PlotObserver.java

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 * Mission Control Technologies, Copyright (c) 2009-2012, United States Government
 * as represented by the Administrator of the National Aeronautics and Space 
 * Administration. All rights reserved.
 *
 * The MCT platform is licensed under the Apache License, Version 2.0 (the 
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package gov.nasa.arc.mct.fastplot.bridge;

/**
 * Observer in the Observer pattern. Informed of updates to the subject plot's.
 * 
 *  http://en.wikipedia.org/wiki/Observer_pattern
 */
public interface PlotObserver {
   
   /**
    * Observer is informed about changes to the start and end times of the subject plot.
    * @param startTime
    * @param endTime
    */
   public void updateTimeAxis(PlotSubject subject, long startTime, long endTime);
   
   /**
    * Observer is informed about any axis changes
    * @param subject
    * @param axis
    */
   public void plotAxisChanged(PlotSubject subject, AbstractAxis axis);
   
   /**
    * Observer is informed whenever data is plotted (typically at the end of the feed 
    * cycle)
    */
   public void dataPlotted();
}