Java tutorial
/* * Copyright (C) 2012-2016 DuyHai DOAN * * 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 info.archinnov.achilles.internals.futures; import java.util.concurrent.CompletableFuture; import java.util.concurrent.ExecutorService; import com.google.common.util.concurrent.FutureCallback; import com.google.common.util.concurrent.Futures; import com.google.common.util.concurrent.ListenableFuture; /** * Copy from original class at https://github.com/lukas-krecan/future-converter/blob/master/java8-guava/src/main/java/net/javacrumbs/futureconverter/java8guava/FutureConverter.java * Licenced under Apache 2.0 */ public class FutureUtils { public static <T> CompletableFuture<T> toCompletableFuture(ListenableFuture<T> listenableFuture, ExecutorService executor) { CompletableFuture<T> completable = new CompletableListenableFuture<>(listenableFuture); Futures.addCallback(listenableFuture, new FutureCallback<T>() { @Override public void onSuccess(T result) { completable.complete(result); } @Override public void onFailure(Throwable t) { completable.completeExceptionally(t); } }, executor); return completable; } private static final class CompletableListenableFuture<T> extends CompletableFuture<T> { private final ListenableFuture<T> listenableFuture; public CompletableListenableFuture(ListenableFuture<T> listenableFuture) { this.listenableFuture = listenableFuture; } @Override public boolean cancel(boolean mayInterruptIfRunning) { boolean result = listenableFuture.cancel(mayInterruptIfRunning); super.cancel(mayInterruptIfRunning); return result; } } }