logo
Tags down

shadow

Singleton in Kotlin


By : M.Bowman
Date : September 18 2020, 04:00 AM
it should still fix some issue if you use an object instead of a class you may have better luck
ie.
code :
object MySingleton {
    val thingA = 0
}


Share : facebook icon twitter icon

Singleton with parameter in Kotlin


By : Seenu
Date : March 29 2020, 07:55 AM
it should still fix some issue Here's a neat alternative from Google's architecture components sample code, which uses the also function:
code :
class UsersDatabase : RoomDatabase() {

    companion object {

        @Volatile private var INSTANCE: UsersDatabase? = null

        fun getInstance(context: Context): UsersDatabase =
            INSTANCE ?: synchronized(this) {
                INSTANCE ?: buildDatabase(context).also { INSTANCE = it }
            }

        private fun buildDatabase(context: Context) =
            Room.databaseBuilder(context.applicationContext,
                    UsersDatabase::class.java, "Sample.db")
                    .build()
    }
}

Singleton serialization in Kotlin


By : j.jor
Date : March 29 2020, 07:55 AM
should help you out There is no way to reassign the global reference to a singleton with a new instance. At most you can write out the properties during serialization, and then on deserialization directly read the properties and mutate the state in the original object. It will require custom code for you to assign the properties into the object either by direct assignment or reflection. It would be better if you make your own singleton mechanism that holds an instance that you can swap out to be another instance that you deserialize.

Getting a Singleton in Kotlin


By : Rickard Hansson
Date : March 29 2020, 07:55 AM
I wish this helpful for you There's a great answer here for why the field should be volatile. Essentially, without it, it's possible for one thread to get a reference to the instance before it has been fully constructed.
For the getInstance() function, you have:
code :
instance ?:
synchronized(this) {
    instance ?:
}
CarRepository(carDao).also { instance = it }
fun getInstance(carDao: CarDao): CarRepository {
    var cachedInstance = instance
    if (cachedInstance != null) {
        return cachedInstance
    }

    synchronized(this) {
        cachedInstance = instance
        if (cachedInstance == null) {
            cachedInstance = CarRepository(carDao)
            instance = cachedInstance
        }
        return cachedInstance
    }
}
val carDao1 = CarDaoImpl1()
val carDao2 = CarDaoImpl2()

val carRepo1 = CarRepository.getInstance(carDao1)
val carRepo2 = CarRepository.getInstance(carDao2)

// carRepo2 actually points to carDao1!

Kotlin singleton: How to copy object from singleton


By : avak
Date : March 29 2020, 07:55 AM
may help you . I would argue that mutating an object in this way should be avoided at all costs.
Luckily, Kotlin allows to achieve that using data classes with only value members:
code :
data class Food(val foodID: Int, 
             /* probably more fields here */)
return foodEntity.copy(foodID= 7)

Which is static and which is singleton in kotlin?


By : Abu Umar
Date : March 29 2020, 07:55 AM
To fix the issue you can do From official Kotlin docs:
Related Posts Related Posts :
  • Kotlin, unresolved reference on everything in VSCode
  • brief function code for null check in kotlin
  • How to capture an argument that was passed to a mocked function and return it?
  • Issue when trying to import Jacoco code coverage to SonarQube: Cannot import coverage information for file, coverage dat
  • Proposed change of `equals` to `==` can't be applied to Char and String?
  • How to use kotlin's default parameter only if the input is not null?
  • Please Explain to me this kotlin statement?
  • How to check if a string is a valid email in android?
  • This annotation is not applicable to target member property without backing field or delegate
  • How to split on unicode whitespace in kotlin
  • How can Kotlin's Set be covariant when contains() takes E?
  • Kotlin inline class in JUnit tests
  • Lambda as a function parameter -> accept methods only from particular class
  • Kotlin - How do I concatenate a String to an Int value?
  • Why I Cannot Access to this function?
  • Kotlin test, how to run BeforeEach with DescribeSpec test style
  • Convince Kotlin compiler map has a key
  • how do you declare static property in kotlin?
  • How can i call an interface in kotlin?
  • Check if any array item is not empty
  • kotlin, where the return from inside the let go
  • Kotlin: Should mutableList be declared as Val or Var?
  • Convert Long to String in Kotlin
  • Extension property inside class: Unresolved reference: errorResponse
  • How to extend enums in Kotlin?
  • Idiomatic way in kotlin to transform/append to a list?
  • How to avoid nest 「null check」by "?.let"?
  • How to simply add another source to MediatorLiveData in kotlin?
  • Convert Set<Int> to varargs efficiently in Kotlin
  • Getting an error Using 'body(): ResponseBody?' is an error. moved to val with okhttp
  • Kotlin String to Int or zero (default value)
  • Return value only of the faster coroutine
  • Is there a Kotlin Coroutines Channel equivalent of RxJava's onDispose?
  • Create fat jar from kotlin multiplatform project
  • Short circuiting operation in Kotlin sequences
  • How to output deprecation warnings for Kotlin code?
  • Why does generated getter method have dollar signs in it?
  • For a final class why does when complain?
  • Reference value of constant with KDoc
  • How to create this coroutines in kotlin?
  • OkHttp: NoSuchMethodError copyInto in TlsUtil
  • Why do unreachable statements method not result in a compilation error?
  • Static/Const map key check at compile time
  • Escaping double quotes inside backticks
  • Does Kotlin have primitive types?
  • What is exactly null in kotlin and why i can't cause NPE with it?
  • Why would you use a Kotlin companion object rather than an initializer block for creation?
  • how to use operator overloading in Kotlin to divide a number by a numeric vector
  • How to use get() with backing fields in kotlin
  • How to map string to function and call it later
  • Kotlin enum constructor argument 'must be initialized' with companion object constant without qualifier name
  • Please explain to me class delegation in Kotlin
  • Error:(1, 41) Kotlin: Symbol is declared in module 'jdk.internal.opt' which does not export package 'jdk.i
  • How to properly make blocking service calls with Kotlin coroutines?
  • Gson SerializedName in a Kotlin interface
  • Kotlin convert FileTime to day, month, year
  • Kotlin how to move a file to a other directory?
  • If first param is true, then must pass second param in function
  • MutableLiveData for collections
  • How to replace long chain of forEach{} statements in Kotlin?
  • shadow
    Privacy Policy - Terms - Contact Us © 35dp-dentalpractice.co.uk