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/**
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* '$RCSfile$'
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* Purpose: A Class that implements a metadata catalog as a java Servlet
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* Copyright: 2006 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Matt Jones, Dan Higgins, Jivka Bojilova, Chad Berkley, Matthew Perry
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*
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* '$Author: daigle $'
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* '$Date: 2009-08-07 10:35:18 -0700 (Fri, 07 Aug 2009) $'
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* '$Revision: 5018 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.workflowscheduler;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.sql.SQLException;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.util.Timer;
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import javax.servlet.ServletConfig;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import org.apache.log4j.Logger;
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import org.apache.log4j.PropertyConfigurator;
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import edu.ucsb.nceas.metacat.database.DBConnectionPool;
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import edu.ucsb.nceas.metacat.properties.PropertyService;
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import edu.ucsb.nceas.metacat.scheduler.SchedulerService;
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import edu.ucsb.nceas.metacat.service.SessionService;
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import edu.ucsb.nceas.metacat.shared.BaseException;
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import edu.ucsb.nceas.metacat.shared.ServiceException;
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import edu.ucsb.nceas.metacat.util.ErrorSendingErrorException;
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import edu.ucsb.nceas.metacat.util.RequestUtil;
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import edu.ucsb.nceas.metacat.util.ResponseUtil;
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import edu.ucsb.nceas.metacat.util.SessionData;
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import edu.ucsb.nceas.utilities.FileUtil;
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/**
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* A workflow scheduling server implemented as a Java Servlet
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*
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* Valid actions are:
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*
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* action=scheduleWorkflow -- Schedule a workflow to be run. Scheduling a workflow
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* registers it with the scheduling engine and creates a row
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* in the scheduled_job table. Note that this may be
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* extracted into a separate servlet.
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* delay -- The amount of time from now before the workflow should be run. The
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* delay can be expressed in number of seconds, minutes, hours and days,
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* for instance 30s, 2h, etc.
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* starttime -- The time that the workflow should first run. If both are provided
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* this takes precedence over delay. The time should be expressed as:
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* MM/dd/yyyy HH:mm:ss with the timezone assumed to be that of the OS.
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* endtime -- The time when the workflow should end. The time should be expressed as:
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* MM/dd/yyyy HH:mm:ss with the timezone assumed to be that of the OS.
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* intervalvalue -- The numeric value of the interval between runs
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* intervalunit -- The unit of the interval between runs. Can be s, m, h, d for
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* seconds, minutes, hours and days respectively
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* workflowid -- The lsid of the workflow that we want to schedule. This workflow
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* must already exist in the database.
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* karid -- The karid for the workflow that we want to schedule.
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* workflowname -- The name of the workflow.
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* forwardto -- If provided, forward to this page when processing is done.
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* qformat -- If provided, render results using the stylesheets associated with
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* this skin. Default is xml.
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* action=unscheduleWorkflow -- Unschedule a workflow. Unscheduling a workflow
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* removes it from the scheduling engine and changes the
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* status in the scheduled_job table to " unscheduled. Note
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* that this may be extracted into a separate servlet.
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* workflowjobname -- The job ID for the workflow run that we want to unschedule. This
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* is held in the database as scheduled_job.name
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* forwardto -- If provided, forward to this page when processing is done.
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* qformat -- If provided, render results using the stylesheets associated with
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* this skin. Default is xml.
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* action=rescheduleWorkflow -- Unschedule a workflow. Rescheduling a workflow
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* registers it with the scheduling engine and changes the
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* status in the scheduled_job table to " scheduled. Note
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* that this may be extracted into a separate servlet.
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* workflowjobname -- The job ID for the workflow run that we want to reschedule. This
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* is held in the database as scheduled_job.name
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* forwardto -- If provided, forward to this page when processing is done.
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* qformat -- If provided, render results using the stylesheets associated with
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* this skin. Default is xml.
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* action=deleteScheduledWorkflow -- Delete a workflow. Deleting a workflow
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* removes it from the scheduling engine and changes the
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* status in the scheduled_job table to " deleted. Note
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* that this may be extracted into a separate servlet.
