content: /*
   * Copyright © 2018-2025 Commonwealth Scientific and Industrial Research
   * Organisation (CSIRO) ABN 41 687 119 230.
   *
   * Licensed 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 au.csiro.pathling.utilities;
  
  
  import static org.apache.hadoop.shaded.org.apache.commons.io.IOUtils.closeQuietly;
  
  import jakarta.annotation.Nonnull;
  import java.io.Closeable;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import lombok.extern.slf4j.Slf4j;
  
  /**
   * A {@link Closeable} that closes a collection of underlying resources.
   *
   * @author Piotr Szul
   */
  @Slf4j
  public class ResourceCloser implements Closeable {
  
    @Nonnull
    private final List<Closeable> resourcesToClose;
  
  
    /**
     * Constructs a new {@link ResourceCloser} with provided resources to close.
     *
     * @param resourcesToClose the resources to close
     */
    protected ResourceCloser(@Nonnull final Closeable... resourcesToClose) {
      this.resourcesToClose = new ArrayList<>(Arrays.asList(resourcesToClose));
    }
  
    /**
     * Adds a resource to the list of resources to close.
     *
     * @param resource the resource to close
     * @param <T> the type of the resource
     * @return the resource
     */
    protected <T extends Closeable> T registerResource(@Nonnull final T resource) {
      synchronized (resourcesToClose) {
        resourcesToClose.add(resource);
        return resource;
      }
    }
  
    @Override
    public void close() {
      log.debug("Closing {} resources for: {}", resourcesToClose.size(), this);
      synchronized (resourcesToClose) {
        for (final Closeable closeable : resourcesToClose) {
          log.debug("Closing resource: {} in: {}", closeable, this);
          closeQuietly(closeable,
              ex -> log.warn("Ignoring an error while closing resource: {}", closeable, ex));
        }
      }
    }
  }
  