content: /*
   * Copyright 2019 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.test.espresso.web.util.concurrent;
  
  import androidx.annotation.NonNull;
  import androidx.annotation.Nullable;
  import com.google.common.util.concurrent.ListenableFuture;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.Future;
  
  /**
   * Forked from androidx.camera package to avoid full Guava dependency.
   *
   * <p>A callback for accepting the results of a {@link java.util.concurrent.Future} computation
   * asynchronously.
   *
   * <p>To attach to a {@link ListenableFuture} use {@link Futures#addCallback}.
   *
   * @author Anthony Zana
   * @since 10.0
   * @param <V>
   */
  public interface FutureCallback<V> {
    /** Invoked with the result of the {@code Future} computation when it is successful. */
    void onSuccess(@Nullable 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} with a
     * non-{@code null} cause, then the cause is passed to this method. Any other thrown object is
     * passed unaltered.
     */
    void onFailure(@NonNull Throwable t);
  }
  