| /* |
| * 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.flink.statefun.e2e.smoke; |
| |
| import java.time.Duration; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.LinkedBlockingDeque; |
| |
| /** |
| * Creates {@link CompletableFuture}s that can be completed successfully or unsuccessfully, within 1 |
| * millisecond delay. |
| */ |
| final class AsyncCompleter { |
| |
| private static final Throwable EXCEPTION; |
| |
| static { |
| Throwable t = new RuntimeException(); |
| t.setStackTrace(new StackTraceElement[0]); |
| EXCEPTION = t; |
| } |
| |
| private static final class Task { |
| final long time; |
| final CompletableFuture<Boolean> future; |
| final boolean success; |
| |
| public Task(boolean success) { |
| this.time = System.nanoTime(); |
| this.future = new CompletableFuture<>(); |
| this.success = success; |
| } |
| } |
| |
| private static final int ONE_MILLISECOND = Duration.ofMillis(1).getNano(); |
| private final LinkedBlockingDeque<Task> queue = new LinkedBlockingDeque<>(); |
| private boolean started; |
| |
| /** |
| * Returns a future that would be complete successfully, no sooner than 1 millisecond from now. |
| */ |
| CompletableFuture<Boolean> successfulFuture() { |
| return future(true); |
| } |
| |
| /** |
| * Returns a future that would be completed unsuccessfully, no sooner than 1 millisecond from now. |
| */ |
| CompletableFuture<Boolean> failedFuture() { |
| return future(false); |
| } |
| |
| private CompletableFuture<Boolean> future(boolean success) { |
| Task e = new Task(success); |
| queue.add(e); |
| return e.future; |
| } |
| |
| void start() { |
| if (started) { |
| return; |
| } |
| started = true; |
| Thread t = new Thread(this::run); |
| t.setDaemon(true); |
| t.start(); |
| } |
| |
| @SuppressWarnings({"InfiniteLoopStatement", "BusyWait"}) |
| void run() { |
| while (true) { |
| try { |
| Task e = queue.take(); |
| final long duration = System.nanoTime() - e.time; |
| if (duration < ONE_MILLISECOND) { |
| Thread.sleep(1); |
| } |
| CompletableFuture<Boolean> future = e.future; |
| if (e.success) { |
| future.complete(Boolean.TRUE); |
| } else { |
| future.completeExceptionally(EXCEPTION); |
| } |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| } |