Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.remoteclient.taskplanning;

/**

 * <p>

 * ITaskPlanner provides an interface to program your own task planning. It gives

 * you operations for pick a task from the queue according on the criteria that

 * you designed.<br>

 * </p>

 * <p>

 * The simplest implementation of ITaskPlanner would be a FIFO task planner (see

 * FIFOTaskPlanner.java) which takes jobs from a task queue in the same order

 * they were put. But any kind of planner is possible (SJF, LIFO, RoundRobin, etc.). 

 * </p>

 * @author jaume dominguez faus - jaume.dominguez@iver.es

 *

 */

public interface ITaskPlanner {

        /**

         * Takes the next task to be executed.

         * @return IRunnableTask representing the next task to be executed

         */

        public IRunnableTask nextTask();

        /**

         * Takes the previous executed task. Notice that it may or may not have

         * sense for specific implementations. For example, in a FIFO-like planner,

         * the task is taken from the queue, executed until it is finished and 

         * removed from the queue. So, there is no previous task.

         * 

         * @return IRunnableTask representing the previous executed task, or null

         * if none.

         * @deprecated (probably this is unuseful and i'll remove it)

         */

        public IRunnableTask previousTask();

}