org.ff4j.web.FF4jInitServlet Maven / Gradle / Ivy
package org.ff4j.web;
/*
* #%L
* ff4j-web
* %%
* Copyright (C) 2013 - 2015 Ff4J
* %%
* 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.
* #L%
*/
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import org.ff4j.web.embedded.ConsoleConstants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Servlet initialisation to put FF4J in HTTP Session.
*
* @author Cedrick LUNVEN
*/
public class FF4jInitServlet extends HttpServlet implements ConsoleConstants {
/** Serial. */
private static final long serialVersionUID = 8447941463286918975L;
/** Logger for this class. */
public static final Logger logger = LoggerFactory.getLogger(FF4jInitServlet.class);
/** {@inheritDoc} */
@Override
public void init(ServletConfig servletConfig) throws ServletException {
logger.debug("Insert FF4J into web session");
String className = servletConfig.getInitParameter(PROVIDER_PARAM_NAME);
if (className == null) {
throw new IllegalStateException("Cannot initialize Servlet "
+ getClass() + " : expecting parameter'"
+ PROVIDER_PARAM_NAME + "'");
}
FF4JProvider ff4jProvider = null;
try {
Class c = Class.forName(className);
Object o = c.newInstance();
ff4jProvider = (FF4JProvider) o;
logger.info(" __ __ _ _ _ ");
logger.info(" / _|/ _| || | (_)");
logger.info("| |_| |_| || |_| |");
logger.info("| _| _|__ _| |");
logger.info("|_| |_| |_|_/ |");
logger.info(" |__/ .v" + getClass().getPackage().getImplementationVersion());
logger.info(" ");
servletConfig.getServletContext().setAttribute(FF4J_SESSIONATTRIBUTE_NAME, ff4jProvider.getFF4j());
logger.info("ff4j class is now available in Session under 'FF4J' attribute name (required for taglib)");
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException("Cannot load ff4jProvider as " + ff4jProvider, e);
} catch (InstantiationException e) {
throw new IllegalArgumentException("Cannot instantiate " + ff4jProvider + " as ff4jProvider", e);
} catch (IllegalAccessException e) {
throw new IllegalArgumentException("No public constructor for " + ff4jProvider + " as ff4jProvider", e);
} catch (ClassCastException ce) {
throw new IllegalArgumentException("ff4jProvider expected instance of " + FF4JProvider.class, ce);
}
}
}