content: /*
   * 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.raft;
  
  import org.apache.kafka.common.errors.TimeoutException;
  import org.apache.kafka.server.util.ShutdownableThread;
  import org.apache.kafka.server.util.timer.Timer;
  import org.apache.kafka.server.util.timer.TimerTask;
  
  import java.util.concurrent.CompletableFuture;
  
  public class TimingWheelExpirationService implements ExpirationService {
  
      private static final long WORK_TIMEOUT_MS = 200L;
  
      private final ExpiredOperationReaper expirationReaper;
      private final Timer timer;
  
      public TimingWheelExpirationService(Timer timer) {
          this.timer = timer;
          this.expirationReaper = new ExpiredOperationReaper();
          expirationReaper.start();
      }
  
      @Override
      public <T> CompletableFuture<T> failAfter(long timeoutMs) {
          TimerTaskCompletableFuture<T> task = new TimerTaskCompletableFuture<>(timeoutMs);
          task.future.whenComplete((t, throwable) -> task.cancel());
          timer.add(task);
          return task.future;
      }
  
      public void shutdown() throws InterruptedException {
          expirationReaper.shutdown();
      }
  
      private static class TimerTaskCompletableFuture<T> extends TimerTask {
  
          private final CompletableFuture<T> future = new CompletableFuture<>();
  
          TimerTaskCompletableFuture(long delayMs) {
              super(delayMs);
          }
  
          @Override
          public void run() {
              future.completeExceptionally(new TimeoutException("Future failed to be completed before timeout of " + delayMs + " ms was reached"));
          }
      }
  
      private class ExpiredOperationReaper extends ShutdownableThread {
  
          ExpiredOperationReaper() {
              super("raft-expiration-reaper", false);
          }
  
          @Override
          public void doWork() {
              try {
                  timer.advanceClock(WORK_TIMEOUT_MS);
              } catch (InterruptedException e) {
                  throw new RuntimeException(e);
              }
          }
      }
  }
  