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.bookkeeper.tls;
  
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.nio.file.attribute.FileTime;
  import lombok.Getter;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Holder class to validate file modification.
   */
  public class FileModifiedTimeUpdater {
      @Getter
      String fileName;
      @Getter
      FileTime lastModifiedTime;
  
      public FileModifiedTimeUpdater(String fileName) {
          this.fileName = fileName;
          this.lastModifiedTime = updateLastModifiedTime();
      }
  
      private FileTime updateLastModifiedTime() {
          if (fileName != null) {
              Path p = Paths.get(fileName);
              try {
                  return Files.getLastModifiedTime(p);
              } catch (IOException e) {
                  LOG.error("Unable to fetch lastModified time for file {}: ", fileName, e);
              }
          }
          return null;
      }
  
      public boolean checkAndRefresh() {
          FileTime newLastModifiedTime = updateLastModifiedTime();
          if (newLastModifiedTime != null && !newLastModifiedTime.equals(lastModifiedTime)) {
              this.lastModifiedTime = newLastModifiedTime;
              return true;
          }
          return false;
      }
  
      private static final Logger LOG = LoggerFactory.getLogger(FileModifiedTimeUpdater.class);
  }
  