Tip

Dynamic mail file size & quota indicator applet

The applet explained below best describes one of the many advantages , and in fact only way(not using agents etc), of java in Lotus Domino.

About the Applet : It displays a progress bar with the current mail file size & quota (if set), and % used.(updated every 10000 Millisecs). Thus giving the user an indication about their mail file usage.

Logic : The applet starts a Thread as soon as it loads and establishes a session with domino. The Thread runs in a infinite loop .ie.,thread sleeps for 10000 millisecs and then fetches the db size, quota and calculates % used. If their is a change in these parameters, the repaint() method of the applet is called to update the progress bar.

How to use : Compile the program (with the right classpath set), create an applet resource. Insert the applet in a form. Set its height ,width to 100 pixels and 30 pixels resp. Create a field near to the applet and find your mail quota and set to this field using postopen method. Ensure Enable java applets is selected in the user preferences.

Applicability : We have customized the welcome page for our organisation and my applet has taken up a corner of it(occupies very little space). So it can be used in the welcome page, mail frameset ,portals etc.

Restriction: Works fine in client. It can be further modified to work on web also (CORBA).


 import java.applet.Applet; import java.awt.Graphics; import java.awt.Color; import java.awt.Font; import lotus.domino.Session; import lotus.domino.DbDirectory; import lotus.domino.Database; import lotus.domino.AppletBase; import lotus.domino.NotesThread;

public class Simple extends AppletBase implements Runnable

{

 private Session session=null; private DbDirectory dbDir=null; private Database mailDb=null; private double quota=0.0,prevQuota=0.0; private double fileSize=0.0,prevFileSize=0.0; private Thread listener=null; private int usedVal=0;
 public void notesAppletInit() { try { NotesThread.sinitThread(); session = this.getSession(); dbDir = session.getDbDirectory(null); mailDb = dbDir.openMailDatabase(); setBackground(new Color(239,239,239)); if(mailDb!=null) { quota = mailDb.getSizeQuota(); if(quota<=0) { repaint(); } else { listener = new Thread(this); listener.start(); } } } catch(Exception e) { System.out.println("Notes Applet Start Exception " + e); } finally { NotesThread.stermThread(); } } public void run() { try { NotesThread.sinitThread(); while(true) { if(mailDb!=null) { quota = mailDb.getSizeQuota(); fileSize = mailDb.getSize(); } if(quota!=0.0 && fileSize!=0.0) { quota = quota/1024; fileSize = fileSize/(1024*1024); usedVal = (int) Math.floor((fileSize/quota)*100); if(quota!=prevQuota || fileSize!=prevFileSize) { prevQuota = quota; prevFileSize = fileSize; repaint(); } listener.sleep(10000); } } } catch(Exception e) { System.out.println("Run Exception " + e); } finally { listener=null; NotesThread.stermThread(); } } public void paint(Graphics g) { try { NotesThread.sinitThread(); if(quota<=0) { g.drawString("Mail quota is not set",1,15); } else { g.setColor(new Color(11,148,212)); g.fill3DRect(0,0,usedVal,30,true); g.setColor(Color.black); g.setFont(new Font("Arial",Font.PLAIN,9)); if(usedVal<=15) { g.drawString(Math.ceil(fileSize)+" mb",10,12); g.drawString(usedVal +" %",10,28); } else if(usedVal>=85) { g.drawString(usedVal +" %",75,28); g.drawString(Math.ceil(fileSize)+" mb",60,12); } else { g.drawString(usedVal +" %",usedVal-12,28); g.drawString(Math.ceil(fileSize)+" mb",usedVal-12,12); } } } catch(Exception e) { System.out.println("Paint Exception " + e); } finally { NotesThread.stermThread(); } } public void notesAppletDestroy() { try { session = null; dbDir = null; mailDb = null; } catch(Exception e) { System.out.println("Destroy Exception " + e); } } }

This was first published in August 2002

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