/*
* 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.geronimo.monitoring.console;
import java.io.IOException;
import javax.servlet.GenericServlet;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.ServletException;
import javax.servlet.ServletConfig;
import javax.servlet.RequestDispatcher;
import javax.annotation.Resource;
import javax.transaction.UserTransaction;
import javax.persistence.PersistenceContext;
import javax.persistence.EntityManager;
import javax.portlet.RenderRequest;
import javax.portlet.PortletException;
import org.apache.geronimo.monitoring.console.data.Graph;
/**
* @version $Rev: 720024 $ $Date: 2008-11-24 02:32:00 +0800 (Mon, 24 Nov 2008) $
*/
public class PopUpGraphServlet extends GenericServlet {
@Resource
UserTransaction userTransaction;
@PersistenceContext
EntityManager entityManager;
private RequestDispatcher jspDispatcher;
/**
* Called by the servlet container to indicate to a servlet that the
* servlet is being placed into service. See {@link javax.servlet.Servlet#init}.
* <p/>
* <p>This implementation stores the {@link javax.servlet.ServletConfig}
* object it receives from the servlet container for later use.
* When overriding this form of the method, call
* <code>super.init(config)</code>.
*
* @param config the <code>ServletConfig</code> object
* that contains configutation
* information for this servlet
* @throws javax.servlet.ServletException if an exception occurs that
* interrupts the servlet's normal
* operation
* @see javax.servlet.UnavailableException
*/
@Override
public void init(ServletConfig config) throws ServletException {
jspDispatcher = config.getServletContext().getRequestDispatcher("/monitoringPopUpGraph.jsp");
}
/**
* Called by the servlet container to allow the servlet to respond to
* a request. See {@link javax.servlet.Servlet#service}.
* <p/>
* <p>This method is declared abstract so subclasses, such as
* <code>HttpServlet</code>, must override it.
*
* @param req the <code>ServletRequest</code> object
* that contains the client's request
* @param res the <code>ServletResponse</code> object
* that will contain the servlet's response
* @throws javax.servlet.ServletException if an exception occurs that
* interferes with the servlet's
* normal operation occurred
* @throws java.io.IOException if an input or output
* exception occurs
*/
public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
addGraphAttribute(req);
jspDispatcher.forward(req, res);
}
private void addGraphAttribute(ServletRequest request) throws ServletException {
try {
userTransaction.begin();
try {
String graphIdString = request.getParameter("graph_id");
int graphId = Integer.parseInt(graphIdString);
Graph graph = (Graph) entityManager.createNamedQuery("graphById").setParameter("id", graphId).getSingleResult();
StatsGraph statsGraph = new GraphsBuilder().getStatsGraph(graph);
request.setAttribute("statsGraph", statsGraph);
} finally {
userTransaction.commit();
}
} catch (Exception e) {
throw new ServletException(e);
}
}
}