de.thischwa.pmcms.model.thread.LogGrabber.java Source code

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Here is the source code for de.thischwa.pmcms.model.thread.LogGrabber.java

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/*******************************************************************************
 * Poor Man's CMS (pmcms) - A very basic CMS generating static html pages.
 * http://poormans.sourceforge.net
 * Copyright (C) 2004-2013 by Thilo Schwarz
 * 
 * == BEGIN LICENSE ==
 * 
 * Licensed under the terms of any of the following licenses at your
 * choice:
 * 
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 * 
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 * 
 * == END LICENSE ==
 ******************************************************************************/
package de.thischwa.pmcms.model.thread;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

import org.apache.commons.io.IOUtils;
import org.apache.log4j.Logger;

import de.thischwa.pmcms.gui.ILogAppender;

/**
 * Grab the log for the gui.
 * 
 * @author Thilo Schwarz
 */
public class LogGrabber extends Thread {
    private static Logger logger = Logger.getLogger(LogGrabber.class);
    private String logFileName = null;
    private ILogAppender logAppender = null;

    public LogGrabber(final String logFileName, final ILogAppender logAppender) {
        setName("Thread-LogGrabber");
        this.logFileName = logFileName;
        this.logAppender = logAppender;
    }

    /* (non-Javadoc)
     * @see java.lang.Runnable#run()
     */
    @Override
    public void run() {
        BufferedReader reader = null;
        final File logFile = new File(logFileName);
        try {
            reader = new BufferedReader(new FileReader(logFile));
            reader.skip(logFile.length());
        } catch (FileNotFoundException e1) {
            logger.warn("Log file not found. End file logging.");
            interrupt();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        // Main loop.
        while (!isInterrupted()) {
            String line;
            try {
                if (reader != null) {
                    line = reader.readLine();
                    while (line != null && !logAppender.getDisplay().isDisposed()) {
                        final String tmp = line;
                        logAppender.getDisplay().syncExec(new Runnable() {
                            @Override
                            public void run() {
                                logAppender.appendToLog(tmp);
                                logAppender.appendToLog("\n");
                            }
                        });
                        line = reader.readLine();
                    }
                }
            } catch (IOException e1) {
                logger.error("While logging: " + e1.getMessage(), e1);
                interrupt();
            }
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                logger.debug("Thread interrupted.");
                interrupt();
            }
        }

        IOUtils.closeQuietly(reader);
    }

}