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 apache-log4j-2.14.1-bin.zip and source package like apache-log4j-2.14.1-src.zip. You can download them at Apache Log4j Website.

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

⏎ org/apache/logging/log4j/core/net/DatagramSocketManager.java

/*
 * 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the license for the specific language governing permissions and
 * limitations under the license.
 */
package org.apache.logging.log4j.core.net;

import java.io.OutputStream;
import java.io.Serializable;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.Map;

import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.appender.ManagerFactory;
import org.apache.logging.log4j.util.Strings;

/**
 * Socket Manager for UDP connections.
 */
public class DatagramSocketManager extends AbstractSocketManager {

    private static final DatagramSocketManagerFactory FACTORY = new DatagramSocketManagerFactory();

    /**
     * The Constructor.
     * @param name The unique name of the connection.
     * @param os The OutputStream.
     * @param inetAddress
     * @param host The host to connect to.
     * @param port The port on the host.
     * @param layout The layout
     * @param bufferSize The buffer size
     */
    protected DatagramSocketManager(final String name, final OutputStream os, final InetAddress inetAddress, final String host,
                final int port, final Layout<? extends Serializable> layout, final int bufferSize) {
        super(name, os, inetAddress, host, port, layout, true, bufferSize);
    }

    /**
     * Obtain a SocketManager.
     * @param host The host to connect to.
     * @param port The port on the host.
     * @param layout The layout.
     * @param bufferSize The buffer size.
     * @return A DatagramSocketManager.
     */
    public static DatagramSocketManager getSocketManager(final String host, final int port,
            final Layout<? extends Serializable> layout, final int bufferSize) {
        if (Strings.isEmpty(host)) {
            throw new IllegalArgumentException("A host name is required");
        }
        if (port <= 0) {
            throw new IllegalArgumentException("A port value is required");
        }
        return (DatagramSocketManager) getManager("UDP:" + host + ':' + port,
                new FactoryData(host, port, layout, bufferSize), FACTORY);
    }

    /**
     * Gets this DatagramSocketManager's content format. Specified by:
     * <ul>
     * <li>Key: "protocol" Value: "udp"</li>
     * <li>Key: "direction" Value: "out"</li>
     * </ul>
     *
     * @return Map of content format keys supporting DatagramSocketManager
     */
    @Override
    public Map<String, String> getContentFormat() {
        final Map<String, String> result = new HashMap<>(super.getContentFormat());
        result.put("protocol", "udp");
        result.put("direction", "out");
        return result;
    }

    /**
     * Data for the factory.
     */
    private static class FactoryData {
        private final String host;
        private final int port;
        private final Layout<? extends Serializable> layout;
        private final int bufferSize;

        public FactoryData(final String host, final int port, final Layout<? extends Serializable> layout, final int bufferSize) {
            this.host = host;
            this.port = port;
            this.layout = layout;
            this.bufferSize = bufferSize;
        }
    }

    /**
     * Factory to create the DatagramSocketManager.
     */
    private static class DatagramSocketManagerFactory implements ManagerFactory<DatagramSocketManager, FactoryData> {

        @Override
        public DatagramSocketManager createManager(final String name, final FactoryData data) {
            InetAddress inetAddress;
            try {
                inetAddress = InetAddress.getByName(data.host);
            } catch (final UnknownHostException ex) {
                LOGGER.error("Could not find address of " + data.host, ex);
                return null;
            }
            final OutputStream os = new DatagramOutputStream(data.host, data.port, data.layout.getHeader(),
                    data.layout.getFooter());
            return new DatagramSocketManager(name, os, inetAddress, data.host, data.port, data.layout, data.bufferSize);
        }
    }
}

⏎ org/apache/logging/log4j/core/net/DatagramSocketManager.java

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
Download 

⇒ Source Code for Apache Log4j JDK Logging Adapter

⇐ Source Code for Apache Log4j API

⇑ Downloading and Reviewing Apache Log4j Packages

⇑⇑ FAQ for Apache Log4j