Created
December 29, 2020 16:41
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MVI vs MVVM
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// Here counter can show 1 after incrementCounter is called | |
class ExampleViewModel : ViewModel() { | |
private val _counter = MutableLiveData(0) | |
init { | |
viewModelScope.launch(Dispatchers.IO) { | |
// Thread 1 | |
delay(500) | |
_counter.postValue(_counter.value?.plus(1)) | |
} | |
} | |
fun incrementCounter() = viewModelScope.launch(Dispatchers.IO) { // UI calls this | |
// Thread 2 | |
_counter.postValue(_counter.value?.plus(1)) | |
} | |
// Thread 1 reads 0 | |
// Thread 1 looses cpu | |
// Thread 2 reads 0 | |
// Thread 2 looses cpu | |
// Thread 1 writes 1 | |
// Thread 2 writes 1 | |
} | |
// Here counter will always show 2 after incrementCounter called | |
class ExampleMviViewModel : ViewModel() { | |
init { | |
reduceState { state -> | |
delay(500) | |
state.copy(count = state.count + 1) | |
} | |
} | |
fun incrementCounter = reduceState { state -> | |
state.copy(count = state.count + 1) | |
} | |
} |
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