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.server.purgatory;
  
  import org.apache.kafka.common.utils.KafkaThread;
  
  import java.util.List;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.concurrent.ThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  import java.util.function.BiConsumer;
  
  public class DelayedFuturePurgatory {
      private final DelayedOperationPurgatory<DelayedFuture<?>> purgatory;
      private final ThreadPoolExecutor executor;
      private final DelayedOperationKey purgatoryKey;
  
      public DelayedFuturePurgatory(String purgatoryName, int brokerId) {
          this.purgatory = new DelayedOperationPurgatory<>(purgatoryName, brokerId);
          this.executor = new ThreadPoolExecutor(
              1,
              1,
              0,
              TimeUnit.MILLISECONDS,
              new LinkedBlockingQueue<>(),
              r -> new KafkaThread("DelayedExecutor-" + purgatoryName, r, true));
          this.purgatoryKey = () -> "delayed-future-key";
      }
  
      public <T> DelayedFuture<T> tryCompleteElseWatch(
          long timeoutMs,
          List<CompletableFuture<T>> futures,
          Runnable responseCallback
      ) {
          DelayedFuture<T> delayedFuture = new DelayedFuture<>(timeoutMs, futures, responseCallback);
          boolean done = purgatory.tryCompleteElseWatch(delayedFuture, List.of(purgatoryKey));
          if (!done) {
              BiConsumer<Void, Throwable> callbackAction = (result, exception) -> delayedFuture.forceComplete();
              CompletableFuture.allOf(futures.toArray(new CompletableFuture<?>[0])).whenCompleteAsync(callbackAction, executor);
          }
          return delayedFuture;
      }
  
      public void shutdown() throws Exception {
          executor.shutdownNow();
          executor.awaitTermination(60, TimeUnit.SECONDS);
          purgatory.shutdown();
      }
  
      public boolean isShutdown() {
          return executor.isShutdown();
      }
  }
  