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January 3, 2020 18:02
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Provide synchronous style invocation of Parse queries using suspend function and Kotlin 1.3 Coroutines
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| import androidx.lifecycle.LiveData | |
| import bolts.Task | |
| import com.parse.ParseObject | |
| import com.parse.ParseQuery | |
| import kotlin.coroutines.resume | |
| import kotlin.coroutines.resumeWithException | |
| import kotlin.reflect.KProperty | |
| import kotlinx.coroutines.* | |
| suspend fun <T> Task<T>.await(): T { | |
| // fast path | |
| if (isCompleted) { | |
| val e = error | |
| return if (e == null) { | |
| if (isCancelled) { | |
| throw CancellationException("Task $this was cancelled normally.") | |
| } else { | |
| @Suppress("UNCHECKED_CAST") | |
| result as T | |
| } | |
| } else { | |
| throw e | |
| } | |
| } | |
| return suspendCancellableCoroutine { cont -> | |
| onSuccess { | |
| val e = error | |
| if (e == null) { | |
| @Suppress("UNCHECKED_CAST") | |
| if (isCancelled) cont.cancel() else cont.resume(result as T) | |
| } else { | |
| cont.resumeWithException(e) | |
| } | |
| } | |
| } | |
| } | |
| fun <T : ParseObject> ParseQuery<T>.liveData(): LiveData<List<T>> { | |
| return object : LiveData<List<T>>() { | |
| override fun onActive() { | |
| findInBackground { items, error -> | |
| if (error == null) { | |
| GlobalScope.launch(Dispatchers.Main) { | |
| value = items | |
| } | |
| } | |
| } | |
| } | |
| override fun onInactive() { | |
| super.onInactive() | |
| if (isRunning) { | |
| cancel() | |
| } | |
| } | |
| } | |
| } |
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