JMeter example source code file (LineChart.java)

This example JMeter source code file (LineChart.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - JMeter tags/keywords

arraylist, arraylist, awt, dataset, dimension, gui, image, jcomponent, linechart, linegraph, non-nls-1, shape, shape, string, string, stroke, stroke, swing, util

The JMeter LineChart.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.jmeter.testelement;

import java.awt.BasicStroke;
import java.awt.Dimension;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.swing.JComponent;

import org.apache.jmeter.report.DataSet;
import org.apache.jmeter.visualizers.LineGraph;
import org.apache.jmeter.visualizers.SamplingStatCalculator;
import org.jCharts.properties.PointChartProperties;

public class LineChart extends AbstractChart {

    private static final long serialVersionUID = 240L;

    private static final String URL_DELIM = ","; //$NON-NLS-1$
    private static final String REPORT_CHART_URLS = "ReportChart.chart.urls"; //$NON-NLS-1$
    private static final Shape[] SHAPE_ARRAY = {PointChartProperties.SHAPE_CIRCLE,
            PointChartProperties.SHAPE_DIAMOND,PointChartProperties.SHAPE_SQUARE,
            PointChartProperties.SHAPE_TRIANGLE};

    private int shape_counter = 0;

    public LineChart() {
        super();
    }

    public String getURLs() {
        return getPropertyAsString(REPORT_CHART_URLS);
    }

    public void setURLs(String urls) {
        setProperty(REPORT_CHART_URLS,urls);
    }

    private double[][] convertToDouble(List<DataSet> data) {
        String[] urls = this.getURLs().split(URL_DELIM);
        double[][] dataset = new double[urls.length][data.size()];
        for (int idx=0; idx < urls.length; idx++) {
            for (int idz=0; idz < data.size(); idz++) {
                DataSet dset = data.get(idz);
                SamplingStatCalculator ss = dset.getStatistics(urls[idx]);
                dataset[idx][idz] = getValue(ss);
            }
        }
        return dataset;
    }

    @Override
    public JComponent renderChart(List<DataSet> dataset) {
        ArrayList<DataSet> dset = new ArrayList();
        ArrayList<String> xlabels = new ArrayList();
        Iterator<DataSet> itr = dataset.iterator();
        while (itr.hasNext()) {
            DataSet item = itr.next();
            if (item != null) {
                // we add the entry
                dset.add(item);
                if ( getXLabel().equals(X_DATA_FILENAME_LABEL) ) {
                    xlabels.add(item.getDataSourceName());
                } else {
                    xlabels.add(item.getMonthDayYearDate());
                }
            }
        }
        double[][] dbset = convertToDouble(dset);
        return renderGraphics(dbset, xlabels.toArray(new String[xlabels.size()]));
    }

    public JComponent renderGraphics(double[][] data, String[] xAxisLabels) {
        LineGraph panel = new LineGraph();
        panel.setTitle(this.getTitle());
        panel.setData(data);
        panel.setXAxisLabels(xAxisLabels);
        panel.setYAxisLabels(this.getURLs().split(URL_DELIM));
        panel.setXAxisTitle(this.getFormattedXAxis());
        panel.setYAxisTitle(this.getYAxis());
        // we should make this configurable eventually
        int _width = getWidth();
        int _height = getHeight();
        panel.setPreferredSize(new Dimension(_width,_height));
        panel.setSize(new Dimension(_width,_height));
        panel.setWidth(_width);
        panel.setHeight(_width);
        setBufferedImage(new BufferedImage(_width,_height,BufferedImage.TYPE_INT_RGB));
        panel.paintComponent(this.getBufferedImage().createGraphics());
        return panel;
    }

    /**
     * Since we only have 4 shapes, the method will start with the
     * first shape and keep cycling through the shapes in order.
     * @param count
     * @return array of shapes
     */
    public Shape[] createShapes(int count) {
        Shape[] shapes = new Shape[count];
        for (int idx=0; idx < count; idx++) {
            shapes[idx] = nextShape();
        }
        return shapes;
    }

    /**
     * Return the next shape
     * @return the shape
     */
    public Shape nextShape() {
        if (shape_counter >= (SHAPE_ARRAY.length - 1)) {
            shape_counter = 0;
        }
        return SHAPE_ARRAY[shape_counter];
    }

    /**
     *
     * @param count
     * @return array of strokes
     */
    public Stroke[] createStrokes(int count) {
        Stroke[] str = new Stroke[count];
        for (int idx=0; idx < count; idx++) {
            str[idx] = nextStroke();
        }
        return str;
    }

    public Stroke nextStroke() {
        return new BasicStroke(1.5f);
    }
}