YashishDua

var mutex = &sync.Mutex{}
var wg sync.WaitGroup

func generateMessage(message string) {
  //...
  
	wg.Add(1)
	go func() {
		defer wg.Done()
		printMessage(message)

YashishDua

func generateMessage(message string) {
  // Buffered Channel of type Boolean
	done := make(chan bool, 1)
	go printMessage(done, message)
  
  // Waiting to receive value from channel
	<-done
}

func printMessage(done chan bool, message string) {

YashishDua

class MainActivity: AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val viewModel = ViewModelProviders.of(this).get(SharedViewModel::class.java)
        viewModel.data.observe(this, Observer {
            
        })
    }
}

YashishDua

class WallDetailFragment : Fragment() {

    private lateinit var model: SharedViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        model = activity?.run {
            ViewModelProviders.of(this).get(SharedViewModel::class.java)
        } ?: throw Exception("Invalid Activity")
        model.data.observe(this, Observer<Item> { item ->

YashishDua

class WallFragment : Fragment() {

    private lateinit var itemSelector: Selector
    private lateinit var model: SharedViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        model = activity?.run {
            ViewModelProviders.of(this).get(SharedViewModel::class.java)
        } ?: throw Exception("Invalid Activity")

YashishDua

class SharedViewModel : ViewModel() {
    val data = MutableLiveData<Item>()

    fun data(item: Item) {
        data.value = item
    }
}

YashishDua

interface FragmentListener {
  fun handleOnClick()
}

YashishDua

class MainActivity : AppCompatActivity(), FragmentListener {  
  // ...

  override fun handleOnClick() {
      // Action to implement
  }
}

YashishDua

class WallFragment : Fragment() {

    companion object {
        fun newInstance() = WallFragment()
    }

    private lateinit var fragmentListener: FragmentListener

    override fun onAttach(context: Context?) {
        super.onAttach(context)

YashishDua

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