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Methods to use Coroutines in Kotlin


Coroutines are a technique to deal with multithreading in Kotlin, learn extra about it from the official docs:

https://kotlinlang.org/docs/coroutines-overview.html

An instance of a Coroutine in Kotlin

val runBlocking = runBlocking {
  sleep(5)
  delay(1_000L)
  launch {
    delay(1_100L)
    notice("inside launch")
  }
  notice("exterior launch")
}

Introducing the droop key phrase

coroutineScopes have to be in wrapping droop:

droop enjoyable coroutineFunction(): String {
  return coroutineScope {
    launch {
      println("take a look at")
    }
    "we return this string"
  }
}

runBlocking { println(coroutineFunction()) }

Making Asynchronous API calls utilizing Coroutines

droop enjoyable call2Apis() {
  val call1 = async {
    delay(1_000L)
    println("obtained information from api1 @ ${Instantaneous.now()}")
    "some information from api1"
  }
  val call2 = async P
    delay(1_500L)
    println("obtained information from api2 @ ${Instantaneous.now()}")
    "some information from api2"
  }

  println(call1.await() + " ${Instantaneous.now()}")
  println(call2.await() + " ${Instantaneous.now()}")

}

runBlocking { call2Apis() }
sleep(2)

Sharing states between Coroutines

Merely return a coroutineScope.

droop enjoyable call2Apis() {
  return coroutineScope {
    val call1 = async {
      delay(1_000L)
      println("obtained information from api1 @ ${Instantaneous.now()}")
      "some information from api1"
    }
    val call2 = async P
      println(call1.isCompleted) // false
      println(call1.await()) // pause and look forward to call1 to finish..
      delay(1_500L)
      println("obtained information from api2 @ ${Instantaneous.now()}")
      "some information from api2"
    }

    println(call1.await() + " ${Instantaneous.now()}")
    println(call2.await() + " ${Instantaneous.now()}")

  }
}

runBlocking { call2Apis() }
sleep(2)

Run duties as International Scope

runBlocking {
  GlobalScope.launch {
    //
  }
}
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