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/*
This file is part of Subsonic.
Subsonic is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Subsonic 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package net.sourceforge.subsonic.controller;
import net.sourceforge.subsonic.domain.*;
import net.sourceforge.subsonic.service.*;
import org.jfree.chart.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.plot.*;
import org.jfree.chart.renderer.xy.*;
import org.jfree.data.*;
import org.jfree.data.time.*;
import org.springframework.web.servlet.*;
import javax.servlet.http.*;
import java.awt.*;
import java.util.*;
import java.util.List;
/**
* Controller for generating a chart showing bitrate vs time.
*
* @author Sindre Mehus
*/
public class StatusChartController extends AbstractChartController {
private StatusService statusService;
public static final int IMAGE_WIDTH = 350;
public static final int IMAGE_HEIGHT = 150;
public synchronized ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
String type = request.getParameter("type");
int index = Integer.parseInt(request.getParameter("index"));
List<TransferStatus> statuses = Collections.emptyList();
if ("stream".equals(type)) {
statuses = statusService.getAllStreamStatuses();
} else if ("download".equals(type)) {
statuses = statusService.getAllDownloadStatuses();
} else if ("upload".equals(type)) {
statuses = statusService.getAllUploadStatuses();
}
if (index < 0 || index >= statuses.size()) {
return null;
}
TransferStatus status = statuses.get(index);
TimeSeries series = new TimeSeries("Kbps", Millisecond.class);
TransferStatus.SampleHistory history = status.getHistory();
long to = System.currentTimeMillis();
long from = to - status.getHistoryLengthMillis();
Range range = new DateRange(from, to);
if (!history.isEmpty()) {
TransferStatus.Sample previous = history.get(0);
for (int i = 1; i < history.size(); i++) {
TransferStatus.Sample sample = history.get(i);
long elapsedTimeMilis = sample.getTimestamp() - previous.getTimestamp();
long bytesStreamed = Math.max(0L, sample.getBytesTransfered() - previous.getBytesTransfered());
double kbps = (8.0 * bytesStreamed / 1024.0) / (elapsedTimeMilis / 1000.0);
series.addOrUpdate(new Millisecond(new Date(sample.getTimestamp())), kbps);
previous = sample;
}
}
// Compute moving average.
series = MovingAverage.createMovingAverage(series, "Kbps", 20000, 5000);
// Find min and max values.
double min = 100;
double max = 250;
for (Object obj : series.getItems()) {
TimeSeriesDataItem item = (TimeSeriesDataItem) obj;
double value = item.getValue().doubleValue();
if (item.getPeriod().getFirstMillisecond() > from) {
min = Math.min(min, value);
max = Math.max(max, value);
}
}
// Add 10% to max value.
max *= 1.1D;
// Subtract 10% from min value.
min *= 0.9D;
TimeSeriesCollection dataset = new TimeSeriesCollection();
dataset.addSeries(series);
JFreeChart chart = ChartFactory.createTimeSeriesChart(null, null, null, dataset, false, false, false);
XYPlot plot = (XYPlot) chart.getPlot();
plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);
Paint background = new GradientPaint(0, 0, Color.lightGray, 0, IMAGE_HEIGHT, Color.white);
plot.setBackgroundPaint(background);
XYItemRenderer renderer = plot.getRendererForDataset(dataset);
renderer.setSeriesPaint(0, Color.blue.darker());
renderer.setSeriesStroke(0, new BasicStroke(2f));
// Set theme-specific colors.
Color bgColor = getBackground(request);
Color fgColor = getForeground(request);
chart.setBackgroundPaint(bgColor);
ValueAxis domainAxis = plot.getDomainAxis();
domainAxis.setRange(range);
domainAxis.setTickLabelPaint(fgColor);
domainAxis.setTickMarkPaint(fgColor);
domainAxis.setAxisLinePaint(fgColor);
ValueAxis rangeAxis = plot.getRangeAxis();
rangeAxis.setRange(new Range(min, max));
rangeAxis.setTickLabelPaint(fgColor);
rangeAxis.setTickMarkPaint(fgColor);
rangeAxis.setAxisLinePaint(fgColor);
ChartUtilities.writeChartAsPNG(response.getOutputStream(), chart, IMAGE_WIDTH, IMAGE_HEIGHT);
return null;
}
public void setStatusService(StatusService statusService) {
this.statusService = statusService;
}
}
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