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/* Copyright (c) 2011 Peter Troshin
*
* JAva Bioinformatics Analysis Web Services (JABAWS) @version: 2.0
*
* This library is free software; you can redistribute it and/or modify it under the terms of the
* Apache License version 2 as published by the Apache Software Foundation
*
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Apache
* License for more details.
*
* A copy of the license is in apache_license.txt. It is also available here:
* @see: http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Any republication or derived work distributed in source code form
* must include this copyright and license notice.
*/
package compbio.stat.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.sql.SQLException;
import java.util.Date;
import java.util.Map;
import java.util.Calendar;
import java.text.SimpleDateFormat;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import compbio.engine.conf.PropertyHelperManager;
import compbio.stat.collector.StatDB;
import compbio.stat.servlet.util.*;
import compbio.util.PropertyHelper;
import compbio.util.Util;
import org.apache.log4j.Logger;
public class AnnualStat extends HttpServlet {
private static final Logger log = Logger.getLogger(AnnualStat.class);
private static PropertyHelper ph = PropertyHelperManager.getPropertyHelper();
private final Scheduler scheduler = new Scheduler();
private static int getIntProperty(String propValue) {
int value = 0;
if (!Util.isEmpty(propValue)) {
propValue = propValue.trim();
value = Integer.parseInt(propValue);
}
return value;
}
static int refreshUsageStatsFrequency() {
return getIntProperty(ph.getProperty("local.usage.stats.refresh.frequency"));
}
@Override
public void init() {
// startup the scheduler with current time
int hour = Calendar.getInstance().get(Calendar.HOUR_OF_DAY);
int min = Calendar.getInstance().get(Calendar.MINUTE);
int sec = Calendar.getInstance().get(Calendar.SECOND);
// refresh sleep time (in between requests) - minutes
final int refresh_freq = refreshUsageStatsFrequency();
scheduler.schedule(new SchedulerTask() {
public void run() {
refreshCache();
}
private void refreshCache() {
hitEndpointForRefresh();
log.info("Refreshing the In Memory Cache...");
log.info(String.format("Refreshing again in %d minutes", refresh_freq));
}
}, new RefreshIterator(hour, min, sec, refresh_freq));
}
public void clearContextCache() {
// try remove the current values from the context
try {
this.getServletConfig().getServletContext().removeAttribute("usageStatsResults");
this.getServletConfig().getServletContext().removeAttribute("usageStatsTimestamp");
this.getServletConfig().getServletContext().removeAttribute("usageStatsStart");
this.getServletConfig().getServletContext().removeAttribute("usageStatsEnd");
log.info("In Memory Cache Cleared!");
} catch (Exception e) {
log.warn("In Memory Cache Not Cleared. Perhaps not available yet!");
}
}
private void hitEndpointForRefresh() {
String endpointURL;
endpointURL = (String) this.getServletConfig().getServletContext().getAttribute("usageStatsURL");
if (endpointURL != null){
try {
URL url = new URL(endpointURL);
System.out.println(endpointURL);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestProperty("User-Agent", "JABAWS Usage Stats Refreshing the Context Cache");
int status = connection.getResponseCode();
log.info(String.format("Hitting %s with an internal user-agent! status code: %s",
endpointURL, status));
} catch (IOException e) {
log.warn("Something wrong when hitting " + endpointURL);
log.warn(e);
}
}
}
public Map<Date, Totals> checkMonthlyTotals(HttpServletResponse resp) throws ServletException, IOException {
try {
System.out.println("Updating the Usage Stats In Memory Cache...");
StatDB db = new StatDB();
Date earliestRec = db.getEarliestRecord();
if (earliestRec == null) {
PrintWriter writer = resp.getWriter();
writer.println("No statistics found in the database. Please allow "
+ "at least one hour after a server start for the statistics "
+ "collector to collect the data. ");
writer.close();
return null;
}
return StatCollection.getStats(earliestRec);
} catch (SQLException e) {
e.printStackTrace();
throw new ServletException(e);
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
Map<Date, Totals> monthlyTotals;
String timeStamp = new String();
long startTime;
long endTime;
String refresh_freq;
// save the main caller URL in the context
String url = new String();
url = req.getRequestURL().toString();
System.out.println("UR: " + url);
this.getServletConfig().getServletContext().setAttribute("usageStatsURL", url);
// check user-agent: this is a trick to get the cache refreshed periodically
String useragent = new String();
useragent = req.getHeader("user-agent");
// check if there are values available in the context
if (this.getServletConfig().getServletContext().getAttribute("usageStatsResults") == null ||
useragent.equals("JABAWS Usage Stats Refreshing the Context Cache")) {
// get stats from db
startTime = System.nanoTime();
monthlyTotals = checkMonthlyTotals(resp);
endTime = System.nanoTime();
if (monthlyTotals != null) {
// try clear the previous values if any
clearContextCache();
// add the current values to the context
this.getServletConfig().getServletContext().setAttribute("usageStatsResults", monthlyTotals);
timeStamp = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(
Calendar.getInstance().getTime());
this.getServletConfig().getServletContext().setAttribute("usageStatsTimestamp", timeStamp);
this.getServletConfig().getServletContext().setAttribute("usageStatsStart", startTime);
this.getServletConfig().getServletContext().setAttribute("usageStatsEnd", endTime);
refresh_freq = String.valueOf(refreshUsageStatsFrequency());
this.getServletConfig().getServletContext().setAttribute("usageStatsRefreshFreq", refresh_freq);
} else {
return;
}
} else {
// get last results available
monthlyTotals = (Map<Date, Totals>) this.getServletConfig().getServletContext().getAttribute("usageStatsResults");
timeStamp = (String) this.getServletConfig().getServletContext().getAttribute("usageStatsTimestamp");
startTime = (Long) this.getServletConfig().getServletContext().getAttribute("usageStatsStart");
endTime = (Long) this.getServletConfig().getServletContext().getAttribute("usageStatsEnd");
refresh_freq = (String) this.getServletConfig().getServletContext().getAttribute("usageStatsRefreshFreq");
}
req.setAttribute("stat", monthlyTotals);
req.setAttribute("total", Totals.sumOfTotals(monthlyTotals));
req.setAttribute("timeexec", (endTime - startTime) / 1000000000);
req.setAttribute("timestamp", timeStamp);
req.setAttribute("refreshfreq", refresh_freq);
RequestDispatcher dispatcher = req.getRequestDispatcher("statpages/MonthlySummary.jsp");
req.setAttribute("isAdmin", isAdmin(req));
dispatcher.forward(req, resp);
}
static boolean isAdmin(final HttpServletRequest request) {
return request.isUserInRole("admin");
}
}
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