com.feilong.servlet.http.listener.AbstractServletContextInitializedListener Maven / Gradle / Ivy

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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.

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/*
 * Copyright (C) 2008 feilong
 *
 * 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 com.feilong.servlet.http.listener;

import static com.feilong.core.date.DateUtil.formatDuration;

import java.util.Date;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 只需要实现 {@link ServletContextListener#contextInitialized} 方法的 {@link ServletContextListener}.
 *
 * @author feilong
 * @since 1.14.3
 */
public abstract class AbstractServletContextInitializedListener implements ServletContextListener{

    /** The Constant log. */
    private static final Logger LOGGER = LoggerFactory.getLogger(AbstractServletContextInitializedListener.class);

    //---------------------------------------------------------------
    /**
     * Receives notification that the web application initialization process is starting.
     *
     * 
     * All ServletContextListeners are notified of context initialization before any filters or servlets in the web application are
     * initialized.
     * 
     */
    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent){
        Date beginDate = new Date();

        initialized(servletContextEvent);

        if (LOGGER.isInfoEnabled()){
            LOGGER.info("[{}] initialized use time: [{}]", getClass().getName(), formatDuration(beginDate));
        }
    }

    //---------------------------------------------------------------

    /**
     * Initialized.
     *
     * @param servletContextEvent
     *            the ServletContextEvent containing the ServletContext that is being initialized
     */
    protected abstract void initialized(ServletContextEvent servletContextEvent);

    //---------------------------------------------------------------

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
     */
    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent){

    }

}