001/**
002 * Logback: the reliable, generic, fast and flexible logging framework.
003 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
004 *
005 * This program and the accompanying materials are dual-licensed under
006 * either the terms of the Eclipse Public License v1.0 as published by
007 * the Eclipse Foundation
008 *
009 *   or (per the licensee's choosing)
010 *
011 * under the terms of the GNU Lesser General Public License version 2.1
012 * as published by the Free Software Foundation.
013 */
014package ch.qos.logback.core.spi;
015
016import ch.qos.logback.core.helpers.CyclicBuffer;
017
018import java.util.*;
019
020/**
021 * CyclicBufferTracker tracks  {@link CyclicBuffer} instances.
022 *
023 * @author Ceki Gülcü
024 */
025public class CyclicBufferTracker<E> extends AbstractComponentTracker<CyclicBuffer<E>> {
026
027    static final int DEFAULT_NUMBER_OF_BUFFERS = 64;
028
029    static final int DEFAULT_BUFFER_SIZE = 256;
030    int bufferSize = DEFAULT_BUFFER_SIZE;
031
032    public CyclicBufferTracker() {
033        super();
034        setMaxComponents(DEFAULT_NUMBER_OF_BUFFERS);
035    }
036
037    public int getBufferSize() {
038        return bufferSize;
039    }
040
041    public void setBufferSize(int bufferSize) {
042        this.bufferSize = bufferSize;
043    }
044
045    @Override
046    protected void processPriorToRemoval(CyclicBuffer<E> component) {
047        component.clear();
048    }
049
050    @Override
051    protected CyclicBuffer<E> buildComponent(String key) {
052        return new CyclicBuffer<E>(bufferSize);
053    }
054
055    @Override
056    protected boolean isComponentStale(CyclicBuffer<E> eCyclicBuffer) {
057        return false;
058    }
059
060    // for testing purposes
061    List<String> liveKeysAsOrderedList() {
062        return new ArrayList<String>(liveMap.keySet());
063    }
064
065    List<String> lingererKeysAsOrderedList() {
066        return new ArrayList<String>(lingerersMap.keySet());
067
068    }
069
070}