Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package org.miloss.fgsms.services.rs.impl.reports.broker; import java.io.File; import java.io.IOException; import java.io.OutputStreamWriter; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import java.util.GregorianCalendar; import java.util.List; import javax.xml.ws.WebServiceContext; import org.apache.log4j.Level; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.data.category.DefaultCategoryDataset; import org.jfree.data.time.Millisecond; import org.jfree.data.time.TimeSeries; import org.jfree.data.time.TimeSeriesCollection; import org.miloss.fgsms.common.DBUtils; import org.miloss.fgsms.common.UserIdentityUtil; import org.miloss.fgsms.common.Utility; import org.miloss.fgsms.services.interfaces.common.PolicyType; import org.miloss.fgsms.services.interfaces.common.SecurityWrapper; import org.miloss.fgsms.services.interfaces.common.TimeRange; import static org.miloss.fgsms.services.rs.impl.Reporting.getFilePathDelimitor; import org.miloss.fgsms.services.rs.impl.reports.BaseReportGenerator; /** * * @author AO */ public class QueueDepth extends BaseReportGenerator { @Override public String GetDisplayName() { return "Message Broker Queue Depth"; } @Override public String GetHtmlFormattedHelp() { return "This represents the average queue depth of all channels (topics/queues/etc) on a specific message broker. An increase or high " + "rate can indicate that a subscriber is offline or non-functional. For chart, X axis is time, Y is queue depth"; } @Override public List<PolicyType> GetAppliesTo() { ArrayList<PolicyType> ret = new ArrayList<PolicyType>(); ret.add(PolicyType.STATISTICAL); return ret; } @Override public void generateReport(OutputStreamWriter data, List<String> urls, String path, List<String> files, TimeRange range, String currentuser, SecurityWrapper classification, WebServiceContext ctx) throws IOException { Connection con = Utility.getPerformanceDBConnection(); try { PreparedStatement cmd = null; ResultSet rs = null; DefaultCategoryDataset set = new DefaultCategoryDataset(); JFreeChart chart = null; data.append("<hr /><h2>").append(GetDisplayName()).append("</h2>"); data.append(GetHtmlFormattedHelp() + "<br />"); data.append("<table class=\"table table-hover\"><tr><th>URI</th><th>Channel</th><th>Depth</th></tr>"); TimeSeriesCollection col = new TimeSeriesCollection(); for (int i = 0; i < urls.size(); i++) { if (!isPolicyTypeOf(urls.get(i), PolicyType.STATISTICAL)) { continue; } //https://github.com/mil-oss/fgsms/issues/112 if (!UserIdentityUtil.hasReadAccess(currentuser, "getReport", urls.get(i), classification, ctx)) { continue; } String url = Utility.encodeHTML(getPolicyDisplayName(urls.get(i))); double average = 0; data.append("<tr><td>").append(url).append("</td>"); try { cmd = con.prepareStatement( "select avg(queuedepth), host, canonicalname from brokerhistory where host=? and utcdatetime > ? and utcdatetime < ? group by canonicalname, host;"); cmd.setString(1, urls.get(i)); cmd.setLong(2, range.getStart().getTimeInMillis()); cmd.setLong(3, range.getEnd().getTimeInMillis()); rs = cmd.executeQuery(); if (rs.next()) { average = rs.getDouble(1); } } catch (Exception ex) { log.log(Level.ERROR, "Error opening or querying the database.", ex); } finally { DBUtils.safeClose(rs); DBUtils.safeClose(cmd); } data.append("<td>").append(average + "").append("</td>"); TimeSeries ts = new TimeSeries(url, Millisecond.class); try { //ok now get the raw data.... cmd = con.prepareStatement( "select utcdatetime,queuedepth, canonicalname from brokerhistory where host=? and utcdatetime > ? and utcdatetime < ?;"); cmd.setString(1, urls.get(i)); cmd.setLong(2, range.getStart().getTimeInMillis()); cmd.setLong(3, range.getEnd().getTimeInMillis()); rs = cmd.executeQuery(); while (rs.next()) { //set.addValue(rs.getLong(1), urls.get(i), rs.getString("canonicalname")); GregorianCalendar gcal = new GregorianCalendar(); gcal.setTimeInMillis(rs.getLong(1)); Millisecond m = new Millisecond(gcal.getTime()); //TimeSeriesDataItem t = new TimeSeriesDataItem(m, rs.getLong(2)); //ts.add(t); ts.addOrUpdate(m, rs.getLong(2)); } } catch (Exception ex) { log.log(Level.ERROR, "Error opening or querying the database.", ex); } finally { DBUtils.safeClose(rs); DBUtils.safeClose(cmd); } col.addSeries(ts); } chart = org.jfree.chart.ChartFactory.createTimeSeriesChart(GetDisplayName(), "Timestamp", "Count", col, true, false, false); data.append("</table>"); try { // if (set.getRowCount() != 0) { ChartUtilities.saveChartAsPNG(new File( path + getFilePathDelimitor() + "image_" + this.getClass().getSimpleName() + ".png"), chart, 1500, 400); data.append("<img src=\"image_").append(this.getClass().getSimpleName()).append(".png\">"); files.add(path + getFilePathDelimitor() + "image_" + this.getClass().getSimpleName() + ".png"); // } } catch (IOException ex) { log.log(Level.ERROR, "Error saving chart image for request", ex); } } catch (Exception ex) { log.log(Level.ERROR, null, ex); } finally { DBUtils.safeClose(con); } } }