QueueManager.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it). 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */


package org.openspcoop2.web.ctrlstat.core;

import java.util.Properties;

import javax.jms.Queue;
import javax.jms.QueueConnectionFactory;
import javax.naming.NamingException;

import org.openspcoop2.pdd.config.OpenSPCoop2ConfigurationException;
import org.openspcoop2.utils.UtilsException;
import org.openspcoop2.utils.resources.GestoreJNDI;
import org.openspcoop2.web.lib.queue.config.QueueProperties;

/**
 * QueueManager
 * 
 * @author Andrea Poli (apoli@link.it)
 * @author Stefano Corallo (corallo@link.it)
 * @author Sandra Giangrandi (sandra@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 * 
 */
public class QueueManager {

    private static QueueManager manager;
    private static String cfName;
    private static Properties cfProp;

    private QueueConnectionFactory qcf;
    private GestoreJNDI jndi;

    private QueueManager() {
        try {
            // leggo parametri dal file properties
            QueueManager.readQueueProperties();
            // Inizializzo il gestorejndi
            this.jndi = new GestoreJNDI(QueueManager.cfProp);

        } catch (Exception e) {
            // ignore
        }
    }

    private static synchronized void init() {
        if (QueueManager.manager == null) {
            QueueManager.manager = new QueueManager();
        }
    }
    public static QueueManager getInstance() {
        if (QueueManager.manager == null) {
            // spotbugs warning 'SING_SINGLETON_GETTER_NOT_SYNCHRONIZED': l'istanza viene creata allo startup
            synchronized (QueueManager.class) {
                init();
            }
        }

        return QueueManager.manager;
    }

    public Queue getQueue(String queueName) throws UtilsException {
        return (Queue) this.jndi.lookup(queueName);
    }

    public QueueConnectionFactory getQueueConnectionFactory() throws NamingException {
        // istanzio connection factory
        try {
            this.qcf = (QueueConnectionFactory) this.jndi.lookup(QueueManager.cfName);
        } catch (Exception e) {
            // ignore
        }
        if (this.qcf == null) {
            throw new NamingException("ConnectionFactory non inizializzata.");
        }

        return this.qcf;
    }

    private static void readQueueProperties() throws UtilsException, OpenSPCoop2ConfigurationException {

        QueueProperties queueProperties = QueueProperties.getInstance();
        
        QueueManager.cfName = queueProperties.getConnectionFactory();
        
        QueueManager.cfProp = queueProperties.getConnectionFactoryContext();

    }

}