| career | drupal | java | mac | mysql | perl | scala | uml | unix  

JMeter example source code file (

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

Java - JMeter tags/keywords

awt, border, borderlayout, box, event, graph, gui, image, jcheckbox, jcheckbox, jlabel, jpanel, jpanel, jtextfield, jtextfield, non-nls-1, non-nls-1, string, swing, text

The JMeter 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.jmeter.visualizers;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Image;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.text.NumberFormat;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;

import org.apache.jmeter.gui.util.JMeterColor;
import org.apache.jmeter.samplers.Clearable;
import org.apache.jmeter.samplers.SampleResult;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jmeter.visualizers.gui.AbstractVisualizer;

 * This class implements a statistical analyser that calculates both the average
 * and the standard deviation of the sampling process and outputs them as
 * autoscaling plots.
 * Created February 8, 2001
public class GraphVisualizer extends AbstractVisualizer implements ImageVisualizer, ItemListener, Clearable {

    private static final long serialVersionUID = 240L;

    private static final String ZERO = "0";  //$NON-NLS-1$

    private NumberFormat nf = NumberFormat.getInstance(); // OK, because used in synchronised method

    private CachingStatCalculator model;

    private JTextField maxYField = null;

    private JTextField minYField = null;

    private JTextField noSamplesField = null;

    private String minute = JMeterUtils.getResString("minute"); // $NON-NLS-1$

    private Graph graph;

    private JCheckBox data;

    private JCheckBox average;

    private JCheckBox deviation;

    private JCheckBox throughput;

    private JCheckBox median;

    private JTextField dataField;

    private JTextField averageField;

    private JTextField deviationField;

    private JTextField throughputField;

    private JTextField medianField;

     * Constructor for the GraphVisualizer object.
    public GraphVisualizer() {
        model = new CachingStatCalculator("Graph");
        graph = new Graph(model);

     * Gets the Image attribute of the GraphVisualizer object.
     * @return the Image value
    public Image getImage() {
        Image result = graph.createImage(graph.getWidth(), graph.getHeight());


        return result;

    public synchronized void updateGui(Sample s) {
        // We have received one more sample
        throughputField.setText(nf.format(60 * s.getThroughput()) + "/" + minute); // $NON-NLS-1$

    public void add(SampleResult res) {

    public String getLabelResource() {
        return "graph_results_title"; // $NON-NLS-1$

    public void itemStateChanged(ItemEvent e) {
        if (e.getItem() == data) {
            this.graph.enableData(e.getStateChange() == ItemEvent.SELECTED);
        } else if (e.getItem() == average) {
            this.graph.enableAverage(e.getStateChange() == ItemEvent.SELECTED);
        } else if (e.getItem() == deviation) {
            this.graph.enableDeviation(e.getStateChange() == ItemEvent.SELECTED);
        } else if (e.getItem() == throughput) {
            this.graph.enableThroughput(e.getStateChange() == ItemEvent.SELECTED);
        } else if (e.getItem() == median) {
            this.graph.enableMedian(e.getStateChange() == ItemEvent.SELECTED);

    public void clearData() {
        throughputField.setText("0/" + minute); //$NON-NLS-1$

    public String toString() {
        return "Show the samples analysis as dot plots";

     * Update the max and min value of the Y axis.
    private void updateYAxis() {

     * Initialize the GUI.
    private void init() {
        this.setLayout(new BorderLayout());

        // MAIN PANEL
        Border margin = new EmptyBorder(10, 10, 5, 10);


        // Set up the graph with header, footer, Y axis and graph display
        JPanel graphPanel = new JPanel(new BorderLayout());
        graphPanel.add(createYAxis(), BorderLayout.WEST);
        graphPanel.add(createChoosePanel(), BorderLayout.NORTH);
        graphPanel.add(createGraphPanel(), BorderLayout.CENTER);
        graphPanel.add(createGraphInfoPanel(), BorderLayout.SOUTH);

        // Add the main panel and the graph
        this.add(makeTitlePanel(), BorderLayout.NORTH);
        this.add(graphPanel, BorderLayout.CENTER);

