| /* |
| * Copyright 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| @file:Suppress("NOTHING_TO_INLINE") |
| |
| package androidx.work |
| |
| import androidx.annotation.RestrictTo |
| import com.google.common.util.concurrent.ListenableFuture |
| import kotlinx.coroutines.suspendCancellableCoroutine |
| import java.util.concurrent.CancellationException |
| import java.util.concurrent.ExecutionException |
| import kotlin.coroutines.resume |
| import kotlin.coroutines.resumeWithException |
| |
| /** |
| * Awaits for the completion of the [ListenableFuture] without blocking a thread. |
| * |
| * @return R The result from the [ListenableFuture] |
| * |
| * @hide |
| */ |
| @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) |
| suspend inline fun <R> ListenableFuture<R>.await(): R { |
| // Fast path |
| if (isDone) { |
| try { |
| return get() |
| } catch (e: ExecutionException) { |
| throw e.cause ?: e |
| } |
| } |
| return suspendCancellableCoroutine { cancellableContinuation -> |
| addListener(Runnable { |
| try { |
| cancellableContinuation.resume(get()) |
| } catch (throwable: Throwable) { |
| val cause = throwable.cause ?: throwable |
| when (throwable) { |
| is CancellationException -> cancellableContinuation.cancel(cause) |
| else -> cancellableContinuation.resumeWithException(cause) |
| } |
| } |
| }, DirectExecutor.INSTANCE) |
| } |
| } |
