Create a callback function with another callback inside - kotlin

Question

My apologies for the bad title, I'm fairly new to callbacks and I'm not sure how to explain what I'm trying to achieve.
I have a class called MyClass that has a function connectToService inside of it.
The function connectToService does some calculations and then calls a function with a callback, like this:
fun connectToService() {
//Whatever calculations
val a = 7
var b = 3
var c = a + b
val token = MyToken()
token.actionCallback = object: SuperSecretObject {
override fun onSuccess(asyncActionToken: MyToken) {
c++
}
override fun onFailure(asyncActionToken: MyToken) {
c--
}
}
}
I want to create another class, YourClass which creates an object of MyClass and then calls the connectToService function. When the connectToService function finishes either the onSuccess or onFailurefunctions, I want to do something depending on which one was triggered (something different each time, thats why I can't put it inside the onSuccess or onFailure blocks of code).
Something like this:
//Inside `yourClass`
private fun myFunc() {
val yourClassObj = YourClass()
youClassObj.connectToService {
if(onSuccess)
reinventTheWheel()
else
squareIt()
}
youClassObj.connectToService {
combAWatermelon()
}
youClassObj.connectToService {
sharpenMyHammer()
}
}
Is this possible? If so, how can I achieve it? If it's not, what would be the closest solution to this requirement?
EDIT:
More detailed information has been requested, so while I can't provide exact details, I'll do my best to explain what's going on.
I'm basically working on a library to simplify petitions. For example, MQTT petitions. This is something tht resembles what I want to achieve:
/**
* Subscribes to a list of topics and handles the results
*/
fun subscribe(client: MqttAndroidClient, list: MutableList<String>, onMsg: ((String, MqttMessage)->Unit)?=null, conLost: ((Throwable)->Unit)?=null, delComp: ((IMqttDeliveryToken)->Unit)?=null) {
if (client.isConnected) { //Assert connection
for(x in list.iterator()) { //Subscribe to events
client.subscribe(x, 0)
}
client.setCallback(object : MqttCallback {
override fun connectionLost(cause: Throwable) { //Lost connection
Log.i("TAG", "Connection lost")
conLost?.let { it(cause) }
}
#Throws(java.lang.Exception::class)
override fun messageArrived(topic: String, message: MqttMessage) { //Arrived message
Log.i("TAG", "Message arrived: topic => $topic, message => $message")
onMsg?.let { it(topic, message) }
}
override fun deliveryComplete(token: IMqttDeliveryToken) { //Delivery complete
Log.i("TAG", "Delivery complete")
delComp?.let { it(token) }
}
})
}
}
The messageArrived function must have a behaviour that can be customized depending on the app it's being used on.
For example, on one app I want the onMsg() function to be like this:
when(topic) {
"firstTopic" -> {
localVariable++
}
"secondTopic" -> {
localMethod()
}
"thirdTopic" -> {
localClass.variable.method()
}
}
If I'm using it on an Android device, I'd like to be able to update the interface, doing Android API calls, etc.

Answer 1

I'm not sure I got your question correctly. I think what you are looking for is passing lambdas.
fun connectToService(onSucc: ()->Unit, onFail: ()->Unit) {
//Whatever calculations
MyToken().actionCallback = object: SuperSecretObject {
override fun onSuccess(asyncActionToken: MyToken) {
onSucc()
}
override fun onFailure(asyncActionToken: MyToken) {
onFail()
}
}
}
Then you can call the function like this:
connectToService({ /* Something */ }, { /* Something else */ })