org.apache.hawq.pxf.service.utilities.Log4jConfigure.java Source code

Introduction

Here is the source code for org.apache.hawq.pxf.service.utilities.Log4jConfigure.java

Source

package org.apache.hawq.pxf.service.utilities;

/*
 * 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.
 */

import java.io.File;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.log4j.PropertyConfigurator;

public class Log4jConfigure {

    private static final Log LOG = LogFactory.getLog(Log4jConfigure.class);

    /**
     * Initializes log4j logging for the webapp.
     *
     * Reads log4j properties file location from log4jConfigLocation parameter
     * in web.xml. When not using aboslute path, the path starts from the webapp
     * root directory. If the file can't be read, reverts to default
     * configuration file under WEB-INF/classes/pxf-log4j.properties.
     *
     * @param event Servlet context, used to determine webapp root directory.
     */
    public static void configure(ServletContextEvent event) {

        final String defaultLog4jLocation = "WEB-INF/classes/pxf-log4j.properties";

        ServletContext context = event.getServletContext();
        String log4jConfigLocation = context.getInitParameter("log4jConfigLocation");

        if (!log4jConfigLocation.startsWith(File.separator)) {
            log4jConfigLocation = context.getRealPath("") + File.separator + log4jConfigLocation;
        }

        // revert to default properties file if file doesn't exist
        File log4jConfigFile = new File(log4jConfigLocation);
        if (!log4jConfigFile.canRead()) {
            log4jConfigLocation = context.getRealPath("") + File.separator + defaultLog4jLocation;
        }
        PropertyConfigurator.configure(log4jConfigLocation);
        LOG.info("log4jConfigLocation = " + log4jConfigLocation);
    }
}