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/JndiManager.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.util.Properties;
import java.util.concurrent.TimeUnit;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import org.apache.logging.log4j.core.appender.AbstractManager;
import org.apache.logging.log4j.core.appender.ManagerFactory;
import org.apache.logging.log4j.core.util.JndiCloser;

/**
 * Manages a JNDI {@link javax.naming.Context}.
 *
 * @since 2.1
 */
public class JndiManager extends AbstractManager {

    private static final JndiManagerFactory FACTORY = new JndiManagerFactory();

    private final Context context;

    private JndiManager(final String name, final Context context) {
        super(null, name);
        this.context = context;
    }

    /**
     * Gets the default JndiManager using the default {@link javax.naming.InitialContext}.
     *
     * @return the default JndiManager
     */
    public static JndiManager getDefaultManager() {
        return getManager(JndiManager.class.getName(), FACTORY, null);
    }

    /**
     * Gets a named JndiManager using the default {@link javax.naming.InitialContext}.
     *
     * @param name the name of the JndiManager instance to create or use if available
     * @return a default JndiManager
     */
    public static JndiManager getDefaultManager(final String name) {
        return getManager(name, FACTORY, null);
    }

    /**
     * Gets a JndiManager with the provided configuration information.
     *
     * @param initialContextFactoryName Fully qualified class name of an implementation of
     *                                  {@link javax.naming.spi.InitialContextFactory}.
     * @param providerURL               The provider URL to use for the JNDI connection (specific to the above factory).
     * @param urlPkgPrefixes            A colon-separated list of package prefixes for the class name of the factory
     *                                  class that will create a URL context factory
     * @param securityPrincipal         The name of the identity of the Principal.
     * @param securityCredentials       The security credentials of the Principal.
     * @param additionalProperties      Any additional JNDI environment properties to set or {@code null} for none.
     * @return the JndiManager for the provided parameters.
     */
    public static JndiManager getJndiManager(final String initialContextFactoryName,
            final String providerURL,
            final String urlPkgPrefixes,
            final String securityPrincipal,
            final String securityCredentials,
            final Properties additionalProperties) {
        final Properties properties = createProperties(initialContextFactoryName, providerURL, urlPkgPrefixes,
                securityPrincipal, securityCredentials, additionalProperties);
        return getManager(createManagerName(), FACTORY, properties);
    }

    /**
     * Gets a JndiManager with the provided configuration information.
     *
     * @param properties JNDI properties, usually created by calling {@link #createProperties(String, String, String, String, String, Properties)}.
     * @return the JndiManager for the provided parameters.
     * @see #createProperties(String, String, String, String, String, Properties)
     * @since 2.9
     */
    public static JndiManager getJndiManager(final Properties properties) {
        return getManager(createManagerName(), FACTORY, properties);
    }

    private static String createManagerName() {
        return JndiManager.class.getName() + '@' + JndiManager.class.hashCode();
    }

    /**
     * Creates JNDI Properties with the provided configuration information.
     *
     * @param initialContextFactoryName
     *            Fully qualified class name of an implementation of {@link javax.naming.spi.InitialContextFactory}.
     * @param providerURL
     *            The provider URL to use for the JNDI connection (specific to the above factory).
     * @param urlPkgPrefixes
     *            A colon-separated list of package prefixes for the class name of the factory class that will create a
     *            URL context factory
     * @param securityPrincipal
     *            The name of the identity of the Principal.
     * @param securityCredentials
     *            The security credentials of the Principal.
     * @param additionalProperties
     *            Any additional JNDI environment properties to set or {@code null} for none.
     * @return the Properties for the provided parameters.
     * @since 2.9
     */
    public static Properties createProperties(final String initialContextFactoryName, final String providerURL,
            final String urlPkgPrefixes, final String securityPrincipal, final String securityCredentials,
            final Properties additionalProperties) {
        if (initialContextFactoryName == null) {
            return null;
        }
        final Properties properties = new Properties();
        properties.setProperty(Context.INITIAL_CONTEXT_FACTORY, initialContextFactoryName);
        if (providerURL != null) {
            properties.setProperty(Context.PROVIDER_URL, providerURL);
        } else {
            LOGGER.warn("The JNDI InitialContextFactory class name [{}] was provided, but there was no associated "
                    + "provider URL. This is likely to cause problems.", initialContextFactoryName);
        }
        if (urlPkgPrefixes != null) {
            properties.setProperty(Context.URL_PKG_PREFIXES, urlPkgPrefixes);
        }
        if (securityPrincipal != null) {
            properties.setProperty(Context.SECURITY_PRINCIPAL, securityPrincipal);
            if (securityCredentials != null) {
                properties.setProperty(Context.SECURITY_CREDENTIALS, securityCredentials);
            } else {
                LOGGER.warn("A security principal [{}] was provided, but with no corresponding security credentials.",
                        securityPrincipal);
            }
        }
        if (additionalProperties != null) {
            properties.putAll(additionalProperties);
        }
        return properties;
    }

    @Override
    protected boolean releaseSub(final long timeout, final TimeUnit timeUnit) {
        return JndiCloser.closeSilently(this.context);
    }

    /**
     * Looks up a named object through this JNDI context.
     *
     * @param name name of the object to look up.
     * @param <T>  the type of the object.
     * @return the named object if it could be located.
     * @throws  NamingException if a naming exception is encountered
     */
    @SuppressWarnings("unchecked")
    public <T> T lookup(final String name) throws NamingException {
        return (T) this.context.lookup(name);
    }

    private static class JndiManagerFactory implements ManagerFactory<JndiManager, Properties> {

        @Override
        public JndiManager createManager(final String name, final Properties data) {
            try {
                return new JndiManager(name, new InitialContext(data));
            } catch (final NamingException e) {
                LOGGER.error("Error creating JNDI InitialContext.", e);
                return null;
            }
        }
    }

    @Override
    public String toString() {
        return "JndiManager [context=" + context + ", count=" + count + "]";
    }

}

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

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