/2018, 12:00 PMbut they have mutable state inside them
Konstantin Petrukhnov
08/10/2018, 12:04 PMios app crashes on runtime, if that immutable class modify some internal variable (value cache in my case).
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olonho
08/10/2018, 12:58 PMit means, that you have a potential concurrency issue at this place, as this cache could be modified simultaniously
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Konstantin Petrukhnov
08/10/2018, 1:33 PMCan I do something, if i know that kotlin code will be always executed in same single thread?
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olonho
08/10/2018, 1:58 PMmark it with @ThreadLocal annotation (and if you want MPP, create stub annotation for JVM with the same name for now)
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Konstantin Petrukhnov
08/10/2018, 2:54 PMthx
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