Syslog4jBackLogHandler.java

package org.graylog2.syslog4j.impl.backlog;

import org.graylog2.syslog4j.Syslog;
import org.graylog2.syslog4j.SyslogConstants;
import org.graylog2.syslog4j.SyslogIF;
import org.graylog2.syslog4j.SyslogRuntimeException;

/**
 * Syslog4jBackLogHandler is used to send Syslog backLog messages to
 * another Syslog4j protocol whenever the main Syslog protocol fails.
 * <p/>
 * <p>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.</p>
 *
 * @author <syslog4j@productivity.org>
 * @version $Id: Syslog4jBackLogHandler.java,v 1.1 2009/07/25 18:42:47 cvs Exp $
 */
public class Syslog4jBackLogHandler extends AbstractSyslogBackLogHandler {
    protected SyslogIF syslog = null;
    protected int downLevel = SyslogConstants.LEVEL_WARN;
    protected int upLevel = SyslogConstants.LEVEL_WARN;

    public Syslog4jBackLogHandler(String protocol) {
        this.syslog = Syslog.getInstance(protocol);
    }

    public Syslog4jBackLogHandler(String protocol, boolean appendReason) {
        this.syslog = Syslog.getInstance(protocol);
        this.appendReason = appendReason;
    }

    public Syslog4jBackLogHandler(SyslogIF syslog) {
        this.syslog = syslog;
    }

    public Syslog4jBackLogHandler(SyslogIF syslog, boolean appendReason) {
        this.syslog = syslog;
        this.appendReason = appendReason;
    }

    public void initialize() throws SyslogRuntimeException {
        // NO-OP
    }

    public void log(SyslogIF syslog, int level, String message, String reason) throws SyslogRuntimeException {
        if (this.syslog.getProtocol().equals(syslog.getProtocol())) {
            throw new SyslogRuntimeException("Ignoring this log entry since the backLog protocol \"" + this.syslog.getProtocol() + "\" is the same as the main protocol");
        }

        String combinedMessage = combine(syslog, level, message, reason);

        this.syslog.log(level, combinedMessage);
    }

    public void down(SyslogIF syslog, String reason) {
        if (!this.syslog.getProtocol().equals(syslog.getProtocol())) {
            this.syslog.log(this.downLevel, "Syslog protocol \"" + syslog.getProtocol() + "\" is down: " + reason);
        }
    }

    public void up(SyslogIF syslog) {
        if (!this.syslog.getProtocol().equals(syslog.getProtocol())) {
            this.syslog.log(this.downLevel, "Syslog protocol \"" + syslog.getProtocol() + "\" is up");
        }
    }
}