org.deegree.maven.PortnumberMojo.java Source code

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Here is the source code for org.deegree.maven.PortnumberMojo.java

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//$HeadURL$
/*----------------------------------------------------------------------------
 This file is part of deegree, http://deegree.org/
 Copyright (C) 2001-2010 by:
 - Department of Geography, University of Bonn -
 and
 - lat/lon GmbH -
    
 This library is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser General Public License as published by the Free
 Software Foundation; either version 2.1 of the License, or (at your option)
 any later version.
 This library 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 Lesser General Public License for more
 details.
 You should have received a copy of the GNU Lesser General Public License
 along with this library; if not, write to the Free Software Foundation, Inc.,
 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    
 Contact information:
    
 lat/lon GmbH
 Aennchenstr. 19, 53177 Bonn
 Germany
 http://lat-lon.de/
    
 Department of Geography, University of Bonn
 Prof. Dr. Klaus Greve
 Postfach 1147, 53001 Bonn
 Germany
 http://www.geographie.uni-bonn.de/deegree/
    
 e-mail: info@deegree.org
 ----------------------------------------------------------------------------*/
package org.deegree.maven;

import static org.apache.commons.io.IOUtils.closeQuietly;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.nio.channels.FileLock;

import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.project.MavenProject;

/**
 * @goal generate-portnumber
 * @phase initialize
 * 
 * @author <a href="mailto:schmitz@lat-lon.de">Andreas Schmitz</a>
 * @author last edited by: $Author$
 * 
 * @version $Revision$, $Date$
 */
public class PortnumberMojo extends AbstractMojo {

    /**
     * @parameter default-value="${project}"
     * @required
     * @readonly
     */
    private MavenProject project;

    @Override
    public void execute() throws MojoExecutionException, MojoFailureException {
        PrintStream out = null;
        BufferedReader reader = null;
        FileLock lock = null;
        FileInputStream fis = null;
        try {
            File portfile = new File(System.getProperty("java.io.tmpdir") + "/portnumbers");
            int port = 1025;
            if (portfile.exists()) {
                fis = new FileInputStream(portfile);
                reader = new BufferedReader(new InputStreamReader(fis, "UTF-8"));

                boolean read = false;
                while (!read) {
                    try {
                        port = Integer.parseInt(reader.readLine()) + 1;
                        read = true;
                    } catch (NumberFormatException e) {
                        // someone is currently writing
                        try {
                            Thread.sleep(100);
                        } catch (InterruptedException e1) {
                            return;
                        } finally {
                            closeQuietly(out);
                            closeQuietly(reader);
                            closeQuietly(fis);
                        }
                    }
                }
                reader.close();
            }
            if (port > 18000) {
                port = 1025;
            }

            getLog().info("Using portnumber " + port + " for this run.");

            project.getProperties().put("portnumber", "" + port);

            FileOutputStream fos = new FileOutputStream(portfile);
            out = new PrintStream(fos, true, "UTF-8");
            while ((lock = fos.getChannel().tryLock()) == null) {
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    return;
                }
            }
            out.println("" + port);
            lock.release();
            out.close();
        } catch (Throwable e) {
            getLog().error(e);
        } finally {
            closeQuietly(out);
            closeQuietly(reader);
            closeQuietly(fis);
        }
    }
}