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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.udp;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;

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

/**
* UDPNetSyslog is an extension of AbstractSyslog that provides support for
* UDP/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: UDPNetSyslog.java,v 1.18 2010/10/27 06:18:10 cvs Exp $
*/
public class UDPNetSyslog extends AbstractNetSyslog {
    protected DatagramSocket socket = null;

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

        createDatagramSocket(true);
    }

    protected synchronized void createDatagramSocket(boolean initialize) {
        try {
            this.socket = new DatagramSocket();

        } catch (SocketException se) {
            if (initialize) {
                if (this.syslogConfig.isThrowExceptionOnInitialize()) {
                    throw new SyslogRuntimeException(se);
                }

            } else {
                throw new SyslogRuntimeException(se);
            }
        }

        if (this.socket == null) {
            throw new SyslogRuntimeException("Cannot seem to get a Datagram socket");
        }
    }

    protected void write(SyslogLevel level, byte[] message) throws SyslogRuntimeException {
        if (this.socket == null) {
               createDatagramSocket(false);
        }

        InetAddress hostAddress = getHostAddress();

        DatagramPacket packet = new DatagramPacket(
            message,
            message.length,
            hostAddress,
            this.syslogConfig.getPort()
        );

        int attempts = 0;

        while(attempts != -1 && attempts < (this.netSyslogConfig.getWriteRetries() + 1)) {
            try {
                this.socket.send(packet);
                attempts = -1;

            } catch (IOException ioe) {
                if (attempts == (this.netSyslogConfig.getWriteRetries() + 1)) {
                    throw new SyslogRuntimeException(ioe);
                }
            }
        }
    }

    public void flush() throws SyslogRuntimeException {
        shutdown();

        createDatagramSocket(true);
    }

    public void shutdown() throws SyslogRuntimeException {
        if (this.socket != null) {
            this.socket.close();
            this.socket = null;
        }
    }

    public AbstractSyslogWriter getWriter() {
        return null;
    }

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