| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.bookkeeper.mledger.util; |
| |
| import java.util.List; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import org.apache.bookkeeper.mledger.AsyncCallbacks.CloseCallback; |
| import org.apache.bookkeeper.mledger.ManagedLedgerException; |
| |
| /** |
| * Conveniences to use with {@link CompletableFuture}. |
| */ |
| public class Futures { |
| |
| public static CompletableFuture<Void> nullPromise_ = CompletableFuture.completedFuture(null); |
| |
| /** |
| * Adapts a {@link CloseCallback} to a {@link CompletableFuture}. |
| */ |
| public static class CloseFuture extends CompletableFuture<Void> implements CloseCallback { |
| |
| @Override |
| public void closeComplete(Object ctx) { |
| complete(null); |
| } |
| |
| @Override |
| public void closeFailed(ManagedLedgerException exception, Object ctx) { |
| completeExceptionally(exception); |
| } |
| } |
| |
| public static CompletableFuture<Void> waitForAll(List<CompletableFuture<Void>> futures) { |
| final CompletableFuture<Void> compositeFuture = new CompletableFuture<>(); |
| final AtomicInteger count = new AtomicInteger(futures.size()); |
| |
| for (CompletableFuture<Void> future : futures) { |
| future.whenComplete((r, ex) -> { |
| if (ex != null) { |
| compositeFuture.completeExceptionally(ex); |
| } else if (count.decrementAndGet() == 0) { |
| // All the pending futures did complete |
| compositeFuture.complete(null); |
| } |
| }); |
| } |
| |
| if (futures.isEmpty()) { |
| compositeFuture.complete(null); |
| } |
| |
| return compositeFuture; |
| } |
| } |