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.FileVisitOption;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;

import org.apache.logging.log4j.core.lookup.StrSubstitutor;

 * Abstract action for processing files that are accepted by the specified PathFilters.
public abstract class AbstractPathAction extends AbstractAction {

    private final String basePathString;
    private final Set<FileVisitOption> options;
    private final int maxDepth;
    private final List<PathCondition> pathConditions;
    private final StrSubstitutor subst;

     * Creates a new AbstractPathAction that starts scanning for files to process from the specified base path.
     * @param basePath base path from where to start scanning for files to process.
     * @param followSymbolicLinks whether to follow symbolic links. Default is false.
     * @param maxDepth The maxDepth parameter is the maximum number of levels of directories to visit. A value of 0
     *            means that only the starting file is visited, unless denied by the security manager. A value of
     *            MAX_VALUE may be used to indicate that all levels should be visited.
     * @param pathFilters an array of path filters (if more than one, they all need to accept a path before it is
     *            processed).
    protected AbstractPathAction(final String basePath, final boolean followSymbolicLinks, final int maxDepth,
            final PathCondition[] pathFilters, final StrSubstitutor subst) {
        this.basePathString = basePath;
        this.options = followSymbolicLinks ? EnumSet.of(FileVisitOption.FOLLOW_LINKS)
                : Collections.<FileVisitOption> emptySet();
        this.maxDepth = maxDepth;
        this.pathConditions = Arrays.asList(Arrays.copyOf(pathFilters, pathFilters.length));
        this.subst = subst;

    public boolean execute() throws IOException {
        return execute(createFileVisitor(getBasePath(), pathConditions));

    public boolean execute(final FileVisitor<Path> visitor) throws IOException {
        final long start = System.nanoTime();
        LOGGER.debug("Starting {}", this);

        Files.walkFileTree(getBasePath(), options, maxDepth, visitor);

        final double duration = System.nanoTime() - start;
        LOGGER.debug("{} complete in {} seconds", getClass().getSimpleName(), duration / TimeUnit.SECONDS.toNanos(1));

        // TODO return (visitor.success || ignoreProcessingFailure)
        return true; // do not abort rollover even if processing failed

     * Creates a new {@code FileVisitor<Path>} to pass to the {@link Files#walkFileTree(Path, Set, int, FileVisitor)}
     * method when the {@link #execute()} method is invoked.
     * <p>
     * The visitor is responsible for processing the files it encounters that are accepted by all filters.
     * @param visitorBaseDir base dir from where to start scanning for files to process
     * @param conditions filters that determine if a file should be processed
     * @return a new {@code FileVisitor<Path>}
    protected abstract FileVisitor<Path> createFileVisitor(final Path visitorBaseDir,
            final List<PathCondition> conditions);

     * Returns the base path from where to start scanning for files to delete. Lookups are resolved, so if the
     * configuration was <code>&lt;Delete basePath="${sys:user.home}/abc" /&gt;</code> then this method returns a path
     * to the "abc" file or directory in the user's home directory.
     * @return the base path (all lookups resolved)
    public Path getBasePath() {
        return Paths.get(subst.replace(getBasePathString()));

     * Returns the base path as it was specified in the configuration. Lookups are not resolved.
     * @return the base path as it was specified in the configuration
    public String getBasePathString() {
        return basePathString;

    public StrSubstitutor getStrSubstitutor() {
        return subst;

     * Returns whether to follow symbolic links or not.
     * @return the options
    public Set<FileVisitOption> getOptions() {
        return Collections.unmodifiableSet(options);

     * Returns whether to follow symbolic links or not.
     * @return whether to follow symbolic links or not
    public boolean isFollowSymbolicLinks() {
        return options.contains(FileVisitOption.FOLLOW_LINKS);

     * Returns the maximum number of directory levels to visit.
     * @return the maxDepth
    public int getMaxDepth() {
        return maxDepth;

     * Returns the list of PathCondition objects.
     * @return the pathFilters
    public List<PathCondition> getPathConditions() {
        return Collections.unmodifiableList(pathConditions);

    public String toString() {
        return getClass().getSimpleName() + "[basePath=" + getBasePath() + ", options=" + options + ", maxDepth="
                + maxDepth + ", conditions=" + pathConditions + "]";



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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