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.

 */

/*

 * Created on 01-oct-2005

 */

package org.gvsig.remoteclient.taskplanning.retrieving;

import java.util.Date;

import java.util.Vector;

import org.gvsig.remoteclient.taskplanning.FIFOTaskPlanner;

import org.gvsig.remoteclient.taskplanning.IQueue;

import org.gvsig.remoteclient.taskplanning.IRunnableTask;

import org.gvsig.remoteclient.taskplanning.ITaskPlanner;

/**

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

 *                    Luis W. Sevilla (sevilla_lui@gva.es)

 */

public class RetrieveQueue implements IQueue {

        private String hostName;

        private Date startTime;

        private Vector tasks = new Vector();

        private boolean waiting;

        private ITaskPlanner taskPlanner;

        private Worker worker;

        /**

         * 

         */

        public RetrieveQueue(String hName) {

                hostName = hName;

                startTime = new Date();

                worker = new Worker();

                new Thread(worker).start();

        }

        public IRunnableTask put(IRunnableTask task) {

                tasks.add(task);

                if (waiting) {

                        synchronized (this) {

                                notifyAll();

                        }

                }

                return task;

        }

        public IRunnableTask take() {

                if (tasks.isEmpty()) {

                        synchronized (this) {

                                waiting = true;

                                try {

                                        wait();

                                } catch (InterruptedException ie) {

                                        waiting = false;

                                }

                        }

                }

                return getTaskPlanner().nextTask() ;

        }

        public boolean isEmpty() {

                synchronized (this) {

                        return tasks.isEmpty() && !worker.r.isRunning();

                }

        }

        public ITaskPlanner getTaskPlanner() {

                if (taskPlanner == null) {

                        taskPlanner = new FIFOTaskPlanner(this);

                }

                return taskPlanner;

        }

        public void setTaskPlanner(ITaskPlanner planner) {

                taskPlanner = planner;

        }

        public void pause() {

                waiting = true;

        }

        public void resume() {

                waiting = false;

        }

        public Vector getTasks() {

                return tasks;

        }

        private class Worker implements Runnable {

                URLRetrieveTask r;

                int i = 0; 

                public void run() {

                        while (true) {

                                r = (URLRetrieveTask) take();

                                r.execute();

                        }

                }

        }

        protected URLRetrieveTask getURLPreviousRequest(URLRequest request) {

                // Is the one currently running?

                /*URLRetrieveTask aux = (URLRetrieveTask) worker.r;

                if (request.equals(aux.getRequest())) {

                                return aux;

                }*/        

                // Is one of those in the queue?

                for (int i = 0; i < tasks.size(); i++) {

                        URLRetrieveTask task = (URLRetrieveTask) tasks.get(i);

                        URLRequest aWorkingRequest = task.getRequest();

                        if (aWorkingRequest.equals(request)) {

                                return task;

                        }

                }

                return null;

        }

}