package org.lsst.ccs.utilities.dispatch;
   
   
   import java.util.concurrent.CopyOnWriteArrayList;
   
   /**
    * An <TT>Observable</TT> with protocol control at compile time.
    * The update are processed in sequence.
    *
   * @author bernard Amade
   */
  public class SynchronousObservable<P> {
      protected CopyOnWriteArrayList<SynchronousObserver<P>> list = new java.util.concurrent.CopyOnWriteArrayList<SynchronousObserver<P>>() ;
  
      public void addObserver(SynchronousObserver<P> observer){
          this.list.add(observer);
      }
  
      public void removeObserver(SynchronousObserver<P> observer){
          this.list.remove (observer);
      }
  
      /**
       * do not need a call to <TT>setChanged</TT>: observers
       * are immediately notified.
       *
       * @param protocol
       */
      public void notifyObservers(P protocol) {
          for(SynchronousObserver<P> observer : list) {
              observer.update(protocol);
          }
      }
  }