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.
/**
 * 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.read;

import ch.qos.logback.core.AppenderBase;
import ch.qos.logback.core.helpers.CyclicBuffer;

CyclicBufferAppender stores events in a cyclic buffer of user-specified size. As the 
name suggests, if the size of the buffer is N, only the latest N events are available.
Author:
Ceki Gulcu/**
 * CyclicBufferAppender stores events in a cyclic buffer of user-specified size. As the 
 * name suggests, if the size of the buffer is N, only the latest N events are available.
 * 
 * 
 * @author Ceki Gulcu
 */
public class CyclicBufferAppender<E> extends AppenderBase<E> {

    CyclicBuffer<E> cb;
    int maxSize = 512;

    public void start() {
        cb = new CyclicBuffer<E>(maxSize);
        super.start();
    }

    public void stop() {
        cb = null;
        super.stop();
    }

    @Override
    protected void append(E eventObject) {
        if (!isStarted()) {
            return;
        }
        cb.add(eventObject);
    }

    public int getLength() {
        if (isStarted()) {
            return cb.length();
        } else {
            return 0;
        }
    }

    public E get(int i) {
        if (isStarted()) {
            return cb.get(i);
        } else {
            return null;
        }
    }

    public void reset() {
        cb.clear();
    }

    
Set the size of the cyclic buffer.
/**
     * Set the size of the cyclic buffer.
     */
    public int getMaxSize() {
        return maxSize;
    }

    public void setMaxSize(int maxSize) {
        this.maxSize = maxSize;
    }

}