org.jasig.ssp.config.logging.ExternalConfigLoader.java Source code

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Here is the source code for org.jasig.ssp.config.logging.ExternalConfigLoader.java

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/**
 * Licensed to Apereo under one or more contributor license
 * agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.
 * Apereo 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 the following location:
 *
 *   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.jasig.ssp.config.logging;

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

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Simple utility listener to load certain properties before Spring Starts up.
 * 
 * Add this entry to your web.xml:
 * 
 * <pre>
 * <listener>
 *     <listener-class>org.jasig.ssp.config.logging.ExternalConfigLoaderContextListener</listener-class>
 *   </listener>
 * </pre>
 */
public class ExternalConfigLoader implements ServletContextListener {

    private static final Logger LOGGER = LoggerFactory.getLogger(ExternalConfigLoader.class);

    private static String configDir;

    private final boolean initLogback = true;

    @Override
    public void contextInitialized(final ServletContextEvent sce) {
        initConfigDirectory(sce);
        initLogConfig();
    }

    @Override
    public void contextDestroyed(final ServletContextEvent sce) {
        /**
         * Nothing to do here
         */
    }

    public static String getConfigDir() {
        return configDir;
    }

    private void initConfigDirectory(final ServletContextEvent sce) {
        final StringBuffer configLocation = new StringBuffer();

        final String environmentDefinedConf = System.getenv("SSP_CONFIGDIR");

        if (StringUtils.isBlank(environmentDefinedConf)) {

            final String contextDefinedConf = sce.getServletContext().getInitParameter("SSP_CONFIGDIR");

            if (StringUtils.isBlank(contextDefinedConf)) {
                LOGGER.error("Unable to set config directory.");
            } else {
                configLocation.append(contextDefinedConf);
            }

        } else {
            configLocation.append(environmentDefinedConf);
        }

        configDir = configLocation.toString();

        LOGGER.info("Config directory set to {}", configDir);
    }

    private void initLogConfig() {
        if (!initLogback) {
            return;
        }

        final StringBuffer configLocation = new StringBuffer();
        configLocation.append(configDir);
        configLocation.append(System.getProperty("file.separator"));
        configLocation.append("logback.xml");

        try {
            new LogBackConfigLoader(configLocation.toString());
        } catch (Exception e) {
            LOGGER.error("Unable to read config file from " + configLocation.toString(), e);
        }
    }
}