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Performance problem loading XML message on a applet in order to display them on a text scroll view.

Posted on 2007-12-04
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Last Modified: 2013-12-29
Hi,
   I got a problem trying to load XML messages from a URL on an Applet update() method. The applet is used to diaply a text scroll; what happes is when the update method is called (because the current messages are about to passed) is freezing the scrolling effect for a sec. Any ideas how I can handle this?

Regards,

Carlos M.  
public synchronized void update(Graphics g) {

		

		int limit = theListOfList.size();

		for (int n = 0;n<limit;n++){ 

		 

			for (Message m : theListOfList.elementAt(n).messages) {

				m.X--;

				

				

				

			}

			if ((theListOfList.elementAt(n).messages.lastElement().X + theListOfList.elementAt(n).messages.lastElement().messageSize)- totalLarge == theListOfList.elementAt(n).totalListBufferSize) {
 

			

				currentListPoss = nextListPoss;

				

				loadMessages(theListOfList.elementAt(n).messages.lastElement().X+ theListOfList.elementAt(n).messages.lastElement().messageSize);

            

			}
 

		}

		
 

		 paint(g);

	}
 
 

This is the loadmessages method:
 

public synchronized void loadMessages(int X) {

		System.out.println(currentListPoss);

		ListOfMessages currentList = new ListOfMessages();

		
 

		try {

			

			DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory

					.newInstance();

			DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();

			Document doc = docBuilder

					.parse("http://65.38.219.91/29960/test/getmessages2.php");

			NodeList listOfitems = doc.getElementsByTagName("item");
 

			for (int s = 1; s < listOfitems.getLength(); s++) {
 

				Node item = listOfitems.item(s);

				receiver.add(item.getTextContent().trim());
 

			}// end of for loop with s var
 

		} catch (SAXParseException err) {

		
 

		} catch (SAXException e) {

			Exception x = e.getException();

			// System.out.println(e);

			((x == null) ? e : x).printStackTrace();
 

		} catch (Throwable t) {

			t.printStackTrace();

			// System.out.println(t);

		}

		
 
 

         int i =0;

		for (String s : receiver) {

			

			Message currentMsg = new Message(s, X);

			

			

			currentList.messages.add(generateImg(currentMsg));

			currentList.totalListSize += currentMsg.messageSize;

			

			X = X + currentMsg.messageSize;

			

			i++;

		}

		currentList.totalListBufferSize = (int) (currentList.totalListSize * 0.30);
 

		theListOfList.add(currentListPoss, currentList);

		if (currentListPoss == messageQueueLimit - 1) {

			nextListPoss = 0;

		} else {

			nextListPoss = currentListPoss + 1;
 

		}
 

	}

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Question by:cmercado_miranda
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3 Comments
 
LVL 92

Expert Comment

by:objects
ID: 20408060
you need to handle the loading of xml in a seperate thread.
0
 

Author Comment

by:cmercado_miranda
ID: 20411413
How can I do that, any example of calling a tread on a applet?
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LVL 92

Accepted Solution

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objects earned 250 total points
ID: 20415858
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