/*************************GO-LICENSE-START*********************************
* Copyright 2014 ThoughtWorks, 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.
*************************GO-LICENSE-END***********************************/
package com.thoughtworks.go.rackhack;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpServlet;
import java.lang.reflect.Constructor;
public class DelegatingListener implements ServletContextListener {
public static final String DELEGATE_SERVLET = "delegate.servlet.name";
public void contextInitialized(ServletContextEvent evt) {
ServletContext ctx = evt.getServletContext();
ctx.setAttribute(DELEGATE_SERVLET, createServlet(ctx.getInitParameter(DELEGATE_SERVLET)));
}
private HttpServlet createServlet(String attribute) {
HttpServlet servlet = null;
try {
Class servletKlass = Class.forName(attribute);
Constructor cons = servletKlass.getConstructor();
servlet = (HttpServlet) cons.newInstance();
} catch (Exception e) {
throw new RuntimeException(e);
}
return servlet;
}
public void contextDestroyed(ServletContextEvent servletContextEvent) {
}
}