Source Code for Apache Log4j Web Servlet Containers

Apache Log4j Web Servlet Containers provides support for automatically enabling Log4j in Servlet containers.

Bytecode (Java 8) for Apache Log4j Web Servlet Containers is provided in a separate JAR file like log4j-web-2.14.1.jar.

Source Code files for Apache Log4j IOStreams 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 Web Servlet Containers 2.14.1 below.

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org/apache/logging/log4j/web/Log4jServletContextListener.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.web;

import java.util.Locale;
import java.util.concurrent.TimeUnit;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.LifeCycle2;
import org.apache.logging.log4j.status.StatusLogger;
import org.apache.logging.log4j.util.Strings;

/**
 * In environments older than Servlet 3.0, this initializer is responsible for starting up Log4j logging before anything
 * else happens in application initialization. In all environments, this shuts down Log4j after the application shuts
 * down.
 */
public class Log4jServletContextListener implements ServletContextListener {

	private static final int DEFAULT_STOP_TIMEOUT = 30;
    private static final TimeUnit DEFAULT_STOP_TIMEOUT_TIMEUNIT = TimeUnit.SECONDS;

	private static final String KEY_STOP_TIMEOUT = "log4j.stop.timeout";
	private static final String KEY_STOP_TIMEOUT_TIMEUNIT = "log4j.stop.timeout.timeunit";

	private static final Logger LOGGER = StatusLogger.getLogger();

    private ServletContext servletContext;
    private Log4jWebLifeCycle initializer;

    @Override
    public void contextInitialized(final ServletContextEvent event) {
        this.servletContext = event.getServletContext();
        LOGGER.debug("Log4jServletContextListener ensuring that Log4j starts up properly.");
        
        if ("true".equalsIgnoreCase(servletContext.getInitParameter(
                Log4jWebSupport.IS_LOG4J_AUTO_SHUTDOWN_DISABLED))) {
        	throw new IllegalStateException("Do not use " + getClass().getSimpleName() + " when "
        			+ Log4jWebSupport.IS_LOG4J_AUTO_SHUTDOWN_DISABLED + " is true. Please use "
        			+ Log4jShutdownOnContextDestroyedListener.class.getSimpleName() + " instead of "
        			+ getClass().getSimpleName() + ".");
        }

        this.initializer = WebLoggerContextUtils.getWebLifeCycle(this.servletContext);
        try {
            this.initializer.start();
            this.initializer.setLoggerContext(); // the application is just now starting to start up
        } catch (final IllegalStateException e) {
            throw new IllegalStateException("Failed to initialize Log4j properly.", e);
        }
    }

    @Override
	public void contextDestroyed(final ServletContextEvent event) {
		if (this.servletContext == null || this.initializer == null) {
			LOGGER.warn("Context destroyed before it was initialized.");
			return;
		}
		LOGGER.debug("Log4jServletContextListener ensuring that Log4j shuts down properly.");

		this.initializer.clearLoggerContext(); // the application is finished
		// shutting down now
		if (initializer instanceof LifeCycle2) {
			final String stopTimeoutStr = servletContext.getInitParameter(KEY_STOP_TIMEOUT);
			final long stopTimeout = Strings.isEmpty(stopTimeoutStr) ? DEFAULT_STOP_TIMEOUT
					: Long.parseLong(stopTimeoutStr);
			final String timeoutTimeUnitStr = servletContext.getInitParameter(KEY_STOP_TIMEOUT_TIMEUNIT);
			final TimeUnit timeoutTimeUnit = Strings.isEmpty(timeoutTimeUnitStr) ? DEFAULT_STOP_TIMEOUT_TIMEUNIT
					: TimeUnit.valueOf(timeoutTimeUnitStr.toUpperCase(Locale.ROOT));
			((LifeCycle2) this.initializer).stop(stopTimeout, timeoutTimeUnit);
		} else {
			this.initializer.stop();
		}
	}
}

org/apache/logging/log4j/web/Log4jServletContextListener.java

 

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2015-11-04, 6875👍, 0💬