| /* |
| * Copyright 2022 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. |
| */ |
| |
| package androidx.camera.previewview.internal.utils.futures; |
| |
| import androidx.annotation.RequiresApi; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.Future; |
| |
| /** |
| * Cloned from concurrent-futures package in Guava to AndroidX namespace since we would need |
| * ListenableFuture related implementation but not want to include whole Guava library. |
| * |
| * A callback for accepting the results of a {@link Future} computation |
| * asynchronously. |
| * |
| * <p>To attach to a {@link ListenableFuture} use {@link Futures#addCallback}. |
| * |
| * @author Anthony Zana |
| * @since 10.0 |
| * @param <V> |
| * |
| */ |
| @RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java |
| public interface FutureCallback<V> { |
| /** Invoked with the result of the {@code Future} computation when it is successful. */ |
| void onSuccess(V result); |
| |
| /** |
| * Invoked when a {@code Future} computation fails or is canceled. |
| * |
| * <p>If the future's {@link Future#get() get} method throws an {@link ExecutionException}, then |
| * the cause is passed to this method. Any other thrown object is passed unaltered. |
| */ |
| void onFailure(Throwable t); |
| } |
