ProcessOutputStream.java

/**
 * Copyright (C) 2008-2010, Squale Project - http://www.squale.org
 *
 * This file is part of Squale.
 *
 * Squale 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 3 of the
 * License, or any later version.
 *
 * Squale 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 Lesser General Public License
 * along with Squale.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.squale.squalix.util.process;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Traitement du flux stdout des processus Le flux stdout est trait� dans un thread pour �viter les deadlocks
 */
class ProcessOutputStream
    implements Runnable
{
    /**
     * Logger.
     */
    private static final Log LOGGER = LogFactory.getLog( ProcessOutputStream.class );;

    /** Handler poour l'output */
    protected ProcessOutputHandler mOutputHandler;

    /**
     * Buffer de sortie du shell (<code>stdout</code>).
     */
    protected BufferedReader mBr;

    /**
     * Constructeur.
     * 
     * @param pStream flux de sortie (<code>stdout</code>).
     * @param pOutputHandler handler de sortie
     */
    public ProcessOutputStream( InputStream pStream, ProcessOutputHandler pOutputHandler )
    {
        mBr = new BufferedReader( new InputStreamReader( pStream ) );
        mOutputHandler = pOutputHandler;
    }

    /**
     * M�thode de lancement du thread.
     */
    public void run()
    {
        String inputMessage;
        try
        {
            /* on lit une � une les lignes du flux */
            while ( null != ( inputMessage = mBr.readLine() ) )
            {
                LOGGER.info( inputMessage );
                // Passage de la ligne au handler d'output si besoin
                if ( mOutputHandler != null )
                {
                    mOutputHandler.processOutput( inputMessage );
                }
            }
            // Fermeture du flux pour �viter un deadlock
            // avec le process externe
            mBr.close();
        }
        catch ( IOException e )
        {
            // Cas peu probable car on lit stdout d'un process
            // externe
            LOGGER.error( e, e );
        }
    }
}