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.connect.mirror;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.time.Duration;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.Executors;
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  
  class Scheduler implements AutoCloseable {
      private static final Logger LOG = LoggerFactory.getLogger(Scheduler.class);
  
      private final String name;
      private final ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
      private final Duration timeout;
      private boolean closed = false;
  
      Scheduler(String name, Duration timeout) {
          this.name = name;
          this.timeout = timeout;
      }
  
      Scheduler(Class<?> clazz, String role, Duration timeout) {
          this("Scheduler for " + clazz.getSimpleName() + ": " + role, timeout);
      }
  
      void scheduleRepeating(Task task, Duration interval, String description) {
          if (interval.toMillis() < 0L) {
              return;
          }
          executor.scheduleAtFixedRate(() -> executeThread(task, description, true), 0, interval.toMillis(), TimeUnit.MILLISECONDS);
      }
   
      void scheduleRepeatingDelayed(Task task, Duration interval, String description) {
          if (interval.toMillis() < 0L) {
              return;
          }
          executor.scheduleAtFixedRate(() -> executeThread(task, description, true), interval.toMillis(),
              interval.toMillis(), TimeUnit.MILLISECONDS);
      }
  
      void execute(Task task, String description) {
          try {
              executor.submit(() -> executeThread(task, description, true)).get(timeout.toMillis(), TimeUnit.MILLISECONDS);
          } catch (InterruptedException e) {
              LOG.warn("{} was interrupted running task: {}", name, description);
          } catch (TimeoutException e) {
              LOG.error("{} timed out running task: {}", name, description);
          } catch (Throwable e) {
              LOG.error("{} caught exception in task: {}", name, description, e);
          }
      } 
  
      void executeAsync(Task task, String description) {
          executor.submit(() -> executeThread(task, description, false));
      }
  
      public void close() {
          closed = true;
          executor.shutdown();
          try {
              boolean terminated = executor.awaitTermination(timeout.toMillis(), TimeUnit.MILLISECONDS);
              if (!terminated) {
                  LOG.error("{} timed out during shutdown of internal scheduler.", name);
              }
          } catch (InterruptedException e) {
              LOG.warn("{} was interrupted during shutdown of internal scheduler.", name);
          }
      }
  
      interface Task {
          void run() throws InterruptedException, ExecutionException;
      }
  
      private void run(Task task, String description, boolean checkTimeout) {
          try {
              long start = System.currentTimeMillis();
              task.run();
              long elapsed = System.currentTimeMillis() - start;
              LOG.info("{} took {} ms", description, elapsed);
              if (checkTimeout && elapsed > timeout.toMillis()) {
                  LOG.warn("{} took too long ({} ms) running task: {}", name, elapsed, description);
              }
          } catch (InterruptedException e) {
              LOG.warn("{} was interrupted running task: {}", name, description);
          } catch (Throwable e) {
              LOG.error("{} caught exception in scheduled task: {}", name, description, e);
          }
      }
  
      private void executeThread(Task task, String description, boolean checkTimeout) {
          Thread.currentThread().setName(name + "-" + description);
          if (closed) {
              LOG.info("{} skipping task due to shutdown: {}", name, description);
              return;
          }
          run(task, description, checkTimeout);
      }
  }
  