edu.umd.cs.submitServer.servlets.ImportProject.java Source code

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Here is the source code for edu.umd.cs.submitServer.servlets.ImportProject.java

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/**
 * Marmoset: a student project snapshot, submission, testing and code review
 * system developed by the Univ. of Maryland, College Park
 * 
 * Developed as part of Jaime Spacco's Ph.D. thesis work, continuing effort led
 * by William Pugh. See http://marmoset.cs.umd.edu/
 * 
 * Copyright 2005 - 2011, Univ. of Maryland
 * 
 * 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 edu.umd.cs.submitServer.servlets;

import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import edu.umd.cs.marmoset.modelClasses.Course;
import edu.umd.cs.marmoset.modelClasses.Project;
import edu.umd.cs.marmoset.modelClasses.StudentRegistration;
import edu.umd.cs.submitServer.MultipartRequest;

public class ImportProject extends SubmitServerServlet {

    /**
     * The doPost method of the servlet. <br>
     * 
     * This method is called when a form has its tag value method equals to
     * post.
     * 
     * @param request
     *            the request send by the client to the server
     * @param response
     *            the response send by the server to the client
     * @throws ServletException
     *             if an error occurred
     * @throws IOException
     *             if an error occurred
     */
    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        Connection conn = null;
        FileItem fileItem = null;
        boolean transactionSuccess = false;
        try {
            conn = getConnection();

            // MultipartRequestFilter is required
            MultipartRequest multipartRequest = (MultipartRequest) request.getAttribute(MULTIPART_REQUEST);
            Course course = (Course) request.getAttribute(COURSE);
            StudentRegistration canonicalStudentRegistration = StudentRegistration.lookupByStudentRegistrationPK(
                    multipartRequest.getIntParameter("canonicalStudentRegistrationPK", 0), conn);

            fileItem = multipartRequest.getFileItem();

            conn.setAutoCommit(false);
            /*
             * 20090608: changed TRANSACTION_READ_COMMITTED to
             * TRANSACTION_REPEATABLE_READ to make transaction compatible with
             * innodb in MySQL 5.1, which defines READ_COMMITTED as unsafe for
             * use with standard binary logging. For more information, see:
             * <http
             * ://dev.mysql.com/doc/refman/5.1/en/set-transaction.html#isolevel_read
             * -committed>
             */
            conn.setTransactionIsolation(Connection.TRANSACTION_REPEATABLE_READ);

            Project project = Project.importProject(fileItem.getInputStream(), course, canonicalStudentRegistration,
                    conn);

            conn.commit();
            transactionSuccess = true;

            String redirectUrl = request.getContextPath() + "/view/instructor/projectUtilities.jsp?projectPK="
                    + project.getProjectPK();
            response.sendRedirect(redirectUrl);

        } catch (ClassNotFoundException e) {
            throw new ServletException(e);
        } catch (SQLException e) {
            throw new ServletException(e);
        } finally {
            rollbackIfUnsuccessfulAndAlwaysReleaseConnection(transactionSuccess, request, conn);
        }
    }
}