001/*
002 * SPDX-License-Identifier: Apache-2.0
003 *
004 * Copyright 2025-2026 The Enola <https://enola.dev> Authors
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 *     https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package dev.enola.common.concurrent;
019
020import com.google.common.util.concurrent.FutureCallback;
021import com.google.common.util.concurrent.Futures;
022import com.google.common.util.concurrent.ListenableFuture;
023
024import org.jspecify.annotations.Nullable;
025
026import java.util.function.BiConsumer;
027
028public final class ListenableFutures {
029
030    public static <T> void whenComplete(
031            ListenableFuture<T> future,
032            BiConsumer<? super @Nullable T, ? super @Nullable Throwable> action) {
033        Futures.addCallback(
034                future,
035                new FutureCallback<>() {
036                    @Override
037                    public void onSuccess(T result) {
038                        action.accept(result, null);
039                    }
040
041                    @Override
042                    public void onFailure(Throwable t) {
043                        action.accept(null, t);
044                    }
045                },
046                Executors.newListeningDirectExecutor());
047    }
048
049    private ListenableFutures() {}
050}