cvs commit: jakarta-log4j/contribs/CekiGulcu AppenderTable.java

[ce...@apache.org]

ceki        02/03/21 06:45:14

  Added:       contribs/CekiGulcu AppenderTable.java
  Log:
  AppenderTable is my attempt to implement a JTable that can
  efficiently handle the insertion of great number of elements.
  On my machine, it takes about 4 seconds to insert a total of
  100'000 elements to the table.
  
  Revision  Changes    Path
  1.1                  jakarta-log4j/contribs/CekiGulcu/AppenderTable.java
  
  Index: AppenderTable.java
  ===================================================================
  /*
   * Copyright (C) The Apache Software Foundation. All rights reserved.
   *
   * This software is published under the terms of the Apache Software
   * License version 1.1, a copy of which has been included with this
   * distribution in the LICENSE.txt file.  */
  
  
  import org.apache.log4j.helpers.CyclicBuffer;
  import org.apache.log4j.Level;
  import org.apache.log4j.Logger;
  import org.apache.log4j.Layout;
  import org.apache.log4j.PatternLayout;
  import org.apache.log4j.spi.LoggingEvent;
  
  import javax.swing.JFrame;
  import javax.swing.JButton;
  import javax.swing.JTable;
  import javax.swing.JTextArea;
  import javax.swing.table.AbstractTableModel;
  import javax.swing.table.TableCellRenderer;
  import javax.swing.JScrollPane;
  import javax.swing.BoxLayout;
  
  import java.awt.Component;
  import java.awt.Dimension;
  import java.awt.event.ActionListener;
  import java.awt.event.ActionEvent;
  import java.awt.Container;
  
  /**
     The AppenderTable illustrates one possible implementation of
     an Table possibly containing a great many number of rows.
  
     <p>In this particular example we use a fixed size buffer
     (CyclicBuffer) although this data structure could be easily
     replaced by dynamically growing one, such as a Vector. The required
     properties of the data structure is 1) support for indexed element
     access 2) support for the insertion of new elements at the end.
  
     <p>Experimentation on my 1400Mhz AMD machine show that it takes
     about 45 micro-seconds to insert an element in the table. This
     number does not depend on the size of the buffer. It takes as much
     (or as little) time to insert one million elements to a buffer of
     size 10 as to a buffer of size 10'000. It takes about 4 seconds to
     insert a totaal of 100'000 elements.
  
     <p>On windows NT the test will run about twice as fast if you give
     the focus to the window that runs "java AppenderTable" and not the
     window that contains the Swing JFrame.  */
  public class AppenderTable extends JTable {
  
  
    static Logger logger = Logger.getLogger(AppenderTable.class);
  
    static public void main(String[] args) {
  
      if(args.length != 2) {
        System.err.println(
        "Usage: java AppenderTable bufferSize runLength\n"
        +"  where bufferSize is the size of the cyclic buffer in the TableModel\n"
        +"  and runLength is the total number of elements to add to the table in\n"
        +"  this test run.");
        return;
      }
  
      JFrame frame = new JFrame("JTableAppennder test");
      Container container = frame.getContentPane();
  
      AppenderTable tableAppender = new AppenderTable();
      
      int bufferSize = Integer.parseInt(args[0]);
      AppenderTableModel model = new AppenderTableModel(bufferSize);
      tableAppender.setModel(model);
  
      int runLength = Integer.parseInt(args[1]);
  
      JScrollPane sp = new JScrollPane(tableAppender);
      sp.setPreferredSize(new Dimension(250, 80));
      
      container.setLayout(new BoxLayout(container, BoxLayout.X_AXIS));
      container.add(sp);
  
      // The "ADD" button is intended for manual testing. It will
      // add one new logging event to the table.
      JButton button = new JButton("ADD");
      container.add(button);
      button.addActionListener(new JTableAddAction(tableAppender));
  
      frame.setSize(new Dimension(500,300));
      frame.setVisible(true);
  
      long before = System.currentTimeMillis();
  
      int i = 0;
      while(i++ < runLength) {      
        LoggingEvent event = new LoggingEvent("x", logger, Level.ERROR, 
  					    "Message "+i, null);
        tableAppender.doAppend(event);
      }
  
      long after = System.currentTimeMillis();
  
      long totalTime = (after-before);
      
      System.out.println("Total time :"+totalTime+ " milliseconds for "+
  		       "runLength insertions.");
      System.out.println("Average time per insertion :"
  		       +(totalTime*1000/runLength)+ " micro-seconds.");
  
  
    }
  
    public
    AppenderTable() {
      this.setDefaultRenderer(Object.class, new Renderer());
    }
  
    /**
       When asked to append we just insert directly into the model. In a
       real appender we would use two buffers one for accumulating
       events and another to accumalte events but after filtering. Only
       the second buffer would be displayed in the table and made
       visible to the user.*/
    public
    void doAppend(LoggingEvent event) {
      ((AppenderTableModel)getModel()).insert(event);
    }
  
    /**
       The Renderer is required to display object in a friendlier from.
       This particular renderer is just a JTextArea.
  
       <p>The important point to note is that we only need *one*
       renderer. */
    class Renderer extends JTextArea implements TableCellRenderer {
  
      PatternLayout layout;
  
      public
      Renderer() {
        layout = new PatternLayout("%r %p %c [%t] -  %m");
      }
  
      public Component getTableCellRendererComponent(JTable table,
  						   Object value,
  						   boolean isSelected,
  						   boolean hasFocus,
  						   int row,
  						   int column) {
  
        // If its a LoggingEvent than format it using our layout.
        if(value instanceof LoggingEvent) {
  	LoggingEvent event = (LoggingEvent) value;
  	String str = layout.format(event);
  	setText(str);
        } else {
  	setText(value.toString());
        }
        return this;
      }
    }
  }
  
  class AppenderTableModel extends AbstractTableModel {
  
    CyclicBuffer cb;
    
    AppenderTableModel(int size) {
      cb = new CyclicBuffer(size);
    }
  
    /**
       Insertion to the model always results in a fireTableDataChanged
       method call. Suprisingly enough this has no crippling impact on
       performance.  */
    public
    void insert(LoggingEvent event) {
      cb.add(event);
      fireTableDataChanged();
    }
  
    /**
       We assume only one column.
    */
    public 
    int getColumnCount() { 
      return 1; 
    }
    
    /**
       The row count is given by the number of elements in the
       buffer. This number is guaranteed to be between 0 and the buffer
       size (inclusive). */
    public int getRowCount() { 
      return cb.length();
    }
    
    /**
       Get the value in a given row and column. We suppose that there is
       only one colemn so we are only concerned with the row.
  
       <p>Interesting enough this method returns an object. This leaves
       the door open for a TableCellRenderer to render the object in
       a variety of ways.
    */
    public 
    Object getValueAt(int row, int col) {
      return cb.get(row);
    }
  }
  
  
  /**
     The JTableAddAction is called when the user clicks on the "ADD"
     button.
  */
  class JTableAddAction implements ActionListener {
      
    AppenderTable appenderTable;
    Logger dummy = Logger.getLogger("x");
    int counter = 0;
    public
    JTableAddAction(AppenderTable appenderTable) {
      this.appenderTable = appenderTable;
    }
      
    public
    void actionPerformed(ActionEvent e) {
      counter++;
      LoggingEvent event = new LoggingEvent("x", dummy, Level.DEBUG, 
  					  "Message "+counter, null);    
      appenderTable.doAppend(event);
    }
  }
  
  
  

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