org.superbiz.javaee.listeners.AppContextListener.java Source code

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Here is the source code for org.superbiz.javaee.listeners.AppContextListener.java

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/**
 * Copyright (C) 2014 Carlos Chacin (cchacin@gmail.com)
 *
 * Licensed 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.superbiz.javaee.listeners;

import com.mysql.jdbc.AbandonedConnectionCleanupThread;
import io.netty.util.ThreadDeathWatcher;
import io.netty.util.concurrent.FastThreadLocal;
import org.redisson.Redisson;
import org.slf4j.Logger;

import javax.inject.Inject;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
import java.sql.Driver;
import java.util.Enumeration;

@WebListener
public class AppContextListener implements ServletContextListener {

    @Inject
    private transient Logger logger;

    @Inject
    private transient Redisson redisson;

    @Override
    public void contextInitialized(final ServletContextEvent servletContextEvent) {
        logger.info("Initializing application context: {}",
                servletContextEvent.getServletContext().getContextPath());
    }

    @Override
    public void contextDestroyed(final ServletContextEvent servletContextEvent) {
        logger.info("Destroying application context: {}", servletContextEvent.getServletContext().getContextPath());
        try {
            logger.info("Shutting down AbandonedConnection");
            AbandonedConnectionCleanupThread.shutdown();
        } catch (Throwable t) {
            logger.error("Exception shutting down AbandonedConnection: {}", t);
        }

        // This manually deregisters JDBC driver, which prevents Tomcat 7 from
        // complaining about memory leaks
        Enumeration<Driver> drivers = java.sql.DriverManager.getDrivers();
        while (drivers.hasMoreElements()) {
            java.sql.Driver driver = drivers.nextElement();
            logger.info("Deregistering JDBC driver: {}", driver);
            try {
                java.sql.DriverManager.deregisterDriver(driver);
            } catch (Throwable t) {
                logger.error("Exception deregistering drivers: {}", t);
            }
        }

        try {
            logger.info("Shutting down Redisson: {}", redisson.getConfig());
            redisson.shutdown();
        } catch (Exception e) {
            logger.error("Error shutting down Redisson: {}", e);
        }

        try {
            FastThreadLocal.removeAll();
            FastThreadLocal.destroy();
        } catch (Exception e) {
            logger.error("Fatal error: {}", e);
        }
    }
}