JMeter example source code file (MonitorGraph.java)

This example JMeter source code file (MonitorGraph.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

awt, clearable, deprecated, graphics, gui, iterator, jcomponent, jcomponent, list, monitoraccummodel, monitorgraph, monitorgraph, monitorguilistener, monitormodel, monitormodel, override, swing, util

The JMeter MonitorGraph.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.visualizers;

import java.awt.Color;
import java.awt.Graphics;
import java.util.Iterator;
import java.util.List;

import javax.swing.JComponent;

import org.apache.jmeter.samplers.Clearable;

/**
 * MonitorGraph will draw the performance history of a given server. It displays
 * 4 lines:
 * <p>
 */
public class MonitorGraph extends JComponent implements MonitorGuiListener, Clearable {

    private static final long serialVersionUID = 240L;

    private final MonitorAccumModel model;

    private MonitorModel current;

    private boolean drawHealth = true;

    private boolean drawLoad = true;

    private boolean drawMemory = true;

    private boolean drawThread = true;

    private boolean drawYgrid = true;

    private boolean drawXgrid = true;

    /**
     * Needed for Serialization tests.
     * @deprecated Only for use in unit testing
     */
    @Deprecated
    public MonitorGraph() {
        // log.warn("Only for use in unit testing");
        model = null;
    }

    public MonitorGraph(MonitorAccumModel model) {
        this.model = model;
        repaint();
    }

    public void setHealth(boolean health) {
        this.drawHealth = health;
    }

    public void setLoad(boolean load) {
        this.drawLoad = load;
    }

    public void setMem(boolean mem) {
        this.drawMemory = mem;
    }

    public void setThread(boolean thread) {
        this.drawThread = thread;
    }

    /**
     * The method will first check to see if the graph is visible. If it is, it
     * will repaint the graph.
     */
    public void updateGui(final MonitorModel model) {
        if (this.isShowing()) {
            this.current = model;
            repaint();
        }
    }

    /**
     * painComponent is responsible for drawing the actual graph. This is
     * because of how screen works. Tried to use clipping, but I don't
     * understand it well enough to get the desired effect.
     */
    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        if (this.current != null) {
            synchronized (model) {
                List<MonitorModel> samples = model.getAllSamples(this.current.getURL());
                int size = samples.size();
                synchronized (samples) {
                    Iterator<MonitorModel> e;
                    if (size > getWidth()) {
                        e = samples.listIterator(size - getWidth());
                    } else {
                        e = samples.iterator();
                    }
                    MonitorModel last = null;
                    for (int i = 0; e.hasNext(); i++) {
                        MonitorModel s = e.next();
                        if (last == null) {
                            last = s;
                        }
                        drawSample(i, s, g, last);
                        last = s;
                    }
                }
            }
        }
    }

    /**
     * updateGui() will call repaint
     */
    public void updateGui() {
        repaint();
    }

    /**
     * clear will repaint the graph
     */
    public void clearData() {
        paintComponent(getGraphics());
        this.repaint();
    }

    private void drawSample(int x, MonitorModel model, Graphics g, MonitorModel last) {
        double width = getWidth();
        double height = getHeight() - 10.0;
        int xaxis = (int) (width * (x / width));
        int lastx = (int) (width * ((x - 1) / width));

        // draw grid only when x is 1. If we didn't
        // the grid line would draw over the data
        // lines making it look bad.
        if (drawYgrid && x == 1) {
            int q1 = (int) (height * 0.25);
            int q2 = (int) (height * 0.50);
            int q3 = (int) (height * 0.75);
            g.setColor(Color.lightGray);
            g.drawLine(0, q1, getWidth(), q1);
            g.drawLine(0, q2, getWidth(), q2);
            g.drawLine(0, q3, getWidth(), q3);
        }
        if (drawXgrid && x == 1) {
            int x1 = (int) (width * 0.25);
            int x2 = (int) (width * 0.50);
            int x3 = (int) (width * 0.75);
            g.drawLine(x1, 0, x1, getHeight());
            g.drawLine(x2, 0, x2, getHeight());
            g.drawLine(x3, 0, x3, getHeight());
            g.drawLine(getWidth(), 0, getWidth(), getHeight());
        }

        if (drawHealth) {
            int hly = (int) (height - (height * (model.getHealth() / 3.0)));
            int lasty = (int) (height - (height * (last.getHealth() / 3.0)));

            g.setColor(Color.green);
            g.drawLine(lastx, lasty, xaxis, hly);
        }

        if (drawLoad) {
            int ldy = (int) (height - (height * (model.getLoad() / 100.0)));
            int lastldy = (int) (height - (height * (last.getLoad() / 100.0)));

            g.setColor(Color.blue);
            g.drawLine(lastx, lastldy, xaxis, ldy);
        }

        if (drawMemory) {
            int mmy = (int) (height - (height * (model.getMemload() / 100.0)));
            int lastmmy = (int) (height - (height * (last.getMemload() / 100.0)));

            g.setColor(Color.orange);
            g.drawLine(lastx, lastmmy, xaxis, mmy);
        }

        if (drawThread) {
            int thy = (int) (height - (height * (model.getThreadload() / 100.0)));
            int lastthy = (int) (height - (height * (last.getThreadload() / 100.0)));

            g.setColor(Color.red);
            g.drawLine(lastx, lastthy, xaxis, thy);
        }
    }

}