org.graylog2.syslog4j.impl.net.AbstractNetSyslog Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of syslog4j Show documentation

Syslog4j provides client and server implementations of the BSD Syslog protocol (RFC 3164) and the draft "structured syslog" protocol (RFC Draft). This is a repackaged fork used in Graylog2, as the original package has no recent versions published to Maven Central.

There is a newer version: 0.9.61

Show newest version

package org.graylog2.syslog4j.impl.net;

import java.net.InetAddress;

import org.graylog2.syslog4j.SyslogRuntimeException;
import org.graylog2.syslog4j.impl.AbstractSyslog;
import org.graylog2.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 {
    private static final long serialVersionUID = -3250858945515853967L;

    protected static final Object cachedHostAddressSyncObject = new Object();

    protected 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;
    }
}