com.caucho.v5.io.Dependency Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of baratine Show documentation

A reactive Java web server.

There is a newer version: 1.0.1

/*
 * Copyright (c) 1998-2015 Caucho Technology -- all rights reserved
 *
 * This file is part of Baratine(TM)(TM)
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Baratine is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Baratine is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Baratine; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.v5.io;

import java.util.logging.Logger;

/**
 * Interface representing a resource that might change.
 */
public interface Dependency {
  /**
   * Returns true if the underlying resource has changed.
   */
  boolean isModified();
  
  /**
   * Log the reason for a modification, returning true if this
   * dependency was modified.
   */
  default boolean logModified(Logger log)
  {
    if (isModified()) {
      log.finer(this + " is modified");
      
      return true;
    }
    else {
      return false;
    }
  }
  
  static Dependency alwaysModified()
  {
    return AlwaysModified.create();
  }

  static Dependency neverModified()
  {
    return NeverModified.create();
  }
}