    // Methods used in creating the GUI

     * Creates the panel containing the graph's Y axis labels.
     * @return the Y axis panel
    private JPanel createYAxis() {
        JPanel graphYAxisPanel = new JPanel();

        graphYAxisPanel.setLayout(new BorderLayout());

        maxYField = createYAxisField(5);
        minYField = createYAxisField(3);

        graphYAxisPanel.add(createYAxisPanel("graph_results_ms", maxYField), BorderLayout.NORTH); // $NON-NLS-1$
        graphYAxisPanel.add(createYAxisPanel("graph_results_ms", minYField), BorderLayout.SOUTH); // $NON-NLS-1$

        return graphYAxisPanel;

     * Creates a text field to be used for the value of a Y axis label. These
     * fields hold the minimum and maximum values for the graph. The units are
     * kept in a separate label outside of this field.
     * @param length
     *            the number of characters which the field will use to calculate
     *            its preferred width. This should be set to the maximum number
     *            of digits that are expected to be necessary to hold the label
     *            value.
     * @see #createYAxisPanel(String, JTextField)
     * @return a text field configured to be used in the Y axis
    private JTextField createYAxisField(int length) {
        JTextField field = new JTextField(length);
        field.setBorder(BorderFactory.createEmptyBorder(0, 10, 0, 0));
        return field;

     * Creates a panel for an entire Y axis label. This includes the dynamic
     * value as well as the unit label.
     * @param labelResourceName
     *            the name of the label resource. This is used to look up the
     *            label text using {@link JMeterUtils#getResString(String)}.
     * @return a panel containing both the dynamic and static parts of a Y axis
     *         label
    private JPanel createYAxisPanel(String labelResourceName, JTextField field) {
        JPanel panel = new JPanel(new FlowLayout());
        JLabel label = new JLabel(JMeterUtils.getResString(labelResourceName));

        return panel;

     * Creates a panel which allows the user to choose which graphs to display.
     * This panel consists of a check box for each type of graph (current
     * sample, average, deviation, and throughput).
     * @return a panel allowing the user to choose which graphs to display
    private JPanel createChoosePanel() {
        JPanel chooseGraphsPanel = new JPanel();

        chooseGraphsPanel.setLayout(new FlowLayout());
        JLabel selectGraphsLabel = new JLabel(JMeterUtils.getResString("graph_choose_graphs")); //$NON-NLS-1$
        data = createChooseCheckBox("graph_results_data",; // $NON-NLS-1$
        average = createChooseCheckBox("graph_results_average",; // $NON-NLS-1$
        deviation = createChooseCheckBox("graph_results_deviation",; // $NON-NLS-1$
        throughput = createChooseCheckBox("graph_results_throughput", JMeterColor.dark_green); // $NON-NLS-1$
        median = createChooseCheckBox("graph_results_median", JMeterColor.purple); // $NON-NLS-1$

        return chooseGraphsPanel;

     * Creates a check box configured to be used to in the choose panel allowing
     * the user to select whether or not a particular kind of graph data will be
     * displayed.
     * @param labelResourceName
     *            the name of the label resource. This is used to look up the
     *            label text using {@link JMeterUtils#getResString(String)}.
     * @param color
     *            the color used for the checkbox text. By convention this is
     *            the same color that is used to draw the graph and for the
     *            corresponding info field.
     * @return a checkbox allowing the user to select whether or not a kind of
     *         graph data will be displayed
    private JCheckBox createChooseCheckBox(String labelResourceName, Color color) {
        JCheckBox checkBox = new JCheckBox(JMeterUtils.getResString(labelResourceName));
        return checkBox;

     * Creates a scroll pane containing the actual graph of the results.
     * @return a scroll pane containing the graph
    private Component createGraphPanel() {
        JScrollPane graphScrollPanel = makeScrollPane(graph, JScrollPane.VERTICAL_SCROLLBAR_NEVER,
        graphScrollPanel.setViewportBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));

        return graphScrollPanel;

