Better way for passing parameters ?
Hi, i'm using a hashmap(string) in my java (parameters/value).
At this time, i m calling Java methods from native code to retrieve value from this hashmap.
I think it would be better to pass all the data to native code, and after retrieve data from C structure.
i dont know what jni structure i should use to pass these datas(jobjectArray, jchararray). I cant pass string to native functions because there are too many parameters.
May you help me.
Thks
If you need extremely robust solution, have a look at NewDirectByteBuffer and GetDirectBufferAddress - native functions to allocate ByteBuffer in native memory which could be accessed from Java or retrive the contents of the ByteBUffer allocated in Java. This is pretty neat, since you are not passing any parameters except for a reference to ByteBuffer which can be read directory from native code.
SUch approach does buy off if you need to pass really huge structures (over 10M?..) since parameters to native code are passed 'by value' (so, EVERYTHING is copied) - if I remember everything correctly - haven't touched JNI for a while.
I did some tests with early 1.4.x JVMs long time ago and the trade off wasn't very obvious in my case (< 2-3M of data passed in and out). So, unless you run in performance bottlenecks or can think of some generic 'protocol' for your application to read/write params from a buffer (thus eliminating/limiting changes to JNI interface every time you need to pass new parameter) i don't think it's worth it.
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I am using XML approach for passing parameters in a query. This is running very slow but when I pass comma separated values in parameter, it runs very fast.
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I have also googled to clear my doubt but not get solution till now. please help me.
Regards,
Sachin914014 wrote:
Hi,
I am using XML approach for passing parameters in a query. This is running very slow but when I pass comma separated values in parameter, it runs very fast.
So it concludes that we should not use XML approach for passing parameters. Please confirm me that Am I right or wrong?
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Regards,
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Cheers, -
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Attachments:
AppendColumns.png 3 KB -
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Hi all,
I had a dispute with a colleague about passing data between different WDP Development Components. The situation is like this:
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or...
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ps: Any answer will be rewarded.Hi Cuneyt,
Refer the links below, they are very informative!
http://help.sap.com/saphelp_nw04s/helpdata/en/22/15a441cd47a209e10000000a155106/content.htm
http://help.sap.com/saphelp_nw04s/helpdata/en/67/cc744176cb127de10000000a155106/content.htm
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Dear All,
I have three Task Flows:
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Question:
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There has to be a better way for Paths & Zooming?
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NetCommercial45 views up to date with no answer... OK I got it.
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Best practice for passing parameters to a Timer event handler?
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Better way for having Auto Expand/Collapse JSplitPane
Hi,
I have a JSplitPane, on the left I have a panel (the main content), and on the right I have another component which is more like a "toolbox". So initially I have the right component invisible, so taht my split pane divider will be all the way to the right, and only the left component is visible. As I move my mouse over the divider I would like to have it "pop" open (or expand)....then when the mouse is moved out of the right component, I would like it to collapse. Make sense so far??
Ok, so I implemented the following:
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public void mouseMoved(MouseEvent e) {
if (collapsed == false) {
preferredDividerLocation = getDividerLocation();
MouseMotionAdapter dividerMotionAdapter = new MouseMotionAdapter() {
public void mouseMoved(MouseEvent e) {
int x = e.getX() + getDivider().getX();
if (getRightComponent().isVisible() == false) {
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// if you move mouse to fast, the event is not caught in time
QoviaLogger.logDebug("x: " + x + ", dX: " + getDivider().getX());
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if (x > getDivider().getX()) {
if (collapsed) {
if (getRightComponent().isVisible() == false) {
getRightComponent().setVisible(true);
if (doneOnce == false) {
setDividerLocation(getLastDividerLocation());
doneOnce = true;
else {
setDividerLocation(preferredDividerLocation);
collapsed = false;
return;
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else {
setDividerLocation(Integer.MAX_VALUE);
collapsed = true;
return;
getDivider().addMouseMotionListener(dividerMotionAdapter);
addMouseMotionListener(paneMotionAdapter);...the problem is, if the user moves the mouse to fast over the divider..the event is not caught...so the split pane wont expand/collapse.
any ideas how to make it better, or perhaps always catch this event??
thanksI tried to show you that mouseExited() would work and ran into the same kind of problems except on a slightly less annoying scale. You should have explained what the problems were. I just assumed that the problem was that you couldn't code it. Here's what I finally had to do.import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.basic.*;
public class Test3 extends JFrame {
JSplitPane jsp = new JSplitPane();
BasicSplitPaneDivider spd = ((BasicSplitPaneUI)jsp.getUI()).getDivider();
Container content = getContentPane();
public Test3() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jsp.setDividerLocation(0);
JPanel jp = new JPanel();
jp.add(new JLabel("Label:"));
jp.add(new JTextField("text"));
jsp.setLeftComponent(jp);
// ((JComponent)jsp.getLeftComponent()).setMinimumSize(new Dimension(0,0));
content.add(jsp, BorderLayout.CENTER);
Component c = getGlassPane();
c.setVisible(true);
c.addMouseMotionListener(new MouseMotionListener() {
public void mouseMoved(MouseEvent me) {
Point p = SwingUtilities.convertPoint((Component)me.getSource(),me.getPoint(),jsp);
int loc = jsp.getDividerLocation();
if (loc<=1) {
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} else {
if (p.x>loc) jsp.setDividerLocation(0);
mousey(me);
public void mouseDragged(MouseEvent me) { mousey(me); }
c.addMouseListener(new MouseListener() {
public void mouseExited(MouseEvent me) {
if (me.getX()<=0) jsp.setDividerLocation(.5);
else jsp.setDividerLocation(0);
mousey(me);
public void mouseClicked(MouseEvent me) { mousey(me); }
public void mouseEntered(MouseEvent me) { mousey(me); }
public void mousePressed(MouseEvent me) { mousey(me); }
public void mouseReleased(MouseEvent me) { mousey(me); }
setSize(200,200);
setVisible(true);
public void mousey(MouseEvent me) {
Point p = SwingUtilities.convertPoint((Component)me.getSource(), me.getPoint(), content);
Component c = content.findComponentAt(p);
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public static void main(String[] args) { new Test3(); }
}
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