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svn-gvsig-desktop / tags / v2_0_0_Build_2020 / libraries / libRemoteServices / src / org / gvsig / remoteclient / taskplanning / FIFOTaskPlanner.java @ 33856

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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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 *
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 * Copyright (C) 2005 IVER T.I. and Generalitat Valenciana.
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.
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 *
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 * For more information, contact:
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 *
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 *  Generalitat Valenciana
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 *   Conselleria d'Infraestructures i Transport
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 *   Av. Blasco Ib??ez, 50
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 *   46010 VALENCIA
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 *   SPAIN
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 *
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 *      +34 963862235
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 *   gvsig@gva.es
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 *      www.gvsig.gva.es
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 *
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 *    or
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 *
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 *   IVER T.I. S.A
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 *   Salamanca 50
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 *   46005 Valencia
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 *   Spain
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 *
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 *   +34 963163400
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 *   dac@iver.es
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 */
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/* CVS MESSAGES:
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*
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* $Id: FIFOTaskPlanner.java 29670 2009-06-29 17:17:55Z jpiera $
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* $Log$
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* Revision 1.1  2006-05-12 07:15:45  jaume
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* *** empty log message ***
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*
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* Revision 1.1  2006/05/11 17:18:06  jaume
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* Un planificador, monitorizador, de descargas que trabaja en segundo plano
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*
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*
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*/
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package org.gvsig.remoteclient.taskplanning;
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/**
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 * A simple FIFO task planner. The tasks returned by this planner are executed
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 * enterely. It does not issue another task until the current is finished. 
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 * @author jaume
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 *
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 */
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public class FIFOTaskPlanner implements ITaskPlanner {
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        IQueue queue;
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        /**
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         * Creates a new instance of FIFOTaskPlanner that will work against the
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         * queue passed as paramenter 
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         * @param queue, the IQueue to be planned
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         */
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        public FIFOTaskPlanner(IQueue queue) {
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                this.queue = queue;
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        }
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        public IRunnableTask nextTask() {
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                synchronized (this) {
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                        return (IRunnableTask) queue.getTasks().remove(0);
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                }
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        }
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        /**
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         * FIFO plans have no previous tasks so, null is always returned.
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         */
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        public IRunnableTask previousTask() {
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                return null;
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        }
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}