/* A parameter to store an integer number priority in an actor.
Copyright (c) 2008 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
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PT_COPYRIGHT_VERSION_2
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*/
package ptolemy.actor.parameters;
import ptolemy.data.expr.Parameter;
import ptolemy.data.type.BaseType;
import ptolemy.kernel.util.IllegalActionException;
import ptolemy.kernel.util.NameDuplicationException;
import ptolemy.kernel.util.NamedObj;
//////////////////////////////////////////////////////////////////////////
//// PriorityParameter
/**
A parameter to store an integer number priority in an actor. The default
priority is 0. A smaller number designates a higher priority. In an execution
with a timed model of computation, such as DE, when two actors are scheduled
with the same timestamp and microstep, they are fired according to the priority
specified for them. The actor with a smaller priority number is fired before
the one with a greater priority number.
@author Thomas Huining Feng
@version $Id$
@since Ptolemy II 7.1
@Pt.ProposedRating Red (tfeng)
@Pt.AcceptedRating Red (tfeng)
*/
public class Priority extends Parameter {
/** Construct a priority parameter with the given name contained by the
* specified entity. The container argument must not be null, or a
* NullPointerException will be thrown. This parameter will use the
* workspace of the container for synchronization and version counts.
* If the name argument is null, then the name is set to the empty string.
* The object is not added to the list of objects in the workspace
* unless the container is null.
* Increment the version of the workspace.
* @param container The container.
* @param name The name of the parameter.
* @exception IllegalActionException If the parameter is not of an
* acceptable class for the container.
* @exception NameDuplicationException If the name coincides with
* a parameter already in the container.
*/
public Priority(NamedObj container, String name)
throws IllegalActionException, NameDuplicationException {
super(container, name);
setTypeEquals(BaseType.INT);
setExpression("0");
}
}