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* workflowjobname -- The job ID for the workflow run that we want to delete. This
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* is held in the database as scheduled_job.name
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* forwardto -- If provided, forward to this page when processing is done.
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* qformat -- If provided, render results using the stylesheets associated with
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* this skin. Default is xml.
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*
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*/
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public class WorkflowSchedulerServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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private Timer timer = null;
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// Constants -- these should be final in a servlet
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private static String LOG_CONFIG_NAME = null;
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public static final String APPLICATION_NAME = "workflowscheduler";
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/**
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* Initialize the servlet by creating appropriate database connections
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*/
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public void init(ServletConfig config) throws ServletException {
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Logger logMetacat = Logger.getLogger(WorkflowSchedulerServlet.class);
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try {
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super.init(config);
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ServletContext context = config.getServletContext();
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context.setAttribute("APPLICATION_NAME", APPLICATION_NAME);
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// Initialize the properties file
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String dirPath = context.getRealPath("./WEB-INF");
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LOG_CONFIG_NAME = dirPath + FileUtil.getFS() + "log4j.properties";
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PropertyConfigurator.configureAndWatch(LOG_CONFIG_NAME);
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PropertyService.getInstance(context);
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SessionService.getInstance();
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SchedulerService.getInstance();
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// initialize DBConnection pool
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DBConnectionPool connPool = DBConnectionPool.getInstance();
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logMetacat.debug("WorkflowSchedulerServlet.init - DBConnection pool initialized: " + connPool.toString());
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} catch (ServiceException se) {
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String errorMessage =
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"WorkflowSchedulerServlet.init - Service problem while intializing WorkflowScheduler Servlet: " + se.getMessage();
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logMetacat.error(errorMessage);
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throw new ServletException(errorMessage);
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} catch (SQLException e) {
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String errorMessage = "WorkflowSchedulerServlet.init - SQL problem while intializing WorkflowScheduler Servlet: "
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+ e.getMessage();
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logMetacat.error(errorMessage);
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throw new ServletException(errorMessage);
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}
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}
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/**
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* Close all db connections from the pool
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*/
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public void destroy() {
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Logger logMetacat = Logger.getLogger(WorkflowSchedulerServlet.class);
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try {
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SchedulerService.getInstance().stop();
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} catch (ServiceException se) {
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logMetacat.warn("WorkflowSchedulerServlet.destroy - Could not stop scheduler service: " + se.getMessage());
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}
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// Close all db connection
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logMetacat.warn("WorkflowSchedulerServlet.destroy - Destroying WorkflowSchedulerServlet");
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timer.cancel();
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// IndexingQueue.getInstance().setMetacatRunning(false);
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DBConnectionPool.release();
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}
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/** Handle "GET" method requests from HTTP clients */
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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// Process the data and send back the response
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handleGetOrPost(request, response);
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}
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/** Handle "POST" method requests from HTTP clients */
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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// Process the data and send back the response
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handleGetOrPost(request, response);
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}
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/**
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* Control servlet response depending on the action parameter specified
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*/
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private void handleGetOrPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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Logger logMetacat = Logger.getLogger(WorkflowSchedulerServlet.class);
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// Update the last update time for this user if they are not new
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HttpSession httpSession = request.getSession(false);
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if (httpSession != null) {
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SessionService.touchSession(httpSession.getId());
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}
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/*
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* logMetacat.debug("Connection pool size: "
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* +connPool.getSizeOfDBConnectionPool(),10); logMetacat.debug("Free
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* DBConnection number: "
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*/
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// If all DBConnection in the pool are free and DBConnection pool
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// size is greater than initial value, shrink the connection pool
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// size to initial value
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DBConnectionPool.shrinkDBConnectionPoolSize();
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// Debug message to print out the method which have a busy DBConnection
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try {
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DBConnectionPool pool = DBConnectionPool.getInstance();
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pool.printMethodNameHavingBusyDBConnection();
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} catch (SQLException sqle) {
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logMetacat.error("WorkflowSchedulerServlet.handleGetOrPost - error getting DBConnectionPool: "
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+ sqle.getMessage());
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sqle.printStackTrace();
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}
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try {
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String name = null;
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String[] value = null;
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Hashtable<String, String[]> params = new Hashtable<String, String[]>();
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Enumeration<String> paramlist =
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(Enumeration<String>) request.getParameterNames();
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while (paramlist.hasMoreElements()) {
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name = paramlist.nextElement();
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value = request.getParameterValues(name);
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params.put(name, value);
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}
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// handle param is emptpy
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if (params.isEmpty() || params == null) {
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return;
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}
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// if the user clicked on the input images, decode which image
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// was clicked then set the action.
