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 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.

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org/apache/logging/log4j/core/appender/rolling/action/ScriptCondition.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.appender.rolling.action;

import java.nio.file.Path;
import java.util.List;
import java.util.Objects;

import javax.script.SimpleBindings;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.Core;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.core.script.AbstractScript;
import org.apache.logging.log4j.core.script.ScriptFile;
import org.apache.logging.log4j.core.script.ScriptRef;
import org.apache.logging.log4j.status.StatusLogger;

/**
 * A condition of the {@link DeleteAction} where a user-provided script selects the files to delete from a provided
 * list. The specified script may be a {@link Script}, a {@link ScriptFile} or a {@link ScriptRef}.
 *
 * @see #createCondition(AbstractScript, Configuration)
 */
@Plugin(name = "ScriptCondition", category = Core.CATEGORY_NAME, printObject = true)
public class ScriptCondition {
    private static Logger LOGGER = StatusLogger.getLogger();

    private final AbstractScript script;
    private final Configuration configuration;

    /**
     * Constructs a new ScriptCondition.
     *
     * @param script the script that can select files to delete
     * @param configuration configuration containing the StrSubstitutor passed to the script
     */
    public ScriptCondition(final AbstractScript script, final Configuration configuration) {
        this.script = Objects.requireNonNull(script, "script");
        this.configuration = Objects.requireNonNull(configuration, "configuration");
        if (!(script instanceof ScriptRef)) {
            configuration.getScriptManager().addScript(script);
        }
    }

    /**
     * Executes the script
     *
     * @param baseDir
     * @param candidates
     * @return
     */
    @SuppressWarnings("unchecked")
    public List<PathWithAttributes> selectFilesToDelete(final Path basePath, final List<PathWithAttributes> candidates) {
        final SimpleBindings bindings = new SimpleBindings();
        bindings.put("basePath", basePath);
        bindings.put("pathList", candidates);
        bindings.putAll(configuration.getProperties());
        bindings.put("configuration", configuration);
        bindings.put("substitutor", configuration.getStrSubstitutor());
        bindings.put("statusLogger", LOGGER);
        final Object object = configuration.getScriptManager().execute(script.getName(), bindings);
        return (List<PathWithAttributes>) object;
    }

    /**
     * Creates the ScriptCondition.
     *
     * @param script The script to run. This may be a {@link Script}, a {@link ScriptFile} or a {@link ScriptRef}. The
     *            script must return a {@code List<PathWithAttributes>}. When the script is executed, it is provided the
     *            following bindings:
     *            <ul>
     *            <li>basePath - the directory from where the {@link DeleteAction Delete} action started scanning for
     *            files to delete. Can be used to relativize the paths in the pathList.</li>
     *            <li>pathList - a {@code java.util.List} containing {@link PathWithAttribute} objects. (The script is
     *            free to modify and return this list.)</li>
     *            <li>substitutor - a {@link StrSubstitutor} that can be used to look up variables embedded in the base
     *            dir or other properties
     *            <li>statusLogger - the {@link StatusLogger} that can be used to log events during script execution
     *            <li>any properties declared in the configuration</li>
     *            </ul>
     * @param configuration the configuration
     * @return A ScriptCondition.
     */
    @PluginFactory
    public static ScriptCondition createCondition(@PluginElement("Script") final AbstractScript script,
            @PluginConfiguration final Configuration configuration) {

        if (script == null) {
            LOGGER.error("A Script, ScriptFile or ScriptRef element must be provided for this ScriptCondition");
            return null;
        }
        if (script instanceof ScriptRef) {
            if (configuration.getScriptManager().getScript(script.getName()) == null) {
                LOGGER.error("ScriptCondition: No script with name {} has been declared.", script.getName());
                return null;
            }
        }
        return new ScriptCondition(script, configuration);
    }
}

org/apache/logging/log4j/core/appender/rolling/action/ScriptCondition.java

 

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