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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.encoder;

import ch.qos.logback.core.spi.ContextAware;
import ch.qos.logback.core.spi.LifeCycle;

/**
 * Encoders are responsible for transform an incoming event into a byte array
 * 
 * @author Ceki Gülcü
 * @author Joern Huxhorn
 * @author Maarten Bosteels
 * 
 * @param 
 *          event type
 * @since 0.9.19
 */
public interface Encoder extends ContextAware, LifeCycle {

    /**
     * Get header bytes. This method is typically called upon opening of 
     * an output stream.
     * 
     * @return header bytes. Null values are allowed.
     */
    byte[] headerBytes();

    /**
     * Encode an event as bytes.
     *  
     * @param event
     */
    byte[] encode(E event);
                    
    /**
     * Get footer bytes. This method is typically called prior to the closing 
     * of the stream where events are written.
     * 
     * @return footer bytes. Null values are allowed.
     */
    byte[] footerBytes();
}