/*
* Copyright 2008-2009 LinkedIn, Inc
*
* 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 voldemort.server.http;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.apache.log4j.Logger;
import voldemort.server.VoldemortConfig;
import voldemort.server.VoldemortServer;
import voldemort.server.http.gui.VelocityEngine;
import voldemort.utils.ConfigurationException;
/**
* A helper class that loads the Voldemort server by bootstrapping from the
* VOLDEMORT_HOME environment variable.
*
*
*/
public class VoldemortServletContextListener implements ServletContextListener {
public static final String VOLDEMORT_TEMPLATE_DIR = "voldemort/server/http/gui/templates";
public static final String SERVER_KEY = "vldmt_server";
public static final String SERVER_CONFIG_KEY = "vldmt_config";
public static final String VELOCITY_ENGINE_KEY = "vldmt_velocity_engine";
private static final Logger logger = Logger.getLogger(VoldemortServletContextListener.class.getName());
public void contextDestroyed(ServletContextEvent event) {
logger.info("Calling application shutdown...");
VoldemortServer server = (VoldemortServer) event.getServletContext()
.getAttribute(SERVER_KEY);
if(server != null)
server.stop();
logger.info("Destroying application...");
event.getServletContext().removeAttribute(SERVER_KEY);
event.getServletContext().removeAttribute(SERVER_CONFIG_KEY);
event.getServletContext().removeAttribute(VELOCITY_ENGINE_KEY);
}
public void contextInitialized(ServletContextEvent event) {
try {
logger.info("Creating application...");
VoldemortServer server = new VoldemortServer(VoldemortConfig.loadFromEnvironmentVariable());
event.getServletContext().setAttribute(SERVER_KEY, server);
event.getServletContext().setAttribute(SERVER_CONFIG_KEY, server.getVoldemortConfig());
event.getServletContext().setAttribute(VELOCITY_ENGINE_KEY,
new VelocityEngine(VOLDEMORT_TEMPLATE_DIR));
server.start();
logger.info("Application created.");
} catch(ConfigurationException e) {
logger.info("Error loading voldemort server:", e);
throw e;
} catch(Exception e) {
logger.error("Error loading voldemort server:", e);
throw new ConfigurationException(e);
}
}
}