/**

 * AmbientTalk/2 Project

 * (c) Software Languages Lab, 2006 - 2009

 * Authors: Ambient Group at SOFT

 * 

 * The source code in this file is based on source code from Tyler Close's

 * Waterken server, Copyright 2008 Waterken Inc. Waterken's code is published

 * under the MIT license.

 * 

 * Permission is hereby granted, free of charge, to any person

 * obtaining a copy of this software and associated documentation

 * files (the "Software"), to deal in the Software without

 * restriction, including without limitation the rights to use,

 * copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following

 * conditions:

 *

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 * OTHER DEALINGS IN THE SOFTWARE.

 */

package edu.vub.at.trace;



import java.io.Serializable;



/**

 * An event loop turn counter.

 */

public class

TurnCounter implements Serializable {

	

	public interface FlipI {

        public void flip();

	}

	

    static private final long serialVersionUID = 1L;

    

    /**

     * URI for the event loop

     */

    public final String loop;



    /**

     * increment the turn counter

     */

    public final FlipI flip;

    

    /**

     * increment the anchor counter

     */

    public final Marker mark;

    

    private TurnCounter(final String loop, final FlipI flip, final Marker mark) {

        this.loop = loop;

        this.flip = flip;

        this.mark = mark;

    }

    

    /**

     * Constructs an instance.

     * @param loop  {@link #loop}

     */

    static public TurnCounter make(final String loop) {

    	

        class State implements Serializable {

            static private final long serialVersionUID = 1L;



            long turns = 0;     // id of current turn

            long anchors = 0;   // id of next anchor

        }

        

        final State m = new State();

        

        class Flip implements FlipI, Serializable {

            static private final long serialVersionUID = 1L;



            public void flip() {

                m.turns += 1;

                m.anchors = 0;

            }

        }

        class Mark implements Marker, Serializable {

            static private final long serialVersionUID = 1L;



            public Anchor apply() { return new Anchor(new Turn(loop, m.turns), m.anchors++); }

        }

        return new TurnCounter(loop, new Flip(), new Mark());

    }

}