Java tutorial
//package com.java2s; /* * Grakn - A Distributed Semantic Database * Copyright (C) 2016 Grakn Labs Limited * * Grakn is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Grakn is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Grakn. If not, see <http://www.gnu.org/licenses/gpl.txt>. */ import java.util.List; import java.util.concurrent.CompletableFuture; import static java.util.stream.Collectors.toList; public class Main { static public <T> CompletableFuture<List<T>> all(List<CompletableFuture<T>> cf) { return CompletableFuture.allOf(cf.toArray(new CompletableFuture[cf.size()])) .thenApply(v -> cf.stream().map(CompletableFuture::join).collect(toList())); } }