/* Marker interface for receivers that have state semantics.
Copyright (c) 2004-2006 The Regents of the University of California.
All rights reserved.
Permission is hereby granted, without written agreement and without
license or royalty fees, to use, copy, modify, and distribute this
software and its documentation for any purpose, provided that the above
copyright notice and the following two paragraphs appear in all copies
of this software.
IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
ENHANCEMENTS, OR MODIFICATIONS.
PT_COPYRIGHT_VERSION_2
COPYRIGHTENDKEY
*/
package ptolemy.actor;
//////////////////////////////////////////////////////////////////////////
//// StateReceiver
/**
This is a marker interface for receivers that have <i>state</i> semantics.
That is, whenever a get method is called on this receiver, the
current token is always available and returned. Further more, if
no put method is called between get methods, the returned tokens are
always the same. Usually, the receivers that implement this interface
have capacity of 1.
<p>
Receivers that do not implement this marker interface have <i>event</i>
semantics, which means that when a get method is called on the receiver,
the current token is returned and it is also removed from the receiver.
@see ptolemy.domains.giotto.kernel.GiottoReceiver
@author Haiyang Zheng
@version $Id$
@since Ptolemy II 4.1
@Pt.ProposedRating Yellow (hyzheng)
@Pt.AcceptedRating Red (hyzheng)
*/
public interface StateReceiver {
}