| /* |
| * 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.kafka.common.utils; |
| |
| import org.apache.kafka.common.KafkaFuture; |
| import org.apache.kafka.common.internals.KafkaFutureImpl; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.TreeMap; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.ScheduledExecutorService; |
| |
| public class MockScheduler implements Scheduler, MockTime.MockTimeListener { |
| private static final Logger log = LoggerFactory.getLogger(MockScheduler.class); |
| |
| /** |
| * The MockTime object. |
| */ |
| private final MockTime time; |
| |
| /** |
| * Futures which are waiting for a specified wall-clock time to arrive. |
| */ |
| private final TreeMap<Long, List<KafkaFutureImpl<Long>>> waiters = new TreeMap<>(); |
| |
| public MockScheduler(MockTime time) { |
| this.time = time; |
| time.addListener(this); |
| } |
| |
| @Override |
| public Time time() { |
| return time; |
| } |
| |
| @Override |
| public synchronized void tick() { |
| long timeMs = time.milliseconds(); |
| while (true) { |
| Map.Entry<Long, List<KafkaFutureImpl<Long>>> entry = waiters.firstEntry(); |
| if ((entry == null) || (entry.getKey() > timeMs)) { |
| break; |
| } |
| for (KafkaFutureImpl<Long> future : entry.getValue()) { |
| future.complete(timeMs); |
| } |
| waiters.remove(entry.getKey()); |
| } |
| } |
| |
| public synchronized void addWaiter(long delayMs, KafkaFutureImpl<Long> waiter) { |
| long timeMs = time.milliseconds(); |
| if (delayMs <= 0) { |
| waiter.complete(timeMs); |
| } else { |
| long triggerTimeMs = timeMs + delayMs; |
| List<KafkaFutureImpl<Long>> futures = waiters.get(triggerTimeMs); |
| if (futures == null) { |
| futures = new ArrayList<>(); |
| waiters.put(triggerTimeMs, futures); |
| } |
| futures.add(waiter); |
| } |
| } |
| |
| @Override |
| public <T> Future<T> schedule(final ScheduledExecutorService executor, |
| final Callable<T> callable, long delayMs) { |
| final KafkaFutureImpl<T> future = new KafkaFutureImpl<>(); |
| KafkaFutureImpl<Long> waiter = new KafkaFutureImpl<>(); |
| waiter.thenApply(new KafkaFuture.BaseFunction<Long, Void>() { |
| @Override |
| public Void apply(final Long now) { |
| executor.submit(new Callable<Void>() { |
| @Override |
| public Void call() { |
| // Note: it is possible that we'll execute Callable#call right after |
| // the future is cancelled. This is a valid sequence of events |
| // that the author of the Callable needs to be able to handle. |
| // |
| // Note 2: If the future is cancelled, we will not remove the waiter |
| // from this MockTime object. This small bit of inefficiency is acceptable |
| // in testing code (at least we aren't polling!) |
| if (!future.isCancelled()) { |
| try { |
| log.trace("Invoking {} at {}", callable, now); |
| future.complete(callable.call()); |
| } catch (Throwable throwable) { |
| future.completeExceptionally(throwable); |
| } |
| } |
| return null; |
| } |
| }); |
| return null; |
| } |
| }); |
| log.trace("Scheduling {} for {} ms from now.", callable, delayMs); |
| addWaiter(delayMs, waiter); |
| return future; |
| } |
| } |