     * Creates a panel which numerically displays the current graph values.
     * @return a panel showing the current graph values
    private Box createGraphInfoPanel() {
        Box graphInfoPanel = Box.createHorizontalBox();

        noSamplesField = createInfoField(, 6);
        dataField = createInfoField(, 5);
        averageField = createInfoField(, 5);
        deviationField = createInfoField(, 5);
        throughputField = createInfoField(JMeterColor.dark_green, 15);
        medianField = createInfoField(JMeterColor.purple, 5);

        graphInfoPanel.add(createInfoColumn(createInfoLabel("graph_results_no_samples", noSamplesField), // $NON-NLS-1$
                noSamplesField, createInfoLabel("graph_results_deviation", deviationField), deviationField)); // $NON-NLS-1$

        graphInfoPanel.add(createInfoColumn(createInfoLabel("graph_results_latest_sample", dataField), dataField, // $NON-NLS-1$
                createInfoLabel("graph_results_throughput", throughputField), throughputField)); // $NON-NLS-1$

        graphInfoPanel.add(createInfoColumn(createInfoLabel("graph_results_average", averageField), averageField, // $NON-NLS-1$
                createInfoLabel("graph_results_median", medianField), medianField)); // $NON-NLS-1$
        return graphInfoPanel;

     * Creates one of the fields used to display the graph's current values.
     * @param color
     *            the color used to draw the value. By convention this is the
     *            same color that is used to draw the graph for this value and
     *            in the choose panel.
     * @param length
     *            the number of digits which the field should be able to display
     * @return a text field configured to display one of the current graph
     *         values
    private JTextField createInfoField(Color color, int length) {
        JTextField field = new JTextField(length);
        field.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));

        // The text field should expand horizontally, but have
        // a fixed height
        field.setMaximumSize(new Dimension(field.getMaximumSize().width, field.getPreferredSize().height));
        return field;

     * Creates a label for one of the fields used to display the graph's current
     * values. Neither the label created by this method or the
     * <code>field passed as a parameter is added to the GUI here.
     * @param labelResourceName
     *            the name of the label resource. This is used to look up the
     *            label text using {@link JMeterUtils#getResString(String)}.
     * @param field
     *            the field this label is being created for.
    private JLabel createInfoLabel(String labelResourceName, JTextField field) {
        JLabel label = new JLabel(JMeterUtils.getResString(labelResourceName));
        return label;

     * Creates a panel containing two pairs of labels and fields for displaying
     * the current graph values. This method exists to help with laying out the
     * fields in columns. If one or more components are null then these
     * components will be represented by blank space.
     * @param label1
     *            the label for the first field. This label will be placed in
     *            the upper left section of the panel. If this parameter is
     *            null, this section of the panel will be left blank.
     * @param field1
     *            the field corresponding to the first label. This field will be
     *            placed in the upper right section of the panel. If this
     *            parameter is null, this section of the panel will be left
     *            blank.
     * @param label2
     *            the label for the second field. This label will be placed in
     *            the lower left section of the panel. If this parameter is
     *            null, this section of the panel will be left blank.
     * @param field2
     *            the field corresponding to the second label. This field will
     *            be placed in the lower right section of the panel. If this
     *            parameter is null, this section of the panel will be left
     *            blank.
    private Box createInfoColumn(JLabel label1, JTextField field1, JLabel label2, JTextField field2) {
        // This column actually consists of a row with two sub-columns
        // The first column contains the labels, and the second
        // column contains the fields.
        Box row = Box.createHorizontalBox();
        Box col = Box.createVerticalBox();
        col.add(label1 != null ? label1 : Box.createVerticalGlue());
        col.add(label2 != null ? label2 : Box.createVerticalGlue());


        col = Box.createVerticalBox();
        col.add(field1 != null ? field1 : Box.createVerticalGlue());
        col.add(field2 != null ? field2 : Box.createVerticalGlue());


        return row;


Other JMeter examples (source code examples)

Here is a short list of links related to this JMeter source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller


new blog posts


Copyright 1998-2021 Alvin Alexander,
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.