Concurrent Hash Map in Kotlin

Question

Is it possible to implement a concurrent hash map purely in Kotlin (without Java dependency)? I am new to Kotlin and it looks like there is no obvious API available in kotlin.collections.

Answer 1

You can probably convert the source without too many issues. It's freely available, here for example. The concurrency model of Kotlin multiplatform (which I'm guessing is your goal, there's no point in reimplementing it if you only target the JVM) is a bit different than the one Java uses, there are no locks for example. But there's no reason why that would prevent it.

The following resources might also help you with the implementation:

• Concurrency in Kotlin/Native
• kotlin.native.concurrent package
• Replacement for synchronized
• Official Kotlin/Native Concurrency tutorial

Answer 2

You can try:

val emitters: ConcurrentMap<String, Any> = ConcurrentHashMap()

// get
  val obj: Any = emitters[email]

// put:
  emitters[email] = this

// delete
  emitters.remove(email)

Such way, u don't need to add any library to your project