src/main/java/org/openecomp/datarouter/util/FileWatcher.java


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/**
 * ============LICENSE_START=======================================================
 * DataRouter
 * ================================================================================
 * Copyright © 2017 AT&T Intellectual Property.
 * Copyright © 2017 Amdocs
 * All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 *
 * ECOMP and OpenECOMP are trademarks
 * and service marks of AT&T Intellectual Property.
 */
package org.openecomp.datarouter.util;

import java.io.File;
import java.util.TimerTask;

public abstract class FileWatcher extends TimerTask {
  private long timeStamp;
  private File file;

  public FileWatcher(File file) {
    this.file = file;
    this.timeStamp = file.lastModified();
  }

  public final void run() {
    long timeStamp = file.lastModified();

    if ((timeStamp - this.timeStamp) > 500) {
      this.timeStamp = timeStamp;
      onChange(file);
    }
  }
  
  protected abstract void onChange(File file);
}