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if (params.get("action") == null) {
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PrintWriter out = response.getWriter();
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response.setContentType("text/xml");
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out.println("<?xml version=\"1.0\"?>");
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out.println("<error>");
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out.println("Action not specified");
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out.println("</error>");
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out.close();
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return;
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}
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String action = (params.get("action"))[0];
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logMetacat.info("WorkflowSchedulerServlet.handleGetOrPost - Action is: " + action);
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// This block handles session management for the servlet
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// by looking up the current session information for all actions
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// other than "login" and "logout"
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String userName = null;
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String[] groupNames = null;
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name = null;
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// handle login action
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if (action.equals("login")) {
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// PrintWriter out = response.getWriter();
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// handleLoginAction(out, params, request, response);
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// out.close();
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// handle logout action
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} else if (action.equals("logout")) {
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// PrintWriter out = response.getWriter();
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// handleLogoutAction(out, params, request, response);
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// out.close();
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// handle shrink DBConnection request
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} else if (action.equals("shrink")) {
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PrintWriter out = response.getWriter();
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boolean success = false;
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// If all DBConnection in the pool are free and DBConnection
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// pool
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// size is greater than initial value, shrink the connection
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// pool
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// size to initial value
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success = DBConnectionPool.shrinkConnectionPoolSize();
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if (success) {
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// if successfully shrink the pool size to initial value
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out.println("DBConnection Pool shrunk successfully.");
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}// if
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else {
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out.println("DBConnection pool not shrunk successfully.");
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}
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// close out put
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out.close();
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// aware of session expiration on every request
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} else {
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SessionData sessionData = RequestUtil.getSessionData(request);
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userName = sessionData.getUserName();
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// password = sessionData.getPassword();
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groupNames = sessionData.getGroupNames();
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// sessionId = sessionData.getId();
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logMetacat.info("WorkflowSchedulerServlet.handleGetOrPost - The user is : " + userName);
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}
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if (action.equals("scheduleWorkflow")) {
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try {
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WorkflowScheduler.getInstance().scheduleJob(request, response,
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params);
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return;
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} catch (BaseException be) {
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logMetacat.error("WorkflowSchedulerServlet.handleGetOrPost - error when scheduling"
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+ "workflow", be);
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ResponseUtil.sendErrorXML(response,
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ResponseUtil.SCHEDULE_WORKFLOW_ERROR, be);
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return;
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}
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} else if (action.equals("unscheduleWorkflow")) {
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try {
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WorkflowScheduler.getInstance().unscheduleJob(request, response,
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params, userName, groupNames);
