SizeAndTimeBasedRollingPolicy.java

/*
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2026, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v2.0 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.rolling;

import ch.qos.logback.core.rolling.SizeAndTimeBasedFileNamingAndTriggeringPolicy.Usage;
import ch.qos.logback.core.util.FileSize;

public class SizeAndTimeBasedRollingPolicy<E> extends TimeBasedRollingPolicy<E> {

    static long MAX_COMPRESSION_FACTOR = 20;

    FileSize maxFileSize;

    @Override
    public void start() {
        SizeAndTimeBasedFileNamingAndTriggeringPolicy<E> sizeAndTimeBasedFNATP = new SizeAndTimeBasedFileNamingAndTriggeringPolicy<E>(Usage.EMBEDDED);
        if (maxFileSize == null) {
            addError("maxFileSize property is mandatory.");
            return;
        } else {
            addInfo("Archive files will be limited to [" + maxFileSize + "] each.");
        }

        sizeAndTimeBasedFNATP.setMaxFileSize(maxFileSize);
        timeBasedFileNamingAndTriggeringPolicy = sizeAndTimeBasedFNATP;

        if (!isUnboundedTotalSizeCap() && totalSizeCap.getSize() < maxFileSize.getSize()/MAX_COMPRESSION_FACTOR) {
            addWarn("totalSizeCap of [" + totalSizeCap + "] is much smaller than maxFileSize [" + maxFileSize
                    + "] which is non-sensical, even taking compression into account.");
        }

        // most work is done by the parent
        super.start();
    }

    public void setMaxFileSize(FileSize aMaxFileSize) {
        this.maxFileSize = aMaxFileSize;
    }

    @Override
    public String toString() {
        return "c.q.l.core.rolling.SizeAndTimeBasedRollingPolicy@" + this.hashCode();
    }
}