/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.chain.apps.example;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.chain.Catalog;
import org.apache.commons.chain.CatalogFactory;
import org.apache.commons.chain.Command;
import org.apache.commons.chain.web.servlet.ServletWebContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Custom chain servlet implementation.
*/
public class ExampleServlet extends HttpServlet {
private String servletName;
/**
* <p>Cache the name of the servlet.</p>
*
* @exception ServletException if an initialization error occurs
*/
public void init() throws ServletException {
super.init();
Log log = LogFactory.getLog(ExampleServlet.class);
servletName = getServletConfig().getServletName();
if (log.isInfoEnabled()) {
log.info("Initializing chain example servlet '"
+ servletName + "'");
}
}
/**
* <p>Configure a {@link ServletWebContext} for the current request, and
* pass it to the <code>execute()</code> method of the specified
* {@link Command}, loaded from our configured {@link Catalog}.</p>
*
* @param request The request we are processing
* @param response The response we are creating
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet exception occurs
*/
public void service(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
CatalogFactory factory = CatalogFactory.getInstance();
Catalog catalog = factory.getCatalog(servletName);
if (catalog == null) {
catalog = factory.getCatalog();
}
ServletWebContext context =
new ServletWebContext(getServletContext(), request, response);
Command command = catalog.getCommand("COMMAND_MAPPER");
try {
command.execute(context);
} catch (Exception e) {
throw new ServletException(e);
}
}
}