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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.message.modifier.sequential;

import com.nesscomputing.syslog4j.SyslogFacility;
import com.nesscomputing.syslog4j.SyslogIF;
import com.nesscomputing.syslog4j.SyslogLevel;
import com.nesscomputing.syslog4j.SyslogMessageModifierIF;
/**
* SequentialSyslogMessageModifier is an implementation of SyslogMessageModifierIF
* that adds an incremented number at the end.
*
* 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: SequentialSyslogMessageModifier.java,v 1.8 2010/11/28 04:43:31 cvs Exp $
*/
public class SequentialSyslogMessageModifier implements SyslogMessageModifierIF {
    protected SequentialSyslogMessageModifierConfig config = null;

    protected long currentSequence[] = new long[SyslogLevel.values().length];

    public static final SequentialSyslogMessageModifier createDefault() {
        SequentialSyslogMessageModifier modifier = new SequentialSyslogMessageModifier(SequentialSyslogMessageModifierConfig.createDefault());

        return modifier;
    }

    public SequentialSyslogMessageModifier(SequentialSyslogMessageModifierConfig config) {
        this.config = config;

        for(int i=0; i= this.config.getFirstNumber() && nextSequence < this.config.getLastNumber()) {
            synchronized(this) {
                this.currentSequence[level.getValue()] = nextSequence;
            }
        }
    }

    protected String nextSequence(SyslogLevel syslogLevel) {
        long sequence = -1;
        final int level = syslogLevel.getValue();

        synchronized(this) {
            sequence = this.currentSequence[level];

            if (this.currentSequence[level] >= this.config.getLastNumber()) {
                this.currentSequence[level] = this.config.getFirstNumber();

            } else {
                this.currentSequence[level]++;
            }
        }

        String _sequence = null;

        if (this.config.isUsePadding()) {
            _sequence = pad(sequence);

        } else {
            _sequence = Long.toString(sequence);
        }

        return _sequence;
    }

    public SequentialSyslogMessageModifierConfig getConfig() {
        return this.config;
    }

    @Override
    public String modify(SyslogIF syslog, SyslogFacility facility, SyslogLevel level, String message) {
        StringBuffer buffer = new StringBuffer(message);

        buffer.append(this.config.getPrefix());
        buffer.append(nextSequence(level));
        buffer.append(this.config.getSuffix());

        return buffer.toString();
    }

    public boolean verify(String message) {
        // NO-OP

        return true;
    }
}