package android.os

import kotlinx.coroutines.Dispatchers

import kotlinx.coroutines.GlobalScope

import kotlinx.coroutines.launch

import kotlinx.coroutines.withContext

import java.util.concurrent.Executor

abstract class AsyncTask {

companion object {

@JvmField

val THREAD_POOL_EXECUTOR = Executor {

GlobalScope.launch {

it.run()

}

}

}

fun execute(vararg params: Any): AsyncTask {

GlobalScope.launch {

withContext(Dispatchers.Main) { onPreExecute() }

val result = doInBackground(*params)

withContext(Dispatchers.Main) { onPostExecute(result) }

}

return this

}

protected abstract fun doInBackground(vararg params: Any): Any

protected open fun onPreExecute() {}

protected open fun onPostExecute(result: Any) {}

}