ca.unx.template.config.WebAppInitializer.java Source code

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Here is the source code for ca.unx.template.config.WebAppInitializer.java

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/*
 * The MIT License (MIT)
 * Copyright (C) 2012 Jason Ish
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the Software), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package ca.unx.template.config;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.health.HealthCheckRegistry;
import com.codahale.metrics.servlets.AdminServlet;
import com.codahale.metrics.servlets.HealthCheckServlet;
import com.codahale.metrics.servlets.MetricsServlet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.filter.DelegatingFilterProxy;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

import javax.servlet.*;

public class WebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer
        implements ServletContextListener {

    final Logger logger = LoggerFactory.getLogger(getClass());

    /**
     * See {@link AbstractAnnotationConfigDispatcherServletInitializer}.
     */
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return null;
    }

    /**
     * Set the application context for the Spring MVC web tier.
     *
     * @See {@link AbstractAnnotationConfigDispatcherServletInitializer}
     */
    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class<?>[] { MvcConfiguration.class };
    }

    /**
     * Map the Spring MVC servlet as the root.
     *
     * @See {@link AbstractAnnotationConfigDispatcherServletInitializer}
     */
    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {

        /* Let super do its thing... */
        super.onStartup(servletContext);

        /* Add the Spring Security filter. */
        servletContext.addFilter("springSecurityFilterChain", new DelegatingFilterProxy())
                .addMappingForUrlPatterns(null, false, "/*");

        // Add metrics servlet.
        ServletRegistration.Dynamic metricsServlet = servletContext.addServlet("metrics", AdminServlet.class);
        metricsServlet.addMapping("/metrics/*");
    }

    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        try {
            onStartup(servletContextEvent.getServletContext());
        } catch (ServletException e) {
            logger.error("Failed to initialize web application", e);
            System.exit(0);
        }
    }

    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
    }

    /**
     * Overrided to squelch a meaningless log message when embedded.
     */
    @Override
    protected void registerContextLoaderListener(ServletContext servletContext) {
    }
}