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return;
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} catch (BaseException be) {
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logMetacat.error("WorkflowSchedulerServlet.handleGetOrPost - error when unscheduling"
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+ "workflow", be);
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ResponseUtil.sendErrorXML(response,
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ResponseUtil.UNSCHEDULE_WORKFLOW_ERROR, be);
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return;
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}
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} else if (action.equals("rescheduleWorkflow")) {
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try {
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WorkflowScheduler.getInstance().rescheduleJob(request, response,
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params, userName, groupNames);
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return;
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} catch (BaseException be) {
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logMetacat.error("WorkflowSchedulerServlet.handleGetOrPost - error when rescheduling"
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+ "workflow", be);
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ResponseUtil.sendErrorXML(response,
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ResponseUtil.RESCHEDULE_WORKFLOW_ERROR, be);
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return;
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}
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} else if (action.equals("getScheduledWorkflow")) {
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try {
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WorkflowScheduler.getInstance().getJobs(request, response, params,
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userName, groupNames);
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return;
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} catch (BaseException be) {
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logMetacat.error("WorkflowSchedulerServlet.handleGetOrPost - error when getting"
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+ "scheduled workflows", be);
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ResponseUtil.sendErrorXML(response,
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ResponseUtil.GET_SCHEDULED_WORKFLOW_ERROR, be);
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return;
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}
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} else if (action.equals("deleteScheduledWorkflow")) {
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try {
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WorkflowScheduler.getInstance().deleteJob(request, response, params,
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userName, groupNames);
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return;
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} catch (BaseException be) {
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logMetacat.error("WorkflowSchedulerServlet.handleGetOrPost - error when deleting"
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+ "workflow", be);
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ResponseUtil.sendErrorXML(response,
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ResponseUtil.DELETE_SCHEDULED_WORKFLOW_ERROR, be);
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return;
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}
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} else {
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logMetacat.error("WorkflowSchedulerServlet.handleGetOrPost - unregistered action: "
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+ action);
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PrintWriter out = response.getWriter();
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out.println("<?xml version=\"1.0\"?>");
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out.println("<error>");
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out.println("Error: action not registered. Please report this error.");
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out.println("</error>");
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out.close();
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}
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} catch (ErrorSendingErrorException esee) {
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String errorString = "WorkflowSchedulerServlet.handleGetOrPost - Error sending error message: " + esee.getMessage();
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logMetacat.error(errorString);
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throw new ServletException(errorString);
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}
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}
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397
|
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398
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// // LOGIN & LOGOUT SECTION
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399
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// /**
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400
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// * Handle the login request. Create a new session object. Do user
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401
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// * authentication through the session.
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402
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// */
|
403
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// private void handleLoginAction(PrintWriter out, Hashtable<String, String[]> params,
|
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// HttpServletRequest request, HttpServletResponse response) {
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405
