001/*
002 * jPOS Project [http://jpos.org]
003 * Copyright (C) 2000-2026 jPOS Software SRL
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jpos.q2.qbean;
020
021import org.jdom2.Element;
022import org.jpos.core.ConfigurationException;
023import org.jpos.q2.QBeanSupport;
024import org.jpos.q2.QFactory;
025import org.jpos.util.*;
026
027import java.io.IOException;
028import java.io.PrintStream;
029
030/**
031 * QBean that materialises a named {@link Logger} from its persist element,
032 * optionally redirecting {@code System.out}/{@code System.err} to it.
033 */
034public class LoggerAdaptor extends QBeanSupport {
035    /** Default constructor; no instance state to initialise. */
036    public LoggerAdaptor() {}
037    private Logger logger;
038    private PrintStream originalOut = null;
039    private PrintStream originalErr = null;
040
041    protected void initService () {
042        logger = Logger.getLogger (getName());
043    }
044    protected void startService () throws ConfigurationException, IOException {
045        logger.removeAllListeners ();
046        for (Element lle : getPersist().getChildren("log-listener"))
047            addListener(lle);
048
049        String redirect = cfg.get("redirect");
050        long delay = cfg.getLong("delay", 500);
051
052        if (redirect.contains("stdout")) {
053            originalOut = System.out;
054            System.setOut(new PrintStream(new LogEventOutputStream(logger, "stdout", delay)));
055        }
056        if (redirect.contains("stderr")) {
057            originalErr = System.err;
058            System.setErr(new PrintStream(new LogEventOutputStream(logger, "stderr", delay)));
059        }
060    }
061    protected void stopService() {
062        if (originalOut != null)
063            System.setOut(originalOut);
064        if (originalErr != null)
065            System.setErr(originalErr);
066        logger.removeAllListeners ();
067    }
068    protected void destroyService() {
069        // we don't destroy (that would unregister the logger from the
070        // NameRegistrar) because other components might have references
071        // to this logger.
072        //
073        // logger.destroy ();
074    }
075
076    private void addListener (Element e) throws ConfigurationException {
077        QFactory factory = getServer().getFactory();
078        LogListener listener = factory.newInstance(e);
079        if (listener != null) {
080            attemptToAddWriter(e.getChild("writer"), listener);
081            logger.addListener(listener);
082        }
083    }
084
085    private void attemptToAddWriter (Element e, LogListener listener) throws ConfigurationException {
086        if (e != null) {
087            QFactory factory = getServer().getFactory();
088            if (QFactory.isEnabled(e)) {
089                String clazz = e.getAttributeValue("class");
090                LogEventWriter writer = factory.newInstance(clazz);
091                factory.setConfiguration(writer, e);
092                listener.setLogEventWriter (writer);
093            }
094        }
095    }
096}