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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;

import java.net.InetAddress;

import com.nesscomputing.syslog4j.SyslogRuntimeException;
import com.nesscomputing.syslog4j.impl.AbstractSyslog;
import com.nesscomputing.syslog4j.util.SyslogUtility;

/**
* AbstractNetSyslog is an abstract extension of AbstractSyslog
* that provides support for network-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: AbstractNetSyslog.java,v 1.7 2009/01/24 22:00:18 cvs Exp $
*/
public abstract class AbstractNetSyslog extends AbstractSyslog {
    protected static final Object cachedHostAddressSyncObject = new Object();

    private volatile InetAddress cachedHostAddress = null;

    protected AbstractNetSyslogConfigIF netSyslogConfig = null;

    protected void initialize() throws SyslogRuntimeException {
        try {
            this.netSyslogConfig = (AbstractNetSyslogConfigIF) this.syslogConfig;

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

    /**
     * @return Returns an object of InetAddress of the local host, using caching if so directed.
     */
    public InetAddress getHostAddress() {
        InetAddress hostAddress = null;

        if (this.netSyslogConfig.isCacheHostAddress()) {
            if (this.cachedHostAddress == null) {
                synchronized(cachedHostAddressSyncObject) {
                    if (this.cachedHostAddress == null) {
                        this.cachedHostAddress = SyslogUtility.getInetAddress(this.syslogConfig.getHost());
                    }
                }
            }

            hostAddress = this.cachedHostAddress;

        } else {
            hostAddress = SyslogUtility.getInetAddress(this.syslogConfig.getHost());
        }

        return hostAddress;
    }
}