NotifierUtilities.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.pdd.core.handlers.notifier;

import java.util.List;

import org.openspcoop2.pdd.config.ClassNameProperties;
import org.openspcoop2.pdd.config.OpenSPCoop2Properties;
import org.openspcoop2.utils.io.notifier.NotifierInputStream;
import org.openspcoop2.utils.io.notifier.StreamingHandler;
import org.openspcoop2.utils.resources.Loader;
import org.openspcoop2.message.OpenSPCoop2Message;

/**
 * NotifierUtilities
 * 
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class NotifierUtilities {

    private static INotifierCallback notifierCallback = null;
    private static boolean notifierCallbackInitialized = false;
    private static synchronized void initNotifierCallback() throws Exception{
        if(notifierCallback==null){
            OpenSPCoop2Properties properties = OpenSPCoop2Properties.getInstance();
            if(properties.isNotifierInputStreamEnabled()) {
                String notifierInputStreamCallback = properties.getNotifierInputStreamCallback();
                ClassNameProperties classNameProperties = ClassNameProperties.getInstance();
                notifierCallback = (INotifierCallback) Loader.getInstance().newInstance(classNameProperties.getNotifierCallback(notifierInputStreamCallback));
            }
            notifierCallbackInitialized = true;
        }
    }
    private static INotifierCallback getNotifierCallback() throws Exception{
        if(notifierCallbackInitialized==false){
            initNotifierCallback();
        }
        return notifierCallback;
    }
    
    public static void updateNotifierState(OpenSPCoop2Message message, NotifierType notifierType, Object context) throws Exception{
        
        if(message!=null && message.getNotifierInputStream()!=null){
            
            NotifierInputStream nis = message.getNotifierInputStream();
            INotifierCallback notifierCallback = getNotifierCallback(); // viene inizializzato
            
            if(notifierCallback!=null){         
            
                // Notify
                NotifierResult notifierResult = notifierCallback.notify(notifierType, context);
                
                // Nuovi Streaming Handler (possono essere aggiunti in corsa solo se il buffer e' abilitato)
                if(nis.isBufferEnabled()){
                
                    List<StreamingHandler> streamingHandlers = notifierResult.getStreamingHandlers();
                    if(streamingHandlers!=null){
                        for (StreamingHandler streamingHandler : streamingHandlers) {
                            nis.addStreamingHandler(streamingHandler);
                        }
                    }
                    
                }
                                    
                // Situazione Buffer
                if(nis.isBufferEnabled()){
                        
                    NotifierBufferState nuovoStatoBuffer = notifierResult.getBufferState();
                    if(NotifierBufferState.DISABLE_AND_RELEASE_BUFFER_READED.equals(nuovoStatoBuffer)){
                        // puo' succedere che durante la callback, sia stato chiamata il serializeAndConsume. Questo rilascia anche il buffer. 
                        // E' quindi inutile rilasciarlo nuovamente.
                        if(nis.isBufferEnabled()){
                            nis.setOFFBuffering(true);
                        }
                    }
                    else if(NotifierBufferState.DISABLE.equals(nuovoStatoBuffer)){
                        // puo' succedere che durante la callback, sia stato chiamata il serializeAndConsume. Questo rilascia anche il buffer. 
                        // E' quindi inutile rilasciarlo nuovamente.
                        if(nis.isBufferEnabled()){
                            nis.setOFFBuffering(false);
                        }
                    }
                    
                }
            }
            
        }
        
    }
    
}