org.jactr.tools.tracer.sinks.FileSink.java Source code

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Here is the source code for org.jactr.tools.tracer.sinks.FileSink.java

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/*
 * Created on Feb 22, 2007 Copyright (C) 2001-6, Anthony Harrison anh23@pitt.edu
 * (jactr.org) 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
 */
package org.jactr.tools.tracer.sinks;

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.ListIterator;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jactr.tools.tracer.ITraceSink;
import org.jactr.tools.tracer.transformer.ITransformedEvent;

/**
 * @author developer
 */
public class FileSink implements ITraceSink {
    /**
     * logger definition
     */
    static private final Log LOGGER = LogFactory.getLog(FileSink.class);

    private ArrayList<ITransformedEvent> _queue;

    private ObjectOutputStream _outputStream;

    public FileSink(URL file) throws IOException {
        _queue = new ArrayList<ITransformedEvent>();
        _outputStream = new ObjectOutputStream(new BufferedOutputStream(file.openConnection().getOutputStream()));
    }

    @Override
    public void finalize() throws Throwable {
        _outputStream.close();
    }

    /**
     * @see org.jactr.tools.tracer.ITraceSink#add(org.jactr.tools.tracer.transformer.ITransformedEvent)
     */
    public void add(ITransformedEvent event) {
        if (event == null) {
            LOGGER.error("null message received ", new NullPointerException());
            return;
        }
        synchronized (_queue) {
            _queue.add(event);
        }
    }

    public void flush() throws Exception {
        synchronized (_queue) {
            ListIterator<ITransformedEvent> itr = _queue.listIterator();
            while (itr.hasNext()) {
                _outputStream.writeObject(itr.next());
                itr.remove();
            }
        }
        _outputStream.flush();
    }

    public boolean isOpen() {
        return _outputStream != null;
    }
}