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.trogdor.task;
  
  import org.apache.kafka.common.internals.KafkaFutureImpl;
  import org.apache.kafka.common.utils.ThreadUtils;
  import org.apache.kafka.trogdor.common.Platform;
  
  import com.fasterxml.jackson.databind.node.TextNode;
  
  import java.util.concurrent.Executors;
  import java.util.concurrent.Future;
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.TimeUnit;
  
  public class SampleTaskWorker implements TaskWorker {
      private final SampleTaskSpec spec;
      private final ScheduledExecutorService executor;
      private Future<Void> future;
      private WorkerStatusTracker status;
  
      SampleTaskWorker(SampleTaskSpec spec) {
          this.spec = spec;
          this.executor = Executors.newSingleThreadScheduledExecutor(
              ThreadUtils.createThreadFactory("SampleTaskWorker", false));
          this.future = null;
      }
  
      @Override
      public synchronized void start(Platform platform, WorkerStatusTracker status,
                        final KafkaFutureImpl<String> haltFuture) {
          if (this.future != null)
              return;
          this.status = status;
          this.status.update(new TextNode("active"));
  
          Long exitMs = spec.nodeToExitMs().get(platform.curNode().name());
          if (exitMs == null) {
              exitMs = Long.MAX_VALUE;
          }
          this.future = platform.scheduler().schedule(executor, () -> {
              haltFuture.complete(spec.error());
              return null;
          }, exitMs);
      }
  
      @Override
      public void stop(Platform platform) throws Exception {
          this.future.cancel(false);
          this.executor.shutdown();
          this.executor.awaitTermination(1, TimeUnit.DAYS);
          this.status.update(new TextNode("halted"));
      }
  }
  