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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 ro.ciprianpascu.sbus.util;

/**
 * A cleanroom implementation of the Observer interface
 * for the Observable design pattern.
 * 
 *
 * @author Dieter Wimberger
 * @author Ciprian Pascu
 (wimpi)
 * @version %I% (%G%)
 */
public interface Observer {

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

}// interface Observer