PluginLoader.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.monitor.engine.dynamic;

import org.openspcoop2.core.commons.CoreException;
import org.openspcoop2.core.plugins.constants.TipoPlugin;
import org.openspcoop2.utils.resources.Loader;
import org.slf4j.Logger;

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

    public static PluginLoader getInstance() {
        return (PluginLoader) CorePluginLoader.getInstance();
    }
    
    private PluginManager pluginManager = null;
    private Loader loader = null;
    private Logger log;
    
    public PluginLoader() {
        // nop
    }
    
    @Override
    public void init(Loader loader, Logger log) {
        this.loader = loader;
        this.log = log;
    }
    @Override
    public void init(Loader loader, Logger log, IRegistroPluginsReader registroPluginsReader, int expireSeconds) {
        init(loader, log);
        this.pluginManager = new PluginManager(registroPluginsReader, expireSeconds);
    }
    
    @Override
    public void close(Logger log) {
        if(this.pluginManager!=null) {
            try {
                this.pluginManager.close();
            }catch(Throwable t) {
                if(log!=null) {
                    log.error("PluginManager close failure: "+t.getMessage(),t);
                }
            }
        }
    }
    
    public boolean isPluginManagerEnabled() {
        return this.pluginManager!=null;
    }
    public void updateFromConsoleConfig(Logger log) throws Exception {
        this.pluginManager.updateFromConsoleConfig(log);
    }
    
    
    // UTILITY
    
    @Override
    public Class<?> getDynamicClass(String className, TipoPlugin tipoPlugin, String tipo) throws CoreException {
        return getDynamicClass(className, tipoPlugin.getValue(), tipo);
    }
    @Override
    public Class<?> getDynamicClass(String className, String tipoPlugin, String tipo) throws CoreException {
        if(className==null) {
            throw new CoreException("Class not found ("+getObjectName(tipoPlugin)+" type '"+tipo+"')");
        }
        Class<?> c = null;
        if(this.isPluginManagerEnabled()) {
            if(this.pluginManager==null) {
                throw new CoreException("Plugin manager not initialized");
            }
            try {
                c = this.pluginManager.findClass(this.log, tipoPlugin, className);
            }catch(Exception e) {
                throw new CoreException("Class '"+className+"' not found in registry ("+getObjectName(tipoPlugin)+" type '"+tipo+"'): "+e.getMessage(),e);
            }
        }
        else {
            try {
                c = Class.forName(className);
            }catch(Exception e) {
                throw new CoreException("Class '"+className+"' not found in classpath: "+e.getMessage(),e);
            }   
        }
        if(c==null) {
            throw new CoreException("Class '"+className+"' not found in registry ("+getObjectName(tipoPlugin)+" type '"+tipo+"')");
        }
        return c;
    }
    
    @Override
    public <T> T newInstance(Class<T> c, TipoPlugin tipoPlugin, String tipo) throws CoreException{
        return newInstance(c, tipoPlugin.getValue(), tipo);
    }
    @Override
    @SuppressWarnings("unchecked")
    public <T> T newInstance(Class<T> c, String tipoPlugin, String tipo) throws CoreException{
        try {
            return (T) this.loader.newInstance(c);
        }catch(Throwable e) {
            throw new CoreException("Class '"+c.getClass().getName()+"' new instance error ("+getObjectName(tipoPlugin)+" type '"+tipo+"'): "+e.getMessage(),e);
        }
    }
    
    @Override
    public Object newInstance(String customTipoClasse, String tipo) throws Exception {
        Class<?> c = getDynamicClass(null, customTipoClasse, tipo);
        return newInstance(c, customTipoClasse, tipo);
    }
    
    protected String getObjectName(String tipoPluginParam) throws CoreException {
        
        TipoPlugin tipoPlugin = TipoPlugin.toEnumConstant(tipoPluginParam);
        
        if(tipoPlugin==null) {
            return tipoPluginParam;
        }
        
        switch (tipoPlugin) {
        case CONNETTORE:
            return "connector";
        case AUTENTICAZIONE:
            return "authentication";
        case AUTORIZZAZIONE:
            return "authorization";
        case AUTORIZZAZIONE_CONTENUTI:
            return "authorization content";
        case INTEGRAZIONE:
            return "integration";
        case SERVICE_HANDLER:
            return "service handler";
        case MESSAGE_HANDLER:
            return "message handler";
        case BEHAVIOUR:
            return "behaviour";
        case RATE_LIMITING:
            return "policy rate limiting";
        case ALLARME:
            return "alarm";
        case TRANSAZIONE:
            return "transaction library";
        case RICERCA:
            return "search library";
        case STATISTICA:
            return "stats library";
        case TOKEN_DYNAMIC_DISCOVERY:
            return "token dynamic discovery";
        case TOKEN_VALIDAZIONE:
            return "token validation policy";
        case TOKEN_NEGOZIAZIONE:
            return "token retrieve policy";
        case ATTRIBUTE_AUTHORITY:
            return "attribute authority";
        }
        throw new CoreException("?? Type '"+tipoPlugin+"' unsupported ??");
    }
    
}