org.echocat.nodoodle.server.ServiceServlet.java Source code

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Here is the source code for org.echocat.nodoodle.server.ServiceServlet.java

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/*****************************************************************************************
 * *** BEGIN LICENSE BLOCK *****
 *
 * Version: MPL 2.0
 *
 * echocat NoDoodle, Copyright (c) 2010-2012 echocat
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * *** END LICENSE BLOCK *****
 ****************************************************************************************/

package org.echocat.nodoodle.server;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class ServiceServlet extends GenericServlet {

    private static final Logger LOG = LoggerFactory.getLogger(ServiceServlet.class);

    public static final String SERVICE_PARAM = "service";

    private HttpService _service;

    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        final WebApplicationContext applicationContext = WebApplicationContextUtils
                .getWebApplicationContext(config.getServletContext());
        final String serviceName = config.getInitParameter(SERVICE_PARAM);
        if (StringUtils.isEmpty(serviceName)) {
            throw new ServletException("Required initParam " + SERVICE_PARAM + " not set.");
        }
        try {
            _service = applicationContext.getBean(serviceName, HttpService.class);
        } catch (NoSuchBeanDefinitionException e) {
            throw new ServletException("No service '" + serviceName + "' (defined under initParam '" + SERVICE_PARAM
                    + "') could not be found.", e);
        }
        try {
            _service.init(config.getServletContext());
        } catch (Exception e) {
            throw new ServletException("Could not initiate the service: " + _service, e);
        }
    }

    @Override
    public void destroy() {
        try {
            if (_service != null) {
                try {
                    _service.destroy();
                } catch (Exception e) {
                    LOG.error("Could not clean destroy the service: " + _service, e);
                }
            }
        } finally {
            super.destroy();
        }
    }

    @Override
    public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException {
        final HttpService service = _service;
        if (service == null) {
            throw new ServletException("Was the init() method not called?");
        }
        service.handle((HttpServletRequest) request, (HttpServletResponse) response);
    }
}