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Syslog4j provides client and server implementations of the BSD Syslog protocol (RFC 3164) and the structured syslog" protocol (RFC5424).

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/**
 *
 * (C) Copyright 2008-2011 syslog4j.org
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public License
 * (LGPL) version 2.1 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl-2.1.html
 *
 * 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.
 */
package com.nesscomputing.syslog4j.impl.net.tcp;

import com.nesscomputing.syslog4j.SyslogLevel;
import com.nesscomputing.syslog4j.SyslogRuntimeException;
import com.nesscomputing.syslog4j.impl.AbstractSyslogWriter;
import com.nesscomputing.syslog4j.impl.net.AbstractNetSyslog;

/**
* TCPNetSyslog is an extension of AbstractSyslog that provides support for
* TCP/IP-based syslog clients.
*
* Syslog4j is licensed under the Lesser GNU Public License v2.1.  A copy
* of the LGPL license is available in the META-INF folder in all
* distributions of Syslog4j and in the base directory of the "doc" ZIP.
*
* @author <[email protected]>
* @version $Id: TCPNetSyslog.java,v 1.21 2010/11/28 04:43:31 cvs Exp $
*/
public class TCPNetSyslog extends AbstractNetSyslog {
    protected TCPNetSyslogWriter writer = null;

    protected TCPNetSyslogConfigIF tcpNetSyslogConfig = null;

    public void initialize() throws SyslogRuntimeException {
        super.initialize();

        try {
            this.tcpNetSyslogConfig = (TCPNetSyslogConfigIF) this.syslogConfig;

        } catch (ClassCastException cce) {
            throw new SyslogRuntimeException("config must implement interface TCPNetSyslogConfigIF");
        }
    }

    public AbstractSyslogWriter getWriter() {
        return getWriter(true);
    }

    public synchronized AbstractSyslogWriter getWriter(boolean create) {
        if (this.writer != null || !create) {
            return this.writer;
        }

        this.writer = (TCPNetSyslogWriter) createWriter();

        if (this.tcpNetSyslogConfig.isThreaded()) {
            createWriterThread(this.writer);
        }

        return this.writer;
    }

    protected void write(SyslogLevel level, byte[] message) throws SyslogRuntimeException {
        AbstractSyslogWriter syslogWriter = getWriter();

        try {
            if (syslogWriter.hasThread()) {
                syslogWriter.queue(level,message);

            } else {
                synchronized(syslogWriter) {
                    syslogWriter.write(message);
                }
            }

        } finally {
            returnWriter(syslogWriter);
        }
    }

    public void flush() throws SyslogRuntimeException {
        AbstractSyslogWriter syslogWriter = getWriter(false);

        if (syslogWriter != null) {
            syslogWriter.flush();
        }
    }

    public void shutdown() throws SyslogRuntimeException {
        AbstractSyslogWriter syslogWriter = getWriter(false);

        if (syslogWriter != null) {
            syslogWriter.shutdown();
        }
    }

    public void returnWriter(AbstractSyslogWriter syslogWriter) {
        //
    }
}