Source Code for Apache Log4j Core Implementation

Apache Log4j Core Implementation provides the functional components of the logging system. Users are free to create their own plugins and include them in the logging configuration. Apache Log4j Core is a required module to use Apache Log4j.

Bytecode (Java 8) for Apache Log4j Core Implementation is provided in a separate JAR file like log4j-core-2.14.1.jar.

Source Code files for Apache Log4j API are provided in both binary packge like and source package like You can download them at Apache Log4j Website.

You can also browse Source Code files for Apache Log4j Core Implementation 2.14.1 below.



 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache license, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the license for the specific language governing permissions and
 * limitations under the license.
package org.apache.logging.log4j.core.appender.rolling.action;

import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.Core;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.core.util.Clock;
import org.apache.logging.log4j.core.util.ClockFactory;
import org.apache.logging.log4j.status.StatusLogger;

 * PathCondition that accepts paths that are older than the specified duration.
@Plugin(name = "IfLastModified", category = Core.CATEGORY_NAME, printObject = true)
public final class IfLastModified implements PathCondition {
    private static final Logger LOGGER = StatusLogger.getLogger();
    private static final Clock CLOCK = ClockFactory.getClock();

    private final Duration age;
    private final PathCondition[] nestedConditions;

    private IfLastModified(final Duration age, final PathCondition[] nestedConditions) {
        this.age = Objects.requireNonNull(age, "age");
        this.nestedConditions = nestedConditions == null ? new PathCondition[0] : Arrays.copyOf(nestedConditions,

    public Duration getAge() {
        return age;

    public List<PathCondition> getNestedConditions() {
        return Collections.unmodifiableList(Arrays.asList(nestedConditions));

     * (non-Javadoc)
     * @see org.apache.logging.log4j.core.appender.rolling.action.PathCondition#accept(java.nio.file.Path,
     * java.nio.file.Path, java.nio.file.attribute.BasicFileAttributes)
    public boolean accept(final Path basePath, final Path relativePath, final BasicFileAttributes attrs) {
        final FileTime fileTime = attrs.lastModifiedTime();
        final long millis = fileTime.toMillis();
        final long ageMillis = CLOCK.currentTimeMillis() - millis;
        final boolean result = ageMillis >= age.toMillis();
        final String match = result ? ">=" : "<";
        final String accept = result ? "ACCEPTED" : "REJECTED";
        LOGGER.trace("IfLastModified {}: {} ageMillis '{}' {} '{}'", accept, relativePath, ageMillis, match, age);
        if (result) {
            return IfAll.accept(nestedConditions, basePath, relativePath, attrs);
        return result;

     * (non-Javadoc)
     * @see org.apache.logging.log4j.core.appender.rolling.action.PathCondition#beforeFileTreeWalk()
    public void beforeFileTreeWalk() {

     * Create an IfLastModified condition.
     * @param age The path age that is accepted by this condition. Must be a valid Duration.
     * @param nestedConditions nested conditions to evaluate if this condition accepts a path
     * @return An IfLastModified condition.
    public static IfLastModified createAgeCondition(
            // @formatter:off
            @PluginAttribute("age") final Duration age,
            @PluginElement("PathConditions") final PathCondition... nestedConditions) {
            // @formatter:on
        return new IfLastModified(age, nestedConditions);

    public String toString() {
        final String nested = nestedConditions.length == 0 ? "" : " AND " + Arrays.toString(nestedConditions);
        return "IfLastModified(age=" + age + nested + ")";



Or download all of them as a single archive file:

File name: log4j-core-2.14.1-sources.jar
File size: 1281358 bytes
Release date: 2021-03-06


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