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// Logger logMetacat = Logger.getLogger(WorkflowSchedulerServlet.class);
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406
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// AuthSession sess = null;
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407
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//
|
408
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// if(params.get("username") == null){
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409
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// response.setContentType("text/xml");
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410
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// out.println("<?xml version=\"1.0\"?>");
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411
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// out.println("<error>");
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412
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// out.println("Username not specified");
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413
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// out.println("</error>");
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414
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// return;
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415
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// }
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416
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//
|
417
|
// // }
|
418
|
//
|
419
|
// if(params.get("password") == null){
|
420
|
// response.setContentType("text/xml");
|
421
|
// out.println("<?xml version=\"1.0\"?>");
|
422
|
// out.println("<error>");
|
423
|
// out.println("Password not specified");
|
424
|
// out.println("</error>");
|
425
|
// return;
|
426
|
// }
|
427
|
//
|
428
|
// String un = (params.get("username"))[0];
|
429
|
// logMetacat.info("user " + un + " is trying to login");
|
430
|
// String pw = (params.get("password"))[0];
|
431
|
//
|
432
|
// String qformat = "xml";
|
433
|
// if(params.get("qformat") != null){
|
434
|
// qformat = (params.get("qformat"))[0];
|
435
|
// }
|
436
|
//
|
437
|
// try {
|
438
|
// sess = new AuthSession();
|
439
|
// } catch (Exception e) {
|
440
|
// String errorMsg = "Problem in WorkflowSchedulerServlet.handleLoginAction() authenicating session: "
|
441
|
// + e.getMessage();
|
442
|
// logMetacat.error(errorMsg);
|
443
|
// out.println(errorMsg);
|
444
|
// return;
|
445
|
// }
|
446
|
// boolean isValid = sess.authenticate(request, un, pw);
|
447
|
//
|
448
|
// //if it is authernticate is true, store the session
|
449
|
// if (isValid) {
|
450
|
// HttpSession session = sess.getSessions();
|
451
|
// String id = session.getId();
|
452
|
// logMetacat.debug("Store session id " + id
|
453
|
// + " which has username" + session.getAttribute("username")
|
454
|
// + " into hash in login method");
|
455
|
// try {
|
456
|
// SessionService.registerSession(id, (String) session
|
457
|
// .getAttribute("username"), (String[]) session
|
458
|
// .getAttribute("groupnames"), (String) session
|
459
|
// .getAttribute("password"));
|
460
|
// } catch (ServiceException se) {
|
461
|
// String errorMsg = "Problem in WorkflowSchedulerServlet.handleLoginAction() registering session: "
|
462
|
// + se.getMessage();
|
463
|
// logMetacat.error(errorMsg);
|
464
|
// out.println(errorMsg);
|
465
|
// return;
|
466
|
// }
|
467
|
// }
|
468
|
//
|
469
|
// // format and transform the output
|
470
|
// if (qformat.equals("xml")) {
|
471
|
// response.setContentType("text/xml");
|
472
|
// out.println(sess.getMessage());
|
473
|
// } else {
|
474
|
// try {
|
475
|
// DBTransform trans = new DBTransform();
|
476
|
// response.setContentType("text/html");
|
477
|
// trans.transformXMLDocument(sess.getMessage(),
|
478
|
// "-//NCEAS//login//EN", "-//W3C//HTML//EN", qformat,
|
479
|
// out, null, null);
|
480
|
// } catch (Exception e) {
|
481
|
// logMetacat.error("Error in WorkflowSchedulerServlet.handleLoginAction: "
|
482
|
// + e.getMessage());
|
483
|
// }
|
484
|
// }
|
485
|
// }
|
486
|
//
|
487
|
// /**
|
488
|
// * Handle the logout request. Close the connection.
|
489
|
// */
|
490
|
// private void handleLogoutAction(PrintWriter out, Hashtable<String, String[]> params,
|
491
|
// HttpServletRequest request, HttpServletResponse response) {
|
492
|
// Logger logMetacat = Logger.getLogger(WorkflowSchedulerServlet.class);
|
493
|
// String qformat = "xml";
|
494
|
// if(params.get("qformat") != null){
|
495
|
// qformat = params.get("qformat")[0];
|
496
|
// }
|
497
|
//
|
498
|
// // close the connection
|
499
|
// HttpSession sess = request.getSession(false);
|
500
|
// logMetacat.info("After get session in logout request");
|
501
|
// if (sess != null) {
|
502
|
// logMetacat.info("The session id " + sess.getId()
|
503
|
// + " will be invalidate in logout action");
|
504
|
// logMetacat.info("The session contains user "
|
505
|
// + sess.getAttribute("username")
|
506
|
// + " will be invalidate in logout action");
|
507
|
// sess.invalidate();
|
508
|
// SessionService.unRegisterSession(sess.getId());
|
509
|
// }
|
510
|
//
|
511
|
// // produce output
|
512
|
// StringBuffer output = new StringBuffer();
|
513
|
// output.append("<?xml version=\"1.0\"?>");
|
514
|
// output.append("<logout>");
|
515
|
// output.append("User logged out");
|
516
|
// output.append("</logout>");
|
517
|
//
|
518
|
// //format and transform the output
|
519
|
// if (qformat.equals("xml")) {
|
520
|
// response.setContentType("text/xml");
|
521
|
// out.println(output.toString());
|
522
|
// } else {
|
523
|
// try {
|
524
|
// DBTransform trans = new DBTransform();
|
525
|
// response.setContentType("text/html");
|
526
|
// trans.transformXMLDocument(output.toString(),
|
527
|
// "-//NCEAS//login//EN", "-//W3C//HTML//EN", qformat,
|
528
|
// out, null, null);
|
529
|
// } catch (Exception e) {
|
530
|
// logMetacat.error(
|
531
|
// "Error in WorkflowSchedulerServlet.handleLogoutAction"
|
532
|
// + e.getMessage());
|
533
|
// }
|
534
|
// }
|
535
|
// }
|
536
|
}
|