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/*
* 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.tuscany.samples.web;
import java.io.IOException;
import javax.servlet.http.HttpServlet;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.tuscany.das.rdb.dbconfig.DBInitializer;
/**
* This is generic servlet where based on serviceName, it will call the speciliazed processor to
* process request and obtain response. This servlet can be used in any web sample, just needs to
* pass appropriate serviceProcessorClassName and rest is generic
*
*/
public class CommandServlet extends HttpServlet {
final static long serialVersionUID = 1221332432;
/*
* (non-Java-doc)
*
* @see javax.servlet.http.HttpServlet#HttpServlet()
*/
public CommandServlet() {
super();
}
public static void refreshDB() throws ServletException {
try{
DBInitializer dbInitializer = new DBInitializer("AjaxDBConfig.xml");
dbInitializer.refreshDatabaseData();
}catch(Exception e){
e.printStackTrace();
ServletException se = new ServletException(e.getMessage());
throw se;
}
}
public void init(ServletConfig config) throws ServletException {
refreshDB();
}
/*
* (non-Java-doc)
*
* @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest arg0,
* HttpServletResponse arg1)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doTask(request, response);
}
/*
* (non-Java-doc)
*
* @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest arg0,
* HttpServletResponse arg1)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doTask(request, response);
}
/**Invoke passed service and return result
*
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
public void doTask(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String textContentType= "text/text";
String xmlContentType= "text/xml";
String refreshRequest = req.getParameter("refreshDB");
if(refreshRequest != null && refreshRequest.equals("yes")){
{
try{
refreshDB();
}catch(ServletException e){
throw e;
}
}
this.writeResponse(resp, "Refreshed database!", textContentType);
}
else{
String serviceName = req.getParameter("serviceName");//e.g. DASQueryProcessor
String qry = req.getParameter("Query");//e.g. query:xxx, command:yyy
String configFile = req.getParameter("configFile");//name of DAS config file
try{
ServiceProcessor serviceClassInst = null;
//so any subclass of abstract ServiceProcessor can be used
Object obj = Class.forName(serviceName).newInstance();
if(obj instanceof ServiceProcessor){
serviceClassInst = (ServiceProcessor)obj;
}
String result = serviceClassInst.execute(qry, configFile);
this.writeResponse(resp, result, xmlContentType);
}catch(Exception e){
this.writeResponse(resp, e.getMessage(), textContentType);
e.printStackTrace();
}
}
}
/**Write response in required content type to servlet response
*
* @param resp
* @param output
* @param contentType
* @throws IOException
*/
public void writeResponse(HttpServletResponse resp, String output, String contentType) throws IOException {
resp.setContentType(contentType);//"text/text", "text/xml"
resp.setHeader("Cache-Control", "no-cache");
resp.getWriter().write(output);
}
// Utility methods
public void gotoURL(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, String url) throws ServletException, IOException {
url = response.encodeURL(url);
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(url);
dispatcher.forward(request, response);
}
public void redirectURL(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, String url) throws ServletException, IOException {
url = response.encodeURL(request.getContextPath() + url);
response.sendRedirect(url);
}
public void forwardURL(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, String url) throws ServletException, IOException {
url = response.encodeURL(url);
RequestDispatcher dispatch = getServletContext().getRequestDispatcher(url);
dispatch.forward(request, response);
}
}
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