EnvInitListener.java

package net.rrm.ehour.ui.listener;

import net.rrm.ehour.appconfig.EhourHomeUtil;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

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

/**
 * @author thies (Thies Edeling - thies@te-con.nl)
 *         Created on: 1/23/11 - 2:17 AM
 */
public class EnvInitListener implements ServletContextListener {
    private static final Logger LOG = Logger.getLogger(EnvInitListener.class);

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        String home = getEhourHomePath(sce);

        if (StringUtils.isBlank(home)) {
            throw new IllegalArgumentException("EHOUR_HOME environment variable or context parameter not defined - exiting");
        }

        EhourHomeUtil.setEhourHome(home);

        configureLog4j();

        LOG.info("EHOUR_HOME set to " + home);
    }

    private String getEhourHomePath(ServletContextEvent sce) {
        String home = EhourHomeUtil.getEhourHome();

        if (StringUtils.isBlank(home)) {
            home = sce.getServletContext().getInitParameter(EhourHomeUtil.EHOUR_HOME);
        }

        return home;
    }

    private void configureLog4j() {
        PropertyConfigurator.configure(EhourHomeUtil.getFileInConfDir("log4j.properties").getAbsolutePath());
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
    }
}