JMeter example source code file (MonitorHealthVisualizer.java)

This example JMeter source code file (MonitorHealthVisualizer.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, border, connector_prefix_default, connector_prefix_default, event, gui, image, monitoraccummodel, monitoraccummodel, monitorhealthpanel, monitorhealthvisualizer, monitorperformancepanel, monitortabpane, non-nls-1, non-nls-1, override, string, string, swing

The JMeter MonitorHealthVisualizer.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.BorderLayout;
import java.awt.Graphics;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.Image;

import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;

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

import org.apache.jorphan.gui.JLabeledTextField;
import org.apache.jorphan.logging.LoggingManager;
import org.apache.log.Logger;

/**
 * For performance reasons, I am using tabs for the visualizers. Since a
 * visualizer is heavy weight, I don not want to have two separate result
 * collectors rather the same information. Instead, I would rather have the
 * visualizer be the container for the data and simply pass the data to child
 * JComponents. In the future, we may want to add email alerts as a third tab.
 */
public class MonitorHealthVisualizer extends AbstractVisualizer implements ImageVisualizer, ItemListener,
        GraphListener, Clearable {

    private static final long serialVersionUID = 240L;

    private static final Logger log = LoggingManager.getLoggerForClass();

    private static final String CONNECTOR_PREFIX = "connector.prefix"; // $NON-NLS-1$
    private static final String CONNECTOR_PREFIX_DEFAULT = ""; // $NON-NLS-1$

    private static final String BUFFER = "monitor.buffer.size"; // $NON-NLS-1$

    private MonitorTabPane tabPane;

    private MonitorHealthPanel healthPane;

    private MonitorPerformancePanel perfPane;

    private MonitorAccumModel model;

    private MonitorGraph graph;

    private JLabeledTextField prefixField;

    /**
     * Constructor for the GraphVisualizer object.
     */
    public MonitorHealthVisualizer() {
        this.isStats = true;
        initModel();
        init();
    }

    @Override
    public void configure(TestElement el) {
        super.configure(el);
        prefixField.setText(el.getPropertyAsString(CONNECTOR_PREFIX, CONNECTOR_PREFIX_DEFAULT));
        model.setPrefix(prefixField.getText());
    }

    @Override
    public void modifyTestElement(TestElement c) {
        super.modifyTestElement(c);
        c.setProperty(CONNECTOR_PREFIX,prefixField.getText(),CONNECTOR_PREFIX_DEFAULT);
        model.setPrefix(prefixField.getText());
    }

    private void initModel() {
        model = new MonitorAccumModel();
        graph = new MonitorGraph(model);
        model.setBufferSize(JMeterUtils.getPropDefault(BUFFER, 800));
    }

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

    /**
     * Because of the unique requirements of a monitor We have to handle the
     * results differently than normal GUI components. A monitor should be able
     * to run for a very long time without eating up all the memory.
     */
    public void add(SampleResult res) {
        model.addSample(res);
        try {
            collector.recordStats(this.model.getLastSample().cloneMonitorStats());
        } catch (Exception e) {
            // for now just swallow the exception
            log.debug("StatsModel was null", e);
        }
    }

    public Image getImage() {
        Image result = graph.createImage(this.getWidth(), this.getHeight());
        Graphics image = result.getGraphics();
        graph.paintComponent(image);
        return result;
    }

    public void itemStateChanged(ItemEvent e) {
    }

    public synchronized void updateGui() {
        this.repaint();
    }

    public synchronized void updateGui(Sample s) {
        this.repaint();
    }

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

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

        // Add the main panel and the graph
        this.add(this.makeTitlePanel(), BorderLayout.NORTH);
        this.createTabs();
        prefixField = new JLabeledTextField(JMeterUtils.getResString("monitor_label_prefix")); // $NON-NLS-1$
        add(prefixField, BorderLayout.SOUTH);
    }

    private void createTabs() {
        tabPane = new MonitorTabPane();
        createHealthPane(tabPane);
        createPerformancePane(tabPane);
        this.add(tabPane, BorderLayout.CENTER);
    }

    /**
     * Create the JPanel
     *
     * @param pane
     */
    private void createHealthPane(MonitorTabPane pane) {
        healthPane = new MonitorHealthPanel(model);
        pane.addTab(JMeterUtils.getResString("monitor_health_tab_title"), healthPane); // $NON-NLS-1$
    }

    /**
     * Create the JSplitPane for the performance history
     *
     * @param pane
     */
    private void createPerformancePane(MonitorTabPane pane) {
        perfPane = new MonitorPerformancePanel(model, graph);
        pane.addTab(JMeterUtils.getResString("monitor_performance_tab_title"), perfPane); // $NON-NLS-1$
    }

    /**
     * Clears the MonitorAccumModel.
     */
    public void clearData() {
        this.model.clearData();
        this.healthPane.clearData();
        this.perfPane.clearData();
    }

}