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jamod is an object oriented implementation of the Modbus protocol, realized 100% in Java. It allows to quickly realize master and slave applications in various transport flavors (IP and serial).

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/***
 * Copyright 2002-2010 jamod development team
 *
 * 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 net.wimpi.modbus.util;

/**
 * A cleanroom implementation of the Observer interface
 * for the Observable design pattern.
 * 
 *
 * @author Dieter Wimberger (wimpi)
 * @version 1.2 (@date@)
 */
public interface Observer {

  /**
   * Updates the state of this Observer to be in
   * synch with an Observable instance.
   * The argument should usually be an indication of the
   * aspects that changed in the Observable.
   *
   * @param o an Observable instance.
   * @param arg an arbitrary argument to be passed.
   */
  public void update(Observable o, Object arg);

}//interface Observer